Re: [python-control-discuss] discrete time / multiple repositories

[Gustavo G. <gor...@mi...>]

Hi Roberto,

Thanks for the files.

I do think I'm getting different behavior between MATLAB's dlqr and
Yottalab's. I'm attaching two files for the different environment
showing my results.

Gustavo



On Sat, Nov 26, 2011 at 12:05 AM, Roberto Bucher
<rob...@su...> wrote:
> Hi Gustavo
>
> here you are the modified files:
>
> matlab.py
> xferfcn.py
> statesp.py
>
> and the last yottalab.py file.
>
> Simply substitute them in the control-0.5a src folder and reinstall the
> control package.
>
> then copy directly yottalab.py at the right place (e.g.
> /usr/local/lib/python2.7/dist-packages/)
>
> Basically I've compared the result of my functions with Matlab and
> Scicoslab, and in my examples I didn't find differences.
>
> Best regards
>
> Roberto
>
> On 11/25/2011 09:48 PM, Gustavo Goretkin wrote:
>>
>> Hi Roberto,
>>
>> Thanks for the quick reply!
>>
>> Regarding the dlqr function in yottalab.py -- it doesn't seem to
>> depend on the sampling time of the discrete time system and this
>> appears to produce incorrect result, or perhaps maybe I am misusing
>> the function.
>>
>> Thank you,
>> Gustavo
>>
>> On Fri, Nov 25, 2011 at 3:38 PM, Roberto Bucher<rob...@su...>
>>  wrote:
>>>
>>> Hi Gustavo
>>>
>>> yottalab.py requires some changes in some python control files. I'll
>>> check ASAP my last modifications and I send you the required files.
>>>
>>> Best regards
>>>
>>> Roberto
>>>
>>> On 11/25/2011 09:21 PM, Gustavo Goretkin wrote:
>>>>
>>>> Hey list,
>>>>
>>>> I'd like to try use some discrete-time in python-control.
>>>> Specifically, I want MATLAB's c2d and dlqr.
>>>>
>>>> I'm aware of the discussion here [1] and code here [2]. yottalab.py
>>>> has a all the functionality I want (thanks!) but I'm not sure which
>>>> branch of python-control it is assuming. Specifically in c2d, line
>>>> line 173, there is a call to construct a statespace object which takes
>>>> 5 arguments A,B,C,D,Ts, but no such constructor seems to exist in
>>>> python-control. From the rest of the code (i.e. d2c), I infer that all
>>>> it seems to do is add a field called "Tsamp" to the statespace object.
>>>>
>>>> If the statespace object can represent both continuous and
>>>> discrete-time systems, what then should the semantics be? It looks
>>>> like  Tsamp=0 for continuous time systems.
>>>>
>>>> It also looks like there is a repository here [3]. Is it going to be
>>>> merged with the sourceforge repository eventually, or other way
>>>> around?
>>>>
>>>> Thanks!
>>>> Gustavo
>>>>
>>>> [1] http://mail.scipy.org/pipermail/scipy-dev/2010-August/015468.html
>>>> and
>>>> [2] www.dti.supsi.ch/~bucher/wp-content/uploads/2011/03/yottalab.py
>>>> [3] https://bitbucket.org/eike_welk/python-control
>>>>
>>>>
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>> contains a definitive record of customers, application performance,
>> security threats, fraudulent activity, and more. Splunk takes this
>> data and makes sense of it. IT sense. And common sense.
>> http://p.sf.net/sfu/splunk-novd2d
>> _______________________________________________
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>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
> python-control-discuss mailing list
> pyt...@li...
> https://lists.sourceforge.net/lists/listinfo/python-control-discuss
>
>