Hi Gail, An example { TH1F h("h","test",100,-2,2); h.FillRandom("gaus",1000); h.Fit("gaus"); const int npar = 3; TMatrixD matrix(npar,npar); gMinuit->mnemat(matrix.GetElements(),npar); matrix.Print(); matrix.Draw("text"); } Rene Brun On Wed, 4 Dec 2002, Gail Ruby wrote: > Dear Rooters, > > I am running version 3.03/09 on a Linux maxhine. > > After doing my fit using TF1::Fit: > > root [15] TF1 *ff = new TF1("ff", "gaus+pol3(3)", 1.78, 1.95) > root [16] ff->SetParameters(hsD0Mass1->GetMaximum(), 1.862, 0.006, 1, 1,1, 1) > root [17] hsD0Mass1->Fit("ff") > > > I typed in the following: > > root [18] const int npar =7; doublematrix[npar][npar]; gMinuit->mnemat(&matrix[0][0],npar); > root [19] > > The return provided nothing. > > How do I get a display on the screen of the error matrix? > > Thanks, > Gail Ruby >
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