Hi, I have been using root 3.04/02 and am having problems with TH2F::SetContour. I want one contour on my plot(LnL) at z=2.3 so I do: root [25] Double_t ilevel[1]={2.3} root [26] LnL->SetContour(1, ilevel) root [31] LnL->GetContour(ilevel) (Int_t)1 root [32] ilevel[0] (Double_t)2.29999999999999982e+00 root [33] LnL->Draw("cont0") //// This produces an empty plot. ///also root [37] LnL->GetContour(ilevel) (Int_t)1 root [38] ilevel[0] (Double_t)0.00000000000000000e+00 Drawing seems to reset the contonur levels I also tried using several different contour levels: Double_t ilevel[3]={0.0, 2.3, 5.0} root [26] LnL->SetContour(3, ilevel) I draws 3 contours at what looks like equally spaced z values. Cheers Caius ________________________________________ - CAIUS HOWCROFT - - +44 (0)1223 764 128 UK(office) - ========================================
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