On 05.07.2011, at 14:20, Juan Pablo Carbajal wrote:
> On Tue, Jul 5, 2011 at 12:05 PM, Lukas Reichlin
> <[email protected]> wrote:
>>
>> On 05.07.2011, at 08:13, Juan Pablo Carbajal wrote:
>>
>>> On Tue, Jul 5, 2011 at 7:22 AM, Lukas Reichlin <[email protected]>
>>> wrote:
>>>> On 05.07.2011, at 00:04, Juan Pablo Carbajal wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> I was searching the control package for the functions ss2tf, abcddim.
>>>>> If I am not worng they were there some time ago, weren't they? At
>>>>> least google seems to support this.
>>>>> Where can I find them now?
>>>>> I have installed the control package 2.0.2
>>>>>
>>>>> Thank you very much
>>>>>
>>>>> --
>>>>> M. Sc. Juan Pablo Carbajal
>>>>> -----
>>>>> PhD Student
>>>>> University of Zürich
>>>>> www.ailab.ch/carbajal
>>>>
>>>> Hi Juan
>>>>
>>>> These two function are part of control-1.0.11, now labeled as
>>>> control-legacy [1]. The control package version 2 is now based on SLICOT
>>>> routines and supports overloaded operators (L = P * C, ...). The new
>>>> control package is more Matlab-compatible, but m-files using functions
>>>> specific to control-legacy need to be adapted to the newer control-2.x.y
>>>> package:
>>>>
>>>> Replacement for ss2tf:
>>>> sys_tf = tf (sys_ss)
>>>>
>>>> Replacement for abcddim:
>>>> [p, m] = size (sys)
>>>>
>>>> Regards,
>>>> Lukas
>>>>
>>>> [1]
>>>> http://octave.svn.sourceforge.net/viewvc/octave/trunk/octave-forge/extra/control-legacy/
>>>>
>>>>
>>>
>>> Thank you very much for the answer.
>>> I got to this because of a system identification package available in
>>> the internet http://sigpromu.org/idtoolbox/. I do not know whether to
>>> get control-legacy or modify the package. What would you suggest?
>>>
>>>
>>> --
>>> M. Sc. Juan Pablo Carbajal
>>> -----
>>> PhD Student
>>> University of Zürich
>>> www.ailab.ch/carbajal
>>
>> I'm afraid that UNIT version 3 won't run on Octave because of its graphical
>> user interface. There's no Matlab-compatible GUI support at the moment
>> (Octave 3.4.2). If you have enough stamina, you can help improving the
>> control package and/or adapt UNIT (without its GUI) to Octave.
>>
>> Regards,
>> Lukas
>>
>>
>
> Thanks for the answer,
>
> I was thinking on the non-GUI UNIT, of course. I will like to make it
> work with Octave (I almost need to do it). Now, you provide two
> possible paths, adapt control package to UNIT or vice-versa.
> It seems to me that adapting (probably extending with a couple of
> wrappers) the control package is more reasonable. What do you think?
> So far I have noticed that UNIT needs lots of functions that were in
> the old control package but are not there anymore. Is there a
> compatibility table between old control and new control packages
> available? Where could I look?
> If the table doesn't exist I can provide a list of the functions that
> UNIT is requesting and see if you can tell which ones are missing and
> which ones have other name/interface. What do you think?
>
> Regards,
>
> --
> M. Sc. Juan Pablo Carbajal
> -----
> PhD Student
> University of Zürich
> www.ailab.ch/carbajal
Matlab exists since three decades and has many outdated commands which
Mathworks doesn't list on their website any longer, but somehow people keep
using them.
Examples are:
[num, den] = ss2tf (a, b, c, d)
step (num, den)
bode (a, b, c, d)
More recent editions of the control systems toolbox support "systems",
therefore you don't need to juggle with state-space matrices or polynomial
vectors. When I started to rewrite the control package, I decided to focus my
efforts on the current set of commands. Neglecting antique commands also
simplifies the code.
Maybe you want to create a package like "control-stone-age-commands" and
provide some wrappers e.g.
function [num, den] = ss2tf (varargin)
[num, den] = tfdata (ss (varargin{:}));
endfunction
Regards,
Lukas
PS: List of available functions:
http://octave.sourceforge.net/control/overview.html
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