DragonFly On-Line Manual Pages

ERFC(3)               DragonFly Library Functions Manual               ERFC(3)

NAME
     erf, erff, erfl, erfc, erfcf, erfcl -- error function operators

SYNOPSIS
     #include <math.h>

     double
     erf(double x);

     float
     erff(float x);

     long double
     erfl(long double x);

     double
     erfc(double x);

     float
     erfcf(float x);

     long double
     erfcl(long double x);

DESCRIPTION
     These functions calculate the error function of x.

     The erf() calculates the error function of x, and the erff() and erfl()
     functions are single and double precision versions of erf().  The error
     function is defined as:

           erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.

     The erfc() function calculates the complementary error function of x;
     that is erfc() subtracts the result of the error function erf(x) from
     1.0.  This is useful, since for large x places disappear.  The erfcf()
     and erfcl() functions are single and double precision version of erfc().

SEE ALSO
     exp(3)

HISTORY
     The erf() and erfc() functions appeared in 4.3BSD.

DragonFly 4.1                    June 5, 2013                    DragonFly 4.1