Operation Manual

Function Graphing 3-5

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

12:36 PM Page 5 of 24

Defining Functions in the Y= List

Pressing

accesses the Y= edit screen, where you enter the functions to graph.

You can store up to ten functions in memory at one time. You can graph one or

more of these functions at a time.

Displaying the Functions in the Y= List

Press

to display the

edit screen. In the example below, the

and

functions are defined.

Defining a New Function

To define a new function, enter an expression on the

edit screen.

1. Move the cursor to the function in the

list you want to define. If

necessary, press

‘

to erase a previously entered function.

2. Enter the expression to define the function.

You may use functions and variables (including matrices and lists) in

the expression. If the expression evaluates to a value that is not a

real number, that point is not plotted; an error does not occur.

The independent variable in the function is

. You may press

„

rather than pressing

, for the

variable. (

Func

MODE

defines the independent variable as

The expression is stored as one of the ten user-defined functions in

the

list as you enter it.

3. When you complete the expression, press

to move to the

beginning of the next function.