Help on Method/s to create Tree from multi-fold gamma-ray coincidence data

ROOT
51

For “METHOD1” and “METHOD2” you should use:

TFile *f = TFile::Open("cub_his3D.root");
TH3 *his3D; f->GetObject("his3D", his3D);

For “METHOD3” and “METHOD4” you should use:

TFile *f = TFile::Open("cub_sparse.root");
THnSparse *his3D; f->GetObject("his3D", his3D);

I’m not sure if the “number of entries” is what you want. I guess you’d better try with the TH1::Integral method.

Note also that, in any operations, entire bins are always taken into account so, if you want to compare numbers, you need to make sure that e.g. zaxis->GetBinLowEdge(zaxis->FindFixBin( zmin )) and zaxis->GetBinUpEdge(zaxis->FindFixBin( zmax )) (and so on) are equal for all histograms that you want to compare (btw. following the standard convention for numbering bins, the low-edge is included but the upper-edge is excluded).

Please compare input parameters of the TAxis::SetRange, the TAxis::SetRangeUser and the TH1::SetAxisRange methods.