HP 40gs Manual do Utilizador descarregar pdf (Página 171)

100

101

Using mathematical functions 13-17

Examples

SIGN (–2) returns –1

SIGN((3,4)) returns (.6,.8)

TRUNCATE Truncates value to decimal places. Accepts complex

numbers.

TRUNCATE(value, places)

Example

TRUNCATE(2.3678,2) returns 2.36

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 13-19.)

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)

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