Convention for numbering bins in ROOT Histogram
For all histogram types: nbins, xlow, xup
bin = 0; underflow bin
bin = 1; first bin with low-edge xlow INCLUDED
bin = nbins; last bin with upper-edge xup EXCLUDED
bin = nbins+1; overflow bin
See
TH1 in detail.
1) nbins = 5, xlow = 0, xup = 5
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| 1 | 2 | 3 | 4 | 5 | 5 : nbins
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0 1 2 3 4 5
2) offset = -0.5, nbins = 5, xlow = offset, xup = 5+offset
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| 1 | 2 | 3 | 4 | 5 | 5 : nbins
---------------------
0 1 2 3 4 5
Posted by Jeong Han Lee
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