erf(3) - NetBSD Manual Pages

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ERF(3)                  NetBSD Library Functions Manual                 ERF(3)


NAME

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


LIBRARY

     Math Library (libm, -lm)


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; where

           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.


SEE ALSO

     math(3)


HISTORY

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

NetBSD 7.1                     November 7, 2015                     NetBSD 7.1