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ERF(3)			    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(), erff(), and erfl() functions calculate the error function of
       x; where

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

       The  erfc(), erfcf(), and erfcl() functions calculate the complementary
       error function of x; that is erfc() subtracts the result	of  the	 error
       function	erf(x) from 1.0.

SEE ALSO
       math(3)

STANDARDS
       The  erf(),  erff(), erfl(), erfc(), erfcf() and	erfcl()	functions con-
       form to ISO/IEC 9899:1999 ("ISO C99").

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

FreeBSD	14.3			 June 23, 2024				ERF(3)

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