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[df] Doc fix: add required argument to Define #22772

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[df] Doc fix: add required argument to Define #22772

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2 changes: 1 addition & 1 deletion tree/dataframe/src/RDataFrame.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -522,7 +522,7 @@ For example, to fill a histogram with the "pt" of selected particles for each ev

~~~{.cpp}
// h is filled with all the elements of `good_pts`, for each event
auto h = df.Define("good_pts", [](const ROOT::RVecF &pt) { return pt[pt > 0]; })
auto h = df.Define("good_pts", [](const ROOT::RVecF &pt) { return pt[pt > 0]; }, {"pt"})
.Histo1D("good_pts");
~~~

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