Subtraction two histograms with differents entries in Pyroot

ROOT
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Hello everyone
In advance thank you very much for the help.

I’m just learning about pyroot and now I have a difficulty because I have to subtract two histograms with pyroot but the number of entries is different in each one, but I can’t find on the internet examples of how to do it in pyroot when there are different inputs.

Thank you again.

Carlos

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The answer to this depends on what you mean by different number of entries. Strictly speaking, a different number of entries in a histogram (number of times you called Fill on the histogram) doesn’t prevent you from subtracting one from another. However, a different binning (number of bins, or lower/upper edges of bins) will stop you, and there are workarounds like re-binning, to reach a common number, in some cases.

So giving some more info will let someone help you with your specific case:

print(histo1.GetXaxis().GetNbins(), histo2.GetXaxis().GetNbins())
print(histo1.GetXaxis().GetBinLowEdge(1), histo2.GetXaxis().GetBinLowEdge(1))
print(histo1.GetXaxis().GetBinUpEdge(histo1.GetXaxis().GetNbins()), histo2.GetXaxis().GetBinUpEdge(histo2.GetXaxis().GetNbins()))
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