Calculator User Manual

906 Appendix A: Functions and Instructions
≤
≤≤
≤ 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
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
]