TF1::Fit

From: Faouzi Attallah (attallah@clri6a.gsi.de)
Date: Mon Jan 11 1999 - 14:16:07 MET


Hi Rooters,

I am fitting a histogram hyds with a gaussian according to :

     g = new TF1("g","gaus",gmin, gmax);
     hyds->Fit("g","ER0");
     g->GetParameters(par);
     hyds->Draw() ;

I got the following on my root-command-screen

 FCN=66.6685 FROM MINOS     STATUS=PROBLEMS     1282 CALLS        1694
TOTAL
                     EDM=2.55251e-05    STRATEGY= 2      ERROR MATRIX
ACCURATE 
  EXT PARAMETER                  PARABOLIC         MINOS ERRORS        
  NO.   NAME      VALUE            ERROR      NEGATIVE      POSITIVE   
   1  Constant     1.47776e+02   4.41311e+00  -3.80487e+00   3.80193e+00
   2  Mean        -2.83708e-04   3.83873e-04  -3.99915e-04   3.99098e-04
   3  Sigma        1.52598e-02   2.16818e-06                            

but on the graphics an information-window is appearing with the 
hist- parameters (I do believe) not the fit ones :
	
	hyds
	Nent = 1600
	Mean = -0.00539024
	RMS = 0.14343

is it a bug ?


Faouzi



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