Texas Instruments TI-89 Titanium - Page 277

Appendix A: Functions and Instructions 271
≤ 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
]