Package

py-numpy-groupies

Description

This package consists of a couple of optimised tools for doing things
that can roughly be considered "group-indexing operations". The most
prominent tool is `aggregate`. `aggregate` takes an array of values, and
an array giving the group number for each of those values. It then
returns the sum (or mean, or std, or any, ...etc.) of the values in each
group. You have probably come across this idea before, using `matlab`
accumarray, `pandas` groupby, or generally MapReduce algorithms and
histograms. There are different implementations of `aggregate` provided,
based on plain `numpy`, `numba` and `weave`. Performance is a main
concern, and so far we comfortably beat similar implementations in other
packages (check the benchmarks).

Note