Dear Rene,
I'll revise my question. I have 4 different files say "file1.root",
"file2.root","file3.root", and "file4.root". Suppose each file contains a
tree "T1". Variables stored in "T1" are Evis, Pt, Pl, etc. I want to
superimpose each of these variables in a histogram for my
background analysis. I need it because i'm formulating a selection
criteria. What i want is for example all the Evis's from each of the 4
files is superimposed in a histogram, and so on. I want to distinguish
each of them by putting a line color.
I hope it is clear now. Thank you for your help.
Dennis
On Tue, 29 Jan 2002, Rene Brun wrote:
> Dennis,
>
> It is not completly clear what you want to do. Here is a solution
> to my interpretation of your question:
>
> TChain *MakeChain(const char* name) {
> TChain *chain = new TChain(name);
> chain->AddFile("file1.root");
> chain->AddFile("file2.root");
> chain->AddFile("file3.root");
> chain->AddFile("file4.root");
> return chain;
> }
> void test() {
> TChain *chain1 = MakeChain("T1");
> chain1->Draw("x");
> TChain *chain2 = MakeChain("T2");
> chain2->Draw("x","","same");
> TChain *chain3 = MakeChain("T3");
> chain3->Draw("x","","same");
> }
>
> Rene Brun
>
> Dennis C. Arrogancia wrote:
> >
> > Dear ROOTERS,
> >
> > I have 4 different files say f1.root, f2.root, f3.root, and f4.root.
> > Each file contains three trees, "T1","T2", and "T3". I want to compare it
> > by superimposing the variables in each of the trees from the 4 files and
> > draw it in a histogram. How can i do it? Can anyone give me an example?
> >
> > dennis
>
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