Re: It is very difficult for Octave to calculate the inverse Laplace transform of some functions

[Doug Stewart]

On Mon, Jan 6, 2020 at 9:02 PM Nicholas Jankowski <address@hidden> wrote:

For comparison, I was able to get the result instantly while using MATLAB
from my University's Computer Lab.

I got it to work

First let me say that it ran here for more that 10 hrs. as you presented it. But no error.

If you do    ilaplace(partfrac(aux.i2))

then you will get the answer within 1 minute.

What this does is help the solver by doing the partial fraction expansion first.

Based on this is it safe to assume that this is a sympy issue and not something octave does before sympy takes over?

Yes Octave is not doing anything wrong.  

ilaplace should automatically do a partial fraction expansion.

 

I know on the gnu maxima forums this is something they would pick apart (well, if maxima has a decent ilt implementation that is). Is the sympy community amenable you looking into such a “competitor” performance difference and how their lookup/decision/whatever processes contribute to that?

--

DAS