Texas Instruments TI-89 Titanium User Manual

Operating the Calculator 188
Displaying a Variable
If the variable is undefined, the variable name is shown in the result.
Using a Variable in an Expression
1. Type the variable name.
2. Press ¸.
In this example, the variable a is undefined.
Therefore, it is used as a symbolic variable.
Note: Refer to Symbolic Manipulation for
information about symbolic manipulation.
1. Type the variable name into the
expression.
2. Press ¸ to evaluate the expression.
Note: To view a list of existing variable
names, use 2 ° as described in
Memory and Variable Management.
If you want the result to replace the variable’s
previous value, you must store the result.
The variable’s value
did not change.

Texas Instruments TI-89 Titanium Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
CPU	Motorola 68000
CPU Speed	16 MHz
RAM	256 KB
Flash ROM	2.7 MB
Programming Language	TI-BASIC, Assembly
Power Source	4 AAA batteries
Connectivity	I/O port
Dimensions	7.5 x 3.5 x 1 inches