Steven, Could you send me (not to the list please), what I requested in my first mail: a working script that I can use to understand your problem and a few explanations? Rene Brun On Tue, 18 Mar 2003, steven staelens wrote: > root Version 3.05/01 on Intel Linux RH 7.1 > > > Hi Rene, > > Rene Brun wrote: > > > Hi Steven, > > > > For making a TGraph out of a TTree, see section: > > "How to obtain more info from TTree::Draw" > > in the documentation of TTree::Draw at: > > http://root.cern.ch/root/htmldoc/TTree.html > > > > Concerning your question about making a TGraph out of a TF2, > > I do not understand what you mean. There is a mismatch with dimensions. > > > > I also concluded this fact, which rules out the possibility of using > multigraphs to avoid the autoscaling problem, right ? I still haven't solved > the problem yet (...although I'm trying). Do you perhaps have another > suggestion to solve my particular 2dfit problem (a typical example is in the > 2dfit.gif file of a former mail I've posted), in particular to avoid the > autoscaling ? > > many thanks for your first reply, > > best regards, > > Steven > > > > > Rene Brun > > > > steven staelens wrote: > > > > > > root Version 3.05/01 on Intel Linux RH 7.1 > > > > > > Hi , > > > > > > In addition to a former mail I narrowed my problem down to the > > > following: > > > > > > I have fitted a twodimensional function to a twodimensional histogram as > > > it should following ROOT user guide lines. The fit seems to be OK, but > > > to be really sure I have to plot it on top of the lego plot of the > > > histogram. When I do so, the maximum value of my histogram is set equal > > > to the maximum of my 2D fit. In my case, this is absolutely not > > > wanted. I've read on the ROOT digest that this is normal and that it > > > can be solved by using a MultiGraph. > > > > > > Being a ROOT newbie however I don't know how to switch the drawings of > > > my TF2 and of my TH2F into a TGraph. I've tried in the following > > > pathetic way: > > > > > > TGraph *f2D = new TGraph() > > > h2D->Draw(">>t1") > > > > > > but I realize this is not the way it should be. > > > > > > Can somebody perhaps help me out by giving an example on how to change a > > > 2D histogram drawing into a TGraph object and the same question for a > > > twodimensional function. When this is solved I can then easily do: > > > > > > TMultigraph *mg = new TMultiGraph() > > > mg->Add(gr1) > > > mg->Add(gr2) > > > mg->Draw() > > > > > > and my problem will be solved. > > > > > > Thanks in advance, > > > > > > best regards, > > > > > > Steven > > > > > > S. Staelens > > > Ghent University > > > ELIS / Medisip > > > Proeftuinstraat 86 > > > B-9000 Gent > > > tel. 0032 9 264 66 28 > > > fax. 0032 9 264 66 18 > > > email: Steven.Staelens@rug.ac.be >
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