Texas Instruments nSpire CX CAS Graphing Calculator User Manual
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Using the TI nSpire CX CAS Handheld (www.mathguy.us) Prepared by: Earl L. Whitney, FSA, MAAA Version 2.1 October 2, 2016 2 Using the TI nSpire CX CAS Handheld Table of Contents Chapter Description Page External Links 3 1 Introduction 4 2 Documents 6 3 Calculator Application 10 Menu Items 13 4 Variables and Functions 16 5 Graphs Application 17 Menu Items 21 6 Calculus 24 7 Notes Application 29 8 Lists & Spreadsheet Application 31 9 Probability 36 Statistics 39 10 Menu Items 43 11 Connectivity 45 12 Programming 47 Appendix A Keyboard Shortcuts 55 Appendix B Some Keyboard Commands 56 Appendix C Special Projects 61 Solids of Revolution about the ‐axis 61 Connect a Geometry Item to a Curve 62 Volume by Cross Section 63 Index of Hyperlinks to Key Items 64 Appendix D To move to a chapter, [ctrl] click on the Chapter Description above. Note: this works only in the Microsoft Word version of this document. Using the TI nSpire CX CAS Handheld October 2, 2016 3 External Links nSpire CX CAS manual is available at: https://education.ti.com/en/us/guidebook/details/en/502A552F7D6E4756A75BD8482FEB0E26/gettings
tartedwiththeti‐nspirecxhandheld. This document is TI’s guide to using the nSpire CX CAS. nSpire CX CAS Reference Guide is available at: https://education.ti.com/en/us/guidebook/details/en/3F30BA6FDA6F49608C44BB4B5F3746FA
/ti‐nspirecasreferenceguide‐2. This document provides a list of keyboard functions available for use with the nSpire. It can be very useful. TI Computer Link Software is available at: https://education.ti.com/en/us/software/details/en/82035809F7E6474099944056CCB01C20/ti
‐nspire_computerlink. This free software will allow you to connect your nSpire handheld to your computer. It allows you to perform a limited number of tasks on the nSpire from a PC or Mac. It is not needed if you have the Teacher or Student Software. TI Teacher Software and TI Student Software are available at: https://education.ti.com/en/us/products/computer_software/ti‐nspire‐software/ti‐nspire‐and‐
ti‐nspire‐cas‐teacher‐software/tabs/overview. This software is useful for teachers and for making presentations about the nSpire CX CAS. However, it is not free and is not necessary for students. You may want to try the 30‐day trial to see if you find it useful before purchasing it. TI nSpire tutorials are available at:
https://www.atomiclearning.com/ti_nspire
https://education.ti.com/en/timathnspired/us/resource/video‐tutorials TI nSpire lessons (.tns files – require Teacher or Student software) are available at:
http://www.ticalc.org/pub/nspire/basic/math/
https://sites.google.com/site/tinspiregroup/assignments
https://education.ti.com/en/timathnspired/us/home [ctrl] click on any of the hyperlinks above to go directly to the associated website. Note: this works only in the Microsoft Word version of this document. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 4 Chapter 1: Introduction Context Menus:
[ctrl] → [menu] – opens a context menu that acts like a right click on a PC. Moving through dialog boxes: [tab] – moves to the next box. [shift] → [tab] – moves (backward) to the previous box. Note: click and double‐click with this key. Shift Lock: [ctrl] → [shift]. You must be in a document in order to use certain nSpire capabilities (e.g., hide graph, construct tangent line). To save Scratchpad work to a document:
[doc] → File (1) → Save (4) → [enter]. Document Settings: [home] → Settings (5). * Graph Settings: Enter the graph portion of the Scratchpad . Then, [menu] → Settings (8). * * Click Make Default after changing settings. Grab something on the screen (so you can move it): [ctrl] → click to grab. [enter] when done moving the item. When working on problems, consider working inside a document so that various applications can be linked, functions defined, etc. Work in a document can also be saved for later. Special keys: Space bar: . Underscore: [ctrl] → . Backslash (\): [shift] → . TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 5 Adjusting Screen Brightness
Press and hold the [ctrl] key.
Press the key to increase brightness, or the key to decrease brightness. Screen Icons (top of screen) A
A. Page scrolling arrows B
B. Problem.Page tabs C
D E F G H I
C. Document name D. Press‐to‐Test indicator (not shown) – see note below. E. Wireless network login indicator (not shown) F. [shift], [ctrl], or [CAPS] status G. Radians or Degrees indicator H. Battery indicator I. Close document button Note: Press‐to‐Test mode disables access to pre‐existing documents and scratchpad entries. It can be used, for example, in standardized testing to prevent students from loading the nSpire with information to use on the test. TI discusses the use of Press‐to‐Test mode on its website at: https://education.ti.com/en‐
GB/uk/products/ti‐nspire/ti‐nspire‐cx‐handheld/exam‐acceptance/press‐to‐test. Press‐to‐
Test mode is easy to get into, but a pain in the neck to get out of. On‐Screen Help
Press [ctrl] → to get help on‐screen. This is occasionally, but not always, useful. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 6 Chapter 2: Documents Create a new document [home] → New Document (1) [ctrl] → I – Insert a page within a problem in a document. Work with existing files and folders [home] → My Documents (2) File/folder manipulation (inside My Documents: [home] → 2) To delete a file or folder: [menu] → New Folder (1) – create a new folder. [ctrl] → [menu] → Delete (6)
[menu] → Rename (2) – rename a file or folder. [menu] → Save As (3) – save a file with a different name. [menu] → Open (4) – open a file. Shortcut: [ctrl] → O [menu] → Close (5) – close a file. Shortcut: [ctrl] → W [menu] → Send (6) – transfer a file or folder to another nSpire or a PC. Finished working with existing files and folders [home] Documents menu: from inside a document: [doc] File (1) – New, Open, Close, Save, Save As, Send Edit (2) – Undo, Redo, Cut, Copy, Paste, Delete, Color View (3) – Move forward or backward a page, or enter the “Page Sorter” overview Insert (4) – Problem, Page (shortcut: [ctrl] → I), Applications, Program Editor Page Layout (5) – Split Screen o Custom Split (1) o Select Layout (2) – select one of eight layouts (see “Page Layouts” below) o Select App (3) – select an app to use in a new pane; same as [menu] o Swap Applications (4) – swap the panes in which applications reside o Delete Application (5) – deletes the pane containing the selected application o Delete Page (6) o Group (7) – groups together existing pages onto a single page o Ungroup (8) – splits apps on a single page to separate pages TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 7 Keyboard Shortcut Summary for Documents [ctrl] → N – New document [ctrl] → O – Open document [ctrl] → W – Close document [ctrl] → S – Save document [ctrl] → I – Insert a page [ctrl] → Y – Redo Saving a File [ctrl] → S. To change location, [shift] → [tab] [doc] → File(1) → Save (4) or Save As (5)
[ctrl] → X – Cut [ctrl] → C – Copy [ctrl] → V – Paste [ctrl] → Z – Undo [ctrl] → [esc] – Undo Seven Core Apps Calculator (also on Scratchpad) Graph (also on Scratchpad) Geometry – coordinate and non‐coordinate Lists and Spreadsheet – like Microsoft Excel; good for statistical applications Data and Statistics Notes – useful for adding comments to documents Vernier DataQuest – used with probes (e.g., CBR2 motion detector) to collect real world data. Inside a Document A document can have up to 30 problems; a problem can have up to 50 pages. Add a problem to an existing document: o [doc] → Insert (4) → Problem (1) o Select the type of page you want to insert into the new problem [ctrl] → I – Insert a page within a problem in a document. Page numbering inside a document (see tabs at the top) [a.b]: o a is the problem number. o b is the page number within that problem. [ctrl] or [ctrl] – Move left and right (or use mouse) from page to page. [ctrl] – gives overview of whole document (Page Sorter View). Variables are defined at the problem level, and exist throughout all pages of a problem. Documents do not interact with the Scratchpad. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 8 Page Views
Full Page View o Shows a single page. o Can have up to four apps on one page. o [ctrl] → [tab] moves clockwise from app to app on a page (or use mouse)
Page Sorter View: [ctrl] o Can see all problems and pages within a document. o To go to a page, highlight the page and press [enter]. o To move a page from one location to another. Highlight the page you want to move. [ctrl] → click – to grab the page. Move to the location where you want the page to be using the arrow keys on the touchpad. Press [enter] to drop the page in place.
My Documents View – goes to file tree: [ctrl] → [ctrl] Working with Problems and Pages in Page Sorter View ( [ctrl] )
Collapse or expand all problems (see only problem numbers and names): o [menu] → Expand All (1) or Collapse All (2) Collapse or expand a single problem: o [ctrl] → [menu] → Expand All (1) or Collapse All (2) Name or rename a problem. Problems are named with numbers by default. To name it something meaningful, select the problem, then press: o [menu] → Rename (5) → type name → [enter] Page Sorter View with Problems Add a problem to an existing document: [menu] → Insert 1 and 3 named. Problem 3 is selected and expanded.
Problem (6) Add a page to an existing problem: [menu] → Insert Page (7) Move a problem: Select the problem, then press: o [ctrl] → [menu] → Cut (2) or Copy (3) → [Enter] o Move to the new location, then press: [ctrl] → [menu] → Paste (4) Delete a problem: Select the problem, then: o [ctrl] → [menu] → Delete (5) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 9 Page Layout Options
[doc] → Page Layout (5) → Select Layout (2) – select one of the following: Layout 1 Layout 2 Layout 3 Layout 4 Layout 5 Layout 6 Layout 7 Layout 8
[doc] → Page Layout (5) → Custom (1) – to change where the page splits occur. [ctrl] → [tab] – to move from pane to pane (in a clockwise direction) [menu] – to select the application to add to a pane To combine consecutive pages: from the first of two pages to be combined, [doc] → Page Layout (5) → Group (7) To split an application on a page to a separate page: [doc] → Page Layout (5) → Ungroup (8) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 10 Chapter 3: Calculator Application Fraction Template: [ctrl] → brings up the template. Change number of digits showing on the screen: From Home Screen, Settings (5) → Document Settings (2). Recommended: click on [Make Default] after changes. Note: values are not rounded in memory, just on the screen. Logarithm Template: [ctrl] → brings up the template. Clear scratchpad history [ctrl] → [menu] → Clear History (1). [menu] → Actions (1) → Clear History (5). To undo the clearing (i.e., bring it all back): [ctrl] → [esc]. Clear current line
[ctrl] → Variable “ans” The variable ans contains the last answer obtained by pressing [enter]. It can be used in any expression by typing ans. ]. Notice ans on the keypad above . It can also be accessed with [ctrl] → [
Successive presses of [enter] perform the same operation on each new ans variable. Copy, Paste, Edit Highlight the desired item, then: Copy: [ctrl] → C Paste: [ctrl] → V To copy only a portion of the highlighted item: o Position the cursor at one end of what you want to copy. o Hold [shift] and use the arrow keys to move to the other end of what you want to copy. o [ctrl] → C to copy the selection. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 11 Convert exact answer to decimal [ctrl] → [enter] instead of [enter]. [menu] → Number (2) → Convert to Decimal (1). Command: approx(___). Catalog ( key) – on the right side of the nSpire, under the [del] key Category 1 contains the entire catalog. Jumping around in the list: o Press a letter to jump to commands starting with that letter. o [ctrl] → 1 to obtain the last item in the catalog (like a PC’s “end” key). o [ctrl] → 3 to page down. o [ctrl] → 7 to obtain the first item in the catalog (like a PC’s “home” key). o [ctrl] → 9 to page up. Syntax of a command is shown at the bottom of the screen. o To expand the syntax, press [tab] → [enter]. Wizards A wizard is a user interface o Press [tab] multiple times to highlight Wizards. with dialog boxes that help o Press [enter] to turn the wizard on. you complete a complex o Press [tab] again to move on. task more easily. Expression Template: Contains templates for integrals, derivatives, limits, matrices, roots, logarithms, etc. Symbol Palette: [ctrl] →
Contains symbols that can be used: , , , ∞, , , , , ,arrows, Greek letters, statistical symbols, currency signs, set notation, mathematical shorthand, etc.
