Re: future development of the control package

[Reza Housseini]

Hello guys

Yes we should definitely do a code sprint on top of your great work!

Shall we just announce it and then try to choose a date?

Cheers Reza

On Sat, Oct 31, 2015 at 2:46 PM, JuanPi <address@hidden> wrote:

On Sat, Oct 31, 2015 at 2:19 PM, Lukas Reichlin
<address@hidden> wrote:
> Hi Thomas,
> dear Octave community,
>
> On Friday morning, I have published control-3.0.0, the first major release after control-2.0.0 in early 2011. I’m very pleased with the outcome [1] and hope that it finds general approval. However, its development process during October 2015 was freelancing/a solo run and I did not include you in the decision process. For future releases, I would like to improve this and involve especially you (as co-author), but also other contributors (therefore CC’ing maintainers list), more into decision making. Appreciation and an attempt to increase the bus factor are two of the reasons for this step.
>
> Regarding control-3.0.1, I propose the following changes:
> - Your work on tf2ss conversion
> - Accepting only finite values as inputs, see bug #46330.  <http://savannah.gnu.org/bugs/?46330>
> - Fix problems with "algebraic loops» (as Matlab calls this) as outlined in [2].
>
> Regarding the third point, I wonder whether it’s possible to apply some kind of state transformation if matrice A is not invertible in the equation below. (such that C A^-1 B can be computed)
>
> y = [D - C A^-1 B] u
>
>
> For the mercurial repository, I propose the creation of a second branch (besides default), named stable, similar to Octave.
> I have tried to merge control-3.0.0 into your control-time-delay repo, but I had to give up. There were simply too many conflicts. Maybe it’s better when I create a «delay» branch in the control repo and you copy-paste your changes there? I could start by integrating your oct-files into a single __control_delay_functions__.oct.
> Shall we create this delay branch before or after realizing the array feature? (see bug #45314, <http://savannah.gnu.org/bugs/?45314>). Please don’t feel pressed for an answer, we could discuss such topics in meeting, see the next paragraph.
>
>
> Finally, I would like to propose a meeting in real life. Since you’re still working at ETH Zurich and we haven’t met for quite a while, what do you think about a meeting in one of its cafeterias (in November)? Fellow Swiss residents (JuanPi, Reza) are welcome as well!
>
> Best regards,
> Lukas
>
> [1]
> http://sourceforge.net/p/octave/control/ci/default/tree/NEWS
>
> [2]
> http://sourceforge.net/p/octave/control/ci/default/tree/devel/algebraic_loops.m
>
>
>

Hi Lukas,

Thanks for the initiative. With Reza we have been trying to organize a
local code-sprint since our return from OctConf but so far we haven't
come to it. Maybe we should take your initiative and build up on this.

Cheers


--
JuanPi Carbajal
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