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



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(-tt) dt. erf(x) := (2/v/pi)I₀₀^x⁰exp(-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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