… and a lot more symbols – 544 in total. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 12 π Template (bottom left of nSpire) ?! Template (bottom right of nSpire) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 13 Menu Items in the Calculator (and sub‐menus) Actions: [menu] → 1
Define (1) – define a variable (use equal sign “=”, not “:=” in the definition) Recall Definition (2) Delete Variable (3) Calculator [Menu]
Clear a‐z (4) 1 Actions Clear History (5) 2 Number Insert Comment (6) 3 Algebra Library (7) 4 Calculus Lock (8) – locks and unlocks variables. 5 Probability 6 Statistics Number: [menu] → 2 7 Matrix & Vector Convert to Decimal (1) 8 Finance Approximate to Fraction (2) Factor (3) Least Common Multiple (4) Greatest Common Divisor (5) Remainder (6) Fraction Tools (7) Number Tools (8) Complex Number Tools (9) Algebra: [menu] → 3
Solve (1) – solve(equation, variable). Factor (2) – factor(expression). Also converts trig expressions. Expand (3) – expand(expression). Provides the partial fraction expansion of a rational expression. Zeros (4) – zeros(expression, variable). Complete the Square (5) Numerical Solve (6) – nSolve(equation, variable). Solve System of Equations (7) Polynomial Tools (8) Fraction Tools (9) Convert Expression (A) Trigonometry (B) Complex (C) TOC Extract (D) Using the TI nSpire CX CAS Handheld Hyper October 2, 2016 14 Calculus: [menu] → 4
Derivative (1) Items 1 to 6 in the Calculus Derivative at a Point (2) menu provide templates to fill in to obtain a solution. Integral (3) Limit (4) Sum (5) Product (6) Within a Function Minimum (7) – fmin(expression, x[, lowBound, upBound]) function definition, Function Maximum (8) – fmax(expression, x[, lowBound, upBound]) items in Tangent Line (9) – tangentLine(expression, x, value) [brackets] Normal Line (A) – normalLine(expression, x, value) are optional.
Arc Length (B) – arcLen(expression, x, start, end) Series (C) – options are: Taylor Polynomial (1), Generalized Series, (2), Dominant Term (3) Differential Equation Solver (D) – deSolve(ODE, Var, depVar) – 1st or 2nd order only. 2
, , ) Note: access ‘ via the “π” key. o Example: deSolve(
Implicit Differentiation (E) – impDif(expression, x, y) Numerical Calculations (F) – Numerical integration, etc. Probability: [menu] → 5
Factorial (1) – can also calculate factorials with “!” in the symbol palette (4th row) Permutations (2) Combinations (3) Random (4) – everything to do with random numbers Distributions (5) – Normal, Student’s t, , F, Binomial, Geometric, Poisson Statistics: [menu] → 6
Ties into the “Lists & Spreadsheet” app Stat Calculations (1) – 1‐variable, 2‐variable, various regressions Stat Results (2) List Math (3) – mean, median, max, min, population and sample SD and Variance List Operations (4) – sort, fill, sequence, conversion to/from List or Matrix Distributions (5) – Normal, Student’s t, , F, Binomial, Geometric, Poisson Confidence Intervals (6) Stat Tests (7) – Hypothesis testing, regression, ANOVA Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 15 Matrix & Vector: [menu] → 7
Create variable size matrix – (middle element on 2nd row)
Create (1) – Matrix, Zero Matrix, Identity, Diagonal, Random Matrix, Fill, Submatrix, Augment, Column Augment, Construct Matrix Transpose (2) Determinant (3) Row‐Echelon Form (4) Reduced Row‐Echelon Form (5) Simultaneous (6) Norms (7) Dimensions (8) Row Operations (9) Element Operations (A) Advanced (B) – Trace, decomposition, Eigenvalues, Eigenvectors, Characteristic Polynomial. Vector (C) – Unit vector, dot product, cross product, convert to other coordinate systems.
Finance: [menu] → 8
Finance Solver (1) – n, i, PV, Pmt, FV, PpY TVM Functions (2) – (time value of money) n, i, PV, Pmt, FV Amortization (3) Cash Flows (4) Interest Conversion (5) Days between Dates (6) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 16 Chapter 4: Variables and Functions General Variable and function names can be 1‐16 Note: the underline character is: characters long (letters, digits, underlines). [ctrl] → Variables can be defined using other variables. Functions can be defined using other functions and variables. Stored functions can be graphed in the Graph App. The independent variable, when graphing, must be . [var] brings up the list of existing variables and functions. Defining a variable or function Method 1: Type the expression to be saved. Then, [ctrl] → [store] → name o Example: 1/x → [ctrl] → [store] → recip(x) [enter] creates a function recip(x) that returns the value 1/x. Method 2: name → [: ] → expression. Multiple variables/functions can be defined if separated by a colon. o Example: num1:=10:num2:=20 (no spaces). Method 3: Especially good for defining functions. o [menu] → Actions (1) → Define (1) or type “define” o function name (variable list) expression → [enter] (no spaces) o Example: define x_squared(x) x^2 [enter] creates a function x_squared(x) that returns the value . Deleting a variable or function DelVar name1, name2, etc. or [menu] → Actions (1) → Delete Variable (3) → name Choosing from a list of variables/functions [var] brings up a list of existing variables and functions to choose from. Useful in many circumstances, especially if you have long variable/function names that you do not want to retype or if you forget what you named a variable/function. Lock or unlock a variable or function Lock name – locks the variable or function so that it cannot be changed. Unlock name – unlocks the variable or function so that it can be changed. Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 17 Chapter 5: Graphs Application Add a function to a graph (also toggles the equation entry line) [ctrl] → G Note: you can save your scratchpad work in a document as follows: [doc] → File (1) → Save (4) → [enter]. Alternative method (especially for Conics, Parametric or Polar) [menu] → Graph Entry/Edit (3) → o Function (1) o Relation (2) – for equations of the form: o Equation Templates (3) – for conics o Parametric (4) – for parametric equations o Polar (5) – for polar equations o Diff Eq (8) – for slope fields of differential equations Edit the function Mouse over the curve or the label showing the equation. Double‐click on it. Hide a function on the current graph (must be in a document, not Scratchpad). Mouse over the function and press [enter] to select the function. [ctrl] → [menu] → Hide (4) Show a hidden function on the current graph (must be in a document, not Scratchpad). [menu] → Actions (1) → Hide/Show (3). Then, mouse over the curve and click on it. Delete a function and remove it from the current graph Mouse over the function and press [enter] key to select the function. Press the [del] key or [ctrl] → [menu] → Delete (4 or 5) – the number to use depends on whether or not you are in a document. Delete all functions on a graph [menu] → Actions (1) → Delete all (5 or 6) – the number to use depends on whether or not you are in a document. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 18 Linking a function and a graph on separate pages within a problem The pages must be in the same problem within a document On a Calculator Page or Notes Page, define the function. [ctrl] → I → Graphs (2) – to open a Graphs page. [ctrl] → G – to open the equation entry line. [var] – to select a function to graph. Enter as the independent variable. [enter] – to graph the function. Modify the view Zoom: Hover the mouse over one of the axes. [ctrl] → click to grab the axis. Use the arrow keys or move the cursor to expand or compress the axes. Then, press [enter]. Reposition Graph: Hover the mouse over a blank portion of the graph (i.e., in the background). [ctrl] → click to grab the graph. Use the arrow keys or move the cursor to reposition the graph. Then, press [enter]. Resize page split when showing multiple displays on a page: [doc] → Page Layout (5) → Custom (1). Then, use the arrow keys to change the page split. Then, press [enter]. Create and use a slider [ctrl] → G. Enter an equation containing parameters, then press [enter]. Enter any slider settings for variables that you wish to allow to vary in the graph. Note: this may not work in parametric equation mode; use the alternative below. Adjust slider settings: Click on the slider box, then: [ctrl] → [menu] → Settings (1). This allows changing all settings including Minimize. Click on Minimize. o Note: Minimize is very useful because it makes for a cleaner looking graph. Alternative: o On a blank Graphs page, [menu] → Actions (1) → Insert Slider (B) o Enter the variable name (i.e., parameter name), the range, step size and whether the slider is horizontal or vertical. Click Minimized to get a cleaner slider. Then, click OK. o Repeat for any other parameters desired. o Define a function containing the parameters: [ctrl] → G. o Move the slider to see the effect of changing the value of a parameter. To animate a slider: Click on the slider box, then: [ctrl] → [menu] → Animate (4). To stop the slider animation, [ctrl] → [esc] or [ctrl] → [menu] → Stop Animate (4) (this is a toggle for animation). To delete a slider: Click on the slider, then press [del]. Note: when using a slider, any parameters you create become variables; TOC you may need to delete these after you are done with the exercise. Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 19 Graph a 3D Function (inside a document only) On a Graphs page, [menu] → View (2) → 3D Graphing (3). Enter an equation o 3D equation in the form , : just type the equation using and . o 3D Parametric Function: [menu] → 3D Graph Entry/Edit (3) → Parametric (2). Rotate the 3D graph o Manual: use the touchpad keys (, , , ). o Auto: mouse not on the graph; then a or [ctrl] → [menu] → Auto Rotation (4). o Stop automatic rotation: [esc] or r. Change view o [menu] → Range/Zoom (4). Change range, aspect ratio, zoom, orientation. o (multiplication) to zoom in – for 3D graphs only. o
(division) to zoom out – for 3D graphs only. Hide (or Show) 3D box: [menu] → View (2) → Hide (or Show) Box (4). This is a toggle, so you can hide or show the hidden 3D box with the same commands. Orientation o , or – to orient along the corresponding axis. o – to switch to the default orientation. Add the plane “
0” to the plot: [menu] → Trace (5)→ z Trace (1). Context menu: Mouse on surface of plot until it grays out, then: [ctrl] → [menu] → … o Change attributes: Attributes (3) o Delete graph of function: Delete (5) o Edit the equation: Edit Relation (6) o Change color: Color (8) Go back to 2D graphing: [menu] → View (2) → Graphing (1) Graph a Piecewise Function Allows you to define a function over one or more intervals. Very useful if you want to graph a function over only one interval.
