ERF(3) Library Functions Manual ERF(3) NAME erf, erff, erfl, erfc, erfcf, erfcl -- error function operators LIBRARY Math Library (libm, -lm) SYNOPSIS #include <math.h> double erf(double x); float erff(float x); long double erfl(long double x); double erfc(double x); float erfcf(float x); long double erfcl(long double x); DESCRIPTION These functions calculate the error function of x. The erf(), erff(), and erfl() functions calculate the error function of x; where erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt. The erfc(), erfcf(), and erfcl() functions calculate the complementary er- ror function of x; that is erfc() subtracts the result of the error func- tion erf(x) from 1.0. SEE ALSO math(3) STANDARDS The erf(), erff(), erfl(), erfc(), erfcf() and erfcl() functions conform to ISO/IEC 9899:1999 ("ISO C99"). HISTORY The erf() and erfc() functions appeared in 4.3BSD. FreeBSD 15.1 June 23, 2024 ERF(3)
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