log1p man page on OpenDarwin

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LOG(3)			 BSD Library Functions Manual			LOG(3)

NAME
     log, log2, log10, log1p, — logarithm functions

SYNOPSIS
     #include <math.h>

     double
     log(double x);

     double
     log2(double x);

     double
     log10(double x);

     double
     log1p(double x);

DESCRIPTION
     The log() function computes the value of the natural logarithm of argu‐
     ment x.

     The log2() function computes the value of the logarithm of argument x to
     base 2.

     The log10() function computes the value of the logarithm of argument x to
     base 10.

     The log1p() function computes the value of log(1+x) accurately even for
     very small values of x.

SPECIAL VALUES
     log(�0) , log2(�0) , and log10(�0) return -infinity and raise the
     "divide-by-zero" floating-point exception.

     log(1) , log2(1) , and log10(1) return +0.

     log(x) , log2(x) , and log10(x) return a NaN and raise the "invalid"
     floating-point exception for x < 0.

     log(+infinity) , log2(+infinity) , and log10(+infinity) return +infinity.

     log1p(�0) returns �0.

     log1p(-1) returns -infinity and raises the "divide-by-zero" floating-
     point exception.

     log1p(x) returns a NaN and raises the "invalid" floating-point exception
     for x < -1.

     log1p(+infinity) returns +infinity.

SEE ALSO
     math(3), exp(3), exp2(3), expm1(3), pow(3), infnan(3)

STANDARDS
     The log() , log2() , log10() , and log1p() functions conform to ISO/IEC
     9899:1999(E).

4th Berkeley Distribution	 July 2, 2003	     4th Berkeley Distribution
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