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home | helpERF(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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