Re: fitting, step

On Jul 7, 2010, at 9:22 PM, John Houck wrote:

>> So now my question is: suppose I really want to do a fit with the
>> original parameter constraints. Do I need to use subplex? Is there a way
>> to make mpfit work?
> 
> mpfit can be made to work in this situation, but I first need to
> modify the isis fit method interface to provide some additional

Is there a known reason why the narrow constraints fail in this case?  What 
exactly are you going to change that will allow this to work?  Just curious, 
since in using ISIS here in he summer school for high res spectra, I've 
noticed that mpfit *can* be a little fussy on narrow lines, unless one runs 
conf_loops and forces fits to find new, lower chi^2, and/or uses subplex.  
Either makes Monte Carlo simulations of line significances a little slower.

-Mike


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