Syntax 1: For all objects

Description

Determines the natural logarithm of a number.

Syntax

Log ( n )

Log ( n )

Argument	Description
n	The number for which you want the natural logarithm (base e). The value of n must be greater than 0.

Return value

Double.

Returns the natural logarithm of n. An execution error occurs if n
is negative or zero. If n is null, Log returns null.

The inverse of the Log function is the Exp function.

Examples

This statement returns 2.302585092:

Log(10)

Log(10)

This statement returns -.693147. . .:

Log(0.5)

Log(0.5)

Both these statements result in an error at runtime:

Log(0)
Log(-2)

1 2	Log(0) Log(-2)

After the following statements execute, the value of a is
200:

double a, b =  Log(200)
a = Exp(b)// a = 200

1 2	double a, b = Log(200) a = Exp(b)// a = 200

See also

Exp

Log method for DataWindows in the section called “Log” in DataWindow Reference.

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Powerbuilder Documentation 2019

PB Docs 2019 Powerbuilder Documentation 2019

August 21, 2023

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