Museum

  ERF(3M)                  (Math Libraries)                 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).




















  Page 1                                                   May 1989