Re: fitting, step

On Wed, Jul 07, 2010 at 19:46 -0400, Maurice Leutenegger wrote:
>  Mike, Dave, John,
>
> thanks for your suggestions. I tried changing the fit method to subplex,  
> and it was able to fit correctly. But lmdif doesn't work at all. So for  
> now I will use subplex for my fitting, but let's continue to work on  
> getting lmdif to work as well, because there's no reason it shouldn't.

For what it's worth, lmdif was recently removed from isis
(as of isis-1.5.0-28) and replaced with mpfit.

This was done primarily because mpfit has better support for
enforcing bound constraints on fit parameters. With lmdif, isis
enforced bound constraints using a crude hack that sometimes
failed in the way that you're seeing -- the optimizer failing
to move away from the initial parameter values.

What version of isis are you using?

Thanks,
-John
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