[Tex/LaTex] How to rename command to avoid double defined command names

algorithmicx

Hy,
I would like to use the packages vaucanson and algorithm.

\documentclass[11pt,a4paper,twoside,openright]{book}

\usepackage{algorithm}
\usepackage[noend]{algpseudocode}
\usepackage{vaucanson-g}

\begin{document}
\begin{algorithm}
\caption{code}
\begin{algorithmic}[1]
\Function{a}{$G,r,t$}
   \State $a \gets g$
\EndFunction
\end{algorithmic}
\end{algorithm}

\begin{figure}[t]
  \begin{postscript}[scale=0.6]\special{header=gastex.pro}   
  \begin{VCPicture}{(0,-2)(6,2)}
  \State[s_0]{(0,0)}{0}
  \FinalState[s_2]{(3,1)}{1}
  \EdgeL{0}{1}{t}
\end{VCPicture}
\end{postscript}
\end{figure}

\end{document}

The problem is that \State is already defined in vaucanson and I get

ERROR: LaTeX Error: Command \State already defined

Is it possible to simply rename one of the \State commands to avoid the conflict?

Best Answer

After loading algorithm, and before loading vaucanson-g, put a

\let\MyState\State
\let\State\relax

Then you can use \MyState as the \State from algorithm, and vaucanson-g can define \State afresh, avoiding the error. (Thanks, @egreg !)

Related Solutions

[Tex/LaTex] How to define a new command in algorithmicx

In the documentation you can find \algnewcommand. In relation \Require is defined as

\algnewcommand\algorithmicrequire{\textbf{Require:}}

So you can do:

\algnewcommand\algorithmicinput{\textbf{INPUT:}}
\algnewcommand\INPUT{\item[\algorithmicinput]}

Here is a complete example:

\documentclass[a4paper,11pt]{article}
\usepackage{algorithmicx}
\usepackage{algorithm}
\usepackage{algpseudocode}
\algnewcommand\algorithmicinput{\textbf{INPUT:}}
\algnewcommand\INPUT{\item[\algorithmicinput]}
\begin{document}
\begin{algorithmic}[1]
\INPUT foo
\Require $x\ge5$
\Ensure $x\le-5$
\Statex
\While{$x>-5$}
\State $x\gets x-1$
\EndWhile
\end{algorithmic}
\end{document}

enter image description here

[Tex/LaTex] Algorithm and IEEEtran

The IEEEtran's documentation suggests:

B. Algorithms

IEEE publications use the figure environment to contain algorithms that are not to be a part of the main text flow. Peter Williams’ and Rogerio Brito’s algorithmic.sty package [24] or Szász János’ algorithmicx.sty package [25] (the latter is designed to be more customizable than the former) may be of help in producing algorithm-like structures (although authors are of course free to use whatever LaTeX commands they are most comfortable with in this regard). However, do not use the floating algorithm environment of algorithm.sty (also by Williams and Brito) or algorithm2e.sty (by Christophe Fiorio) as the only floating structures IEEE uses are figures and tables. Furthermore, IEEEtran will not be in control of the (non-IEEE) caption style produced by the algorithm.sty or algorithm2e.sty float environments.

So, as suggested, do not use the algorithm floating environment; you can wrap your algorithm inside a figure (or figure*) environment (if a caption is required and the captions are to be IEEEtran compliant) and use the algorithmicx package ; something like this:

\documentclass{IEEEtran}
\usepackage{algpseudocode}

\begin{document}

\begin{figure}
\begin{algorithmic}[1]
\Procedure{Euclid}{$a,b$}\Comment{The g.c.d. of a and b}
\State $r\gets a\bmod b$
\While{$r\not=0$}\Comment{We have the answer if r is 0}
\State $a\gets b$
\State $b\gets r$
\State $r\gets a\bmod b$
\EndWhile\label{euclidendwhile}
\State \textbf{return} $b$\Comment{The gcd is b}
\EndProcedure
\end{algorithmic}
\caption{Euclid's algorithm}\label{euclid}
\end{figure}

\end{document}

enter image description here

If no caption is required, then simply don't use the figure environment.

Best Answer

Related Solutions

[Tex/LaTex] How to define a new command in algorithmicx

[Tex/LaTex] Algorithm and IEEEtran

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