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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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Update groupby.rst
mazieres Feb 8, 2014
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mazieres Feb 8, 2014
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27 changes: 26 additions & 1 deletion doc/source/groupby.rst
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Expand Up @@ -722,4 +722,29 @@ 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::

In [2]: dat = {'a':[1,0,0], 'b':[0,1,0], 'c':[1,0,0], 'd':[2,3,4]}
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this needs to be actual code, not a past of an ipython session (it WILL generate an ipython session as it goes)

e.g.

 df = DataFrame(.....)
df.groupby(df.sum(), axis=1).sum()

is all that's needed

and needs to be

.. ipython:: python


In [3]: df = pd.DataFrame(dat)

In [4]: df
Out[4]:
a b c d
0 1 0 1 2
1 0 1 0 3
2 0 0 0 4

In [5]: df.groupby(df.sum(), axis=1).sum()
Out[5]:
1 9
0 2 2
1 1 3
2 0 4