7

I wonder, if possible, how to create a matrix that looks like this:

http://imageshack.us/photo/my-images/36/matrixbw.jpg/

5

Here's a solution without TikZ

\documentclass{article}
\usepackage{amssymb,array,arydshln}

\begin{document}
$\renewcommand{\arraystretch}{1.2}
\left(\begin{array}{@{}c;{3pt/1.5pt}c@{}}
  \mathit{GL}(2,\mathbb{R}) & \begin{array}{@{}c@{}}*\\{}*\end{array}\\
  \hdashline[3pt/1.5pt]
  \begin{array}{@{}c@{\hspace{1.5em}}c@{}}0&0\end{array} & *
  \end{array}\right)
$
\end{document}

However I'm usually satisfied with solid lines for partitioned matrices, so

$\renewcommand{\arraystretch}{1.2}
\left(\begin{array}{@{}c|c@{}}
  \mathit{GL}(2,\mathbb{R}) & \begin{array}{@{}c@{}}*\\{}*\end{array}\\
  \hline
  \begin{array}{@{}c@{\hspace{1.5em}}c@{}}0&0\end{array} & *
  \end{array}\right)
$

might be sufficient.

3

Here's a possible solution using a matrix of math nodes from TikZ:

\documentclass{report}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}

\begin{tikzpicture}[every left delimiter/.style={xshift=1ex}, every right delimiter/.style={xshift=-1ex}]
\matrix[matrix of math nodes,left delimiter=( , right delimiter=)] (mat)
  {
   \phantom{0} &[0.8cm] \phantom{0} & \ast \\
   \phantom{0} & \phantom{0} & \ast \\[0.3ex]
   0 & 0 & \ast\\
  };
\node[xshift=0.5cm,yshift=-7pt] at (mat-1-1) {$GL(2,\mathbb{R})$};
\draw[dashed,thick] (mat-1-2.north east) -- (mat-3-2.south east) ;
\draw[dashed,thick] (mat-2-1.south west) -- (mat-2-3.south east) ;
\end{tikzpicture}

\end{document}

EDIT: and a more conventional approach, using the multirow and arydshln packages:

\documentclass{report}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{multirow}
\usepackage{arydshln}

\begin{document}

\[
\left(
\begin{array}{cc:c}
   \multicolumn{2}{c:}{\multirow{2}{*}{$GL(2,\mathbb{R})$}} & \ast \\
   & & \ast \\ \hdashline
   0 & 0 & \ast \\
\end{array}
\right)
\]

\end{document}

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.