What does groupbyx create?

[mo-joshuacolclough]

I see in the documentation that the groupbyx function returns a DataFrame object.
Is this a "view" of the original DataFrame? Or is this a separate, new copy containing only the grouped items. I.e, if I was to group elements in a first DataFrame, and edit the resulting second DataFrame, would making changes in second also make changes in the first DataFrame?

As a seperate but somewhat related question, if I am to then use get_column on this second DataFrame, is it a reference to a vector of values? Or a reference to a vector of pointers? I'm looking at operating on these objects in Fotran (via reference) - it's important to know that it's changing the original data. Thanks!

[hosseinmoein]

All groupby's return a seperate brand new DataFrame. That should be evident from the documentation.
When you call get_column on a DataFrame (as opposed to a view) you get a reference to a vector of values.

[mo-joshuacolclough]

OK great, thanks