[help] Get sub DataFrame by column_name for Groupby

hosseinmoein / DataFrame

C++ DataFrame for statistical, Financial, and ML analysis -- in modern C++ using native types and contiguous memory storage

https://hosseinmoein.github.io/DataFrame/

BSD 3-Clause "New" or "Revised" License

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Closed westfly closed 3 years ago

westfly commented 3 years ago

We have a big DataFrame, but only care a few column for groupby which may cost time，so we generate sub DataFrame to groupby.

we check api, get_data_by_idx get_data_by_loc will work，but we must keep idx of column outside. Is it possible to add interface by column_names ?

hosseinmoein commented 3 years ago

I am not sure I understand what you are asking. Can you explain further, ideally with an example?