[Tex/LaTex] undefined control sequence ‘\For’ – algorithmicx package

algorithmicx

I have to write some algorithm, thus I've decided to use algorithmicx package:

\usepackage{algorithm}
\usepackage{algorithmicx}

\begin{algorithm}
    \begin{algorithmic}[1]
        \For{aa}
            \State $Sim(i,j) \gets \frac{v_{i} \cdot v_{j}}{\left|v_{i}\right|\left|v_{j}\right|}$
        \EndFor
    \end{algorithmic}
    \label{alg:rAP}
    \caption{algorithm}
\end{algorithm}

Everything is fine but LaTeX saysUndefinde control sequence \For

I'm very confused because I've just follow the instruction of algorithmicx

Also there is no problem to use \State (when I've commented out \For)

I've also tried \FOR, \for but nothings work.

Seems algorithmicx package are not deprecated and it makes me more confused.

Best Answer

From the algorithmicx documentation:

The package algorithmicx itself doesn’t define any algorithmic commands, but gives a set of macros to define such a command set. You may use only algorithmicx, and define the commands yourself, or you may use one of the predefined command sets.

These predefined command sets (layouts) are:

algpseudocode...

algcompatible...

algpascal...

algc...

This means that loading the algorithmicx package only, you have to define yourself the commands.

If you want to use one of the predefined sets of commands, you have to load the corresponding package, in your case algpseudocode.

MWE:

\documentclass{article}

\usepackage{algorithm}
\usepackage{algpseudocode}

\begin{document}

\begin{algorithm}
    \begin{algorithmic}[1]
        \For{aa}
            \State $Sim(i,j) \gets \frac{v_{i} \cdot v_{j}}{\left|v_{i}\right|\left|v_{j}\right|}$
        \EndFor
    \end{algorithmic}
    \label{alg:rAP}
    \caption{algorithm}
\end{algorithm}

\end{document}

Output:

enter image description here

Related Solutions

[Tex/LaTex] How to use algorithmicx package

You need to remove

\usepackage{algorithmicx}

and use the following in your preamble:

\usepackage{algorithm}% http://ctan.org/pkg/algorithms
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx

The reason for this is because the algorithmicx package provides (in addition to just defining the algorithmic environment through algorithmicx.sty) a bundle of style files with predefined macros (like \Procedure, \Comment, etc), including algpseudocode.sty. See the package documentation (section 2.1 The package for more on this).

One thing the algorithmicx package does not define is the floating algorithm environment. That is provided by the algorithms bundle. Hence the requirement to include that as well.

[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

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[Tex/LaTex] How to use algorithmicx package

[Tex/LaTex] Algorithm and IEEEtran

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