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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
"
!
Y
n
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