LOG(3) Linux Programmer's Manual LOG(3)[top]NAMElog, logf,logl- natural logarithmic functionSYNOPSIS#include <math.h> double log(double x); float logf(float x); long double logl(long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): logf(), logl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99-lm.DESCRIPTIONThe log() function returns the natural logarithm of x.RETURN VALUEOn success, these functions return the natural logarithm of x. If x is a NaN, a NaN is returned. If x is 1, the result is +0. If x is positive infinity, positive infinity is returned. If x is zero, then a pole error occurs, and the functions return,-HUGE_VAL, or-HUGE_VALF, respectively. If x is negative (including negative infinity), then a domain error occurs, and a NaN (not a number) is returned.-HUGE_VALLERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is negative errno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised. Pole error: x is zero errno is set to ERANGE. A divide-by-zero floating-point excepâ tion (FE_DIVBYZERO) is raised.CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.BUGSIn glibc 2.5 and earlier, taking the log() of a NaN produces a bogus invalid floating-point (FE_INVALID) exception.SEE ALSOcbrt(3), clog(3), log10(3), log1p(3), log2(3), sqrt(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/. 2010-09-20 LOG(3)

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