One column matrix error

[MarioMally]

Hi,
In the appended example, errors occur because matrix.skeleton is loaded and used on a one-column-matrix. Just using the matrix-library or adding an empty second column seems to be working. Maybe this is related to pgf-tikz/pgf#267.

I don't know if you actively work on this Repo but thank you for your help.
Kind regards

\documentclass[]{article} 
\usepackage{tikz}
\usetikzlibrary{
	matrix,
	matrix.skeleton
}

\begin{document}
	\begin{tikzpicture}[]
		\matrix(m1)[matrix of nodes]  at (0,0){
			a \\
			b \\
		};
	\end{tikzpicture}
\end{document}

[dudebout]

Thank you for reporting this issue. I am indeed not actively working on this repo anymore and do not quite know how to debug this issue. It took a look and confirmed that:

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}
  \begin{tikzpicture}
    \matrix{
      a \\
      b \\
    };
  \end{tikzpicture}
\end{document}

works, whereas:

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix.skeleton}

\begin{document}
  \begin{tikzpicture}
    \matrix{
      a \\
      b \\
    };
  \end{tikzpicture}
\end{document}

throws the error:

! Undefined control sequence.
<argument> \pgf@matrix@last@nextcell@options 
                                             
l.8       a \\

It looks like \pgf@matrix@last@nextcell@options is code that is part of the matrix TikZ library, and not matrix.skeleton. matrix.skeleton is setting something up incorrectly.