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.