erff(3M)

Name

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:

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(??) * 2 is returned.

Attributes

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

See also

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