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Re: Inverse Laplace transform?


From: Joe Koski
Subject: Re: Inverse Laplace transform?
Date: Sun, 10 Dec 2006 13:25:18 -0700
User-agent: Microsoft-Entourage/11.2.5.060620

on 12/10/06 12:31 PM, Doug Stewart at address@hidden wrote:

> Joe Koski wrote:
>> on 12/10/06 10:36 AM, Doug Stewart at address@hidden wrote:
>> 
>>   
>>> Is there an inverse Laplace transform function in Octave?
>>> Doug Stewart
>>>     
>> 
>> Doug,
>> 
>> Check ifft at http://octave.sourceforge.net/index/index.html, or help ifft
>> at the octave prompt.
>> 
>> Joe
>> 
>>   
> Thanks Joe
> I did look there and there is nothing for Inverse Laplace transform that
> I can see.
> 
> 
> I have written up a crude version that is not ready for prime time yet.
> I thought I would ask before I spent the time to reinvent the wheel :-)
> 
> What I have is a function ( for the controls tool box) that takes in a
> sys type transfer function.
> It then uses the residue function to do the partial fraction
> expansion.From this I form up a string  that is the time representation
> of each factor.  What I am having a little difficulty with is how to
> get  the string formatted nicely.
> 
> I have a cell array with each location holding a string that is the time
> representation of a term.
> What I want to do  is take  these and form them into one long string
> that has all the "+"'s and "-"'s between each term properly formated.
> 
> So any help would be appreciated.
> 
> resultstring = cell(1,1)  "+" cell(2,1) "-" cell(3,1)
> 
> is what I can't seem to do?
> 
> Thanks in advance for any help.
> 
> Doug Stewart
> 

Doug,

Sorry, I was reading Fourier instead of Laplace transform. I guess I was
just seeing the word transform. For calculation of inverse Laplace
transforms, I use Maxima, a symbolic math package, and it works well.

Sorry for the confusion.

Joe




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