How to set the order of the histograms of histogram-stack according to the ascending order of the integrals of the individual histograms in the histogram-stack?

ROOT
,
1

how to set the order of the histograms of histogram-stack according to the ascending order of the integrals of the individual histograms in the histogram-stack?

2

You have to add them in the order you want.

3

so are you telling that there is no shortcut command to set the order in the ascending order of integrals of the background?i have 4 backgrounds.To keep in ascending order i know that i can use if else condition while adding.I was seeking for some shortcut method.So if you know some command please help me out in this.

4

In a THStack the histograms are ordered in the order you added them in the stack. Up to you to put them is the correct order.

5

@couet Do you know any ROOT “collection class” with which users could define their own “compare” function and then use a class built-in “sort” method?

6

I not aware of a such tool in ROOT. TList has a sort method but it does not allow to define its own “compare” method. May be @pcanal or @axel know.

7 
std::vector<TH1*> hists;
std::sort(hists.begin(), hists.end(), [](TH1* hist1, TH1* hist2) { return hist1->GetEntries() > hist2->GetEntries(); });
for (TH1* hist: hists)
  hStack.Add(hist);

should do!

8

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