On Graphs page –
Example: piecewise function for a single interval: o In the template, indicate that you want only piece [enter]. o On the function entry line, ,
o In this example, must have been previously defined, e.g., on another page. o Notice there is no right brace, ”}”. This is how the nSpire shows the piecewise function. If you try to enter ”}”, you get “{ }“, so don’t. (8th element on top row) → [enter]. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 20 Graph a Conic On a Graphs page, [menu] → Graph Entry/Edit (3) → Equation Templates (3) – select the conic you want to graph. o Parabola (2), Circle (3), Ellipse (4), Hyperbola (5) 0 o Conic (6) – General conic equation Enter values in the template, careful to note the syntax required. [enter] to graph. o Note: depending on the parameters of the conic, you may need to alter the window size: [menu] → Window/Zoom (4) → Zoom – Out (4) Move the equation to a better location. o Hover the cursor over the equation. o [ctrl] → [click] to grab the equation. o Move the equation with the cursor or with the arrow keys. o [enter] to leave it where you have taken it. To analyze the conic o [menu] → Analyze Graph (6) → Analyze Conics (9) o Select the item you want to show on the graph. o Hover the mouse over, and click on, the graph you want to show this item for. o You may need to move any labels that appear. Follow the grab‐and‐move instructions above (hover over, [ctrl], click, move with arrows or mouse). Graph a function of the form [ctrl] → G → [del] → Relation (6). Enter the equation and press [enter]. Example: [ctrl] → G → [del] → Relation (6) → → [enter] – to graph a vertical line at , where is defined elsewhere as a constant or as a variable. Graph Inequalities [ctrl] → G → [del]. Select the desired inequality sign and press [enter]. Repeat to graph multiple inequalities. Graph a Parametric Function [menu] → Graph Entry/Edit (3) → Parametric (4) Independent variable is . Graph a Polar Equation [menu] → Graph Entry/Edit (3) → Polar (5) Independent variable is . TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 21 Menu Items on a Graphs page (and sub‐menus) – will differ on the Scratchpad Actions: [menu] → 1
Pointer (1) Graphing [Menu]
Select (2) – Region, Image, Grid. 1 Actions Hide/Show (3) 2 View Attributes (4) – line thickness, style (dotted, dashed, solid), 3 Graph Entry/Edit label style, continuous vs. discrete. 4 Window/Zoom Set Conditions (5) 5 Trace Delete All (6) 6 Analyze Graph Text (7) – to insert a text box on the graph 7 Table Coordinates and Equations (8) 8 Settings Calculate (9) Redefine (A) Insert Slider (B) To change color, highlight a curve on the graph, then [ctrl] → [menu] → Color (B) View: [menu] → 2
Graphing (1) Plane Geometry (2) 3D Graphing (3) Hide Analytic Window (4) Hide Axes (5) Grid (6) – No grid, Dot Grid, Lined Grid. Show Entry Line (7) – Also [ctrl] → G. Hide Axes End Values (8) Hide Object Selection Guides (9) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 22 Graph Entry/Edit: [menu] → 3
Function (1) Relation (2) Equation Templates (3) – Line, Parabola, Circle, Ellipse, Hyperbola, Conic (general equation). Parametric (4) – define: , and a range for the parameter . Polar (5) – define: Scatter Plot (6) Sequence (7) – Sequence, Custom. Diff Eq (8) Window/Zoom: [menu] → 4
Window Settings (1) – set and mins, maxes, and scale Zoom – Box (2) – use the mouse to define the view box Zoom – In (3) – define the center of the graph with the mouse and zoom in Zoom – Out (4) – define the center of the graph with the mouse and zoom out Zoom – Standard (5) – default setting Zoom – Quadrant 1 (6) – set the axes to emphasize Q1 Zoom – User (7) – saves the current window settings (allows you to go back to these after trying other zoom options – alternative is to undo till you get what you want) Zoom – Trig (8) – automatically sets xMin and xMax to multiples of π. Zoom – Data (9) – sets the axes so all of your data points are visible Zoom – Fit (A) – sets the ‐axis so that all minima and maxima are visible within the current range of ‐values. May need to modify xMin and xMax before using this. Zoom – Square (B) – sets the axes so that tick marks on the x‐ and y‐axes are equal size Zoom – Decimal (C) – sets the axes scales to 0.1 and assures that maxima and minima are shown within the current range of ‐values. Trace: [menu] → 5
Graph Trace (1) – will identify maxima, minima and zeros as you move along the curve. Enter a number to move the trace to that ‐value. Trace All (2) – traces multiple functions simultaneously. Enter a number to move the trace to that ‐value. Trace Step (3) Geometry Trace (4) Erase Geometry Trace (5) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 23 Analyze Graph: [menu] → 6
Zero (1) Minimum (2) Maximum (3) Intersection (4) Inflection (5) dy/dx (6) Integral (7) Bounded Area (8) Analyze Conics (9) – Center, Vertices, Foci, Axes of Symmetry, Directrix, Asymptotes, Radius, Eccentricity, Latus Rectum Table: [menu] → 7
Split‐screen Table (1) – Also [ctrl] → T. Splits the screen and adds table of values. Remove Table (2) – Also [ctrl] → T. Geometry: [menu] → 8 (available only in a document)
Points and Lines (1) – Point, Point On, Intersecting Points, Line, Segment, Ray, Tangent, Vector, Circle Arc Shapes (2) Measurement (3) Construction (4) Transformation (5) “Float” shows “Fix” shows digits significant digits after the decimal Settings: [menu] → 8 or 9
Display Digits – Auto, Float (0‐12), Fix (0‐12). Graphing Angle – typically radians Geometry Angle – typically degrees Automatically hide plot labels Show axes end values Show tool tips for function manipulation Automatically find points of interest Force geometric triangle angles to integers Automatically label points Restore, Make Default, Cancel at bottom of screen. Using the TI nSpire CX CAS Handheld A setting for the AP Exam would be “Fix 3” Note: After defining your settings for graphs, it is a good idea to click on Make Default, so that your settings are applied to all of your graphs. TOC Hyper October 2, 2016 24 Chapter 6: Calculus Define a function and its derivative On a calculator page: f(x):=expression g(x):= → [shift] → – will bring up the derivative template. places you in the “exponent” of the derivative, allowing you to select the ‐th derivative of a function. Alternatively, press and highlight the appropriate derivative template. o Example: Type: f(x):=sin(x) [enter]. o Type: g(x):= → [shift] → – → → 2 to indicate you want a second derivative. o Type after in the denominator, and type f(x) in the parentheses after . o Press [enter]. This will make g(x) the second derivative of f(x). o Note: If you subsequently change the definition of f(x), then g(x) will change to be the second derivative of the new f(x). Graph a derivative , which is the way to type On a Graphs page, graph a function, e.g., the function 3 sin into the nSpire. [ctrl] → G → . Highlight the derivative template: . Fill in the template. [Enter]. Enter in the denominator of the template and to the right of the equal sign. o Note: if your function is not f1, enter whatever the name of your function is. o You can also bring up a list of functions with [var]. Change the attributes of the curve, if desired. o Hover the mouse over the curve to be modified. o [ctrl] → [menu] → Attributes (3). Graph an anti‐derivative , which is 3 sin . On a Graphs page, graph a function, e.g., f1
3 sin
[ctrl] → G → . Highlight the definite integral template: . Fill in the template as follows: o Make the lower limit . o Make the upper limit . o Make the integrand . o Make the _ variable . o Press [Enter]. It may take a little time for the nSpire to graph the antiderivative, so be TOC patient. Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 25 Construct a Tangent Line on a Graph (must be in a document, not Scratchpad)
On a Graphs page, graph a function. [menu] → Geometry (8) → Points & Lines (1) → Tangent (7) Mouse over the curve at the location where you want the tangent line. Then, either click twice or press [enter]. You can move the tangent line like a Trace. The equation of the tangent line will be shown on the graph. You can grab the arrows of the tangent line to extend them. Equation of a Tangent Line (on a calculator page) tangentLine(expression, var=value) – returns the equation of the line tangent to expression at var value. , ,
o tangentLine
⇒ ∙
Construct a Normal Line on a Graph (must be in a document, not Scratchpad) On a Graphs page, graph a function. [menu] → Geometry (8) → Points & Lines (1) → Tangent (7) Mouse over the curve at the location where you want the normal line, and construct a tangent line. [menu] → Geometry (8) → Construction (4) → Perpendicular (1) Mouse to the point of tangency on the tangent line. Then, either click twice or press [enter]. You can move the tangent line like a Trace; as you do, the normal line will move as well. Equation of a Normal Line (on a calculator page) normalLine(expression, var=value) – returns the equation of the line normal to expression at var value. o normalLine
, ,
⇒ TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 26 Find all points of intersection of two curves Graph two curves on a Graphs page. [menu] → Geometry (8) → Points and Lines (1) → Intersection Points (3) Click on each of the two curves. The intersection points will then be labeled on the graph. Find a single point of intersection of two curves Graph two curves on a Graphs page. [menu] → Analyze Graph (6) → Intersection (4) Click on the lower bound. Move right and click on the upper bound. The intersection point will then be labeled on the graph. Area between two curves (find points of intersection first) [menu] → Analyze Graph (6) → Bounded Area (8). Move the mouse to the desired intersection points and click on each one. This will find the area bounded by the two curves. Repeat if desired. The area will be printed on the screen in text. Finding the text is sometimes a challenge. Note: After you find the bounded area, you can [menu] → Analyze Graph (6) → Bounded Area (8) again. Click on the leftmost point of your bounded region, then move the mouse to the right. On the screen you will see the accumulated area from the leftmost point of your bounded region to the location of the mouse as you move to the right. Special Project Examples – Calculus
Solid of Revolution about the ‐axis (3D) – Appendix C Connect a Geometry Item to a Curve in a Graph (2D) – Appendix C Volume by Cross Section (3D) – Appendix C TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 27 Graph a Differential Equation (i.e., slope field) [menu] → Graph Entry/Edit (3) → Diff Eq (8) o Enter a differential equation in the form , . ,
, ,
, o Note that the function is really of the type: etc. That is, in the definition of the differential equation, you do not type as a variable; you must type the ‐variable name (e.g., or ) used on the left side of the equal sign. o Examples: ∙
or ∙
rd
o The prime ′ sign is in the symbol palate – 3 item in the 2nd row. Make sure the box next to the ’ definition is checked in the function entry line. This is the box that tells the nSpire whether or not to show the graph you define. [tab] → [click] to the […] box – to define the nature of the plot. [tab] to the initial condition field – enter ‐value [tab] ‐value, if desired. [tab] → [click] to the “additional conditions” box – to enter any additional conditions, if desired. Then, [OK]. [enter] to graph the differential equation (i.e., the slope field and particular solution based on the initial conditions). [esc] to remove the entry line from the screen so you can see the slope field better. Summation Access the Summation Template: – 7th item in the second row. On the bottom, enter the summation index variable and the starting value. On the top, enter the maximum value of the index variable. Note that this may be ∞. The ∞ sign is in the symbol palate – 5th item in the top row. On the right, enter the expression to be summed (in terms of the index variable). [enter]. Example: yields:
. Some infinite summations do not have nice solutions and the nSpire will not provide a desirable solution. Example: replace with in the above example to get a value for , and no solution is provided. In these cases, try a large value as the upper limit of the index to get an approximate value. Example: yields:
. This is the value of
.
