Dear Matthias,
I took the freedom to post the suggested answer to the mailing list, I
hope you don't mind.
You idea to provide formatting instructions or other complicated control
sequences as part of symbolic coordinates can be realized, yes. As you
correctly pointed out, symbolic coordinates should not contain
formatting instructions. However, you can freely format your tick labels
- and there is a very simple way to realize a dictionary. The dictionary
then maps your symbolic coordinates to formatting instructions.
Here is an example with in-line comments describing the approach:
=====================
\documentclass[a4paper]{article}
\usepackage{pgfplots}
\begin{document}
% Task: symbolic coordinates which can be formatted somehow.
%
% Problem: coordinates must be expandable (i.e. no formatting
% instructions allowed).
%
% Suggested approach: define a dictionary which is only used for tick
% labels:
\expandafter\newcommand\csname dict.a\endcsname{$\alpha$}
\expandafter\newcommand\csname dict.b\endcsname{$\beta$}
\expandafter\newcommand\csname dict.c\endcsname{$\xi$}
% Explanation:
% \expandafter replaces the *second* following token by its
% "top-level" expansion:
% \expandafter\newcommand\csname dicta\endcsname{...}
% -->
% \newcommand\dicta{...}
%
% \csname ...\endcsname is, in principle, the same as '\...'. But you
% can use any characters inside of '...', including commands.
\begin{tikzpicture}
\begin{axis}[
symbolic x coords={a,b,c},xticklabel=\csname dict.\tick\endcsname,
xtick=data,
]
\addplot coordinates {(a,2) (b,3) (c,4)};
\end{axis}
\end{tikzpicture}
\end{document}
=====================
Is this close to what you had in mind?
Best regards
Christian
PS
There is also a simple way to realize that sort of stuff with pgfkeys:
use
\pgfkeyssetvalue{/dict/a}{$\alpha$}
\pgfkeyssetvalue{/dict/b}{$\beta$}
...
and later
xticklabel=\pgfkeysvalueof{/dict/\tick}
This is probably easier to read.
Am 28.01.2011 09:59, schrieb Matthias Katerbow:
> Guten Tag Herr Feuersänger,
>
> ich würde gerne bei der Nutzung des pgfplost-packages in der Angabe
> von symbolic coords phonetische Schriftzeichen mittels Tipa
> (http://www.ctan.org/tex-archive/fonts/tipa/) darstellen. Allerdings
> scheint es mir so zu sein, dass in den symbolic coords keine Befehle
> verwendet werden können (z.B. funktioniert \textit{} auch nicht).
> Haben Sie einen Lösungsvorschlag?
>
> Vielen Dank und freundliche Grüße,
> Matthias Katerbow
>
> ---
> Philipps-Universität Marburg
> Forschungszentrum Deutscher Sprachatlas
> Matthias Katerbow, M.A.
> Hermann-Jacobsohn-Weg 3
> D 35032 Marburg
> Tel.: +49 (0)6421-2824408
> Fax.: +49 (0)6421-2828936
> Sprechstunde: dienstags 9-10 Uhr
> http://www.deutscher-sprachatlas.de/mitarbeiter/katerbow/
>
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