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LOG1P(3)                   Linux Programmer's Manual                  LOG1P(3)



NAME
       log1p, log1pf, log1pl -  logarithm of 1 plus argument

SYNOPSIS
       #include <&lt;math.h>&gt;

       double log1p(double x);
       float log1pf(float x);
       long double log1pl(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       log1p(), log1pf(), log1pl(): _BSD_SOURCE || _SVID_SOURCE ||
       _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
       log1p(x) returns a value equivalent to

           log (1 + x)

       It is computed in a way that is accurate even if the value of x is near
       zero.

CONFORMING TO
       BSD, C99.  The float and long double variants are C99 requirements.

SEE ALSO
       exp(3), expm1(3), log(3)

COLOPHON
       This  page  is  part of release 3.05 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/.



                                  2007-07-26                          LOG1P(3)