[OS X TeX] Problem with refs to label in algorithmic

[Ari Stern]

Hi Christopher:

This doesn't seem to be valid code for the "algorithmic" style.  It
looks like you are actually using the "algorithmicx" package, which
you can invoke together with the "algorithm" environment using the
preamble command:
\usepackage{algorithm,algpseudocode}
Is this what you are doing?

After making that change, and adding a missing \Repeat statement
(which you probably edited out), I was able to get this to typeset
with no problem.  Here's a minimal file containing your code ... see
if you can get it to work on your system.

\documentclass{article}

\usepackage{algorithm,algpseudocode}

\begin{document}

\begin{algorithm}[t]
  \caption{The Abraxas Algorithm}\label{al:abraxas}
  \begin{algorithmic}[1]
    \Procedure{Abraxas}{$C_i, P_i, T_i$}
    \Repeat
    \State Increment iteration index:  $\{C_i, P_i, T_i| i = i + 1\}$
    \Until{\textbf{StoppingCriterion}}
    \EndProcedure
  \end{algorithmic}
\end{algorithm}

We can describe the procedure presented in Algorithm \ref{al:abraxas}
as follows: .....

\end{document}

Cheers,
Ari

On 13/04/2008, Christopher Brewster <C.Brewster at dcs.shef.ac.uk> wrote:
> I am using the 'algorithm' and 'algorithmic' styles to lay out an algorithm.
>  Using \ref{} to a label inside them produces an error:
>  "Latex Error: ./Chapters/chap10.tex:187 Undefined control sequence."
>
>  *However*, the references are correctly typeset.
>  Any suggestions?
>
>  Thanks,
>  Christopher
>
>
>  Example usage is this:
>  ------
>  \begin{algorithm}[t]
>         \caption{The Abraxas Algorithm}\label{al:abraxas}
>         \begin{algorithmic}[1]
>                 \Procedure{Abraxas}{$C_i, P_i, T_i$}
>  ....
>                 \State Increment iteration index:  $\{C_i, P_i, T_i| i = i +
> 1\}$
>                 \Until{\textbf{StoppingCriterion}}
>                 \EndProcedure
>         \end{algorithmic}
>  \end{algorithm}
>
>  We can describe the procedure presented in Algorithm \ref{al:abraxas} as
> follows: .....
>
>
>
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