Reading STL container in RDataFrame branch

[patrizioconsole]

I am happy to inform you that I have solved the issue.
The solution is here:

RDataFrame::Foreach with array branch

_ROOT Version:6.15 Hi all; if aTree with Branch array. TTree::Branch(“a”, “&a”, “a[30]/D”); RDataFrame aData("…","…"); aData.ForEach([](double * a){cout<<a<<endl;}, “a”) error Error in TTreeReaderValueBase::GetBranchDataType(): Must use TTreeReaderArray to read branch fptcl_r: it contains an array or a collection. Error in TTreeReaderValueBase::CreateProxy(): The template argument type T of double* accessing branch fptcl_r (which contains data of type (null)) is not known to ROOT. You …

Thank you anyway for your time