double
erf(double x)
float
erff(float x)
double
erfc(double x)
float
erfcf(float x)
x.
The
erf()
calculates the error function of x; where
erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.
The
erfc()
function calculates the complementary error function of
x;
that is
erfc()
subtracts the result of the error function
erf(x)
from 1.0.
This is useful, since for large
x
places disappear.
)
and
erfc()
functions appeared in
4.3BSD.