%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-7-7 on page 422.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.83385pt}
\StartShownPreambleCommands
\begin{filecontents}{LGCmatrix.dat}
/dotmatrix [ 0 1 1 0 0 0 0 1 1 1
0 1 1 0 1 1 1 0 1 0  1 0 1 1 0 0 0 1 1 0
0 0 1 0 0 0 0 0 1 1  1 1 1 1 1 0 1 0 0 1
0 0 1 1 0 1 0 1 1 1  1 0 0 0 1 1 0 0 0 1 ] def
\end{filecontents}
\usepackage{pstricks-add}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-0.5,-0.75)(6,6)
 \psaxes[dx=0.5cm,dy=0.5cm]{->}(5.5,4)
 \psMatrixPlot[unit=0.5,dotsize=0.55cm,
          dotstyle=square*,linecolor=blue]
          {7}{10}{LGCmatrix.dat}
 \psMatrixPlot[unit=0.5,dotsize=.25cm,dotstyle=o,
          ChangeOrder]{7}{10}{LGCmatrix.dat}
\end{pspicture}
\end{document}