Texas Instruments TI-89 Titanium User Manual

Symbolic Manipulation 226
Temporarily Overriding a Variable
By using the
“with” operator ( | ), you can:
Note: For more information about the | operator, refer to Typing the “With” Operator.
To type the
“with” operator ( | ), press:
@ Í
Using Exact, Approximate, and Auto Modes
The Exact/Approx mode settings, which are described briefly in Operating the Handheld,
directly affect the precision and accuracy with which the TI-89 Titanium calculates a
result. This section describes these mode settings as they relate to symbolic
manipulation.
EXACT Setting
When Exact/Approx = EXACT, the handheld uses exact rational arithmetic with up to
614 digits in the numerator and 614 digits in the denominator. The EXACT setting:
• Temporarily override a variable’s defined
value.
• Temporarily define a value for an
undefined variable.

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