Marco, If you look at the example in $ROOTSYS/tutorials/fitcont.C, you will see two TGraphs created. each TGraph containing the contour points for a degree of confidence. These graphs are drawn. You can also see the points printed if you do gr1->Print(); gr2->Print(); Rene Brun Marco Kienzle wrote: > > Dear ROOT users, > > following a previous message I send last year concerning plot of the 95% > confidence interval of two estimates, I am wondering now if there is a > way to retrieve the values of the boundaries of the confidence interval > in order to output them in a text file: any suggestion ? > > cheers, > marco > > Hi Marco, > > marco kienzle wrote: > > > > Dear rooters, > > > > I am a new user of ROOT and didn't find answers to the following questions > > in the RootTalkDigest: > > - How do I get the variance-covariance matrix of the fit of a function to an > > histogram (TH1F) when I use the method Fit (hist->Fit("func");) ? > > double matrix[n][n]; > use gMinuit->mnemat(matrix,n); > > > - Is there a method to draw 95% confidence interval of the prediction of the > > fitted function ? > > > use gMinuit->mncont > see an example in $ROOTSYS/tutorials/fitcont.C > > Rene Brun > > > thanks in advance, > > marco > -- > ____________________________________________________________________________ > > Marco Kienzle > Fisheries Research Services > Marine Laboratory > PO Box 101 Victoria Road > Aberdeen AB119DB > United Kingdom > > direct: +44 (0) 1224 295421 > tel: +44 (0) 1224 876544 > fax: +44 (0) 1224 295511 > http://www.marlab.ac.uk Marco,
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