XPON

Exponent of value.

 

XPON(value)

 

Example

 

XPON(123.4) returns 2

Two-variable statistics

These are functions for use with two-variable statistics.

See “Two-variable” on page 10-15.

Symbolic functions

 

The symbolic functions are used for symbolic

 

manipulations of expressions. The variables can be

 

formal or numeric, but the result is usually in symbolic

 

form (not a number). You will find the symbols for the

 

symbolic functions = and (where) in the CHARS menu

 

(

CHARS) as well as the MATH menu.

= (equals)

Sets an equality for an equation. This is not a logical

 

operator and does not store values. (See “Test functions”

 

on page 13-18.)

 

 

expression1=expression2

ISOLATE

Isolates the first occurrence of variable in expression=0

 

and returns a new expression, where

 

variable=newexpression. The result is a general solution

 

that represents multiple solutions by including the (formal)

 

variables S1 to represent any sign and n1 to represent

 

any integer.

 

 

ISOLATE(expression, variable)

 

Examples

 

 

ISOLATE(2*X+8,X) returns -4

 

 

ISOLATE(A+B*X/C,X) returns -(A*C/B)

LINEAR?

Tests whether expression is linear for the specified

variable. Returns 0 (false) or 1 (true). LINEAR?(expression, variable)

Example

LINEAR?((X^2-1)/(X+1),X) returns 0

Using mathematical functions

13-17