Re: Impulse function and it's arguments

[Aleksandar Arsovic]

Hi,

I took some equations as an example and solved impulse responses manually. I used transfer function as a system model.  For first equation the script works, and for the second it doesn't. I tried to find answers on Internet, but failed.

In this gist there is a source for script and a .tex file in which are written equations that I used:
https://gist.github.com/aleksandar2810/b24477e3dca02b166df6bcaa257270cd

Also I ran this script in Matlab and it seems to work. I used Octave 4.0.0. and Matlab 2015.

Thank You,
Aleksandar Arsovic

On Wed, May 18, 2016 at 2:26 PM, Juan Pablo Carbajal <address@hidden> wrote:

On Wed, May 18, 2016 at 2:22 PM, Aleksandar Arsovic
<address@hidden> wrote:
> Thank You for Your response.
>
> I didn't know how to send You equations and code, so I made .pdf and .m
> file. I hope that is not a problem.
>
> I took some equations as an example and solved impulse responses manually. I
> used transfer function as a system model. In .pdf file in attachment is
> everything I used to make a script. For first equation the script works, and
> for the second it doesn't. I tried to find answers on Internet, but failed.
>
> Also I ran the script in Matlab and it seems to work. I used Octave 4.0.0.
> and Matlab 2015.
>
> Thank You,
> Aleksandar Arsovic
>
>
> On Tue, May 17, 2016 at 8:30 AM, Juan Pablo Carbajal <address@hidden>
> wrote:
>>
>> On Tue, May 17, 2016 at 1:18 AM, Aleksandar Arsovic
>> <address@hidden> wrote:
>> > Dear Sir/Madam,
>> >
>> > I am writing with regards to a impulse() function implemented in Octave.
>> >
>> > I have a system defined with differential equation. It seems to me that
>> > my
>> > differential equation is LTI model, is that true?
>> >
>> Impossible to know without the actual equation. Do the parameters
>> depend on time? Is it linear?
>>
>> > Now, how can I create sys variable so I can use it as an argument in
>> > impulse(sys) function?
>> You need to create the matrices that represent your differential
>> equation (LTI) and use the function
>> Then use functions ss or tf depending on how you wrote your system
>>
>> http://octave.sourceforge.net/control/overview.html#Linear_Time_Invariant_Models
>>
>> >
>> > I understand that sys variable is LTI model for the system, but I don't
>> > understand what it actually represents (an array, matrix...), could You
>> > explain that a bit?
>> >
>> Maybe you want to look at the manual
>> https://www.gnu.org/software/octave/doc/v4.0.1/Matrices.html#Matrices
>>
>> > Also I understood that impulse() function is supposed to plot (or
>> > return)
>> > system response to Dirac function (like in Matlab), if that is not the
>> > case,
>> > could You please explain the usage of the function.
>> >
>> Yes, that is what it does. It uses the same underlying library as matlab
>> does.
>>
>> > Thank You in advance,
>> > Aleksandar Arsovic
>> >
>> > _______________________________________________
>> > Help-octave mailing list
>> > address@hidden
>> > https://lists.gnu.org/mailman/listinfo/help-octave
>> >
>
>

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