Hi Mark, The 2-d drawing routines do not draw the bin contents if the number of entries is zero. In your macro, you use SetCellContent. This function does not increment the number of entries. I will remove the return statement from the drawing routines in case nentries=0. The modified macro below works OK (in case of variable bin size, you must specified nbins+1 values in your arrays. Rene Brun { Float_t binsx[6] = { 1e-5,1e-4,1e-3,1e-2,1e-1,1 }; Float_t binsy[6] = { 1e-5,1e-4,1e-3,1e-2,1e-1,1 }; TH2F *hist2 = new TH2F("hist2","Variable bin histogram",4,binsx,4,binsy); Int_t j,k; for (j=1; j< 6; j++) { for(k=1; k < 6; k++) { hist2->SetCellContent(j,k,(Float_t)(j+k)); } } hist2->SetEntries(1); hist2->Draw("box"); } Mark Boulay wrote: > > Hello All, > I'm trying to define a 2-D histogram with variable > bin width, and then draw a contour map, using root 2.21/03. > The following code illustrates how the histogram is created: > > { > Float_t binsx[6] = { 1e-5,1e-4,1e-3,1e-2,1e-1,1 }; > Float_t binsy[6] = { 1e-5,1e-4,1e-3,1e-2,1e-1,1 }; > TH2F *hist2 = new TH2F("hist2","Variable bin histogram",5,bx,5,by); > Int j,k; > > for (j=1; j< 6; j++) > { > for(k=1; k < 6; k++) > { > hist2->SetCellContent(j,k,(Float_t)(j+k)); > } > } > } > > If I then try to draw this histogram with Draw(), only the axies are > drawn. Scanning the mouse over the pad (with Event Status on) shows > that the cells have the proper contents. If I then use > Draw("cont"), the same axies are again drawn (without contours). This > time the Event Status shows that all points inside the axies are in > cell (6,6). > > Thanks in advance for any help, > > Mark. > > > > ================================================================= > = = > = Mark Boulay = > = Department of Physics phone/voice mail: (613) 533-6861 = > = Queen's University fax: (613) 533-6813 = > = Kingston, Ontario email: mgb@sno.phy.queensu.ca = > = Canada, K7L 3N6 Office 121 (c) = > = = > =================================================================
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