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Feb 15, 2014
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Add example section to groupby.rst and one example #6304

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mazieres Feb 8, 2014
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12 changes: 11 additions & 1 deletion doc/source/groupby.rst
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Expand Up @@ -722,4 +722,14 @@ To see the order in which each row appears within its group, use the

df.groupby('A').cumcount()

df.groupby('A').cumcount(ascending=False) # kwarg only
df.groupby('A').cumcount(ascending=False) # kwarg only

Examples
~~~~~~~~

Regroup columns of a DataFrame according to their sum, and sum the aggregated ones.

.. ipython:: python

df = pd.DataFrame({'a':[1,0,0], 'b':[0,1,0], 'c':[1,0,0], 'd':[2,3,4]})
df.groupby(df.sum(), axis=1).sum()