Re: [ROOT] Fitting Parameter Limits....

From: Eddy Offermann (eddy@rentec.com)
Date: Thu Aug 29 2002 - 17:46:55 MEST


Hi Ray,

Optimizing with a function like "([0]*x+[1])/[2]" is not a reasonable
thing to do. The matrix of this problem will be singular,because
of the correlation between [2], [0] and [1]. Better use [0]*x+[1].

I know this does not answer your question but it avoids it :-)

Eddy

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> Date: Thu, 29 Aug 2002 11:01:37 -0400 (EDT)
> From: Ray Fliller III <rfliller@bnl.gov>
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> Subject: [ROOT] Fitting Parameter Limits....
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> 
> 
>    Hello Rooters,
> 
>      Is there a way in root to do a fit with a TF1, and have the limit of
>    one parameter to be another parameter.
> 
>    For expample if my TF1 is "([0]*x+[1])/[2]", how can I make it so that
>    during the fitting process p1>p2 for whatever p2 is during the fit.
> 
> -- 
> 
>  RAINMAN
>       "How much does a piece of gum cost Ray?"
>       "About $100."
>       "How much does a new car cost Ray?"
>       "`Bout $100."
>       "There goes working for NASA!"
> 
> ==================================================================
> Ray Fliller: rfliller@bnl.gov      Office Phone: (631)-344-6124 
> C-A Accelerator Physics            Dept. Fax: (631)-344-5954
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> 
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> ==================================================================
> 

Eddy A.J.M. Offermann
Renaissance Technologies Corp.
Route 25A, East Setauket NY 11733
e-mail: eddy@rentec.com
http://www.rentec.com



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