[pstricks] Two fail --- Backward solution?

[David Arnold]

No, your picture is not correct. Although the following picture is  
also incorrect, I will use it to explain.

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There are two trajectories missing from the above image. The relevant  
code lines are:

	\psplotDiffEqn[linecolor=black,method=varrkiv,varsteptol=0.0001]{-2} 
{2}{-1.0051}{\Funct}
	\psplotDiffEqn[linecolor=black,method=varrkiv,varsteptol=0.0001]{-2} 
{2}{1.0051}{\Funct}

These two code lines do not draw the trajectories, one of which  
should be above the line y=1, the other below the line y=-1.

As both of these solutions "explode" to infinity, could it be a  
clipping problem?


The full code is:

\documentclass{article}
\usepackage{amsmath}
\usepackage{pstricks-add}

\begin{document}

\def\Funct{dup 3 exp exch sub}
\psset{unit=2cm,arrowscale=2}
\begin{center}
\begin{pspicture}(-2,-2)(2,2)
	\psaxes[labels=none,ticksize=0 0pt]{<->}(0,0)(-2,-2)(2,2)[$t$,0][$y$,0]
	\psline[linecolor=blue,linewidth=1pt]{<->}(-2,-1)(2,-1)
	\psline[linecolor=blue,linewidth=1pt]{<->}(-2,0)(2,0)
	\psline[linecolor=blue,linewidth=1pt]{<->}(-2,1)(2,1)
	\psplotDiffEqn[linecolor=black,method=varrkiv,varsteptol=0.0001]{-2} 
{2}{-1.0051}{\Funct}
	\psplotDiffEqn[linecolor=black,method=varrkiv,varsteptol=0.0001]{-2} 
{2}{-0.9736}{\Funct}
	\psplotDiffEqn[linecolor=black,method=varrkiv,varsteptol=0.0001]{-2} 
{2}{0.9736}{\Funct}
	\psplotDiffEqn[linecolor=black,method=varrkiv,varsteptol=0.0001]{-2} 
{2}{1.0051}{\Funct}
	\uput[l](-2,1){$y=1$}
	\uput[l](-2,0){$y=0$}
	\uput[l](-2,-1){$y=-1$}
	\pscircle[fillstyle=solid,fillcolor=white,linecolor=blue](0,1){3pt}
	\pscircle[fillstyle=solid,fillcolor=blue,linecolor=blue](0,0){3pt}
	\pscircle[fillstyle=solid,fillcolor=white,linecolor=blue](0,-1){3pt}
	\psset{arrowscale=1}
	\psline[linecolor=red,linewidth=3pt]{->}(0,1.3)(0,1.7)
	\psline[linecolor=red,linewidth=3pt]{<-}(0,0.3)(0,0.7)	
	\psline[linecolor=red,linewidth=3pt]{->}(0,-0.7)(0,-0.3)
	\psline[linecolor=red,linewidth=3pt]{->}(0,-1.3)(0,-1.7)
\end{pspicture}
\end{center}

\end{document}


David.


On Feb 6, 2009, at 9:44 AM, Dominique RODRIGUEZ wrote:

Dear David,

Everything works well for me too, please look at my corresponding ps  
file.
Is it what you want?

Could you put the macro \listfiles in the preamble and send me the  
resulting
list to see the version of the various pstricks file.

For plotting a reverse time graph, it should work directly simply by  
specifying:
{0}{-2} as argument, but I test it and it doesn't work ;-(

I have to look in the code.

Dominique
--
   Les Galini?res - 07460 St Andr? de C. FRANCE-- tel: (+33) 
475.39.05.82<equadif.ps>_______________________________________________
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