%%
%% A DANTE-Edition example
%%
%%
%% Copyright (C) 2011 Herbert Voss
%%
%% 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.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\usepackage{pst-plot,pst-tree}
\SpecialCoor
\def\drawseg#1#2{% Michael Sharpe
\pscustom{%
\translate(#1,#2)
\rotate{(\dirseg{#1}{#2})} % Vector in direction of field at x=#1,y=#2
\psline(-.25,0)(.25,0)}}
%
\def\dirseg#1#2{#2,#1}
\begin{document}
\begin{pspicture}(-6,-6)(6,6)
\psaxes{<->}(0,0)(-6,-6)(6,6)
\psset{arrows=->}
\multido{\n=-5+1}{11}{%
\multido{\N=-5+1}{11}{%
\ifnum\N=0
\ifnum\n=0
\else
\drawseg{\n}{\N}
\fi
\else
\drawseg{\n}{\N}
\fi}}
\end{pspicture}
\end{document}