.
Summations work very well when finite limits. Using the TI nSpire CX CAS Handheld yields: .
. TOC Hyper October 2, 2016 28 Sequences Seq(expression, var, low, high[, step]) – generates a sequence based on expression. var increments from low to high in steps of 1 unless step is provided. Examples: o Seq( , n, 1, 5, 2) yields: {1, 27, 125} (which is: 1 , 3 , 5 ) o Seq( /
, n, 1, 5, 2) yields: {1, , } (which is: ,
, ) Combining Summations and Sequences Sum(Seq(expression, var, low, high[, step])) – generates the sum of the items in the sequence provided. Examples: o Sum(Seq( , n, 1, 5, 2)) yields: 153 (which 1
3
5 ) o Sum(Seq( /
, n, 1, 5, 2)) yields: (which is: ,
, ) [ctrl] → [enter] – to get the decimal solution: 1.4504 TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 29 Chapter 7: Notes Application Open a Notes Page in a Document Note: the space key, , is located [ctrl] → [doc] → Add Notes (6), or at the bottom right of the nSpire. [ctrl] → I → Add Notes (6) The shift key, , is located above Then, type your notes the key. Select Text (that has already been typed) Selection: (this may take some practice) o Move the cursor to the beginning or end of a selection. o Hold down the [click] key, then press the [shift] key. o With the [shift] key still depressed, you can release the [click] key. Then, move the cursor or use the arrow keys to highlight the selection. Single Word: Place the cursor on a single word and double‐click to select the word. Sentence: Place the cursor anywhere within a sentence and triple‐click to select the entire sentence. Change Text Attributes (select text, then …) Font o [menu] → Format (4) → Format Text (1) o Select the font, font size, bold, italic, underline, etc. for the text. o Press [esc] to apply your selections. Foreground Color o [menu] → Format (4) → Text color (4) o Select a color, then click or [enter]. Background Color o [menu] → Format (4) → Fill color (3) o Select a color, then click or [enter].
[ctrl] → [menu] (Right Click) Menus for selected text →
Sample page with text modified: TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 30 Use Shapes and Special Characters To input a special character, access the symbol template: . This gives access to: and many more symbols. To insert a shape, such as an angle, triangle or circle, [menu] → Insert (3) → Shape (3) Math Boxes A Math Box in a Notes Application is similar the Calculator App. You can define functions, perform calculations, etc.
[ctrl] → M or [menu] → Insert (3) → Math Box (1) to insert a Math Box, or press a mathematical function key, e.g., , to automatically open a Math Box.
Attributes of the Math Box can be changed: position yourself inside the math box you want to change and press: [ctrl] → [menu] → Math Box Attributes (8). A notes page, with and without the Math Box attributes menu open, are shown below.
Items defined in a Math Box are available throughout a problem in a document. For example, if a function, , is defined in a Math Box on a Notes page, it can be accessed as on Calculator and Graphs pages in the same problem. Chem Boxes A Chem Box is useful for formatting chemical equations. [ctrl] → E or [menu] → Insert (3) → Chem Box (2) to insert a Chem Box. Type the equation. Recall that the " → " key is located in the symbol palette: . Subscripts will automatically be placed in the proper position.
Example. Type: 2CO
Output on screen: Using the TI nSpire CX CAS Handheld MoO2 → 2CO2
Mo [enter] TOC Hyper October 2, 2016 31 Chapter 8: Lists & Spreadsheet Application Open a Lists & Spreadsheet Page in a Document [ctrl] → [doc] → Add Lists & Spreadsheet (4), or [ctrl] → I → Add Lists & Spreadsheet (4) Size of page: 26 columns; 2,500 rows Moving around Use arrow keys to move from cell to cell within a spreadsheet. Move to a specific cell: [ctrl] → G or [menu] → Actions (1) → Go To (4), then type the cell reference (e.g., B3) and press [enter]. [enter] – moves down one row in the current column. [tab] – moves to the column title in the current column (or back into the body of the spreadsheet). [tab] acts as a toggle in this regard. Move to Row 1 in the current column: [ctrl] → 7. Move to the last filled cell in the current column: [ctrl] → 1. Page up in the current column: [ctrl] → 9. Page down in the current column: [ctrl] → 3. Naming columns Move to the top row in a column using the arrow keys or [tab]. Type the name of the column. Only lower case letters are used in column names. Cut, Copy, Paste – Highlighted rows and columns may be cut, copied and pasted: [ctrl] → X – Cut [ctrl] → C – Copy [ctrl] → V – Paste [ctrl] → Z or [ctrl] → [esc] – Undo (if you make a mistake) [ctrl] → Y – Redo (if you want to “undo” an undo) Select an Entire Row – While positioned in the row you want to select, either: Move to the far left of the row and press , or [menu] → Actions (1) → Select (3) → Select Row (1). Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 32 Select an Entire Column – While positioned in the column you want to select, either: Move to the far top of the column and press , or [menu] → Actions (1) → Select (3) → Select Column (2) Select a Block of Cells Move to one corner of the block you wish to select. Hold down the shift key and use the arrow keys to move to the other corner of the block. Delete a Row, Column or Block of Cells Select the entire row, column or block of cells you want to delete (see above). Press [del]. Insert a Cell, Row or Column – From any location in the spreadsheet, the inserted row or column will be placed where you currently reside, like in Microsoft Excel. [menu] → Insert (2) → Insert Cell (1) – to insert a single cell. This moves all other cells in the column down one space. [menu] → Insert (2) → Insert Row (2) – to insert a row [menu] → Insert (2) → Insert Column (3) – to insert a column Move a Column – Move to a cell in the column you want to move. Then: [menu] → Actions (1) → Move Column (1) – use the arrow keys to move to where you want the column to appear. If moving the column to the right, it will be placed just to the left of the bold vertical guide line. If moving the column to the left, it will be placed just to the right of the bold vertical guide line. Resize a Column – Move to a cell in the column you want to resize. Then: [menu] → Actions (1) → Resize (2) → Resize Column Width (1) – then use the arrow keys to change the size of the column. [menu] → Actions (1) → Resize (2) → Maximize Column Width (2) – creates a column that takes up most of the screen width. [menu] → Actions (1) → Resize (2) → Minimize Column Width (3) – changes the size of the column to the minimum that fits the data in the column. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 33 [ctrl] → [menu] (Right Click) Menus in a Spreadsheet With a: Cell Selected Column Selected Row Selected Using Formulas in a Spreadsheet Works very similar to Microsoft Excel. Move to the cell in which you would like to enter a formula. Type the " " sign, followed by whatever formula you want to use. Then, [enter]. o Use cell references, example: =a1^(a2 2) Keyboard functions that can be used in the Calculator application are available for use in cell formulas. A line on the bottom of the screen shows the formula in the current cell. If a data item in the spreadsheet changes, all of the other cells will update automatically. If you face a situation where you need to manually recalculate all cells, this can be done by pressing [ctrl] → R or [menu] → Actions (1) → Recalculate (5) Copy Formulas to Other Cells Move to the cell you would like to copy. Then, press [ctrl] → Click to select the formula in that cell.
