TI-84 Plus and TI-84 Plus Silver Edition Guidebook

Erasing Points with Pt-Off(

To erase (turn off) a drawn point on a graph, follow these steps.

1.

Select

2:Pt-Off(

(point off) from the

DRAW POINTS

menu.

2.

Move the cursor to the point you want to erase.

3.

Press

Í to erase the point.

To continue erasing points, repeat steps 2 and 3. To cancel

Pt-Off(

, press

‘.

Changing Points with Pt-Change(

To change (toggle on or off) a point on a graph, follow these steps.

1.

Select

3:Pt-Change(

(point change) from the

DRAW POINTS

menu.

2.

Move the cursor to the point you want to change.

3.

Press

Í to change the point’s on/off status.

To continue changing points, repeat steps 2 and 3. To cancel

Pt-Change(

, press

‘.

Drawing Points from the Home Screen or a Program

Pt-On(

(point on) turns on the point at (

X=x

,

Y=y

).

Pt-Off(

turns the point off.

Pt-Change(

toggles the point on or off.

mark

is optional; it determines the point’s appearance; specify

1

,

2

, or

3

, where:

1

=

¦ (dot; default)

2

=

› (box)

3

=

+

(cross)

Pt-On(x,y[,mark])

Pt-Off(x,y[,mark])

Pt-Change(x,y)

Note:

If you specified

mark

to turn on a point with

Pt-On(

, you must specify

mark

when you turn off the point with

Pt-Off(

.

Pt-Change(

does not have the

mark

option.

Drawing Pixels

TI-84 Plus Pixels

A pixel is a square dot on the TI-84 Plus display. The

Pxl-

(pixel) instructions let you turn on, turn off, or reverse a pixel (dot) on the graph using the cursor. When you select a pixel instruction from

Chapter 8: Draw Instructions 131

the

DRAW POINTS

menu, the TI-84 Plus returns to the home screen or the program editor. The pixel instructions are not interactive.

Turning On and Off Pixels with Pxl-On( and Pxl-Off(

Pxl-On(

(pixel on) turns on the pixel at (

row

,

column

), where

row

is an integer between 0 and 62 and

column

is an integer between 0 and 94.

Pxl-Off(

turns the pixel off.

Pxl-Change(

toggles the pixel on and off.

Pxl-On(row,column)

Pxl-Off(row,column)

Pxl-Change(row,column)

Using pxl-Test( pxl-Test(

(pixel test) returns 1 if the pixel at (

row,column

) is turned on or 0 if the pixel is turned off on the current graph.

row

must be an integer between 0 and 62.

column

must be an integer between 0 and 94.

pxl-Test(row,column)

Split Screen

On a

Horiz

split screen, the maximum value for

row

is 30 for

Pxl-On(

,

Pxl-Off(

,

Pxl-Change(

, and

pxl-Test(

.

On a

G-T

split screen, the maximum value for

row

is 50 and the maximum value for

column

is 46 for

Pxl-On(

,

Pxl-Off(

,

Pxl-Change(

, and

pxl-Test(

.

Chapter 8: Draw Instructions 132