is it possibile to have the “report” function output that takes into account weighted events instead of only events (== number of entries that survive a certain selection cut)?
_ROOT Version: 6.12
Compiler: Not Provided
unfortunately this is not possible: Report “counts” entries which are passing a certain sequence of filters. Perhaps you can solve your case “accumulating the weights” with an action hanging from the last of the filters in the chain?
I’m sorry but I’ve not understood what you suggest.
Is it a possible to ask you a small example of what you mean ?
Also because one of the best feature of the TDataFrame is the multithread option and summing a variable is not always “thread safe”.
the method I am suggesting to use is Sum. This method returns a ResultPtr to the sum of the elements in the column specified:
auto mySum = tdf.Filter(myfilter, mycolumns).Sum("myweights");
std::cout << mySum.GetValue() << std::endl;
And, most importantly, all actions performed by TDF are thread-safe (unless thread unsafe lambdas are injected by the user in the graph).
Thank you !!! I’ve just modified my program and it works properly !
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