Problem in Minuit

From: vicky mangat <mangat_phy_at_yahoo.co.in>
Date: Fri, 14 Aug 2009 12:26:59 +0530

 
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 Fri Aug 14 2009 - 08:57:05 CEST