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ERF (3) | C library functions | Unix Manual Pages | :man

NAME

erf, erff, erfc, erfcf - error function operators

CONTENTS

Library
Synopsis
Description
See Also
History

LIBRARY


.Lb libm

SYNOPSIS


.In 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 and the erff functions calculate the error function of x; where


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


erf(x) :=
(2/v/pi)I00x0exp(-t20)dt.


The erfc and the erfcf functions calculate 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


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