erfcf man page on OpenBSD

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ERFC(3)			  OpenBSD Programmer's Manual		       ERFC(3)

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

SYNOPSIS
     #include <math.h>

     double
     erf(double x);

     float
     erff(float x);

     double
     erfc(double x);

     float
     erfcf(float x);

DESCRIPTION
     These functions calculate the error function of x.

     The erf() calculates the error function of x, and the erff() function is
     a single precision version 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()
     function is a single precision version of erfc().

SEE ALSO
     math(3)

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

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9
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