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-\documentclass{article}
-
-\usepackage{pstricks} % To use the standard "color" package with PSTricks
-\usepackage{multido}
-\input{random.tex} % From Donald Arseneau (on macros/generic on CTAN)
-
-\newdimen\dX
-\newdimen\dY
-\newdimen\Coor
-
-% Random walk in the unit square (#1 = number of steps)
-\def\RandomWalk#1{%
- \setrandim\dX{0pt}{1pt}
- \setrandim\dY{0pt}{1pt}
- \psdot[dotstyle=*,dotsize=6pt](\pointless\dX,\pointless\dY) % Initial point
- \pscustom{%
- \moveto(\pointless\dX,\pointless\dY) % Move to initial point
- \multido{\i=1+1}{#1}{%
- \MoveCoordinate{\dX}
- \MoveCoordinate{\dY}
- \lineto(\pointless\dX,\pointless\dY)}}} % Line between old and new position
-
-% Computation of new horizontal or vertical position of point
-\def\MoveCoordinate#1{%
- \setrandim\Coor{-0.06pt}{0.06pt} % The move
- \advance #1 by \Coor % New position
-% To stay in the square...
- \ifdim#1>1pt #1=1pt\fi
- \ifdim#1<0pt #1=0pt\fi}
-
-\pagestyle{empty}
-\parindent=0pt
-
-\begin{document}
-
-\psset{unit=7,dimen=middle,linewidth=0.5pt}
-\begin{pspicture}(1,1.01)
- \psframe[linewidth=0.1pt](1,1)
- \RandomWalk{300}
- \psset{linecolor=red}
- \RandomWalk{300}
- \psset{linecolor=green}
- \RandomWalk{300}
-\end{pspicture}
-
-\end{document}