[ROOT] busy flag problem

From: Avdhesh Chandra (avdhesh@tifr.res.in)
Date: Tue Dec 03 2002 - 13:58:48 MET 

Hi,
      I have arrays of histogram define like
  TH1F *Dca[8];
  Dca[0] = new TH1F("Dca_0"," ",24000,-1.2,1.2);
  Dca[1] = new TH1F("Dca_1"," ",24000,-1.2,1.2);
   ......    .......

    In my code when i am filling these histograms i am facing no problem,
but when i am trying to fit these histograms like

  for(Int_t i=0; i<8; i++)
    { gausfit(Dca[i],sigma,errsigma,chisq,ndf);
      Sigdca  [i] = sigma ;         Errsigdca[i] = errsigma ;
      Chisq_1a[i] = chisq;          Ndf_1a[i] = ndf ;
    }

          where gausfit is defined like
   void gausfit( TH1F *histname,Double_t &sigma, Double_t &errsigma,
	                        Double_t &chisq, Double_t &ndf)

   I am getting following error message
--------------------------------------------------------
 FCN=19.9171 FROM MIGRAD    STATUS=CONVERGED     248 CALLS         249
TOTAL
                     EDM=2.10802e-09    STRATEGY= 1      ERROR MATRIX
ACCURATE
  EXT PARAMETER                                   STEP         FIRST
  NO.   NAME      VALUE            ERROR          SIZE      DERIVATIVE
   1  Constant     1.06828e+00   6.35883e-02   1.35696e-04   8.02646e-04
   2  Mean         4.51991e-02   9.17302e-01   1.96188e-03  -5.30292e-05
   3  Sigma        1.55634e+00   1.40853e+00   9.03530e-03** at limit **
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1

 *** Break *** segmentation violation
Root > Function gausfit() busy flag cleared
Function Loop() busy flag cleared
-----------------------------------------------------------------

  This fit function works fine if I use different historgams
                       (not arrays of historgams)

  Please let me know what should be the correct way of doing this.

Thanks
Avdhesh

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