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I want to make a matrix that incorporates both multirow and multicolumn. However the code doesn't work. Sorry if the question is stupid, I am playing with matrices the whole day and probably I am tired and missing something obvious. 

\usepackage{arydshln} \usepackage{array} \usepackage{amsmath} \usepackage{multirow} \begin{document} \begin{align*} & \hspace{0.3cm}\overbrace{\hphantom{\begin{array}{ccc} a&b&c \end{array}}}\\ &\left[ \begin{array}{ccc:ccc:ccc} a&a&a&b&b&b&c&c&c\\ \multicolumn{3}{c}{0}&\multicolumn{3}{c}{0}&\multicolumn{3}{c}{\multirow{2}{c}{0}}\\ 1&2&3&4&5&6&&&\\ \end{array} \right] \end{align*} \end{document}
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  • Welcome to tex.sx! A tip: If you indent lines by 4 spaces, then they are marked as a code sample. You can also highlight the code and click the "code" button (with "101010" on it). Commented Mar 8, 2011 at 18:52

2 Answers 2

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  • Load arydshln after array instead of before. According to the manual, arydshln has to be loaded after array, longtable, colortab, and colortbl, respectively.

  • Correct the second argument to multirow. It should be a width or a * meaning the natural width.

With these corrections, the code works:

\documentclass{article} \usepackage{array} \usepackage{arydshln} \usepackage{amsmath} \usepackage{multirow} \begin{document} \begin{align*} & \hspace{0.3cm}\overbrace{\hphantom{\begin{array}{ccc} a&b&c \end{array}}}\\ &\left[ \begin{array}{ccc:ccc:ccc} a&a&a&b&b&b&c&c&c\\ \multicolumn{3}{c}{0}&\multicolumn{3}{c}{0}&\multicolumn{3}{c}{\multirow{2}{*}{0}}\\ 1&2&3&4&5&6&&&\\ \end{array} \right] \end{align*} \end{document}

Output:

multirow multicolumn example

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  • I found that out myself =) However thanks for your answer, I didn't think I am getting any. Also what about $$'s in multirow argument?(look my answer?) Commented Mar 8, 2011 at 19:55
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    @lhj7362: \multirow produces a box, inside it's not in math mode any more. You have to start math mode again inside this box. It's a similar situation with \mbox or \parbox. Commented Mar 8, 2011 at 21:38
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So, getting no responces, I solved the problem myself. First, if you use just \multicolumn, you should NOT take 3rd argument into $$'s. However if you put \multirow inside a \multicolumn you SHOULD take it into $$'s.

Second, the second argument of both \multicolumn and \multirow defines placing of the content within that area, but placing c as the \multirow argument makes the code incompilable for some reason. That error is also hard to spot. The below code works for me (note the added $$'s).

\begin{align*} &\left[ \begin{array}{ccc:ccc:ccc} a&a&a&b&b&b&c&c&c\\ \multicolumn{3}{c}{0}&\multicolumn{3}{c}{0}&\multicolumn{3}{c}{\multirow{2}{*}{$\phi$}}\\ 1&2&3&4&5&6&&&\\ \end{array} \right] \end{align*} \end{document}
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