ERFC(3M) Mathematical Library Functions ERFC(3M)

erfc, erfcf, erfcl - complementary error function

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double erfc(double x);

float erfcf(float x);

long double erfcl(long double x);

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

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.

No errors are defined.

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.

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

Interface Stability Standard
MT-Level MT-Safe

math.h(3HEAD), erf(3M), isnan(3M), attributes(7), standards(7)

July 12, 2006 SunOS 5.11