Move up, down, left or right using the arrow keys to indicate which cells are to receive the formula. The cells into which the formula will be copied are identified by bold dashed lines (see the figure at right). Then, press [enter] to copy the formula to the indicated cells. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 34 Absolute and Relative Cell References The default cell reference is relative, meaning that when a cell is copied to other cells, each input maintains the relative position it had in the original cell. o Example: If A4=A1+A2, note that A1 is 3 cells above A4 and A2 is two cells above A4. o Copying cell A4 into cell C8 will make C8=C5+C6. C5 is 3 cells above C8 and C6 is two cells above C8. When entering a formula, placing a $ before either the column (letter) or row (number) of a cell reference will maintain that column or row when the formula is copied. This is called an absolute cell reference. o Example: If A4=$A1+A$2, then, when A4 is copied, the column for the first input remains constant, and the row for the second input remains constant. o Copying cell A4 into cell C8 will make C8=$A5+C$2. o This is especially useful if a single cell is use multiple times, for example a single interest rate to be used for multiple calculations. The rate could be placed in cell A1 and referred to as $A$1 in all formulas. Summary: Column references (letters) and row references (numbers) should be considered separately when creating formulas. o Any reference (column or row) with a $ in front of it is absolute (i.e., will not change when copied). o Any reference (column or row) without a $ in front of it is relative (i.e., will change when copied). Reference a Block of Cells A rectangular block of cells can be referenced in the form “top left cell”:”bottom right cell”. For example, you would reference the cells in rows 4 to 7 which are in columns C to E, i.e., the block of cells from C4 to E7, as C4:E7. The colon character “:” can most easily be typed via the Template, located near the bottom right of the nSpire. Example: If you were to type =sum(C4:E7) into cell F7, this would place the sum of the 12 cells in the block C4:E7 into cell F7. o “sum” is a function available in the nSpire’s Library. nSpire functions may be typed into a Calculator page, a Math Box, or a cell in a Spreadsheet. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 35 Insert Data in Multiple Rows of a Column To insert data in multiple rows using a formula that contains a number of trials: Enter the formula in the Formula Row (the row between the Name of the column and Row 1): Example: =randint(3, 6, 15) inserts random numbers from 3 to 6 in the first 15 rows of the column. To insert data in multiple rows using a sequence: Move to the Formula Row in the column where you wish to enter data: [menu] → Data (3) → Generate Sequence (1) A table similar to the one at right will appear to help you to define the sequence. o Formula u(n) = : enter the formula for the data entries. The formula can be a simple as n if you wish to show the row number or it can be more complex. The element in Row 1 will be u(n0) unless initial terms are specified. o Initial Terms: enter any terms you want to use to start your sequence. You may enter multiple terms, separated by commas if you wish. The Formula u(n) will be used in rows below the last entered initial term. o n0: the label on this should be n1, in my opinion. It is the first value of n to be used to define an element in the column (if there are no initial terms specified). If initial terms are specified, they override the values calculated using the formula. o nMax: the maximum value of n used in the formula. Note: fewer values of n could be used if the Ceiling Value is specified. Ceiling Value overrides nMax. o nStep: the increment in n if one is desired. The items entered in the column will be: u(n), u(n+nStep), u(n+2∙nStep), u(n+3∙nStep), … o Ceiling Value: the maximum value to be entered in the column. The sequence will end with the last value equal to or below Ceiling Value. o Click on OK when you are finished defining your sequence. If you do not like the resulting sequence, you can redefine it using the same steps. The formula may be recursive, i.e., it may refer to other elements in the column. Example: u(n) = u(n‐1) + u(n‐2), with initial terms of “1,1” could be used to generate the Fibonacci sequence. To move quickly among rows you may use the following shortcuts: o [ctrl] → 1 to move to the bottom element in the row. o [ctrl] → 7 to move to the top element in the row (i.e., Row 1). o [ctrl] → 3 to move down one screen. TOC o [ctrl] → 9 to move up one screen. Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 36 Chapter 9: Probability [menu] → Probability (5) – to open the Probability Menu and generate random numbers or probabilities based on a specified distribution. Menu Items – Probability Probability [Menu]
Factorial: 1 – inserts the factorial sign (!) after the item. 1 Factorial (!) 2 Permutations 3 Combinations 4 Random 5 Distributions Permutations: 2 – inserts the function nPr(). The user must insert “n, r” in the parentheses. Returns the number of permutations of n items taken r at a time. For permutations, selection order matters. Combinations: 3 – inserts the function nCr(). The user must insert “n, r” in the parentheses. Returns the number of combinations of n items taken r at a time. For combinations, selection order does not matter. Random: 4 – generates random numbers as follows:
Number (1) – inserts the function rand(num), which generates num random real numbers between 0 and 1. Integer (2) – inserts the function randInt(lowbound, upbound [, num]), which generates a random integer between lowbound and upbound. num, when specified, returns num random integers in the desired range. Binomial (3) – inserts the function randBin(n, p [, num]), which generates a random (integer) number of successes in n trials with probability p of success. num, when specified, returns the results of num trials. Normal (4) – inserts the function randNorm( , , [, num]), which generates a random real number from a Normal Distribution with mean and standard deviation . num, when specified, returns the results of num trials. Sample (5) – inserts the function randSamp(List_name, nun [, noRepl]), which generates num random values from the pre‐defined list List_name. noRepl, when specified, returns results without replacement. Seed (6) – inserts the function randSeed n_Seed. n_Seed becomes the seed value for further random number generation. Use this command to set a random seed when you would like to be able to replicate your random numbers. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 37 Distributions: 5 – provides probability density function (PDF) values or cumulative areas under the PDF for various distributions:
Normal Pdf (1) – inserts the function normPdf(x, , ), which provides the ‐value associated with the given ‐value for a Normal PDF with mean and standard deviation . Normal Cdf (2) – inserts the function normCdf(low, high, , ), which provides the area under the curve between and for a Normal PDF with mean and standard deviation . Inverse Normal (3) – inserts the function invNorm (area, , ), which provides the ‐
value associated with the given area under the curve from ∞ to for a Normal CDF with mean and standard deviation . t Pdf (4) – inserts the function tPdf(t, ), which provides the ‐value associated with the given ‐value for a Student’s t PDF with degrees of freedom. t Cdf (5) – inserts the function tCdf(low, high, ), which provides the area under the curve between and for a Student’s t PDF with degrees of freedom. Note that you must calculate the required ‐values using a formula such as
̅
/√
to use tPdf(t, ) or tCdf(low, high, ) properly. Inverse t (6) – inserts the function invT (area, ), which provides the ‐value associated with the given area under the curve from ∞ to for a Student’s t PDF with degrees of freedom. Pdf (7) – inserts the function Pdf(x, ), which provides the ‐value associated with the given ‐value for a PDF with degrees of freedom. Cdf (8) – inserts the function Cdf(low, high, ), which provides the area under the curve between and for a PDF with degrees of freedom. Inverse (9) – inserts the function inv (area, ), which provides the ‐value associated with the given area under the curve from 0 to for a CDF with degrees of freedom. F Pdf (A) – inserts the function FPdf(x, , ), which provides the ‐value associated with the given ‐value for an F PDF with degrees of freedom in the numerator and degrees of freedom in the denominator. Note: The F distribution is used predominantly in Analysis of Variance (ANOVA) to test whether two independent samples have been drawn from populations with the same variance. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 38
F Cdf (B) – inserts the function FCdf(low, high, , ), which provides the area under the curve between and for an F PDF with degrees of freedom in the numerator and degrees of freedom in the denominator. Inverse F (C) – inserts the function invF (area, , ), which provides the ‐
value associated with the given area under the curve from 0 to for an F CDF with degrees of freedom in the numerator and degrees of freedom in the denominator. Binomial Pdf (D) – inserts the function binomPdf(n, p, x), which provides the probability of successes in n trials with probability p of success. Binomial Cdf (E) – inserts the function binomCdf(n, p, x1, x2), which provides the probability of to successes in n trials with probability p of success. Geometric Pdf (F) – inserts the function geomPdf(p, x), which provides the probability of the first success occurring on the ‐th trial, with probability p of success. Geometric Cdf (G) – inserts the function geomCdf(p, x1, x2), which provides the probability of the first success occurring on the ‐th to ‐th trials, with probability p of success. Poisson Pdf (H) – inserts the function poissPdf( , x), which provides the probability of of successes if the average number of successes in the given time period is . Note: In a Poisson distribution, by:
,
and . The probability of successes is given . !
Poisson Cdf (I) – inserts the function poissCdf( , x1, x2), which provides the probability of to successes if the average number of successes in the given time period is . TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 39 Chapter 10: Statistics [menu] → Statistics (6) – to open the Statistics Menu. To work with data, input the data in a Lists & Spreadsheet application first. Name each column that you wish to use by typing its name in the top row of the column. These names will be used to reference the data in the columns for statistical applications. Enter data beginning in Row 1. Note: Some data can be entered in multiple rows by entering formulas in the Formula Row (the row between the Name of the column and Row 1). o Example: =randint(3, 6, 15) inserts random numbers from 3 to 6 in the first 15 rows of the column. Note: if you use random values, you can recalculate a new set with [ctrl] → R. o Example: [menu] → Data (3) → Generate Sequence (1) – to insert the elements of a sequence in the cells in a column (e.g., 1, 2, 3, … or 3, 5, 7, …). See page 35. Quick Graph After data in one or more columns have been named and entered: Select a column by clicking on the letter (not the name) at the top of the column or by pressing the up arrow from the row containing the column name. Select a second column if working with two‐variable data: o The independent variable should be in the leftmost of the two columns to be selected, and the dependent variable should be to its immediate right. With the column containing the independent variable selected, hold down the shift key and press the right arrow once to include the second column in the selection. [menu] → Data (3) → Quick Graph (9) to show a dot plot of the data. Graph on a Separate Page [ctrl] → I → Add Data & Statistics (5) to begin a graph of the data. The data shown will be the set in column A of the List & Spreadsheet application. Click on the ‐axis label and select the independent variable from the list provided for the graph. If this is the only variable entered, you will see a dot plot of ‐values. To add a dependent variable to the graph, click on the ‐axis label of the graph (or press [tab]), and select the dependent variable from the list provided. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 40 Working with the Graph On the Data & Statistics page, you can change the plot type, plot properties, remove a variable (or both variables), add a slider, add text, plot a regression equation of any available type, or modify the graph window. You can also add data to existing lists. Just edit any formulas in the Formula Row, copy formulas to new cells, or enter data directly. One caution: if data in a column is determined based on a formula in the Formula Row, direct data entry may cancel the formula. One Variable Data With a single variable defined in the plot: Quantitative data: [menu] → Plot Type (1) allows you to select a Dot Plot (1), Box Plot (2), Histogram (3) or Normal Probability Plot (4). Categorical data: [menu] → Plot Type (1) allows you to select a Dot Chart (7), Bar Chart (8) or Pie Chart (9). To change variables, click on the ‐axis label and select the variable from the list provided. You can force quantitative data to be displayed as categorical data by pressing: [menu] → Plot Properties (2) → Force Categorical X (B). Note: in this mode, data are considered alphabetically, so, for example, 10 will reside between 1 and 2. Move a category by [ctrl] → Click‐ing it and dragging the label where you would like it to be. You can force categorical data which are based on quantitative values to be displayed as quantitative data by pressing: [menu] → Plot Properties (2) → Force Numerical X (B). Two Variable Data and Regression With both ‐ and ‐variables defined in the plot: [menu] → Plot Type (1) allows you to select either a Scatter Plot (5) or an XY‐Line Plot (6). These are identical except the XY‐Line Plot connects the dots with lines. To add a regression line, [menu] → Analyze (4) → Regression (6) and select the type of regression desired. Both the regression curve and its equation will be shown on the graph. To show the plot of residuals below the regression plot, [menu] → Analyze (4) → Residuals (7) → Show Residual Plot (2) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 41
Note about selecting a regression method: Be careful to consider the nature of the data you are plotting when selecting a regression method. More powerful methods, e.g., cubic rather than linear, will typically be better fits, but not necessarily because the model is better. Randomness in the data can be disguised by using too powerful a method. In general, it is best to use the simplest model that generates random residuals that do not fan out significantly at either end of the graph. To plot a vertical line for a particular ‐value, e.g., the mean or median of the ‐values, [menu] → Analyze (4) → Plot Value (8) and enter the value or an expression for the value to be plotted, e.g., mean(input_list). The line will be plotted only on the original data plot, not the residual plot. To see the impact of a single point (e.g., an influential point or an outlier), [ctrl] → click on the point and move it with the cursor or arrow keys. The point becomes hollow and highlighted. The regression curve and residuals, if shown, will move with it. o To leave the point in its new location, press [enter]. o To put the point back where it was, [ctrl] → [esc] or [ctrl] → Z. o To change the point’s form back to what it was before you moved it, click on it. After preforming a Regression: [menu] → Statistics (6) → Stat Results (2) – provides key items from the analysis. For individual items, including items not listed in these results, see the next bullet point. stat. (make sure you type the dot) will provide an opportunity to view and/or use the results of the analysis. For example, after a Linear Regression, stat. brings up the menu at right, from which the user may select any of the items shown. Of particular interest: o resid provides a list of the residuals of the regression. Examples: Stat Results for a Linear Regression.
stat. selection of individual items from the menu.
TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 42 Confidence Intervals [menu] → Statistics (6) → Confidence Intervals (6) and select the type of confidence interval you would like to create. Press [enter]. In the Data Input Method menu that pops up: o Select Data if you want to base your interval on a set of data in a List. You will then be asked for the items (e.g., List name, the frequency list and the confidence level) that will be used to create the Confidence Interval. Select OK. o Select Stats if you would like to base your interval on a set of statistics. You will then be asked for the values of the statistics (e.g., mean, standard deviation, , confidence level) that will be used to create the Confidence Interval. Select OK. Hypothesis Tests [menu] → Statistics (6) → Stat Tests (7) and select the type of test you would like to perform. Press [enter]. In the Data Input Method menu that pops up: o Select Data if you want to base your test on a set of data in a List. You will then be asked for the items (e.g., test value, List name, the frequency list and the type of alternative hypothesis) you wish to use to perform the test. Select OK. o Select Stats if you would like to base your test on a set of statistics. You will then be asked for the values of the statistics (e.g., test value, mean, standard deviation, , and the type of alternative hypothesis you wish to use) that will be used to perform the test. Select OK. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 43 Menu Items – Statistics Statistics [Menu]
Stat Calculations: 1 – use to perform a statistical analysis on 1‐
1 Stat Calculations variable data or 2‐variable data, including regression analysis. 2 Stat Results One‐Variable Statistics (1) – provides a set of statistics for 3 List Math the list identified. 4 List Operations Two‐Variable Statistics (2) – provides a set of statistics for 5 Distributions each of two lists identified, typically and . 6 Confidence Intervals Linear Regression (3) – provides the results of a 7 Stat Tests linear regression in the form . Linear Regression (4) – provides the results of a linear regression in the form . Median‐Median Line (5) – provides a regression line based on the medians of the three thirds of data, when data are aligned according to values of the independent variable. Quadratic Regression (6) – Regression using a 2nd degree polynomial. Cubic Regression (7) – Regression using a 3rd degree polynomial. Quartic regression (8) – Regression using a 4th degree polynomial. Power Regression (9) – Regression using a power function. Exponential Regression (A) – Regression using a exponential function. Logarithmic Regression (B) – Regression using a logarithmic function. Sinusoidal Regression (C) – Regression using a sine function. Logistic Regression (D) – Regression using a logistic function. Logistic Regression (E) – Regression using a logistic function. Multiple Linear Regression (F) – Regression on multiple variables using linear functions. Correlation Matrix (G) – provides a matrix of the correlations of the variables in a Multiple Linear Regression. Stat Results: 2 – provides the results of any statistical analysis performed. List Math: 3 – provides the following elements related to a set of one‐variable data (any list):
Minimum (1) Maximum (2) Mean (3) Median (4) Sum of Elements (5) Product of Elements (6) Sample Standard Deviation (7) – using 1 in the denominator Using the TI nSpire CX CAS Handheld
Sample Variance (8) – using 1 in the denominator Population Standard Deviation (9) – using in the denominator Population Variance (A) – using in the denominator TOC Hyper October 2, 2016 List Operations: 4 – perform operations on a list of data: Sort Ascending (1) Augment (7) Sort Descending (2) Convert List to Matrix (8) Cumulative Sum List (3) Convert Matrix to List (9) Fill (4) Left (A) Sequence (5) Mid (B) Difference List (6) Right(C) Distributions: 5 – See Probability (p.37) for descriptions. Pdf (7) Binomial Pdf (D) Normal Pdf (1)
Cdf (8)
Binomial Cdf (E) Normal Cdf (2) Inverse (9) Geometric Pdf (F) Inverse Normal (3) F Pdf (A) Geometric Cdf (G) t Pdf (4) Poisson Pdf (H) F Cdf (B) t Cdf (5) Inverse F (C) Poisson Cdf (I) Inverse t (6) Intervals: 6 z Interval (1) 1‐Prop z Interval (5) t interval (2) 2‐Prop z Interval (6) 2‐Sample z Interval (3) Linear Reg t Intervals (7) 2‐Sample t interval (4) Multiple Reg Intervals (8) Stat Tests: 7 z Test (1)
2‐way Test (8) t Test (2) 2‐Sample F Test (9) 2‐Sample z Test (3) Linear Reg t Test (A) 2‐Sample t Test (4) Multiple Reg Tests (B) 1‐Prop z Test (5) ANOVA (C) 2‐Prop z Test (6) ANOVA 2‐Way (D)
GOF Test (7) TOC Hyper 45 Chapter 11: Connectivity Connecting Two nSpires The cable used to connect two nSpires has a mini‐USB connection on each end. You can connect two nSpires as long as they have the same keypad. Insert one end of the mini‐USB cable into each nSpire. The USB connection for an nSpire CX CAS is located on the top of the handheld – see the illustration at right. Copying Files or Folders between nSpires Connect the two nSpires. On the nSpire that contains the file or folder to be Transferred, press: [home] → My Documents (2) to open the document file browser. Use the arrow keys to highlight the file or folder you want to copy. [doc] → File (1) → Send (6) to send the file to the other nSpire. A progress bar will be displayed during the transfer and a notification will be displayed when the transfer is complete. Connecting an nSpire to a PC (note: this will also charge the nSpire battery) The cable used to connect an nSpire to a PC has a mini‐USB connection on one end and a standard USB connection on the other end. Insert the mini‐USB cable into the nSpire and the standard USB cable into your PC. You may copy files to or from the PC using TI software. If you have not purchased either the Teacher or Student software, you may use the free TI nSpire computer link software for this purpose. It is available at: https://education.ti.com/en/us/software/details/en/82035809F7E6474099944056CCB0
1C20/ti‐nspire_computerlink. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 46 Charging the nSpire battery The cable used to charge an nSpire is the same one used to connect it to a PC. Insert the mini‐USB cable into the nSpire. Insert the standard USB cable into either a PC or a wall charger. If you use a wall charger, you must plug the wall charger into a standard AC outlet (sorry – had to say that). TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 47 Chapter 12: Programming Programming Languages
TI Basic is the simpler of the two programming languages you can use on the TI nSpire. More about TI Basic is presented below. o The Basic programming language is easy to learn, as its name implies. Books on Basic programming can be found at most booksellers. o A sample program in TI Basic, for rolling dice, is shown above. o TI Basic is similar to, but not exactly the same as, the Basic programming language. A good online primer on TI Basic is available at: Error! Hyperlink reference not valid.. Anyone wanting to program the TI nSpire should begin here. o A guide to programming in TI‐Basic can be found on pages 315‐342 of the TI nSpire Software Manual (pages 327‐354 of the PDF file), which is available at: http://www.manualslib.com/download/325947/Ti‐Ti‐Nspire.html.
Lua is a more complex language, and includes substantial graphical capabilities. Lua programming is not covered in this document. o Information on Lua programming can be obtained at: https://www.lua.org/. o Some examples of Lua programming can be found on John Hanna’s nSpire page at: http://www.johnhanna.us/TI‐nspire.htm. The screens for two of John’s latest programs are shown below. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 48 Functions vs. Programs User‐defined functions and programs are together referred to as scripts. They differ in complexity, functionality and design.
Functions are usually short and return a single result to the user. In fact, a function’s purpose is to return a value. Functions may be used within mathematical expressions; programs cannot. Functions can be graphed; programs cannot Programs are typically longer than functions and involve more logical decision making. Programs are run outside of mathematical expressions, and may produce numerous results for the user. Some processes can be developed through either a program or a function. Which approach you choose to use will ultimately depend on the complexity of the process you are modeling and how you wish to use the result(s). Although we do not cover TI Basic programming in detail in this document, it may be helpful to take a look at a sample function and a sample program. We do this below. But first, … Writing a Script in TI Basic To write a script (i.e., a function or program), you must be on a Calculator page in Problem 1 in a document. You can be on any page in Problem 1. You cannot write a script in the Scratchpad. It is a good idea to create a document to contain functions and programs only. If you write a lot of scripts, you may want to create several such documents in order to organize them.
To begin writing a script, on a calculator page, press: [menu] → Functions & Programs (9) → Program Editor (1) → New (1).
Assign a name to the script. Note: you do not need to tell the nSpire the arguments (i.e., the variables in the parentheses of the script definition) that you wish to use with the script until after you enter the scripting panel on the page.
Identify the script as a function or program (see above for the difference).
Identify the type of library access you desire. None leaves the script in the library for the current problem only. LibPriv places it in a private library. LibPub will make it possible for you to place your script the nSpire Catalog, so you will be able to access it in other documents or the Scratchpad.
Click on OK or press [enter] when you are done.
The page will split to show a panel containing the script, with some lines pre‐set.
[ctrl] → [tab] will move you back and forth between the panels on the screen. Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 49 Writing a Function in TI Basic Follow the instructions under “Writing a Script” above, identifying the script as a function. If you wish the function to be available in the nSpire Catalog, be sure to select LibPub as the type of library access you desire. Let’s look at a sample function. The one shown below is handy in Probability Theory – the randIntNoRep function, which returns a set of non‐repeating integers over a specific range (lowBound to upBound). The function exists in the TI‐84 Catalog, but for some reason is not included in the default nSpire Catalog. The solution: write a function so you can use it on the nSpire. By writing this function, we reduce the required calculator entry from: randSamp(seq(x, x, lowBound, upBound, 1), n, 1) to randIntNoRep(n, lowBound, upBound), which is simpler and much easier to remember. Further, randIntNoRep can be placed in the nSpire Catalog so it can be used in any document or on the scratchpad of your nSpire. Let’s take a look at the function randIntNoRep line by line:
Line 1: Define LibPub randintnorep(numint, lowbound, upbound)= This line is generated by the program editor. It contains the name of the program, the library access for the function and parentheses. Every function has a name followed by parentheses; if you wish to pass arguments to the function, you must type them in the parentheses in the top line. I typed the arguments , lowBound and upBound inside the parentheses to let the function know that I want it to return integers between lowBound and lowBound, inclusive.
Line 2: Func This line is placed in the program by the program editor. It identifies this script as a function (i.e., not a program).
Line 3: Local x This line provides the names of any variables that I want to define inside the script only – that is, I do not want these variables to exist in the problem after the script runs. Every variable used in a function should be either an argument passed to the function by the user (e.g., numint) or listed in a Local statement. Otherwise, you may inadvertantly create variables in your document.
Line 4: min(numint, upbound‐lowbound+1)→numint Just to eliminate errors, I wanted to make sure it was not possible to ask for more integers than exist in the specified range. So, I limit numint to the number of integers in the range between TOC lowBound and lowBound, inclusive. Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 50
Line 5: Return randSamp(seq(x, x, lowbound, upbound, 1), numint, 1) This is the guts of the function. I use the more complicated nSPire functions to generate the list of random integers I want. The keyword Return tells the function that the result of this statement is what should be returned to the user. All functions have one or more Return statements; without them, nothing is returned to the user and the function is useless.
