[Tex/LaTex] Problems with algoritmicx package

algorithmserrors

However I turn and twist it, for some reason I can't get the two lines I have commented out to work. It keeps giving me the error: "Undefined control sequence."

\begin{algorithm} 
\caption{RIGHT-ROTATE algorithm}\label{right} 
\begin{algorithmic}[1]
\Procedure{Right-Rotate}{$T,y$}\Comment{right rotation of an binary search tree}
\State{$x = y.left$}
\If{$y.right \neq T.nil$}
\State{$y.right.p = x$}
\State{$x.p = y.p$}
\EndIf
\If{$y.p == T.nil$}
\State{$T.root = x$}
%\ElseIf{$y == y.p.right$}
%\State{$y.p.right = x$}
\Else \,{$y.p.left = x$}
\EndIf
\EndProcedure 
\end{algorithmic} 
\end{algorithm}

Best Answer

It’s \ElsIf, not \ElseIf (note the missing e).

Furthermore, algorithm pseudocode can (and should, for readability) be indented as usual in LaTeX:

\If{$y.p == T.nil$}
    \State{$T.root = x$}
\ElsIf{$y == y.p.right$}
    \State{$y.p.right = x$}
\Else
    \,{$y.p.left = x$}
\EndIf

Related Solutions

[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.

[Tex/LaTex] Problems with endfloat package

Not sure it's documented (didn't look:-) but due to the way the package scans for the environment

\end{table}

needs to be on its own at the start of the line so delete the spaces before it in your example.

This is documented in the endfloat manual

10.1 Literal strings

When floats are being read, LATEX is in verbatim mode. Among other things, this means that the lines like

\end{figure}

must appear on lines by themselves without any whitespace before or after them. A complete reimplementation of the most difficult part of the package is required to fix this limitation, but it is among the distant goals I have.

Best Answer

Related Solutions

[Tex/LaTex] Algorithm and IEEEtran

[Tex/LaTex] Problems with endfloat package

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