GetConfidenceIntervals with TMinuit?

Hi,

I want to use the GetConfidenceIntervals function using TMinuit. Below is a short example of what I'm trying to do. I know where is my error, but i don't know how to get it work. Is it possible to obtain the confidence interval with TMinuit? Do I have to compute it manually?

Thanks,
Martin

TMinuit* minuit = new TMinuit;
minuit->SetFCN(&Chi2);
...
minuit->Migrad();

TGraph gConf = new TGraph(50); // the graph which holds the contours TVirtualFitter* tvf = minuit->GetFitter(); //This doesn't compile... tvf->GetConfidenceIntervals(gConf,0.95); // 95% confidence interval

//Instead of the 3 lines above I also try the following but I get a
//Break - Segmentation when running.

TVirtualFitter* tvf = TVirtualFitter::GetFitter(); TGraph gConf = new TGraph(50);
(TVirtualFitter::GetFitter())->GetConfidenceIntervals(gConf,0.95); Received on Wed Jun 27 2012 - 21:07:10 CEST