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-%%
-%% A DANTE-Edition example
-%%
-%% Example 30-04-11 on page 610.
-%%
-%% 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{375.57637pt}
-\setlength\parindent{0pt}
-
-\usepackage{pstricks-add}
-\def\Lissa{t dup 2 RadtoDeg mul cos 3.5 mul exch 6 mul RadtoDeg sin 3.5 mul}
-
-\begin{document}
-\psset{unit=0.75cm}
-\begin{pspicture}(-4,-5)(4,5)% secant gradient
- \parametricplot[plotpoints=500,linewidth=1.5pt]{0}{3.141592}{\Lissa}
- \multido{\r=0.000+0.314}{11}{%
- \psplotTangent[arrows=<->,linecolor=black!40]{\r}{1.5}{\Lissa}}
- \multido{\r=0.157+0.314}{11}{%
- \psplotTangent[arrows=<->,linecolor=black!40]{\r}{1.5}{\Lissa}}
- \rput(0,4.5){secant gradient}
-\end{pspicture}\hfill%
-%
-\def\LissaAlg{3.5*cos(2*t)|3.5*sin(6*t)}
-\def\LissaAlgDer{-7*sin(2*t)|21*cos(6*t)}
-\begin{pspicture}(-4,-5)(4,5)% tangent gradient
- \parametricplot[algebraic,plotpoints=500,
- linewidth=1.5pt]{0}{3.141592}{\LissaAlg}
- \multido{\r=0.000+0.314}{11}{%
- \psplotTangent[algebraic,arrows=<->,linecolor=black!40]{\r}{1.5}{\LissaAlg} }
- \multido{\r=0.157+0.314}{11}{%
- \psplotTangent[algebraic,arrows=<->,linecolor=black!40,%
- Derive=\LissaAlgDer]{\r}{1.5}{\LissaAlg} }
- \rput(0,4.5){tangent gradient}
-\end{pspicture}
-\end{document}