tikz-matrixtikz-pgf
The example Matrix Multiplication fails to compile.
From this answer I gathered that something changed in TikZ 3.0, but since the answer does not really explain what one should change, I'm stuck as before.
The error is the following:
! Package pgf Error: No shape named A-2-1 is known.
The reason is that \pgfmathsetmacro{\MB}{4} (there is no ; required) sets \MB to the arithmetic result of 4.0 not 4. Therefore you get V4.04.0 as node expression. Everything after a dot is taken as node anchor, i.e. TikZ looks for a node V4 with the anchor 04.0, which leads to the error you get. (Numeric anchors are also taken as angle (in degrees), so V\MB would be node V4 with the angle node at 0 degrees.)
To fix this use \pgfmathtruncatemacro{\MB}{4} which will give you 4.
See also the related questions How to draw lines between nodes that point at the node center, but stop at the nodes edge and Referring to tikz matrix coordinates using pgf mathematics operations, which where caused from the same behaviour of \pgfmathsetmacro.
In the newer version of PGF \shape@name is now \pgf@sm@shape@name:
\documentclass[tikz,border=5]{standalone}
\makeatletter
\long\def\pgfshapeaddanchor#1#2{%
{%
\def\pgf@sm@shape@name{#1}%
\let\anchor=\pgf@sh@anchor%
#2}%
}
\pgfshapeaddanchor{rectangle}{%
\anchor{west north west}{%
\pgf@process{\northeast}%
\pgf@ya=1.5\pgf@y%
\pgf@process{\southwest}%
\pgf@y.5\pgf@y%
\advance\pgf@y by \pgf@ya%
\pgf@y=.5\pgf@y%
}%
\anchor{north north west}{%
\pgf@process{\southwest}%
\pgf@xa=1.5\pgf@x%
\pgf@process{\northeast}%
\pgf@x.5\pgf@x%
\advance\pgf@x by \pgf@xa%
\pgf@x=.5\pgf@x%
}%
\anchor{west south west}{%
\pgf@process{\northeast}%
\pgf@ya=.5\pgf@y%
\pgf@process{\southwest}%
\pgf@y=1.5\pgf@y%
\advance\pgf@y by \pgf@ya%
\pgf@y=.5\pgf@y%
}%
\anchor{south south west}{%
\pgf@process{\northeast}%
\pgf@xa=.5\pgf@x%
\pgf@process{\southwest}%
\pgf@x=1.5\pgf@x%
\advance\pgf@x by \pgf@xa%
\pgf@x=.5\pgf@x%
}%
}
\makeatother
\tikzset{shape example/.style={
color=black!30, draw, fill=yellow!30,
line width=.5cm, inner xsep=2.5cm, inner ysep=0.5cm,
}}
\begin{document}
\Huge
\begin{tikzpicture}
\node[name=s,shape=rectangle,shape example] {Rectangle\vrule width 1pt height 2cm};
\foreach \anchor/\placement in
{north west/above left, north/above,
west/left, south west/below left, south/below}
\draw[shift=(s.\anchor)] plot[mark=x] coordinates{(0,0)}
node[\placement] {\scriptsize\texttt{(s.\anchor)}};
\foreach \anchor/\placement in
{west south west/below left, west north west/above left,
north north west/above, south south west/below}
\draw[red,shift=(s.\anchor)] plot[mark=x] coordinates{(0,0)}
node[\placement] {\scriptsize\texttt{(s.\anchor)}};
\end{tikzpicture}
\end{document}
Best Answer
The syntax that you have to change to get this to compile is to use the
|[node style]| node contentinstead of\node[node style] {node content};for each of the nodes. This is explained in Compilation problem with tikz diagram. Basically, if you have amatrix of [math] nodes, TikZ adds the\node[name=A-1-1] {and};for you around the contents. Then you can refer to each node in the matrix separately. If you explicitly declare the node with\node[] {};in each cell, TikZ can't do that anymore, and the names are undefined. To fix that example, you can do a regex find/replace:Find:
\\node\[(.*)\] \{(.*)\};Replace:|[\1]| \2