Home | News | Documentation | Download

Question on vector<vector<int>> using RDataFrame


Please read tips for efficient and successful posting and posting code

ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided


CentOS Linux release 7.9.2009 (Core)q
/cvmfs/sft.cern.ch/lcg/releases/LCG_97a/ROOT/v6.20.06/x86_64-centos7-gcc8-opt/bin/root

i am trying to read a root tuple created by someone else. the leaves are mostly vector<vector >.
when i create and rdf and use GetColumnType it returns ROOT::VecOps::RVec<vector>, which
is sensible. i read in another posting one needs to create a ROOT.gInterpreter.Declare in order to
loop over the vector. i am not exactly sure how to do that. my attempt is
ROOT.gInterpreter.Declare("""
int break_vector_vector(const ROOT::RVec<vector>& var1) {
std::cout << var1.size() << std::endl;
for (std::size_t i=0; i<var1.size(); i++) {
for (std::size_t j=0; j<var1[i].size(); j++) {
std::cout << i << " " << j << std::endl;
}
}
return 0;
};
“”")

an unrelated question is the cout’s done seem to execute within the gInterpreter in rdataframe python.
is there a trick to using this? thanks in advance. …kj

Hi @kjohns; I am sure @eguiraud can help you with this.

Cheers,
J.

Hi @kjohns,
you are using Python, not C++, correct?

What does not work exactly? The function definition seems ok at first glance. Can you post a self-contained snippet that shows the problem (with full error message)?

Cheers,
Enrico

8 posts were split to a new topic: Snapshot of RVec<RVec> produces broken ROOT file

Move the conversation with @clementhelsens to another topic. @kjohns let us know if you are still having issues.