ERF Section: Linux Programmer's Manual (3) Updated: June 25, 2025 Index   NAME erf, erfc - error function and complementary error function   SYNOPSIS #include <math.h> double erf(double x); double erfc (double x);   DESCRIPTION The erf() function returns the error function of x; defined as erf(x) = 2/sqrt(pi)* integral from 0 to x of exp(-t*t) dt The erfc() function returns the complementary error function of x, that is 1.0 - erf(x).   CONFORMING TO SVID 3, BSD 4.3   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:03 GMT, March 24, 2025