4-6 Function Graphing
To edit a function in the Y= list:
1. Press ( to display the Y= list, and move the cursor to the
function you want to change.
2. Make the changes. You can also press M to erase the
expression, and then enter a new expression.
The expression is stored in the Y= list and selected (turned
on) as you edit it.
To clear or erase a function on the Y= edit screen, position the
cursor anywhere on the function, and then press M.
To define a function from the Home screen or from a program,
begin on a blank line.
1. Press ? ã"ä, enter the expression, and then press
? ã"ä again.
2. Press §.
3. Press 2 G, and then select the name of the function
from the Y menu. The name is copied to the cursor
location.
4. Press ¸ to complete the instruction.
"expression"!Yn
When the instruction is executed, the TI-80 stores the
expression in the Y= list, selects (turns on) the function, and
displays the message DONE.
To leave the Y= edit screen:
¦Select another screen by pressing the appropriate key,
such as , or ).
¦Press 2 . to return to the Home screen.
Editing a
Function
Clearing a
Function
Defining
Functions from
the Home Screen
or a Program
Leaving the Y=
Edit Screen