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Re: DAE daspk solver problem
From: |
Sebastian Schöps |
Subject: |
Re: DAE daspk solver problem |
Date: |
Thu, 27 Oct 2016 23:18:24 -0700 (PDT) |
Lazy_Tom wrote
> I don't know why DAE solvers index capabilities are not reported in Octave
> manual. Matlab at least tells you that you can go no further than index 1
> (at least without doing some "magic"...)
You are right. Feel free to oben a bug report at savannah, maybe immediately
suggesting a string that can be added to the help. However, I assume that
dassl and daspk will be deprecated in some future version since we are
moving to odeXY compatible solvers.
Lazy_Tom wrote
> about the paper you cited, yup, I'm aware of it and I agree, it is quite
> nice.
> Well, at least I'll gave it a try, I think that for DAE problems I'll move
> to openModelica
I think that ode5r from odepkg should be able to solve index3 problems since
its based on Radau 5 [1]. We hope to have a new release of odepkg quickly
after Octave 4.2. I will keep in mind to include such information in the
help.
Regarding openModelica: yes, they do some clever tricks for higher index. As
far as I recall it's based on dummy derivatives [2]. Such stuff is easier
for modelica since it is in some sense a symbolic language. However, to my
best knowledge, it is not really well suited for big problems. So, as usual,
the best choice depends on what you want to do :)
Seb.
[1] http://www.unige.ch/~hairer/prog/stiff/radau5.f
[2] http://dx.doi.org/10.1137/0914043
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- DAE daspk solver problem, Lazy_Tom, 2016/10/26
- Re: DAE daspk solver problem, Sebastian Schöps, 2016/10/27
- Re: DAE daspk solver problem, Lazy_Tom, 2016/10/27
- Re: DAE daspk solver problem,
Sebastian Schöps <=
- Re: DAE daspk solver problem, Bill Greene, 2016/10/28
- Re: DAE daspk solver problem, Lazy_Tom, 2016/10/29
- Re: DAE daspk solver problem, Sebastian Schöps, 2016/10/29
- Re: DAE daspk solver problem, Lazy_Tom, 2016/10/29
- Re: DAE daspk solver problem, Sebastian Schöps, 2016/10/29
- Re: DAE daspk solver problem, Lazy_Tom, 2016/10/29
- Re: DAE daspk solver problem, SunilShah, 2016/10/28
- Re: DAE daspk solver problem, Bill Greene, 2016/10/28
- Re: DAE daspk solver problem, SunilShah, 2016/10/28
- Re: DAE daspk solver problem, c., 2016/10/29