Re: Problem in Minuit

Dear Virender,   

I would suggest you to try following and see if the results change:

1_ Fix one of the parameters(probably the one that stays at lower

       end), limit other two and do the fit. 2_Release the parameter, and fix the other one and again do the fit.

A Singh   

• Original Message ----- From: vicky mangat <mangat_phy_at_yahoo.co.in> Date: Friday, August 14, 2009 12:27 pm Subject: [ROOT] Problem in Minuit To: roottalk_at_root.cern.ch

>
> Hi
> I was try to fit a function using Minuit. I am able to write
> program for this and it is excuting very well. But i have found few
> problem in this.
> 1. Quality of fit is poor. I have a attached root file of plot you
> can see it.
> 2. Secondly I have found that value of my first parameter always
> fix at lower limit applied by me.
> 0.1 3.4412897 2.530768 2.5043414
> 329.21223
> chi2: 329.21223
> The Chi2/ndf is: 8.8976279
> Here i have given limit 0.1 to 6 on first parameter.
> Now if i change this limit say 2 to 6 then parameters are
> 2 2.2054358 2.530847 2.5044359
> 329.51952
> chi2: 329.51952
> The Chi2/ndf is: 8.905933
>
> 3. My chi2 per degree of freedom is found to be high . Can i
> imporve it.
> I have attached all program files and data file so that i
> you want you can run in on ur own pc.
> Thankx.
>
>
> Varinderjit Singh
>
> Research Scholar
>
> Dept. of Physics
>
> Panjab University
>
> Chandigarh
>
> 09914100789
>
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Received on Sun Aug 16 2009 - 09:55:24 CEST