Texas Instruments TI-89 Manual Book page 77

Deleting a Defined
Variable
Note: For information about
folders, refer to Chapter 5.
Temporarily
Overriding a
Variable
Note: For more information
about the | operator, refer to
page 67.
60 Chapter 3: Symbolic Manipulation
You can "undefine" a defined variable by deleting it.
To delete:
One or more specified
variables
All one-letter variables
( – ) in the current
a z
folder
By using the "with" operator ( | ), you can:
¦
Temporarily override
a variable's defined
value.
¦
Temporarily define a
value for an undefined
variable.
To type the "with" operator ( | ), press:
. Í
TI 89:
. 2 Í
TI 92 Plus:
Do this:
Use the function.
DelVar
You can also delete variables by using the
screen ( 2 °) as
VAR-LINK
described in Chapter 21.
From the Home screen
select 1: . You will be prompted to
Clear a-z
press ¸ to confirm the deletion.
Clean Up menu,