[ROOT] Determine Number of Events from Fit

From: Gail Ruby (rubyg@utdallas.edu)
Date: Tue Oct 15 2002 - 23:26:32 MEST 

Dear ROOT,

I have fit a user defined function to my histogram
and want to determine the number of events.

This is an example of the statistics provided
by ROOT:

FCN=123.037 FROM MIGRAD    STATUS=CONVERGED     248 CALLS         249
TOTAL
                     EDM=4.00443e-07    STRATEGY= 1  ERROR MATRIX
UNCERTAINTY   2.3 per cent
  EXT PARAMETER                                   STEP         FIRST   
  NO.   NAME      VALUE            ERROR          SIZE      DERIVATIVE 
   1  p0           2.45000e+03   3.35254e+01  -8.16812e-02   2.34887e-06
   2  p1           1.86271e+00   9.63489e-05   6.31083e-07  -7.22575e+00
   3  p2           6.97904e-03   1.01692e-04   5.32488e-08  -8.57834e-01
   4  p3           4.26596e+03   6.04316e+01   2.02481e-01   1.19979e-04
   5  p4           9.53409e+02   1.09962e+01   3.78864e-02  -1.15613e-04
   6  p5          -1.93792e+02   5.89416e+00  -1.78104e-02  -2.04623e-04
   7  p6          -4.73612e+02   9.12748e+00  -2.99322e-02   7.74198e-04

Thank-you
Gail Ruby

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