Eric S Fraga writes:
> At Thu, 28 Jan 2010 18:58:38 +0100,
> Carsten Dominik wrote:
>
> [...]
>
> >
> > Is there a LaTeX command that can figure out if it is running a beamer
> > class?
> > If yes, a possible solution would be to redefine \alert in LaTeX when
> > not doing BEAMER.
> >
> > - Carsten
> >
>
> This must be possible but my latex (and tex) programming capabilities
> are even worse than my elisp... :(
>
> For any LaTeX expert out there, is there an easy way to determine
> whether a particular macro has been defined? If so, we wouldn't even
> need to check for beamer, simply for \alert.
Use the
\ifx<command>\undefined ... \else ... \fi
construct to determine if a command already exists, and then to take
action in the appropriate case. Test the example below both as-is and
with the first ~\newcommand*{\thisalert}~ commented out to see the
different results.
: \documentclass{article}
: \newcommand*{\thisalert}{Do this.}
: % Test for existence of \thisalert.
: % Create or modify the command accordingly.
: \ifx\thisalert\undefined%
: \newcommand*{\thisalert}{Do that.}%
: \else%
: \renewcommand*{\thisalert}{Do this differently.}
: \fi
: \begin{document}
:
: \thisalert
:
: \end{document}
I hope this is of use,
Tim
>
>
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