erf(3M)               MATHEMATICAL LIBRARY                erf(3M)



NAME
     erf, erfc - error function and complementary error function

SYNOPSIS
     cc [flag ...] file ...  -lm [library ...]

     #include <math.h>

     double erf (double x);

     double erfc (double x);

DESCRIPTION
     erf retur
xns the error function of x, defined as
           2     2
          ___∫e-t dt
          \/π
             0
     erfc, which returns 1.0 - erf(x), 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 (e.g., for x = 5,
     12 places are lost).

SEE ALSO
     exp(3M).






























                   Last change: Math Libraries                  1