[pstricks] pst-algparser.pro

[Herbert Voss]

Am 11.07.2010 09:53, schrieb mathias legrand:
> 
>>> Thanks, I see that the Derive and sum commands can be of great help.
>>> Anyway, is postscript aware
>>> of recursive statements? Most of the polynomials of interest are defined
>>> as, for instance:
>>> P_n(x)=xP_{n-1}(x)+P'_{n-1}(x)
>>> with some initial P_0(x) and P_1(x) polynomials.
>>>      
>> no, you have to define your own function. However,
>> it is not too difficul
> 
> Here is what I could do:
> 
> \psset{xunit=3,yunit=2}
> \def\in{7}
> \begin{pspicture}(-1.1,-1.1)(1.1,1.1)
> \psclip{\psframe[linestyle=none](-1.1,-1.1)(1.1,1.1)}
> \psplot[linewidth=1pt,algebraic=true,linecolor=red]{-0.5}{0.5}{Derive(\in,((x^2-1)^\in))/((2^\in)*fact(\in))}
> 
> \endpsclip
> \psframe(-1.01,-1.01)(1.01,1.01)
> \end{pspicture}}
> 
> 
> Anyway, for \in higher than 7, it crashes. Any idea why ? Otherwise, I
> am pretty happy with it.

it is a restriction in the pst-algparser.pro file.
Maybe Dominique can help.
However, why do you always use \psclip instead of
\begin{pspicture*} ... \end{pspicture*}

Herbert