geometric transformations

[Thomas Siegel]

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Rick Hensh wrote:
> Perhaps someone can help. It is easy to use PSTricks and specials to graph
> the function,
> say
> 
>         y = f[x]
> 
> For example, if f[x] = x*(1-x) I've successfully tried
> 
> \special{!/myfunction {x dup 1 exch sub mul} bind def}
> \psplot[myparem]{-5}{5}{myfunction}
> 
> Now I would like to sketch    y = f[x-2]     by trying something like
> 
> \psplot[myparem]{-5}{5}{x 2 sub myfunction}
> 

you should define your function in a different way. Here is a little
example:

\documentclass{article}

\usepackage{pstricks}
\usepackage{pst-plot}



\begin{document}

\psset{yunit=.5cm}

\special{!/myfunction {dup 1 exch sub mul} bind def}

\begin{pspicture}(-5,-30)(5,1)\psgrid
\psplot[linecolor=red]{-5}{5}{x myfunction}
\psplot[linecolor=green]{-3}{5}{x 2 sub myfunction}
\end{pspicture}

\end{document}

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