- Hewlett-Packard Graphing Calculator User's Guide

10-20 Using mathematical functions
QUOTE Encloses an expression that should not be evaluated
numerically.
QUOTE(expression)
Examples
QUOTE(SIN(45)) F1(X) stores the expression
SIN(45) rather than the value of SIN(45).
Another method is to enclose the expression in single
quotes.
For example, X^3+2*X
F1(X) puts the
expression X^3_2*X into F1(X) in the Function aplet.
| ( where ) Evaluates expression where each given variable is set to the
given value. Defines numeric evaluation of a symbolic
expression.
expression|(variable1=value1, variable2=value2,...)
Example
3*(X+1)|(X=3) returns 12.
Test functions
The test functions are logical operators that always return
either a 1 (true) or a 0 (false).
< Less than. Returns 1 if true, 0 if false.
value1<value2
≤ Less than or equal to. Returns 1 if true, 0 if false.
value1≤value2
= = Equals (logical test). Returns 1 if true, 0 if false.
value1==value2
≠ Not equal to. Returns 1 if true, 0 if false.
value1≠value2
> Greater than. Returns 1 if true, 0 if false.
value1>value2
≥ Greater than or equal to. Returns 1 if true, 0 if false.
value1≥value2