Thx list,
in the meanwhile, I found one way to walk an expression tree
but it was not as convincing as your suggestions.
Being new to maxima language and lisp,
I must change some of my habits ;-)
Le 19 juin 2012 ? 17:41, Robert Dodier a ?crit :
>
>> how would I walk an expression to find the integrate and diff operators ?
>
> Well, my advice is, do not continue down this road. Maxima already has
> various functions for expression hacking. What are you trying to
> accomplish exactly? I will try to help you figure out how to use
> existing functions to accomplish it.
For the short story, my goal is to compute solutions of some systems of partial differential equations
in the sense of distributions. No Laplace transform allowed.
Regards
Jerome