编辑

Question

我已经定义了命令

\newcommand{\tikzmark}[2]{%
    \tikz[overlay,remember picture,baseline] \node[anchor=base] (#1) {$#2$};
}

\newcommand{\DrawVLine}[3][]{%
    \begin{tikzpicture}[overlay,remember picture]
        \draw[shorten <=0.3ex, thick, #1] (#2.north) -- (#3.south);
    \end{tikzpicture}
}

\newcommand{\DrawHLine}[3]{%
    \begin{tikzpicture}[overlay,remember picture]
        \draw[shorten <=0.2em, thick, #1] (#2.west) -- (#3.east);
    \end{tikzpicture}
}

我将它们用作

\begin{equation}
\bordermatrix{
    & (A)                   & (B) & (C) & (D) & (E) \cr
(1) & 6                     & 4   & 3   & \tikzmark{topD}{2}    & \tikzmark{topA}{0} \cr
(2) & 5                     & 4   & 3   & 5                     & 0 \cr
(3) & 3                     & 7   & 3   & 0                     & 0 \cr
(4) & \tikzmark{leftB}{1}   & 0   & 0   & 4                     & \tikzmark{rightB}{0} \cr
(5) & \tikzmark{leftC}{0}   & 0   & 6   & \tikzmark{bottomD}{4} & \tikzmark{bottomA}{0}
}
\DrawVLine[color=red]{topA}{bottomA}
\DrawHLine[color=blue]{leftC}{bottomA}
\DrawVLine[color=green]{topD}{bottomD}
\DrawHLine[color=orange]{leftB}{rightB}
\end{equation}

我得到了错误

我究竟做错了什么？

编辑

一个完整的例子

\documentclass{article}

\usepackage{tikz}

\usetikzlibrary{shapes}
\usetikzlibrary{fit}
\usetikzlibrary{chains}
\usetikzlibrary{arrows}
\usetikzlibrary{positioning}
\usetikzlibrary{calc}

\newcommand{\tikzmark}[2]{%
    \tikz[overlay,remember picture,baseline] \node[anchor=base] (#1) {#2};
}

\newcommand{\DrawVLine}[3][]{%
    \begin{tikzpicture}[overlay,remember picture]
        \draw[shorten <=0.3ex, thick, #1] (#2.north) -- (#3.south);
    \end{tikzpicture}
}

\newcommand{\DrawHLine}[3]{%
    \begin{tikzpicture}[overlay,remember picture]
        \draw[shorten <=0.2em, thick, #1] (#2.west) -- (#3.east);
    \end{tikzpicture}
}

\begin{document}

\begin{equation}
\bordermatrix{
    & (A)                   & (B) & (C) & (D) & (E) \cr
(1) & 6                     & 4   & 3   & \tikzmark{topD}{2}    & \tikzmark{topA}{0} \cr
(2) & 5                     & 4   & 3   & 5                     & 0 \cr
(3) & 3                     & 7   & 3   & 0                     & 0 \cr
(4) & \tikzmark{leftB}{1}   & 0   & 0   & 4                     & \tikzmark{rightB}{0} \cr
(5) & \tikzmark{leftC}{0}   & 0   & 6   & \tikzmark{bottomD}{4} & \tikzmark{bottomA}{0}
}
\DrawVLine[color=red]{topA}{bottomA}
\DrawHLine[color=blue]{leftC}{bottomA}
\DrawVLine[color=green]{topD}{bottomD}
\DrawHLine[color=orange]{leftB}{rightB}
\end{equation}

\end{document}