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[cellml-discussion] ABI CellML Meeting Minutes, 21st April 2010


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  • From: alan.garny at dpag.ox.ac.uk (Alan Garny)
  • Subject: [cellml-discussion] ABI CellML Meeting Minutes, 21st April 2010
  • Date: Mon, 26 Apr 2010 09:17:27 +0100
Then, the approach that I would personally take (and the one that I people
take when solving ODE models, though I accept things might be different with
DAE models!) is to start from the original ICs and let the solver do its
job. Now, I imagine there might be cases where user changes to some of the
parameters are such that the original ICs might not be suitable at all?

Alan

> -----Original Message-----
> From: cellml-discussion-bounces at cellml.org [mailto:cellml-discussion-
> bounces at cellml.org] On Behalf Of Randall Britten
> Sent: 25 April 2010 22:54
> To: 'CellML Discussion List'
> Subject: Re: [cellml-discussion] ABI CellML Meeting Minutes, 21st April
2010
>
> Andrew pointed out some time ago that even if consistent IC's are provided
> by the model author, one of the things we often do with models is change
> some of the parameters, or re-use the models in a different context, in
which
> case some assistance from the software in recalculating new consistent
IC's is
> invaluable.
>
> Regards,
> Randall
>
> > -----Original Message-----
> > From: cellml-discussion-bounces at cellml.org [mailto:cellml-discussion-
> > bounces at cellml.org] On Behalf Of Alan Garny
> > Sent: Friday, 23 April 2010 11:43 p.m.
> > To: 'CellML Discussion List'
> > Subject: Re: [cellml-discussion] ABI CellML Meeting Minutes, 21st
> > April
> 2010
> >
> > But aren't or, rather, shouldn't ICs be provided by the model developer?
> Or
> > is it the case that you want to be able to determine the ICs, should
> > the model developer not have provided some? Then again, if no ICs have
> > been provided, then this would be a shortcoming of the model, and
> > rather than trying to determine some ICs, we should try to get the ICs
> > from the model author. Just thinking 'aloud', so sorry if I am missing
> > something obvious here (not least because I have never 'played' with
DAEs
> myself).
> >
> > Alan
> >
> > > -----Original Message-----
> > > From: cellml-discussion-bounces at cellml.org
> > > [mailto:cellml-discussion- bounces at cellml.org] On Behalf Of Randall
> > > Britten
> > > Sent: 23 April 2010 12:35
> > > To: CellML Discussion List
> > > Subject: Re: [cellml-discussion] ABI CellML Meeting Minutes, 21st
> > > April
> > 2010
> > >
> > > DAEs are a little more complex, it isn't always obvious which
> > > unknowns require initial conditions, or how to ensure ICs are
consistent.
> > >
> > > Regards,
> > > Randall
> > >
> > > On 23/04/2010, at 8:50 PM, "Alan Garny" <alan.garny at dpag.ox.ac.uk>
> > > wrote:
> > >
> > > > Sorry, one more (non-OpenCell) comment:
> > > > - "... the biggest problem is using IDA's default solver for
> > > > initial conditions..." -- What is exactly meant by solver for
> > > > initial conditions? Do you mean that you are trying to use IDA to
> > > > determine what the initial value of the state variables should
> > > > (i.e. like those
> > > > 99 guesses in the original OpenCell DAE solver?)? I would
> > > > think/hope not (I thought we had 'agreed' to provide the initial
> > > > conditions to the solver?).
> > > >
> > > > Alan
> > > >
> > > >> -----Original Message-----
> > > >> From: cellml-discussion-bounces at cellml.org
> > > >> [mailto:cellml-discussion- bounces at cellml.org] On Behalf Of
> > > >> Dougal Cowan
> > > >> Sent: 22 April 2010 21:19
> > > >> To: CellML Discussion List
> > > >> Subject: [cellml-discussion] ABI CellML Meeting Minutes, 21st
> > > >> April
> > > >> 2010
> > > >>
> > > >> I have put the minutes from this week's meeting up at:
> > > >>
> > > >> http://www.cellml.org/community/meeting/minutes/2010/04.21
> > > >>
> > > >> Thanks,
> > > >> Dougal
> > > >>
> > > >> _______________________________________________
> > > >> cellml-discussion mailing list
> > > >> cellml-discussion at cellml.org
> > > >> http://www.cellml.org/mailman/listinfo/cellml-discussion
> > > >
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