Trouble typesetting pgfplots with context (mkiv)

Question

I'm trying to typeset the minimal pgfplots example from the Context Wiki but with no success.

Context-Wiki Example

\setupcolors[state=start]
\usemodule[tikz]
\usemodule[pgfplots]

\starttext

\starttikzpicture
        \startaxis[     xmin=0,xmax=300,
                        title=http://cryogenics.nist.gov/,
                        xlabel=$T$ (K),
                        ylabel=$(L-L_{293})/L_{293}$,
                        legend style={at={(0.95,0.05)},anchor=south east},
                        width=16cm ]
                \addplot[mark=none,color=red] plot file {sapphire.dat};
                \addlegendentry{sapphire}
                \addplot[mark=none,color=green] plot file {Be.dat};
                \addlegendentry{Be}
                \addplot[mark=none,color=blue] plot file {BeCu.dat};
                \addlegendentry{BeCu}
                \addplot[mark=none,color=cyan] plot file {SS304.dat};
                \addlegendentry{SS304}
                \addplot[mark=none,color=magenta] plot file {Al6061-T6.dat};
                \addlegendentry{Al6061-T6}
                \addplot[mark=none,color=orange] plot file {nylon.dat};
                \addlegendentry{nylon}
        \stopaxis
\stoptikzpicture

\stoptext

No matter which setup i use: the vanilla TexLive-2011 or the up-to-date standalone context i get always the same error:

    texmf-modules/tex/generic/pgfplots/numtable/pgfplotstable.coltype.code.tex)
! Missing number, treated as zero.

system          > tex > error on line 1043 in file pgfplottest.tex: Missing number, treated as zero ...


<to be read again> 
                   ^
l.1043 \catcode`\^^
                   I=12

The used versions are as followed:

pgfplots-1.5.1

mtx-context | ConTeXt Process Management 0.52
mtx-context |
mtx-context | main context file: /opt/context-minimals/texmf-context/tex/context/base/context.mkiv
mtx-context | current version: 2012.04.19 23:18

Any Ideas?

Answer 1

This seems to be either a bug on the pgf side or in the ConTeXt pgf module. It's a category code issue while reading the following lines of file pgfplotstable.code.tex.

{
  \catcode`\^^I=12
  \gdef\pgfplotstablesave@impl@TAB{^^I}
}

A work around is to fix the catcodes manually:

% \usemodule [tikz]
% \usemodule [pgfplots]

\unprotect
  \input t-pgfplots
\protect

\starttext

\starttikzpicture
\startaxis
    [xmin=0,xmax=300,
    title=http://cryogenics.nist.gov/,
    xlabel=$T$ (K),
    ylabel=$(L-L_{293})/L_{293}$,
    legend style={at={(0.95,0.05)},anchor=south east},
    width=16cm]
    \addplot[mark=none,color=red] plot file {sapphire.dat};
    \addlegendentry{sapphire}
    \addplot[mark=none,color=green] plot file {Be.dat};
    \addlegendentry{Be}
    \addplot[mark=none,color=blue] plot file {BeCu.dat};
    \addlegendentry{BeCu}
    \addplot[mark=none,color=cyan] plot file {SS304.dat};
    \addlegendentry{SS304}
    \addplot[mark=none,color=magenta] plot file {Al6061-T6.dat};
    \addlegendentry{Al6061-T6}
    \addplot[mark=none,color=orange] plot file {nylon.dat};
    \addlegendentry{nylon}
\stopaxis
\stoptikzpicture

\stoptext

This example works here with 2012.04.19 23:18 and luatex (MkIV).

Note: The catcode issue is fixed now and the workaround is not necessary any more (unless your pgfplots in older than 2012-05-12). The module can be loaded as usual:

\usemodule [pgfplots]