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erf, erff, erfl, erfc, erfcf, erfcl -
error function and complementary error function
#include <math.h>
double erf(double x);
float erff(float x);
long double erfl(long double x);
double erfc(double x);
float erfcf(float x);
long double erfcl(long double x);
The erf() function returns the error function of x; defined
as
- erf(x) = 2/sqrt(pi)
* integral from 0 to x of exp(-t*t) dt
The erfc()
function returns the complementary error function of x, that is 1.0 - erf(x).
SVID 3, BSD 4.3, C99. The float and long double variants are
requirements of C99.
exp(3)
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