Deleting a defined variable, Temporarily overriding a variable – Texas Instruments PLUS TI-89 User Manual

Page 77

60 Chapter 3: Symbolic Manipulation

03SYMBOL.DOC TI-89/TI-92 Plus: Symbolic Manipulation (English) Susan Gullord Revised: 02/23/01 10:52 AM Printed: 02/23/01 2:12 PM Page 60 of 24

You can “undefine” a defined variable by deleting it.

To delete:

Do this:

One or more specified
variables

Use the

DelVar

function.

You can also delete variables by using the

VAR-LINK

screen (

2 °) as

described in Chapter 21.

All one-letter variables
(

–

) in the current

folder

From the Home screen

Clean Up

menu,

select 1:

Clear a

. You will be prompted to

press ¸ to confirm the deletion.

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:

89:

92 Plus:

2 Í

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.

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