ERF(3) Linux Programmer's Manual ERF(3)[top]NAMEerf, erff, erfl, - error functionSYNOPSIS#include <math.h> double erf(double x); float erff(float x); long double erfl(long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): erf(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 erff(), erfl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99-lm.DESCRIPTIONThe erf() function returns the error function of x, defined as erf(x) = 2/sqrt(pi)* integral from 0 to x of exp(-t*t) dtRETURN VALUEOn success, these functions return the error function of x, a value in the range [, 1]. If x is a NaN, a NaN is returned. If x is +0 (-0), +0 (-0) is returned. If x is positive infinity (negative infinity), +1 (-1) is returned. If x is subnormal, a range error occurs, and the return value is 2*x/sqrt(pi).-1ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Range error: result underflow (x is subnormal) An underflow floating-point exception (FE_UNDERFLOW) is raised. These functions do not set errno.CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD.SEE ALSOcerf(3), erfc(3), exp(3)COLOPHONThis page is part of release 3.54 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.GNU2010-09-20 ERF(3)

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