Doubts on TProfile Class Reference

I am referring to the references in ROOT: TProfile Class Reference
so what the w in the formula stands for ?
is it the bin content at a particular bin of y ?

You mean the option W ?

if option “W” is specified the bin content of the projected histogram is set to the product of the bin content of the profile and the entries. With this option the returned histogram will be equivalent to the one obtained by filling directly a TH1D using the 2-nd value as a weight. This makes sense only for profile filled with weights =1. If not, the error of the projected histogram obtained with this option will not be correct.*

sorry not this one. I mean the w appears in the sum…

W = weight . @moneta can gives more details if the doc is not clear enough

sure. please…


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