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Function Graphing 3-7

8203FUNC.DOC TI-82, Chapter 3, English Bob Fedorisko Revised: 02/09/01 9:06 AM Printed: 02/09/01

12:36 PM Page 7 of 24

Selecting Functions

Only functions that are selected are graphed. Up to ten functions may be selected

at one time.

Turning a Function “On” or “Off”

You select and deselect (“turn on” and “turn off”) functions on the

edit

screen. The = sign on a selected function is highlighted. To change the

selection status of a function:

1. If the

edit screen is not displayed, press

to display the functions.

2. Move the cursor to the function whose status you want to change.

3. Use

to place the cursor over the

sign of the function.

4. Press

to change the status.

Note: When you enter or edit a function, it is selected automatically. When

you clear a function, it is deselected.

Leaving the Y= Edit Screen

To leave the

edit screen:

Select another screen by pressing the appropriate key, such as

Press

QUIT

to return to the Home screen.

Selecting Functions from the Home Screen or a Program

1. Begin on a blank line. Press

VARS

and select

On/Off...

. The

ON/OFF

menu is displayed.

2. Select the instruction you want,

FnOn

FnOff

. It is copied to the

cursor location.

3. If you want to turn specific functions on or off, enter the number of the

function(s), separated by commas.

When the instruction is executed, the status of each function in the current

graph mode is set appropriately and

Done

is displayed.

FnOn

FnOff

FnOn

function1

function2

. . .

FnOff

function1

function2

. . .

For example, in

Func

MODE

FnOff:FnOn 1,3

turns off all functions in the

list and then turns on

and