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Re: Random timing results with 'fsolve'
From: |
Olaf Till |
Subject: |
Re: Random timing results with 'fsolve' |
Date: |
Wed, 12 Oct 2011 16:53:36 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Wed, Oct 12, 2011 at 04:21:57PM +0200, Søren Hauberg wrote:
> ons, 12 10 2011 kl. 14:02 +0000, skrev bpabbott:
> > It does look strange.
> >
> >
> > Have you looked at the 2nd (function values) and 3rd (termination
> > status) outputs of fsolved?
>
> Hmm, okay... it seems like the algorithm converges to different solution
> each time. The problem I'm solving is under-determined so it does not
> surprise me that the solver can converge to different solutions, but I
> am surprised that this happens when the solver is given the same
> starting conditions. Does 'fsolve' perform any random steps?
>
> Søren
Wild guess: hardware floating point randomness (maybe due to
differences between processor cores?) which has only "negligible"
effect on accuracy, but could change the course of optimization in
under-determined problems...
Olaf
- Random timing results with 'fsolve', Søren Hauberg, 2011/10/12
- Re: Random timing results with 'fsolve', bpabbott, 2011/10/12
- Re: Random timing results with 'fsolve', Søren Hauberg, 2011/10/12
- Re: Random timing results with 'fsolve', bpabbott, 2011/10/12
- Re: Random timing results with 'fsolve', Søren Hauberg, 2011/10/12
- Re: Random timing results with 'fsolve',
Olaf Till <=
- Re: Random timing results with 'fsolve', Søren Hauberg, 2011/10/12
- Re: Random timing results with 'fsolve', Olaf Till, 2011/10/12
- Re: Random timing results with 'fsolve', Sergei Steshenko, 2011/10/12
- Re: Random timing results with 'fsolve', Francesco Potortì, 2011/10/12
Re: Random timing results with 'fsolve', Martin Helm, 2011/10/12