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Englab 0.2.1alpha (englab-special_functions branch)
07-18-2008
EngLab is a cross-compile mathematical platform with a C like syntax intended to be used both by engineers and users with little programming knowledge. It supports programming through small script files but also enables users to easily compile their own functions as shared objects and use them through the program's main interface.|
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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)