[pstricks] \parabola

[Herbert Voss]

mokaude wrote:

> I would like to use \parabola to draw a parabola that passes through  
> (-1,0) with a maximum at (1,3).
> It is possible to draw this parabola for x greater than 1 ? lower  than 
> -1 ?
> 
> Should I use \psplot instead ?

maybe an option, but you also can overwrite the uneeded
area -1..+1

Herbert


\documentclass{minimal}
\usepackage{pst-plot}
\begin{document}

\begin{pspicture*}(-3,-3)(5,5)
     \psaxes(0,0)(-2,-2)(4,4)
     \parabola(-1,0)(1,3)
\end{pspicture*}

\begin{pspicture*}(-3,-2)(5,5)
     \parabola(-2,-6)(1,3)\psframe*[linecolor=white](-1,-3)(1,5)
     \psaxes(0,0)(-2,-2)(4,4)
\end{pspicture*}
\end{document}