erf(3M)
NAME
erf, erfc − error and complementary error functions
SYNOPSIS
cc [ flag ... ] file ... −lm [ library ... ]
#include <math.h>
double erf(double x);
double erfc(double x);
DESCRIPTION
The erf() function computes the error function of x, defined as:
2 over √πx∫0e−t2dt
The erfc() function computes 1.0 − erf(x).
RETURN VALUES
Upon successful completion, erf() and erfc() return the value of the error function and complementary error function, respectively.
If x is NaN, NaN is returned.
ERRORS
No errors will occur.
USAGE
The erfc() function is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result subtracted from 1.0.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe |
SEE ALSO
SunOS 5.6 — Last change: 29 Dec 1996