Line 6: EndFunc This line is placed in the function by the program editor. It signifies the end of the function. See After Writing Your Script below for the processes that must occur after you write your function to make sure it works properly and becomes available via the nSpire Catalog. Writing a Program in TI Basic Follow the instructions under “Writing a Script” above, identifying the script as a program. If you wish the program to be available in the nSpire Catalog, be sure to select LibPub as the type of library access you desire. Let’s look at a sample program. The one shown here, Dice, simulates the rolling of dice and returns the message “You rolled“ followed by the total number rolled.
Line 1: Define LibPub dice(n)= This line is generated by the program editor. It contains the name of the program, the library access for the program and parentheses. I placed the argument inside the parentheses to let the program know how many dice will be rolled.
Line 2: Prgm This line is placed in the program by the program editor. It identifies this script as a program (i.e., not a function).
Line 3: Local a,b,i This line provides the names of any variables that I want to define inside the program only – that is, I do not want these variables to exist in the problem after the script runs. Every variable used in a program should be either an argument passed to the function by the user (e.g., n) or listed in a Local statement. Otherwise, you may inadvertantly create variables in your document.
Line 4: b:=0 The variable is what I will use to accumulate the total of the dice thrown. So, I need to initialize it at a value of 0. Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 51
Line 5: For i,1,n to line 8: EndFor This four‐line block of code is a standard For‐Loop in the Basic programming language. I told the program to execute lines 6 and 7 multiple times, as the variable i is iterated from 1 to n. Each iteration assigns a random number from 1 to 6 to the variable , then adds to the accumulated total in .
Line 9: Disp “You rolled”, b I want the user to understand the output of the program, so I created a message to be printed on the screen along with the result.
Line 10: EndPrgm This line is placed in the program by the program editor. It signifies the end of the program. After Writing Your Script After you have written your script (either a function or a program), you should check to see if the nSpire can understand what you wrote and save your script.
If you are not already in the panel containing the script, [ctrl] → [tab] to it.
To check your syntax (i.e., whether you wrote the script so the nSpire can understand it), and save the script to the nSpire’s memory, o Press: [menu] → Check Syntax & Store (2) → Check Syntax & Store (1) or, use the shortcut [ctrl] → B. If your syntax is incorrect, you will receive an error message describing the error. Note: if your syntax is correct, your script may still contain logical errors – the nSpire only does what you tell it to, so be precise in your scripting efforts. o If you want to check your syntax before saving your work, press: [menu] → Check Syntax & Store (2) → Check Syntax (2)
Finally, move back to the Calculator panel and test your script. For example, In the case of the sample program dice(n), the user must type dice(3) to roll 3 dice, dice (5) to roll 5 dice, etc. Check to see if the results make sense.
If the script does not behave the way you wanted it to, you will need to move back to the scripting panel and correct your script. Saving Your Script to the Catalog The following steps must be taken to save your script so that it is available from the nSpire catalog for use in other documents and the Scratchpad.
First, make sure each script that you want to access via the catalog has the keyword LibPub in the definition line. Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 52
Save the file containing the scripts in the MyLib directory with a name you can easily remember.
Refresh the Public Library, and therefore the Catalog, by pressing: [home] → My Documents (2) → [menu] → Refresh Libraries (B) At this point you will be able to access your functions and programs in any situation where you need them. Accessing User‐Defined Scripts from the Catalog To access any your scripts from the Catalog, you must remember the name of the file in which you saved them in the MyLib directory. The steps to access your scripts are:
From a Calculator page, press the catalog key: Press: 6 to bring up the set of user‐defined scripts. You will see something like the display in the figure at left. Click on the name of the file that includes your scripts. You will see something like the display in the figure at left. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 53
Click on the name of the script you wish to use. On the screen, you will see the name of the file containing your script, a backslash (\) and the name of the script. Enter any arguments required inside the script’s parentheses and press [enter] to see the results. See the figure at right, which contains several executions of the function randintnorep to generate three non‐repeating random integers between 7 and 15, inclusive. Note that functions may be used inside programs and other functions, so you can create some rather intriguing cascades of functions. Just be sure you do not outsmart yourself. Automated processes are best developed in small steps, where the results of each step can be evaluated for reasonableness. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 54 Some Keywords and Structures to Know When Programming Scripts You will need to study how to program if you want to write anything beyond the simple types of scripts shown in this chapter. Below is a list of some of the keywords you should be aware of if you choose to write scripts:
Disp expression or string [, expression or string] … – prints the message or variable value in expression or string on the screen. An expression may contain one or more variables, operations, functions, etc.
Request prompt string, variable – requests input from the user. The prompt string must be in quotes (“”); it is displayed on the screen in a dialog box. When the user enters the value of variable in the box and presses [enter], the program continues.
Return expression – used in a function to return expression as the result of the function. In a subroutine, Return (with no argument) is used to exit the subroutine.
Lbl label name – identifies a location within the program with the label provided.
Goto label name – causes the program to branch to the location label name.
Stop – stops the current process.
For variable, start value, end value [, step] Block of code EndFor
Executes a block of code starting with the variable equal to start value, then incrementing variable repeatedly by step, stopping when the incremented value exceeds end value. If step is not present, the increment is 1. While expression Block of code EndWhile Executes a block of code as long as expression is true.
Loop Block of code EndLoop Executes a block of code repeatedly until you actively exit the loop. There must be a condition in the block of code that executes an Exit command or the loop will be infinite.
If expression Then Block of code Else Block of code EndIf Executes the first block of code if expression is true and the second block of code if expression is not true. Many functions and programs can be written with just these keywords (and, of course, variable manipulation). Learn more at: TOC https://education.ti.com/en/us/solutions/ti‐codes. Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 55 Appendix A Keyboard Shortcuts for the TI‐nSpire CX CAS Document
[ctrl] → N – New document. [ctrl] → O – Open document. [ctrl] → W – Close document. [ctrl] → S – Save document. [ctrl] → I – Insert a page within a problem in a document. Copy, Paste, etc.
[ctrl] → Z – Undo. Also [ctrl] → [esc] [ctrl] → Y – Redo. [ctrl] → X – Cut. [ctrl] → C – Copy. [ctrl] → V – Paste. pi theta infinity ∞ sqrt(…) abs(…) √ || @d @r degrees radians <= >= Graph Application
Keyboard Alternatives [ctrl] → G – add a function to a graph. [ctrl] → T – toggle between full screen and a split screen showing a table of values. @i @e Note: the “@” sign is in the 4th line of the symbol palette . Notes Application
Calculus
[ctrl] → M – insert a Math Box. [ctrl] → E – insert a Chem Box.
Lists and Spreadsheet Application
[ctrl] → G – move to a specific cell. [ctrl] → R – recalculate all formulas. Line Editing
Program Editor
[shift] → to open the integral template. [shift] → to open the derivative template. [ctrl] → [ctrl] → [ctrl] → [ctrl] → [ctrl] → B – check syntax and store program. [ctrl] → F – find a string in a program. [ctrl] → H – find and replace a string in a program. Using the TI nSpire CX CAS Handheld move to beginning of line. move to end of line. move up one page. move down one page. TOC Hyper October 2, 2016 56 Appendix B Some Keyboard Commands for the TI‐nSpire CX CAS Many commands can be input from the keyboard. Here are some of the more interesting ones. Note: the “@” key is in the 4th line of the symbol palette . The “>” key is the first symbol in the inequality palette . The “∠” key is in the 2nd line of the symbol palette . General
lock var1[, var2, …] – locks the specified variable(s) so it cannot be changed.
unlock var1[, var2, …] – unlocks the specified variable(s) so it can be changed. Algebra
abs(expression) – returns the absolute value of expression or list, or the magnitude of a complex expression. o abs
,
,
⇒ , , √
domain(expression, var) – returns the domain of expression over the variable. o domain
,
⇒
factor(expression) – factors expression. If expression is a number, returns the prime factorization of the number. o factor(
) ⇒ ∙
∙
o factor(230052) ⇒ ∙ ∙
cfactor(expression) – factors expression into complex factors if necessary. If the expression is a number, returns the prime factorization of the number. o cfactor(
) ⇒ ∙ ∙
∙ o cfactor(230052) ⇒ ∙ ∙
∙
completesquare(expression, var) – completes the square of expression in the given variable. o completesquare (
∙ ) ⇒ mod(expression, number) – returns expression modulo number o mod(13, 3) ⇒ 1 (because 13 mod3
1
polyroots(polynomial, var) – returns the real roots of polynomial in the variable given. , ⇒ {‐5, 2} o polyroots
TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 57
polyroots({list of coefficients}) – returns the real roots of polynomial with coefficients defined by the list. o polyroots , ,
⇒ {‐5, 2}
cpolyroots(polynomial, var) – returns the complex roots of polynomial in the variable given. o polyroots
, ⇒ ,
cpolyroots({list of coefficients}) – returns the real roots of polynomial with coefficients defined by the list. o polyroots , ,
⇒ ,
zeros(expression, var) – returns the real zeros of expression in the variable given. Same as polyroots for a polynomial, but can handle other functions. o zeros
, ⇒ ∙ (where, n1 is any integer)
czeros(expression, var) – returns the complex zeros of expression in the variable given. Same as cpolyroots for a polynomial, but can handle other functions. Trigonometry
expression @>sin – converts expression to one based only on the sine function. o 1‐cos(x)2@>sin ⇒ sin(x)2
expression @>cos – converts expression to one based only on the cosine function. o 1‐sin(x)2@>cos ⇒ cos(x)2
tCollect(expression) – converts products and integer powers of sines and cosines in expression to a linear combination of sines and cosines of multiple angles, angle sums and angle differences. It is the inverse of tExpand. o tCollect(sin(x)∙cos(y)) ⇒
tExpand(expression) – expands expression using the sine and cosine functions. o tExpand(sin(x+y)) ⇒ cos(x)∙sin(y)+sin(x)∙cos(y)
expression @>polar – converts Rectangular coordinates to Polar coordinates. o [1, 3.] @>polar ⇒ [3.16228 ∠1.24905] (angle result is in radians) o See below for conversion of Polar coordinates to Rectangular coordinates.
expression @>cylind – converts 3D Rectangular coordinates to Cylindrical. o [1, 2., 3] @>cylind ⇒ [2.23607 ∠1.10715 3] (angle result is in radians) TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 58
expression @>sphere – converts 3D Rectangular or Cylindrical coordinates to Polar. o [1, 2., 3.] @>sphere ⇒ [3.74166 ∠1.10715 ∠0.64052] (angle results are in radians) o [1, ∠ , 3.] @>sphere ⇒ [3.16228 ∠ ∠0.32175] (angle results are in radians)
Vector in polar form [enter] – converts Polar coordinates to Rectangular. o [menu] → Matrix & Vector (7) → Create (1) → Matrix (1) – to create a 1x2 matrix (a vector). The first element is the magnitude, the second element is the angle (use the ∠ key and enter the angle in radians). o
o
∠
∠
[enter] ⇒ √
,
√
(exact answer) [ctrl] → [enter] ⇒ [2.12132, 2.12132] (approximate answer) Matrices
augment(matrix1, matrix2) – returns a new matrix with matrix2 appended to matrix1 as new columns.
charpoly(square matrix, var) – returns the characteristic polynomial of square matrix in the variable specified.
det(square matrix) – returns the determinant of square matrix.
diag(list) – returns a diagonal matrix with the elements of list along the diagonal.
eigVc(square matrix) – returns the eigenvectors of square matrix.
eigVl(square matrix) – returns the eigenvalues of square matrix.
ref(matrix) – returns the row‐echelon form of matrix. o
⇒
rref(matrix) – returns the reduced row‐echelon form of matrix. o
⇒ TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 59 Calculus
fmax(expression, var[, lowbound[, upbound]]) – returns the function maximum of the expression. If lowbound and/or upbound are included, they restrict the domain over which the maximum is determined. ,
o fmax
, ,
⇒ .
