Re: Linear time-invariant time response kernel, MATLAB vs Octave Code

[babelproofreader]

Lukas Reichlin-4 wrote
> On 18.09.2014, at 15:47, babelproofreader <

> babelproofreader@

> > wrote:
> 
>> I am trying to get some MATLAB scripts to run in Octave, but have a
>> problem
>> with the following line of code:
>> 
>> x = ltitr( a, b, u, x0 ) ;
>> 
>> which throws an error in Octave.
>> 
>> Online research shows that the ltitr function is an internal MATLAB
>> function
>> that returns the Linear time-invariant time response kernel for the given
>> inputs. This sounds as if it should be a common DSP requirement, so I
>> feel
>> that this must be implemented directly in Octave, or in the latest
>> Control
>> package from Source Forge. However, I can't seem to find an Octave
>> equivalent. I've read the documentation for the latest Octave Control
>> package and maybe I should be using the functions lsim.m or ss.m or dss.m
>> but I'm not really sure.
>> 
>> Can anyone enlighten me? If it's not implemented in Octave, maybe some
>> online reference to code that I could use to write my own ltitr function?
> 
> 
> You could start from something like this:
> 
> 
> function x = ltitr (a, b, u, x0)
> 
>   x = lsim (ss (a, b, [], [], -1), u, [], x0);
> 
> endfunction
> 
> 
> Hope this helps,
> Lukas
> 
> 
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This works. Thanks



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