Root macro to retrieve and copy in a csv file the number of photo-electrons from a root file

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Add a String Filter in Datafram

ROOT Version: 6.24/02 Platform: Scientific Linux 7.3 (Nitrogen) Compiler: gcc 4.8.5(Red Hat 4.8.5-28) I am using RDataFrame to analyze some data in a root file, which involves the filtering of string data. i.e. auto Si = d.Filter("ParticleName == \"proton\"").Histo1D({"Si","Si",4000,0,400},"particleEnergy"); That is to filter out the energy of protons. However, there is a problem with the above filter statement, and the error is as follows: /opt/root62402/include/ROOT/RVec.hxx:609:23: er…