# erfc(3m) [bsd man page]

```ERF(3M) 																   ERF(3M)

NAME
erf, erfc - error functions

SYNOPSIS
#include <math.h>

double erf(x)
double x;

double erfc(x)
double x;

DESCRIPTION
Erf(x) returns the error function of x; where

erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.

Erfc(x) returns 1.0-erf(x).

The  entry  for erfc is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result subtracted
from 1.	(e.g. for x = 10, 12 places are lost).

math(3M)

4.3 Berkeley Distribution					   May 12, 1986 							   ERF(3M)```

## Check Out this Related Man Page

```erfc(3M)						  Mathematical Library Functions						  erfc(3M)

NAME
erfc, erfcf, erfcl - complementary error function

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

double erfc(double x);

float erfcf(float x);

long double erfcl(long double x);

DESCRIPTION
These function compute the complementary error function 1.0 - erf(x).

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

If x is NaN, a NaN is returned.

If x is +-0, +1 is returned.

If x is -Inf, +2 is returned.

If x is +Inf, 0 is returned.

ERRORS
No errors are defined.

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	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+