Content-type: text/html Man page of erf

erf

Section: Mathematical Library Functions (3M)
Updated: 12 Jul 2006
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NAME

erf, erff, erfl - error function  

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double erf(double x);

float erff(float x);

long double erfl(long double x);  

DESCRIPTION

These functions compute the error function of their argument x, defined as: delim $$

2/sqrt(pi)\(**\|integral from 0 to x of exp(\-t\(**t) dt

Equation that computes error function of x.  

RETURN VALUES

Upon successful completion, these functions return the value of the error function.

If x is NaN, a NaN is returned.

If x is ±0, ±0 is returned.

If x is ±Inf, ±1 is returned.

If x is subnormal, 2/sqrt(pi) * 2 is returned.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

erfc(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:39:32 GMT, October 02, 2010