log1p man page on Scientific

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

       log1p, log1pf, log1pl -	logarithm of 1 plus argument

       #include <math.h>

       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(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
       _ISOC99_SOURCE; or cc -std=c99
       log1pf(), log1pl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
       || _ISOC99_SOURCE; or cc -std=c99

       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

       On success, these functions return the natural logarithm of (1 + x).

       If x is a NaN, a NaN is returned.

       If x is positive infinity, positive infinity is returned.

       If x is -1, a pole error occurs, and the	 functions  return  -HUGE_VAL,
       -HUGE_VALF, or -HUGE_VALL, respectively.

       If  x  is  less	than  -1 (including negative infinity), a domain error
       occurs, and a NaN (not a number) is returned.

       See 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 less than -1
	      An invalid floating-point exception (FE_INVALID) is raised.

       Pole error: x is -1
	      A	 divide-by-zero	 floating-point	 exception  (FE_DIVBYZERO)  is

       These functions do not set errno.

       C99, POSIX.1-2001.

       exp(3), expm1(3), log(3)

       This page is part of release 3.22 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/.

				  2008-08-05			      LOG1P(3)

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