Manual Texas Instruments TI-80 (page 79 of 235) (English)

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Function Graphing 4-5

Pressing

(

displays the Y= edit screen. This is where you enter the functions to

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

one or more of these functions at a time.

Press

(

to display the

edit screen. In the example below,

the

and

functions are defined.

To define a new function in the

list:

1. Press

(

to display the

edit screen.

2. Move the cursor to the function in the

list you want to

define. If necessary, press

to erase a previously

entered function.

3. Enter the expression to define the function.

You may use functions and variables 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

, to enter the

variable. (

FUNC

mode defines the independent variable

The expression is stored as one of the four user-defined

functions in the

list as you enter it.

Note: You can use a list within a

function; however,

the function must evaluate to a single value.

4. When you complete the expression, press

to move

to the beginning of the next function.

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

for graphing in the

list. This is indicated by the highlighted

equal sign. For details on selecting and deselecting functions,

see page 4

Defining Functions in the Y= List

Displaying the

Functions in the

Y= List

Defining a New

Function

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Texas Instruments TI-80 Manual

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