Texas Instruments TITANIUM TI-89 - Manual (Page 905)

Appendix A: Functions and Instructions 905
= (equal) Á key
expression1 = expression2 ⇒ ⇒ ⇒ ⇒ Boolean expression
list1 = list2 ⇒ ⇒ ⇒ ⇒ Boolean list
matrix1 = matrix2 ⇒ ⇒ ⇒ ⇒ Boolean matrix
Returns true if expression1 is determined to be
equal to expression2 .
Returns false if expression1 is determined to not be
equal to expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons
element by element.
Example function listing using math test
symbols: =,
ƒ, <, , >, ‚
:g(x)
:Func
:If xë 5 Then
: Return 5
: ElseIf x>ë 5 and x<0 Then
: Return ë x
: ElseIf x‚0 and xƒ10 Then
: Return x
: ElseIf x=10 Then
: Return 3
:EndIf
:EndFunc
Graph g(x) ¸
≠≠≠≠
¥ Á key
expression1 ≠≠≠≠ expression2 ⇒ ⇒ ⇒ ⇒ Boolean expression
list1 ≠≠≠≠ list2 ⇒ ⇒ ⇒ ⇒ Boolean list
matrix1 ≠≠≠≠ matrix2 ⇒ ⇒ ⇒ ⇒ Boolean matrix
Returns true if expression1 is determined to be not
equal to expression2 .
Returns false if expression1 is determined to be
equal to expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons
element by element.
See "=" (equal) example.
< 2 Â key
expression1 < expression2 ⇒ ⇒ ⇒ ⇒ Boolean expression
list1 < list2 ⇒ ⇒ ⇒ ⇒ Boolean list
matrix1 < matrix2 ⇒ ⇒ ⇒ ⇒ Boolean matrix
Returns true if expression1 is determined to be less
than expression2 .
Returns false if expression1 is determined to be
greater 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.