Re: Random timing results with 'fsolve'

[Søren Hauberg]

ons, 12 10 2011 kl. 16:53 +0200, skrev Olaf Till:
> 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...

Could be. Do you have any idea on how to determine if this is indeed the
case?

Søren