Re: [問題] 如何把矩陣某一列框起來
How about this, via pstricks package
\usepackage{pstricks}
..
..
\begingroup
\renewcommand*{\arraystretch}{1.5}
\[
\left[
\begin{array}{cccc}
0&0&\cdots&0\\
0&0&\rnode[lc]{c}{\cdots}&0\\ % <-- \rnode means reference node
\vdots&\vdots&\ddots&\vdots\\
0&0&\cdots&0\\
\end{array}
\right]
\]
\psellipse[linecolor=red](c)(1.2,0.4) % <-- (r1=1.2, r2=0.4)
\endgroup
The basic idea is to define a reference node c, via pstrick command \ronde
and then define the command \psellipse which requires a center point and radii r1 and r2. If not familiar with the pstricks, please Google search "pstricks user's guide" and download it for details.
Comments:
1. Obviously, the result is not perfect and improvement is possible. This is because the center point c is not easy to identify in this case.
2. To improve that, you can use \psframe command to generate a box with rounded corners which will have a much pleasant look (My guess is this would be what you want.) To that end, I will leave it to you.
3. Happy TeXploring
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