Sorry for the delayed response. Just got back to reading email.
Short summary: I have a lame workaround below.
On Tue, May 02, 2006 at 12:32:46AM +0200, Tzahi Fadida wrote:
> There is a known issue in ivritex that
> when you put \ref in an equation environment or $ $
> you get an error in the second run of elatex.
That i, after references are expanded.
>
> I use a lot something like this:
> \newcommand{\SFDPRE}{\ref{fig:alg:a}:\ref{fig:alg:b}}
>
> \begin{equation}%
> X_{\SFDPRE} = 2s%
> \end{equation}%
>
> What can I do to either solve it or circumvent it. When I look
> in the hebtech.cls I can't find something that changes the equation
> environment.
It is hebrew.ldf and the changes are generally around the contents that
\label saves.
> I have a hunch it is connected somehow to what they do to the .aux file. It
> does not
> look like a regular .aux file and the error only happens on the second run.
> I think they also mess with the \ref tag, as I see in hebrew.dtx but I don't
> know where it finally
> goes.
>
> Maybe there is a way to do early binding of \SFDPRE to some text variable and
> then put it in the
> equation?...
I wrote the following test document:
\documentclass{article}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[english,hebrew]{babel}
\newcommand{\SFDPRE}{\ref{fig:alg:a}:\ref{fig:alg:b}}
\begin{document}
\begin{figure}[h]
איור ראשון
\label{fig:alg:a}
\end{figure}
\begin{figure}[h]
איור שני
\label{fig:alg:b}
\end{figure}
\begin{equation}
X_{\SFDPRE} = 2s
\end{equation}
\end{document}
There seem to be problems indeed. You're looking at slightly the wrong
place: the contents of the .aux file is written from the command \label
at the first run. Indeed a simple workaround for the above file is:
Document with a workaround:
\documentclass{article}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[english,hebrew]{babel}
\newcommand{\SFDPRE}{\ref{fig:alg:a}:\ref{fig:alg:b}}
\makeatletter
% \label is originally defined in latex.ltx. redefined in hebrew.ldf .
% [EMAIL PROTECTED] is defined/redefined in latex.ltx
[EMAIL PROTECTED]
[EMAIL PROTECTED]
[EMAIL PROTECTED]@enumii)\theenumii(}%
[EMAIL PROTECTED]@auxout{}%
% The change is here: replaced \beginR [EMAIL PROTECTED] \endR
% with: [EMAIL PROTECTED]
% - This made it pass latex, but numbers are not displayed.
[EMAIL PROTECTED]
% If we get rid of the label word itself the number shows up:
{\string\newlabel{#1}{{\thepage}}}%
\else
[EMAIL PROTECTED]@enumii(\theenumii)}%
[EMAIL PROTECTED]@auxout{}%
[EMAIL PROTECTED]
\fi
[EMAIL PROTECTED]
\makeatother
\begin{document}
\begin{figure}[h]
איור ראשון
\label{fig:alg:a}
\end{figure}
\begin{figure}[h]
איור שני
\label{fig:alg:b}
\end{figure}
\begin{equation}
X_{\SFDPRE} = 2s
\end{equation}
\end{document}
-- Tzafrir
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