當節點大小由「最小大小」定義時，tikz 矩陣分隔符

Question

螺柱 CarLaTeX回答關於問題我發現矩陣分隔符號的意外行為tikz：如果數學節點的大小由text width=...和確定text height=...，則分隔符號按預期工作，但是，如果我將它們替換為minimum size=...給出錯誤!missing } inserted.. <inserted text> }。測試範例：

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{matrix}
\newcommand\x{\times}

\begin{document}
\begin{tikzpicture}
\matrix [matrix of math nodes,
         nodes={rectangle, %draw, very thin,
                minimum size=1.2em, text depth=0.25ex,
                inner sep=0pt, outer sep=0pt,
                left delimiter=(, right delimiter=),
                fill opacity=0.5, text opacity=1,
                anchor=center},
         column sep=-0.5\pgflinewidth,
         row sep=-0.5\pgflinewidth,
         column 2/.append style = {nodes={fill=cyan!50}},
         row 2/.append style = {nodes={fill=cyan!50}},
         row 2 column 2/.append style={nodes={fill=cyan}},
         ]
{
a_1 & \x  & a_3 \\
a_4 & \x  & a_6 \\
a_7 & \x  & a_9 \\
};
\end{tikzpicture}
\end{document}

如果我評論分隔符號的定義，則範例給出：

我錯過了什麼或做錯了什麼嗎？

Answer 1

您應該將其放置left delimiter=(, right delimiter=)在nodes選項之外。

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{matrix}
\newcommand\x{\times}

\begin{document}
\begin{tikzpicture}
\matrix [matrix of math nodes,
         nodes={rectangle, %draw, very thin,
                minimum size=1.2em, text depth=0.25ex,
                inner sep=0pt, outer sep=0pt,
                fill opacity=0.5, text opacity=1,
                anchor=center},
         column sep=-0.5\pgflinewidth,
         row sep=-0.5\pgflinewidth,
         column 2/.append style = {nodes={fill=cyan!50}},
         row 2/.append style = {nodes={fill=cyan!50}},
         row 2 column 2/.append style={nodes={fill=cyan}},
         left delimiter={(}, right delimiter={)}
         ]
{
a_1 & \x  & a_3 \\
a_4 & \x  & a_6 \\
a_7 & \x  & a_9 \\
};
\end{tikzpicture}
\end{document}