LOG1P(3) NEWLIB LOG1P(3)NAME
1.35 `log1p', `log1pf'--log of `1 + X'
SYNOPSIS
#include <math.h>
double log1p(double X);
float log1pf(float X);
DESCRIPTION
`log1p' calculates the natural logarithm of `1+X'. You can use `log1p'
rather than ``log(1+X)'' for greater precision when X is very small.
`log1pf' calculates the same thing, but accepts and returns `float'
values rather than `double'.
RETURNS
`log1p' returns a `double', the natural log of `1+X'. `log1pf' returns
a `float', the natural log of `1+X'.
PORTABILITY
Neither `log1p' nor `log1pf' is required by ANSI C or by the System V
Interface Definition (Issue 2).
SEE ALSO
log1p is part of the library. The full documentation for is maintained
as a Texinfo manual. If info and are properly installed at your site,
the command
info
will give you access to the complete manual.
NEWLIB April 2010 LOG1P(3)
