ERF(3M-SVR4)        RISC/os Reference Manual         ERF(3M-SVR4)



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 returns the error function of x, defined as

          _2_x -t2
            _∫e   dt
          \|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).






























                        Printed 11/19/92                   Page 1