Re: [Quantlib-dev] Optimizer Discussion

[Dima <dim...@go...>]

Why exception? It has its use when LM is used. Or do youwant to make it
virtual and throw an exception if its not
overwritten?

Had a look at the optimizers. Just a few End-Criterias
are really checked.

2009/9/11 Luigi Ballabio <lui...@gm...>

> On Sat, 2009-09-05 at 13:07 +0200, Dima wrote:
> > 1: CostFunction::values()
> >
> > As far as I see, the values function is not needed anywhere, except in
> > the Levenberg Marquardt optimizer. Can we change it from a pure
> > virtual function to a virtual which by default returns a one
> > dimensional array with values(x)?
>
> Possibly, but I'd rather change it to a function which by default throws
> an exception.  Also because it wouldn't be easy for LM to check that
> it's been overridden.
>
> > 2. EndCriteria:
> >
> > Most of the functions do not use all of the passed values. [...]
> > I think it might be better to make this clean such that the user
> > doesn't have a wrong impression, that actually everything is checked.
>
> Yes, we should document that.  Have you looked at the solvers already?
> Do you have a list of what's checked in what solver?
>
> Later,
>        Luigi
>
>
> --
>
> Hanlon's Razor:
> Never attribute to malice that which is adequately explained
> by stupidity.
>
>
>