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Re: It is very difficult for Octave to calculate the inverse Laplace tra

From: Colin Macdonald
Subject: Re: It is very difficult for Octave to calculate the inverse Laplace transform of some functions
Date: Mon, 6 Jan 2020 01:45:58 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1

On 2020-01-06 12:28 a.m., billyandriam wrote:
I had no intention to torture test Gnu Octave. I had this  Exercise from my
Circuit Analysis Textbook
which I was trying to solve. It is about circuit Analysis and one has to
find Mesh currents from a planar circuit.
In the last step, one has to find the inverse Laplace transform of the two
I only found out that Gnu Octave takes a huge amount of time to calculate
the inverse Laplace transform of some functions. Yesterday night, I was
going to bed and started the calculation only to find out in the morning
that it was not yet done calculating.

Here is a screenshot:

I got the job done using Wolfram Alpha but, that leaves me a big concern. I
don't know if I can rely on Octave's symbolic calculation abilities if I
happen to encounter a comparable question in my exam and if Octave stalls.

Octave's Symbolic package relies on Sympy. While it can do transforms, its perhaps not its strongest feature.

Some things you could try:

1.  Make sure you're running a recent version of Sympy (1.4 or 1.5)

2. Try to isolate the simplest problem for which it fails, then you or I can report it upstream at (For example, there are very large integers in the screenshot you provided: does it also fail for rational expressions of quadrics with smaller coefficients?)


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