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partitionHistogram.C
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partitionHistogram.C
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// This macro analyzes a TH1 to find bin ranges with equal numbers of entries.
// The heavy lifting is done by the findParitions() function, which takes a pointer
// to the TH1 and (optionally) a parameter 'delta' which specifies what fraction
// of entries to put in each group. (That is, delta = 0.01 will divide the
// histogram into equal pieces, each containing 1% of the entries.
//
// findParitions() is broken into it's own function so that you could load this macro
// with gSystem->Load("partitionHistogram.C") and call it directly.
void findParitions(TH1* hist, Float_t delta = 0.01);
void partitionHistogram(const Float_t delta = 0.01)
{
// ----------- Create a function and use it to fill some histograms --------------- //
TF1 f1("f1","gaus(0)",-3,3);
f1.SetParameters(1,0,1);
TH1F h1("h1", "Gaussian distribution", 1000, -3, 3);
h1.FillRandom("f1",10000);
findParitions(&h1,delta);
}
void findParitions(TH1* hist, Float_t delta)
{
Int_t nBins = hist->GetNbinsX();
Float_t temp = 0, sum = 0, perc = 0, lastPerc = 0, target = delta, total = (Float_t)hist->GetEntries();
for(Int_t i = 1; i <= nBins; i++)
{
temp = 0;
Double_t binContent = hist->GetBinContent(i);
sum += binContent;
temp = binContent / total;
perc = sum / total;
if(perc > target)
{
// Did we overshoot? If so: 1) Show perc from last
// iteration, and 2) do this iteration again
if( (perc - target) > (target - lastPerc))
{
sum -= binContent; // 2)
i--; // 2)
cout <<
"\nBin Center: " << hist->GetBinCenter(i) <<
"\tPerc: " << lastPerc /* 1) */ <<
"\tTarget: " << target;
} else { // ... If we didn't overshoot, continue as normal
cout <<
"\nBin Center: " << hist->GetBinCenter(i) <<
"\tPerc: " << perc <<
"\tTarget: " << target;
}
target += delta;
}
lastPerc = perc;
if((perc) == 1) { break; }
}
cout << endl;
}
/* This is for refmult
21,19,17,15,14,12,11,9
21+:11
19+:19
17+:29
15+:42
14+:49
12+:63
11+:69
9+:80
*/
/*
This is for number of tracks that pass cuts
75+:0-25
56+:0-50
41+:0-75
*/