log1pd128(3m) [hpux man page]

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)

log1p(3M)																 log1p(3M)

NAME

       log1p(), log1pf(), log1pl(), log1pw(), log1pq() - natural logarithm of one-plus-argument functions

SYNOPSIS

   HP Integrity Server Only
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 are accurate when x is very small, namely:

       The preceding example would be applicable when calculating small daily interest rates.  See also and

   Integrity Server Only
       is a version of it takes a argument and returns a result.

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

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

       is equivalent to on HP-UX systems.

USAGE

       To use these functions, compile either with the default option or with the and options.

       To use (for Integrity servers) or compile also with the option.

       Make sure your program includes and link in the math library by specifying on the compiler or linker command line.

       For more information, see the at the following site:

RETURN VALUE

       If x is +INFINITY, returns +INFINITY.

       If x = -1.0, returns (equal to -INFINITY) and raises the divide-by-zero exception.

       If x < -1.0, returns NaN and raises the invalid exception.

       If x is NaN, returns NaN.

       When it raises no other exception, whether raises the inexact exception is unspecified.

ERRORS

       If x < -1.0, sets to

   Integrity Server Only
       HP-UX functions on Integrity servers do not set by default.  For setting, compile with the option.

SEE ALSO

       annuity(3M), compound(3M), expm1(3M), log(3M), math(5).

STANDARDS CONFORMANCE

       : XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																	 log1p(3M)