Binning of histograms and accessing spectrum manipulation functions

[dastudillo]

Numpy arrays in variable binned histogram with pyroot

Hello, I am using root-6.08.02 to make a variable binned histogram with PyROOT. I find that this works: from array import array m = [400,450,500,550,600,650,700,750,800,850,900,950,1000,1150,1500] h = ROOT.TH1D("h",";m [GeV];Events/ 50 GeV;;",len(m)-1,array('d',m)) but this doesn’t import numpy as np m = [400,450,500,550,600,650,700,750,800,850,900,950,1000,1150,1500] h = ROOT.TH1D("h",";m [GeV];Events/ 50 GeV;;",len(m)-1,np.asarray(m)) I error I get is Error in < TGaxis::PaintAxis >: len…

Problem constructing TH2F

(Number of bins = array_dimension) gives: root [0] Double_t b_f[9]={0.,0.1,0.16,0.2,0.25,0.3,0.35,0.4,0.6}; root [1] TH2F*h=new TH2F("a","a",10,0,1,9,b_f) Error in <TAxis::TAxis::Set>: bins must be in increasing order root [2] (Number of bins = array_dimension-1) gives: root [0] Double_t b_f[9]={0.,0.1,0.16,0.2,0.25,0.3,0.35,0.4,0.6}; root [1] TH2F*h=new TH2F("a","a",10,0,1,8,b_f) root [2] That’s logic, the array defines the bins’ boundaries.