Re: Laplace transforms with symbolic package

[Colin Macdonald]

On 05/07/15 20:40, Nicholas Jankowski wrote:
> I can get the syms package, or at
> least Python, to crash out by sending it some laplace fn that gives it
> trouble. An easy one is to define multiple variables, and not tell it which
> is the laplace variable.  I.e.:
>
> > > syms P
> > > syms R
> > > f = exp(R*P)
> f = (sym)
>
>     P*R
>    e
>
> > > laplace(f)
> PYTHON: Error in cmd

Yeah, again here we lose stderr msgs because of Octave's broken popen2 
on windows.  Try

>> syms R positive

and it will work.

At least on GNU/Linux to see proper error messages.  But in general it 
needs a more robust communication layer: see talk on list about pytave.

best,
Colin