[Numpy-discussion] Numpy Enhancement Proposal: group_by functionality

[Alan G Isaac]

My comment is just on the name.
I'd expect something named `groupby`
to behave essentially like Mathematica's `GatherBy` command.
http://reference.wolfram.com/mathematica/ref/GatherBy.html

I think you are after something more like Matlab's grpstats:
http://www.mathworks.com/help/stats/grpstats.html

Perhaps the implicit reference to SQL justifies the name...

Sorry if this seems off topic,
Alan Isaac