Texas-instruments PLUS TI-89 User Manual download pdf (Page 65)

100

101

48 Chapter 2: Operating the Calculator

02OPER.DOC TI

89/TI

92 Plus: O

erating the TI

89/TI

92 Plus (English) Susan Gullord Revised: 02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 48 of 44

1. Enter the value you want to store, which can be an expression.

2. Press

. The store symbol (

) is displayed.

3. Type the variable name.

4. Press

To store to a variable temporarily, you can use the “with” operator.

Refer to “Substituting Values and Setting Constraints” in Chapter 3.

1. Type the variable name.

2. Press

If the variable is undefined, the variable name is shown in the result.

In this example, the variable

undefined. Therefore, it is used as a

symbolic variable.

1. Type the variable name into the

expression.

2. Press

to evaluate the

expression.

If you want the result to replace the

ariable’s previous value, you must

store the result.

In some cases, you may want to use a variable’s actual value in an

expression instead of the variable name.

1. Press

2£

to display a dialog

box.

2. Type the variable name.

3. Press

twice.

In this example, the value stored in

num1

will be inserted at the

cursor position in the entry line.

Storing a Value in a

Variable

Note:

users should

use

as necessary

when typing variable names.

Displaying a

Variable

Note: Refer to Chapter 3 for

information about symbolic

manipulation.

Using a Variable in

an Expression

Tip: To view a list of existin

variable names, use

2°

as described in

Chapter 21.

Recalling a

Variable’s Value

The variable’s value

did not change.

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Texas-instruments PLUS TI-89 User Manual Page 65

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