%% 
%%  A DANTE-Edition example
%% 
%% 
%%  Copyright (C) 2010 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}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-plot,pst-xkey,multido}
\makeatletter
\pst@addfams{user}
\define@key[psset]{user}{nLoop}{\def\psnLoop{#1}}
\psset[user]{nLoop=1}
\makeatother
\def\chooseColor#1{%
  \ifcase#1\or red\or green\or blue\or cyan\or magenta\or gray\fi}

\begin{document}
\psset{xunit=1.5mm,yunit=3mm}
\begin{pspicture}(-45,0)(45,20)
  \psaxes[Dy=10,Dx=15]{->}(0,0)(-45,0)(45,20)%
  \psset{linewidth=1pt}%
  \pstVerb{%
     /dc 0.2 def
     /kx 12 def
     /ky 12 def
     /pi 3.141529 def
     /rad2deg { 57.296 mul } def
     /si { pi mul dup rad2deg sin exch div } def
     /Func {
       /nLoop exch def
       x kx mul nLoop mul cos
       nLoop dc mul si mul
     } def
  }%
  \psset{plotpoints=400,linecolor=red,plotstyle=curve}%
  \multido{\iA=1+1}{6}{%
    \psplot[linecolor=\chooseColor\iA,nLoop=\iA]{-45}{45}{%
      /y0 x kx mul cos dc si mul def
      /y1 0 def
      1 1 \psnLoop {
        Func y1 add /y1 exch def
      } for
      y1 y0 add
      dc mul 2 mul
      dc add
      ky mul
    }%
  }%
\end{pspicture}
\end{document}
