Hello,
I sent already 2 messages about Minuit, but I did not get any feedback !!
Now I am experiencing several problems.
1) Minuit2 has a lot less option than TFitter has, Why I cannot
manage the max number of iterations, etc.. how can ROOT:TFitter can
ne based on minuit2 and offer more options ? Am I wrong ? arglist
offers those options !
2) Minuit does not congerve at all in some circunstancies. I
notice for example having to fit a big number : 5e12.
the fitter change the value of the parameter, calculate the chi2,
finds that it is lower, but finally keep the original value:
example:
Density: 4.90049e+12
chi2 1.01073e-05
Density: 4.89951e+12
chi2 1.03073e-05
Density: 4.9049e+12
chi2 9.23127e-06
Density: 4.8951e+12
chi2 1.12318e-05
Density: 4.949e+12
chi2 2.65485e-06
Density: 4.851e+12
chi2 2.26607e-05
Density: 4.9e+12
chi2 1.02068e-05
Density: 4.9e+12
chi2 1.02073e-05
3) When I user Strategy, 2, it crash after a couple of iterations ! ../inc/Minuit2/LASymMatrix.h:226: double& ROOT::Minuit2::LASymMatrix::operator()(unsigned int, unsigned int): Assertion `row<fNRow && col < fNRow' failed.
Should I keep using this package ?
Regards.
-- ---Received on Wed Sep 03 2008 - 01:27:50 CEST
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Patrick DUPRÉ | | Department of Chemistry | | Phone: (44)-(0)-1904-434384 The University of York | | Fax: (44)-(0)-1904-432516 Heslington | | York YO10 5DD United Kingdom | | email: pd520_at_york.ac.uk
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