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log(3) -- Linux man page
NAME
log, logf, logl - natural logarithmic function
SYNOPSIS
#include <math.h>
double log(double x);
float logf(float x);
long double logl(long double x);
DESCRIPTION
The log() function returns the natural logarithm of x.
ERRORS
The log() function can return the following errors:
- EDOM
-
The argument x is negative.
- ERANGE
-
The argument x is zero. The log of zero is not defined
(minus infinity).
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899.
The float and the long double variants are C99 requirements.
SEE ALSO
sqrt(3),
cbrt(3)
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