erfc man page on Minix

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ERF(3)			 BSD Library Functions Manual			ERF(3)

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

LIBRARY
     Math Library (libm, -lm)

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; 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.

BSD				April 20, 1991				   BSD
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