[OS X TeX] Cancelling columns?

[Alain Matthes]

Le 21 mars 08 à 02:50, David Derbes a écrit :

> I apologize for what is probably a simple thing, but it's defeated  
> me for a while now.
>
> I am writing a small note about calculation of determinants using  
> minors. I would like to draw explicitly a line through the numbers  
> of a row

not a good idea but "for me", I prefer to use boxes like below but
It' s possible to draw a line with TikZ and matrix node like you want

\documentclass[]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}

\begin{tikzpicture}
\matrix (magic) [matrix of nodes]
{
8 & 1 & 6 \\
3 & 5 & 7 \\
4 & 9 & 2 \\
};
\draw[thick,red,-] (magic-1-2.north) -- (magic-3-2.south);
\end{tikzpicture}

\end{document}

> (which I think I can do with the ``soul'' package.) But how to do it  
> with a column? If worse comes to worse, I can use LaTeXiT to export  
> the matrix to Illustrator, draw the lines in Illustrator, and then  
> use it as a graphic. But if LaTeX will do the job, I'd prefer that.
>
> Many thanks in advance,


Perhaps you can try something like the code below :

 From MathMode.pdf by Herbert Voss .


\documentclass[]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}

\begin{document}
\[
\left(
\begin{array}{c@{}c@{}c}
\begin{array}{|cc|}
\hline
a_{11} & a_{12} \\
a_{21} & a_{22} \\
\hline
\end{array} & 0 & 0 \\
0 & \begin{array}{|ccc|}
     \hline
     b_{11} & b_{12} & b_{13}\\
     b_{21} & b_{22} & b_{23}\\
     b_{31} & b_{32} & b_{33}\\
     \hline
     \end{array} & 0 \\
0 & 0 & \begin{array}{|cc|}
         \hline
         c_{11} & c_{12} \\
         c_{21} & c_{22} \\
         \hline
         \end{array} \\
\end{array}
\right)
\]

\[
\overrightarrow{A}=\left[
     \begin{array}{cccc}
	1 & 2 & 3 & 4\\
	1 & 2 & 3 & 4\\\hline
	\multicolumn{1}{|c}{1} & 2 & 3 &
	\multicolumn{1}{c|}{4}\\\hline
	1 & 2 & 3 & 4
     \end{array}\right]
\]


\[
\overrightarrow{A}=\left[
     \begin{array}{cc|c|c}\cline{3-3}
	1 & 2 & 3 & 4\\
	1 & 2 & 3 & 4\\
	1 & 2 & 3 & 4\\
	1 & 2 & 3 & 4\\\cline{3-3}
     \end{array}\right]
\]

\[
\overrightarrow{A}=\left[
     \begin{array}{cc|c|c}\cline{3-3}
	1 & 2 & 3 & 4\\
	1 & 2 & 3 & 4\\\hline
	\multicolumn{1}{|c}{1} & 2 & 3 &
	\multicolumn{1}{c|}{4}\\\hline
	1 & 2 & 3 & 4\\\cline{3-3}
     \end{array}\right]
\]
\end{document}

Best Regards

Alain Matthes