%% 
%%  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)(-5.5,-5.5)(5.5,5.5)
 \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}
