Hi, I'm trying to get the final fit parameter values and the covariance matrix out of TVirtualFitter or TFitter. Is there no way to do this? I see Int_t GetParameter(Int_t ipar,char *parname,Double_t &value,Double_t &verr,Double_t &vlow, Double_t &vhigh) ...but this looks like a cut'n'paste of SetParameter. Why would I have to provide the initial values just to get the current one?! Should this not be Double_t GetParameter(Int_t ipar) ...with a simple inline implementation? There also appears to be *no way* to get the covariance matrix. Perhaps I should have bypassed TVirtualFitter entirely and just used TMinuit directly. This course seemed unwise to me at first, or at least non-aesthetic, but TVirtualFitter seems to lack even the basic functionality I need. If I am wrong, could somebody please tell me how to (for instance) modify the code of http://root.cern.ch/cgi-bin/print_hit_bold.pl/root/html/examples/minexam.cxx.html to get the parameters and covariance matrix with high-precision? I am looking for something similar to mnemat for the latter. - John
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