ERF(S)                   XENIX System V                    ERF(S)



     Name
          erf, erfc - Error function and complementary error function.

     Syntax
          #include <math.h>

          double erf (x)
          double x;

          double erfc (x)
          double x;
                                                           x
     Description                                             -t2
                                                           _e   dt.
          erf returns the error function of x, defined as   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(S)

     Notes
          These routines must be linked by using the -lm linker
          option.



























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