Python array in TH2 construction

ROOT
1

Dear experts,

I got an error when using Python array in TH2 construction. Could you please help me?

import ROOT
import array
my_array = array.array('f', [0,1,2])
test_th1 = ROOT.TH1F("","",2,my_array) #this works
test_th2 = ROOT.TH2F("","",2,my_array,2,my_array) #also works
test2_th2 = ROOT.TH2F("","",2,my_array,2,0,2) #doesn't work

The error message is

TH2F::TH2F(const char* name, const char* title, int nbinsx, const double* xbins, int nbinsy, double ylow, double yup) =>
    could not convert argument 4

Thank you and looking forward to your reply

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ROOT Version: 6.12/07
Platform: SLF 7.8 (Nitrogen)
Compiler: Not Provided

2

Hello,

The overload expects a const double*, so you need to create an array of doubles my_array = array.array('d', [0,1,2]).

4

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