Texas Instruments PLUS TI-89 - Manual (Page 546)

Appendix A: Functions and Instructions 529
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 529 of 132
= (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.