General ⇒ problem division with macros

[chruschtschow]

hi guys,
i need some little math operation in my tex code, i wana do some operation as follows:

\newcommand \NumAA{aa}
\newcommand \NumAA{ab}
\newcommand \NumAA{ba}
\newcommand \NumAA{bb}
%where aa,ab,ba,bb some numerical values
\newcommand \z {\NumAA + \NumAB}
\newcommand \n {\NumBA + \NumBB}
\newcommand \q{\z / \n}

The Problem is, that latex just replaces the macros and calculates instead of
(aa + ab) / (ba + bb) -> aa + ab / ba + bb
which is common knowledge not the same... is there a possibility to use some kind of "()" or is there some kind of float register available. Thanks for ur help..
Looking forward to hearing from you.. sry, my english is not very well...

[gmedina]

Hi,

you could try using some of the features provided by the fp or fltpoint packages.

[Juanjo]

Just to complete gmedina's answer, I provide an example:

Code: Select all

\documentclass{article}

\usepackage{fp-basic}

\begin{document}

\newcommand{\MyOp}[4]{%
   \FPadd\Numerator{#1}{#2}%
   \FPadd\Denominator{#3}{#4}%
   \FPdiv\Result\Numerator\Denominator}

\MyOp{1.2}{22.3}{45.2}{36.21}
\FPprint\Result

\FPset\NumAA{11.21} \FPset\NumAB{23.4} 
\FPset\NumBA{2.45}  \FPset\NumBB{3.43}
\MyOp{\NumAA}{\NumAB}{\NumBA}{\NumBB}
\FPprint\Result

\end{document}

The fp package is divided into sub-packages. You only need one of them to get sums and divisions.

[chruschtschow]

hi,
that is exactly what im looking for! Thank u guys!!