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

[Roberto B. <rob...@su...>]

You're right

something is not correct in the solution of "dare" with your matrices. I 
have to check if the problem is in my "dare" function or in the sb02od 
function of the avventi slycot library.

I'll check ASAP

Best regards

Roberto

On 11/26/2011 06:48 PM, Gustavo Goretkin wrote:
> 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
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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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