erf(), erff(), erfc(), erfcf() error function operators	Function
	SYNOPSIS DESCRIPTION PARAMETERS RETURN VALUES CONFORMANCE MULTITHREAD SAFETY LEVEL PORTING ISSUES AVAILABILITY SEE ALSO

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SYNOPSIS

#include <math.h>

double erf(double x)

float erff(float x)

double erfc(double x)

float erfcf(float x)

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DESCRIPTION

The erf() function computes the error function of x, defined as:

The erfc() function calculates the complementary error function of x; that is erfc() subtracts the result of the error function erf(x) from 1.0. This is useful, since for large x places disappear.

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PARAMETERS

x 

Specifies order of error function.

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RETURN VALUES

On success, these functions return the value of the error function as defined above.

If x is NaN, NaN is returned.

If the correct value would cause underflow, 0 is returned.

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CONFORMANCE

UNIX 98.

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MULTITHREAD SAFETY LEVEL

MT-Safe.

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PORTING ISSUES

None.

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AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

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SEE ALSO

Functions:

math()

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PTC MKS Toolkit 10.4 Documentation Build 39.