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Latex allows to simplify things which are used often. It's a decision of style how often you will use this things. 
Very often they make it harder to read the code of the document (especially after a break of some month or for other person which see it the first time). 
On the other hand they make it easier to create a consistent layout.
All this commands are defined before the \begin{document} statement. 
It's also a good idea to export them to an own file an import them with \input{comdef.tex}

Here some tips and examples

   * If Latex fails by some hyphenation you can explain them to Latex.
     =\hyphenation{syllable-syllable}=
   * Often used words can be replaced by short ones.
     eg: =\newcommand{\IOLU}{International organized latex users\xspace}=. 
     Inside the text you need only to write =\IOLU= instead of the whole thing. 
     The =\xspace= at the end needs the package =xspace(\usepackage{xspace})= and handles the problems with space at the end of =\IOLU=.
     Don't define hundred of shorts in this style. Your text won't be readable. Another advantage is the uniform formating of all occurrence of them.
     (=\newcommand{\brand}{\textit{brand}\xspace}=).
   * For an identical figure style use a command like this: <br/>
     =\newcommand{\myFig}[5][\columnwidth]{  <br/>
     \begin{figure}[htbp]\begin{center} <br/>
     \includegraphics[width=#1]{#2} <br/>
     \caption{#3} <br/>
     \label{img:#5} <br/>
     \small{\textit{#4}} <br/>
     \end{center}\end{figure} <br/>
     }= <br/>
    It uses 5 arguments, where the first one is optional: Width of the figure (default: column-width),
    name of the file, title, caption and reference name (where img: is added by default, to prevent duplicated names). <br/>
    Example =\myFig[5cm]{psfile.ps}{Overview}{This picture show everything}{everything}= 
    or without a given width =\myFig{psfile.ps}{Overview}{This picture show everything}{everything}=
    If you define also =\newcommand{\fig}[1]{Figure \ref{img:#1}}= you can refer the picture just by using =\fig{everything}=
    (In the text figure 6 will appear as example). <br/>
    The advantage of this two commands is that you can change the layout of all pictures just by changing the command definition.
   * A little bit more complicate is newenvironment but it allows also more complicate things, because you may embed whole text passage. <br/>
     ={\newenvironment{myTab}[3][] <br/>
      {\begin{table}[#1]\begin{center}\caption{#2}\label{tab:#3}\vspace{3mm}} <br/>
      {\end{center}\end{table} <br/>
     }= <br/>
     Defines a environment for tables. The arguments are position (optional), title and reference name ( with an additional tab: <br/>
      =\begin{myTab}{the results of my work}{reswork}=  <br/>
      Caption of the table, the table itself ... <br/>
      =\end{myTab}=



-- Main.JoergMaeder - 20 Dec 2010

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Changed by maederj on 20 Dec 2010 - 16:34 - r1

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