Projection in THnSparse

[Wile_E_Coyote]

Some time ago, I wrote various source code (which deals with a creation of a 3D THnSparse and then its 1D and 2D projections) for someone else which you can reuse:

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

Maybe this works: #include "TH1.h" #include "TH2.h" #include "THnSparse.h" #include "TAxis.h" #include "TString.h" // Usage example: TH1D *h1 = Project1D(his3D, 449.5, 452.5, 668.5, 671.5); // Note: in principle, you should set low1 <= up1 and low2 <= up2 TH1D *Project1D(THnSparse *h, // the ("totally unsymmetric") "cubic" histogram Double_t low1, Double_t up1, // the first "window" Double_t low2, Double_t up2, // the second "window" Option_t *op…