I ran into a problem with TTree::Draw() and TH1F.
I got two different mean when using TTree::Draw() and TH1F
The code is following:
for (int j = 0; j < tree->GetEntries(); j++)
I wonder what’s the difference between them, thank you all.
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Make sure you use something like this:
int nbins = 100; // set a reasonable value
double xmin = 0., xmax = 100.; // set reasonable values
gROOT->cd(); // newly created histograms should go here
TH1F *hist1 = new TH1F("hist1", "my hist 1;my x;my y", nbins, xmin, xmax);
TH1F *hist2 = new TH1F("hist2", "my hist 2;my x;my y", nbins, xmin, xmax);
Yes，I created the hist just like you did.
TH1F* hist1=new TH1F("hist1","", 100, 0, 100);
TH1F* hist2=new TH1F("hist2","", 100, 0, 100);
Hi @YULianzhou ,
could this be a precision issue in
TH1F? Do you still see the problem if you switch to
TH1D (with double precision bins)?