Re: [bug #6511] Ambiguous minimisation options -- August 04, 2006 - 17:48

Sure, just amending the docs will fix things. The other option is to
rename one or both options to something a bit more specific. Either one
will work, do whatever you prefer.

Chris

On Sat, 2006-08-05 at 00:53 +1000, Edward d'Auvergne wrote:
> For bug number #6511 at
> http://gna.org/bugs/?func=detailitem&item_id=6511, the Hessian takes
> precedence over the line search.  Hence supplying the option 'none'
> with the Newton line search minimisation should set the algorithm to
> an unmodified Hessian.  Supplying 'none' twice will turn off the
> Hessian modification and no step length selection (or line search)
> will be performed.  Chris, do you think that simply stating this
> precedence within the 'minimise()' docstring will cover the issue?
> Only Newton minimisation uses both a line search and the Hessian.
>
> Edward
>
>
> On 8/4/06, Chris MacRaild <NO-REPLY.INVALID-ADDRESS@xxxxxxx> wrote:
> > URL:
> >   <http://gna.org/bugs/?func=detailitem&item_id=6511>
> >
> >                  Summary: Ambiguous minimisation options
> >                  Project: relax
> >             Submitted by: macraild
> >             Submitted on: Thursday 08/03/2006 at 14:18
> >                 Category: None
> >                 Priority: 5 - Normal
> >                 Severity: 3 - Normal
> >                   Status: None
> >                  Privacy: Public
> >              Assigned to: None
> >          Originator Name:
> >         Originator Email:
> >              Open/Closed: Open
> >                  Release: Repository: 1.2 line
> >         Operating System: None
> >
> >     _______________________________________________________
> >
> > Details:
> >
> > When performing Newton minimisation (perhaps other algorithms too?), the
> > minimisation option 'none' has ambiguous meaning. In practise it performs 
> > a
> > minimisation without Hessian modifications, but according to the docs, 
> > could
> > equally mean with no line-search.
> >
> >
> >
> >
> >
> >
> >     _______________________________________________________
> >
> > Reply to this item at:
> >
> >   <http://gna.org/bugs/?func=detailitem&item_id=6511>
> >
> > _______________________________________________
> >   Message sent via/by Gna!
> >   http://gna.org/
>
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