[pstricks] \psplotDiffEqn initial conditions using \multido

[Dominique RODRIGUEZ]

>  Hi:
>  I am trying to generate  phase portraits of  differential equations using
>  \psplotDiffEqn. I would like to specify different initial conditions using a
>  \multido environment. I have tried Number (\N) and real (\R) variables
>  without success. Is there a way to do it?
>  
>  Thanks in advance.
>  Below, I include a small example of what I want
>  
>  Hernando Diaz
>  
>  \documentclass{minimal}
>  \usepackage{pstricks,pstricks-add}
>  \begin{document}
>  \def\Func{y[1]|0.5*y[1]-y[0]-y[1]^3}
>  \psset{unit=2cm,algebraic=true,linewidth=0.5pt}
>  \begin {pspicture}(-3,-3)(3,3)%\psgrid[subgriddiv=2,griddots=10]
>  \psframe(-3,-3)(3,3)
>  \psset{method=rk4,plotpoints=400,linecolor=blue,linewidth=0.5pt}
>  \psset{whichabs=0,whichord=1}
>  %\multido{\r=-1.5+1.5}{3}{
>  	\psplotDiffEqn{0}{30}{-1.5 -3}{\Func}
>  	\psplotDiffEqn{0}{30}{0 -3}{\Func}
>  	\psplotDiffEqn{0}{30}{1.5 -3}{\Func}
>  	\psplotDiffEqn{0}{30}{-1.5 3}{\Func}
>  	\psplotDiffEqn{0}{30}{0 3}{\Func}
>  	\psplotDiffEqn{0}{30}{1.5 3}{\Func}
>  %}
>  \psplotDiffEqn[whichabs=0,whichord=1]{0}{30}{0.01 0.01}{\Func}
>  \end{pspicture}
>  \end{document}

this works :

\multido{\r=-1.5+1.5}{3}{
	\psplotDiffEqn{0}{30}{\r\space -3}{\Func}
	\psplotDiffEqn{0}{30}{\r\space 3}{\Func}
}

Dominique
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