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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
]