# Re: several cuts

From: Boris Skorodumov <bskorodo_at_nd.edu>
Date: Sat, 12 Mar 2005 16:33:06 -0500

Thank you Rene,

but the question was about optimal solution to do it. for example, i have 15 cuts in one plot. it means i should repeat the same peace of code 15 times. is it possible to orginize loop somehow ?

i was thinking to do it in the next way: ......

for(int i = 0; i< 15; i++)
{
string name[i] = "cut" + convert(i);

```  cut[i] -> SetName(name[i].c_str()); ??????
cut[i] -> SetVarX("x");
cut[i] -> SetVarY("y");
??????????????????
```

}

t->Draw("x >> histo","???????????????");

string convert(int number)
{
stringstream s;
s << number;
return s.str();
}
..............

Or maybe there is different method to do it ?

Thank you very much,

Boris.

```| Boris Skorodumov, Graduate Student |
| Physics Department                 |
| University of Notre Dame           |
| Indiana 46556, USA                 |
| WWW:   http://www.nd.edu/~bskorodo |
--------------------------------------

```

Rene BRUN wrote:

>Hi Boris,
>
>See a simple example in the attachement
>
>Rene Brun
>
>On Fri, 11 Mar 2005, Boris
>Skorodumov wrote:
>
>
>
>>Dear Rooters,
>>
>>if i would like to make several gcuts on 2d histogram and later to make some
>>projection on 1d histo, what is the best way to do it ?
>>
>>one way is:
>>
>> cut1 -> SetName("cut1");
>> cut1 -> SetVarX("x");
>> cut1 -> SetVarY("y");
>>
>> cut2 -> SetName("cut2");
>> cut2 -> SetVarX("x");
>> cut2 -> SetVarY("y");
>>
>>........ and so on
>>
>>t->Draw("x >> histo","cut1 || cut2 ||...");
>>
>>but i am sure, it should be the way to orginize loop.
>>
>>thank you.
>>boris.
>>
>>
>>
>>------------------------------------------------------------------------
>>
>>//file twocuts.C
>>void twocuts() {
>> //example of two graphical cuts on a 2-d histogram
>> //used as cuts when making a Tree projection
>> //file hsimple.root generated by ROOT tutorial hsimple.C
>> TFile *f = TFile::Open("hsimple.root");
>> TH2F *hpxpy = (TH2F*)f->Get("hpxpy");
>> TCanvas *c1 = new TCanvas("c1","cuts",600,800);
>> c1->Divide(1,2);
>> c1->cd(1);
>> hpxpy->Draw();
>> TCutG *cut1 = new TCutG("cut1",6);
>> cut1->SetVarX("px");
>> cut1->SetVarY("py");
>> cut1->SetPoint(0,-2.12644,1.37712);
>> cut1->SetPoint(1,-2.95977,-1.7161);
>> cut1->SetPoint(2,-0.775862,-2.94492);
>> cut1->SetPoint(3,-0.114943,-0.423729);
>> cut1->SetPoint(4,-1.52299,-0.614407);
>> cut1->SetPoint(5,-2.12644,1.37712);
>> cut1->Draw("l");
>> TCutG *cut2 = new TCutG("cut2",7);
>> cut2->SetVarX("px");
>> cut2->SetVarY("py");
>> cut2->SetPoint(0,-0.143678,2.16102);
>> cut2->SetPoint(1,-0.890805,0.783898);
>> cut2->SetPoint(2,-0.229885,-2.05508);
>> cut2->SetPoint(3,1.81034,-1.08051);
>> cut2->SetPoint(4,1.66667,1.03814);
>> cut2->SetPoint(5,0.201149,0);
>> cut2->SetPoint(6,-0.143678,2.16102);
>> cut2->Draw("l");
>>
>> c1->cd(2);
>> TNtuple *ntuple = (TNtuple*)f->Get("ntuple");
>> ntuple->Draw("px","cut1 || cut2");
>>}
>>
>>
Received on Sat Mar 12 2005 - 22:33:18 MET

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