[pstricks] Two fail --- Backward solution?

Hernando Diaz hdiazmo at unal.edu.co
Fri Feb 6 14:42:06 CET 2009

David Arnold escribió:
> All,
> I'm wondering why my initial conditions at -1.5 and 1.5 fail to draw  
> in the code below. Also, I am looking for a way to do solutions  
> backward in time.
Hi David:
How about using

\def\negFunct{dup 3 exp exch sub neg}

and then solving


Best regards,
Hernando Diaz

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