hpux man page for log1pd64

log1pd64(3M)															      log1pd64(3M)

NAME
       log1pd64(), log1pd128(), log1pd32() - decimal natural logarithm of one-plus-argument functions

SYNOPSIS
DESCRIPTION
       The function computes the logarithmic function but may be more accurate for very small values of x.

       The and functions are useful to guarantee that financial calculations of (((1+x)**n)-1)/x are accurate when x is very small, namely:

       The preceding example might be applicable when calculating small daily interest rates.

       is a version of it takes a argument and returns a result.

       is a version of it takes a argument and returns a result.

       These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.

USAGE
       To use any of these functions, compile with the option.

       Make sure your program defines and then includes

       Link in the math library by specifying or on the linking command line.

       For more information, see the at the following site:

RETURN VALUE
       If x is +infinity, returns +infinity.

       If x is -1, returns -infinity and raises the divide-by-zero exception.

       If x is less than -1, returns NaN and raises the invalid exception.

       If x is NaN, returns NaN.

       raises the inexact exception whenever a rounded result does not equal the mathematical result.

ERRORS
       If x is less than -1, sets to

       If x is -1, sets to

SEE ALSO
       annuity(3M), compound(3M), expm1d64(3M), log10d64(3M), log2d64(3M), logd64(3M), math(5).

STANDARDS CONFORMANCE
       These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic".

							     HP Integrity Server Only						      log1pd64(3M)