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Command: erf | Section: 3 | Source: Digital UNIX | File: erf.3.gz
erf(3) Library Functions Manual erf(3)
NAME
erf, erfc - Error functions
LIBRARY
Math Library (libm.a)
SYNOPSIS
#include <math.h>
double erf (double x); float erff (float x); double erfc (double
x); float erfcf (float x);
STANDARDS
Interfaces documented on this reference page conform to industry stan-
dards as follows:
erf(): XPG4
erfc(): XPG4
Refer to the standards(5) reference page for more information about in-
dustry standards and associated tags.
DESCRIPTION
The erf() and erff() functions return the error function of x, where
erf(x) and erff(x) equal (2/sqrt(pi)) times the area under the curve
e**(-t**2) between 0 and x.
The erfc() and erfcf() functions return (1.0 - erf(x)). The erfc()
function can result in an underflow as x gets large.
delim off
erf(3)