Hi Gail, What do you mean by "determine the number of events"? Do you mean the integral of the fit function in some range? If this is the case, see an example at $ROOTSYS/tutorials/myfit.C Look at the call to TF1::Integral Rene Brun On Tue, 15 Oct 2002, Gail Ruby wrote: > 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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