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man pages section 3: Extended Library Functions, Volume 2

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Updated: Thursday, June 13, 2019
 
 

erfl(3M)

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:

image:Equation that computes error function of x.

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

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(π) * 2 is returned.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Availability
system/library/math
MT-Level
MT-Safe
Standard

See Also

math.h(3HEAD), erfc(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), attributes(7), standards(7)