Hi Aditya,
> Could be due to the change in catcode of &. Try adding \donknuthmode.
It doesn't make any difference if I put the \donknuthmode just before
\starttikzpicture. But If I put it before the \usemodule[tikz], then I
get another error:
Package pgfbasematrix: Error! Single ampersand used with wrong catcode.
! Missing number, treated as zero.
system > tex > error on line 12 in file testcontext.tex:
Missing number, treated as zero ...
2 \usemodule[tikz]
3 \usetikzlibrary{matrix}
4
5 \starttext
6 \tikzstyle{description}=[fill=white,inner sep=2pt]
7 \starttikzpicture
8 \matrix(m)[matrix of math nodes,
9 row sep=3em, column sep=3em,
10 text height=1.5ex, text depth=0.25ex]
11 {x&y\\
12 >> z&u};
13 \path[->]
14 (m-1-1) edge node[description] {$*$} (m-1-2)
15 edge node[description] {$*$} (m-2-1)
16 (m-1-2) edge[dashed] node[description] {$*$} (m-2-2)
17 (m-2-1) edge[dashed] node[description] {$*$} (m-2-2);
18 \stoptikzpicture
19 \nonknuthmode
20 \stoptext
21
<to be read again>
\pgf@matrix@column@sep@2
\pgf@matrix@endcell ...ixcurrentcolumn \endcsname
\relax \advance \pgf@picmi...
<template> \pgf@matrix@endcell
}\endtemplate
\pgf@matrix@no@eom@found ->\cr
\noalign {\vskip \pgf@y \ifpgf@matrix@fixed \...
<to be read again>
z
l.12 z
&u};
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