Hello,
I have written a fitting routine using the Minuit2Minimizer that converges successfully and yet aborts due to a failed assertion when Miniut2Minimizer::X() is called. I know that it fails because the guts of the method gets the MnUserParameters vector and this seems to have a different size than the dimension of Minuit2Minimizer.
Fitting Results
Iteration : 0
Parameters initialized to:
Index name value val_err
0 a 5.00e-01 1.00e-01
1 b 1.63e-01 1.00e-01
2 c -2.17e-01 1.00e-01
3 d 9.47e-01 1.00e-01
Minuit2Minimizer: Minimize with max-calls 1000 convergence for edm < 0.1 strategy 1
MnSeedGenerator: for initial parameters FCN = 380.615
MnSeedGenerator: Initial state: - FCN = 380.6151324595 Edm = 684.665 NCalls = 17
VariableMetric: start iterating until Edm is < 0.0002
VariableMetric: Initial state - FCN = 380.6151324595 Edm = 684.665 NCalls = 17
VariableMetric: Iteration # 1 - FCN = 10.77669015462 Edm = 16.4275 NCalls = 29
VariableMetric: Iteration # 2 - FCN = 1.9575847631 Edm = 0.115871 NCalls = 39
VariableMetric: Iteration # 3 - FCN = 1.245981019195 Edm = 0.00703602 NCalls = 50
VariableMetric: Iteration # 4 - FCN = 1.119808716821 Edm = 3.33602e-18 NCalls = 62
VariableMetric: After Hessian - FCN = 1.119808716821 Edm = 3.40971e-18 NCalls = 85
Number of iterations 6
----------> Iteration 0
FVAL = 380.61513246 Edm = 684.665327635 Nfcn = 17
Error matrix change = 1
Parameters : p0 = 0.499742 p1 = 0.16291 p2 = -0.217382 p3 = 0.947201
----------> Iteration 1
FVAL = 10.7766901546 Edm = 16.4274627426 Nfcn = 29
Error matrix change = 0.605944
Parameters : p0 = 9.73973 p1 = 14.9479 p2 = 1.25801 p3 = 3.67853
----------> Iteration 2
FVAL = 1.9575847631 Edm = 0.115871474975 Nfcn = 39
Error matrix change = 0.407127
Parameters : p0 = 9.8348 p1 = 15.2214 p2 = 2.26586 p3 = 0.554465
----------> Iteration 3
FVAL = 1.2459810192 Edm = 0.00703601772242 Nfcn = 50
Error matrix change = 0.538188
Parameters : p0 = 8.44776 p1 = 17.4563 p2 = 2.3808 p3 = 0.596536
----------> Iteration 4
FVAL = 1.11980871682 Edm = 3.3360179237e-18 Nfcn = 62
Error matrix change = 0.649003
Parameters : p0 = 8.08661 p1 = 17.4538 p2 = 3.02516 p3 = 2.89839
----------> Iteration 5
FVAL = 1.11980871682 Edm = 3.40971036027e-18 Nfcn = 85
Error matrix change = 0
Parameters : p0 = 8.08661 p1 = 17.4538 p2 = 3.02516 p3 = 2.89839
Minuit2Minimizer : Valid minimum - status = 0
FVAL = 1.11980871682085215
Edm = 3.40971036027127066e-18
Nfcn = 85
a = 8.08661 +/- 1.99228
b = 17.4538 +/- 2.76025
c = 3.02516 +/- 1.85211
d = 2.89839 +/- 6.56687
RandomFitter: /usr/local/root/math/minuit2/src/Minuit2Minimizer.cxx:469: virtual const double* ROOT::Minuit2::Minuit2Minimizer::X() const: Assertion `fDim == paramsObj.size()' failed.
AbortedI also know that I set 4 variables, as the output of PrintResults() shows, but Minuit2Minimizer::NDim() returns 2. Somehow two of my variables are either “forgotten” by MnUserParameters or never get added.
Any ideas?
Thanks in advance.