Hi! I am trying to convert a pandas dataframe to a RDataframe to save it as .root file. I have seen previous posts like As I have seen before, I convert the pandas df into a dictionary and then build the RDataframe. My problem is that one of my columns “detector” has string entries, which leads t…

Dear Viktoria, Thanks for the interesting post! I am doing some guessing about the context without the original input to reproduce your issue, but I suspect the issue here is linked to the conversion of the TPyResult returned by TPython::Eval to string. The Define line should look like: rdf = rd…

Dear Danilo, Thank you! The line you suggested runs without errors, but when I try to do rdf.Display().Print() I get loads of errors: logic_error: ROOT::RDF::RDisplay& ROOT::RDF::RResultPtr<ROOT::RDF::RDisplay>::operator*() => logic_error: basic_string::_M_construct null not valid input_line_…

Hi Viktoria, Sorry about that. Could you put me in condition to reproduce your setup with the input file you are using and a minimal form of the code that reproduce the error? That would be very useful to converge on a solution. Cheers, D

Hi, here is a minimal example with a small fraction of my data: min_example_string_dataframe.zip (3.5 KB) In case this would change anything, my root was installed with conda: root 6.28.0 py310h9b08913_1 conda-forge root_base 6.28.0 py310…

Dear Viktoria, Thanks for the reproducer and your patience. This example exposed a problem in ROOT, more specifically in its interaction with Python. What is happening is that the dictionary you are consulting inside the TPython::Eval invocation cannot be found. We are working on a better interope…

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