erf(3m)                    DG/UX 4.30                     erf(3m)



     NAME
          erf, erfc - error function and complementary error function

     SYNOPSIS
          #include <math.h>

          double erf (x)
          double x;

          double erfc (x)
          double x;

     DESCRIPTION                                             x
          erf returns the error function of x, defined as _2∫e-t2dt.
                                                          \|π0

          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).
































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