,
or (which are the asymptotes) .
√
⇒ (which is the relative maximum of the function on the interval [‐4.99, ‐1.01]) fmin(expression, var[, lowbound[, upbound]]) – returns the function minimum of the expression. If lowbound and/or upbound are included, they restrict the domain over which the maximum is determined. Works the same way as fmax. normalLine(expression, var=value) – returns the equation of the line normal to expression at var value. , ,
o nomalLine
o fmax
⇒ tangentLine(expression, var=value) – returns the equation of the line tangent to expression at var value. , ,
o tangentLine
⇒ ∙
Probability and Statistics
o nCr ,
o ans|
⇒ ! !
∙
Note: The “|” key is the last ∙
symbol in second row of the inequality palette ⇒ 10 !
nPr(n, r) – returns o nPr ,
o ans|
!
nCr(n, r) – returns . !
⇒ ∙
⇒ 60 ∙
randSeed number – sets the random seed value for generating random numbers. If 0, the seed sets to the factory result. One way to get a decent random seed is to enter the time in minutes and seconds. Succeeding random numbers, then are more likely to be truly random. o randseed 1542 (for 15 minutes and 42 seconds past the hour)
rand() – returns a random decimal between 0 and 1. Using the TI nSpire CX CAS Handheld TOC Hyper October 2, 2016 60
rand(n) – returns n random decimals between 0 and 1.
randInt(lowBound, upBound[, n]) – returns a random integer between lowBound and upBound, inclusive.
randInt(lowBound, upBound[, n]) – returns n random integers between lowBound and upBound, inclusive.
randSamp(seq(x, x, lowBound, upBound, 1), n, 1) – returns n non‐repeating random integers between lowBound and upBound, inclusive. o randSamp(seq(x, x, 3, 8, 1), 6, 1) ⇒ {3, 6, 8, 4, 7, 5} o note: this is complicated to remember, so you may want to write a function “randIntNoRep(n, lowBound, upBound)” like exists on the TI‐84 and store it in the public library. The code for this is provided in Chapter 10.
mean(list[, freqList]) – returns the mean of the items in list with frequencies in freqList.
median(list[, freqList]) – returns the median of the items in list with frequencies in freqList.
stDevPop(list[, freqList]) – returns the standard deviation of the population in list with frequencies in freqList. It uses “n” in the denominator of the calculation.
stDevSamp(list[, freqList]) – returns the standard deviation of the sample in list with frequencies in freqList. It uses “n‐1” in the denominator of the calculation.
There are no Library functions for the skewness or kurtosis statistics of a population or sample.
sum(list[, Start[, End]]) – returns the sum of the items in list. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 61 Appendix C: Special Projects Solid of Revolution about the ‐axis
Add a Graphs page. [ctrl] → I → Add Graphs (2).
Break the display into two panels. [doc] → Page Layout (5) → Layout 2 (2).
Adjust the panel sizes. o [doc] → Page Layout (5) → Custom (1). o Use the arrow keys to change the page split so that roughly 1/3 is on the left.
In the left panel, plot the function to be revolved: [ctrl] → G → enter function definition.
Create a vertical segment under the curve that can be moved left and right. o Graph vertical line: [menu] → Graph Entry/Edit (3) → Relation (2) → o Add a slider for the constant c: [menu] → Actions (1) → Insert Slider (B). Set an initial value of so that you can see it well on the graph. o Mark the points of intersection of the line with your curve and the ‐axis: [menu] → Geometry (8) → Points & Lines (1) → Intersection Points (3). o Draw a segment between the two points of intersection: [menu] → Geometry (8) → Points & Lines (1) → Segment (5). Click on the points of intersection. o Hide the points of intersection and the vertical line . Hover the mouse over each, then [ctrl] → [menu] → Hide (4). Also, do this to labels if you like. o Change attributes of the curve or segment. Hover over the object, then [ctrl] → [menu] → Attributes (3) to change thickness or make dotted. [ctrl] → [menu] → Color (8) to change color. o Zoom as desired: [menu] → Window/Zoom (4).
Graph the disk and the solid of revolution in the right panel. Begin by clicking in the right panel (or [ctrl] → [tab]). The functions will be defined parametrically. o [menu] → View (2) → 3D Graphing (3). o [menu] → 3D Graph Entry/Edit (3) → Parametric (2). o Graph the disk in 3D: ,
; ,
∙
∙
; ,
∙
o Graph the solid in 3D: ,
; ,
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; ,
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o Change attributes, hide the 3D box, etc. for a prettier display. o Zoom as desired. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 62 Connect a Geometry Item to a Curve in a Graph Example: Equilateral Triangle
Add a Graphs page and plot a function: [ctrl] → G
Create a vertical segment under the curve that can be moved left and right. o Graph vertical line: [menu] → Graph Entry/Edit (3) → Relation (2) → o Add a slider for the constant c: [menu] → Actions (1) → Insert Slider (B). Set a value of that you can see well on the graph. o Mark the points of intersection of the line with your curve and the ‐axis: [menu] → Geometry (8) → Points & Lines (1) → Intersection Points (3). o Draw a segment between the two points of intersection: [menu] → Geometry (8) → Points & Lines (1) → Segment (5). Click on the points of intersection. o Hide the points of intersection and the vertical line . Hover the mouse over each, then [ctrl] → [menu] → Hide (3 or 4). Also, do this to labels if you like. o Change attributes of the curve or segment. Hover over the object, then [ctrl] → [menu] → Attributes (3) to change thickness or make dotted. [ctrl] → [menu] → Color (8) to change color. o Zoom as desired: [menu] → Window/Zoom (4).
Create an equilateral triangle with one side being the vertical segment. o Draw a pair of rotated segments: [menu] → Geometry (8) → Transformation (5) → Rotation (4). Click on the segment. Click on the bottom point of the segment. Type [enter]. Rotation is counter clockwise. Click on the segment. Click on the top point of the segment. Type [enter]. Rotation is counter clockwise. This will complete the triangle. o Change attributes and colors of the curve, segment and triangle. o Hide anything you do not want to show. TOC Hyper Using the TI nSpire CX CAS Handheld October 2, 2016 63 Volume by Cross Section Using 3D Parametric Equations Example: Square Cross Sections Add a Graphs page and plot functions:
[ctrl] → I → Graphs (2) – to add a Graphs page. [menu] → View (2) → 3D Graphing (3) → [esc] – to create a 3D graph. [menu] → View (2) → Hide Box (4) – to hide the 3D box. Add a slider for the constant c,which will vary with the variable : [menu] → Actions (1) → Insert Slider (B). Enter minimum and maximum values of , set a value of between the minimum and maximum values of , and click on Minimize. Then click [enter]. [menu] → 3D Graph Entry/Edit (3) → Parametric (2) – to make the graph parametric. Set the ranges of the , and variables that will be shown on the graph: [menu] → Range/Zoom (4) → Range Settings (1). Note that the ranges for some variables may need to be expanded in order to show the boundary lines for those variables on the graph. Plot each of the functions in the table below. Note that the functions will vary for cross sections other than a square. Some math is required to generate the correct functions. o [ctrl] → G (if needed, to open the entry line; it may already be open). o Enter the values of the ‐, ‐ and ‐equations of the curve. Make sure you [tab] to the ellipsis button to enter the proper ranges of the parameters t and u. o Adjust the attributes and color of the curve, hide labels, etc. Rotate the graph (w/ arrow keys or “ ” key) and move the slider to check out your creation. Graph settings range: ‐range: 0,
Curve ‐range: 0, 1.1 ‐range: 0, 1 1 2 3 4 5 top curve (height) base curve front boundary back boundary vertical slice ‐range 0, 2 0, 2 0,
‐range 0,
0,
Description __(t, u) __(t, u) __(t, u) 1
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3
0, 1 0, 1 0, 1 0, 1 ∙ 1
∙
3
Using the TI nSpire CX CAS Handheld 0 ∙ 0 0,
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TOC Hyper October 2, 2016 64 Appendix D Index of Hyperlinks to Key Items 1‐Variable Data Grab and move an object Program ‐ sample 2‐Variable Data Graph a vertical line Programming 3D Graph Graph orientation Programming keywords 3D Graph box – hide or show Graph settings Quick Graph (Statistics) Absolute cell reference Graph view (modification) Random numbers Area between curves Graph zoom options Regression Attributes Graphs Application Relative cell reference Brightness adjustment Graphs page menu items Resize page split Calculus graphs Group pages on single page Screen icons Calculator Application Hypothesis Testing Sequences Calculator page menu items Inequalities Slider Catalog Insert page in document Slope fields Charging the battery Insert problem in document Solid of Revolution Chem Box Intersection points Space key Confidence Intervals Keyboard commands Split screen Conics Keyboard shortcuts Spreadsheet Application Connectivity Lists Application Statistics Copying files and folders Math Box Summation Differential equation graphs Modulo operator Symbol palette Display – change panel width Normal line equation Table of Contents Document settings Normal line on a graph Tangent line equation Domain Notes Application Tangent line on a graph Expand syntax of a command Page layout options Trig Collect command Expression template Page views Trig Expand command External Links Parametric graph Underscore key Formulas in Spreadsheets Piecewise function Ungroup (split) pages Function ‐ sample Polynomial roots Variables Functions ‐ algebraic Probability Volume by Cross Section Functions and Programs Problems Wizards in Catalog In the Microsoft Word version of this document, you can go to a topic by pressing [ctrl] click on its description above. Both Microsoft Word and Adobe PDF (good for phones) versions of this document are available online at: http://www.mathguy.us/BySubject/nSpire.php. Using the TI nSpire CX CAS Handheld October 2, 2016 ">
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