Texas Instruments TI-89 Titanium User Manual

Appendix A: Functions and Instructions 879
≤ ¹µkey
expression1 ≤ expression2 ⇒ Boolean expression
list1
≤ list2 ⇒ Boolean list
matrix1
≤ matrix2 ⇒ Boolean matrix
Returns true if expression1 is determined to be less
than or equal to
expression2 .
Returns
false if expression1 is determined to be
greater than
expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons element
by element.
See "=" (equal) example.
> 2Ãkey
expression1 > expression2 ⇒ Boolean expression
list1
> list2 ⇒ Boolean list
matrix1
> matrix2 ⇒ Boolean matrix
Returns true if expression1 is determined to be
greater than
expression2 .
Returns
false if expression1 is determined to be less
than or equal to
expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons element
by element.
See "=" (equal) example.
≥ ¹¶key
expression1 ≥ expression2 ⇒ Boolean expression
list1
≥ list2 ⇒ Boolean list
matrix1
≥ matrix2 ⇒ Boolean matrix
Returns true if expression1 is determined to be
greater than or equal to
expression2 .
Returns
false if expression1 is determined to be less
than
expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons element
by element.
See "=" (equal) example.
!
(factorial)
@ ¥ e key H 2 W key
expression1 ! ⇒ expression
list1
! ⇒ list
matrix1
! ⇒ matrix
Returns the factorial of the argument.
For a list or matrix, returns a list or matrix of
factorials of the elements.
The TI
- 89 computes a numeric value for only non-
negative whole-number values.
5! ¸ 120
{5,4,3}!
¸ {120 24 6}
[1,2;3,4]!
¸ [
1 2
6 24
]

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