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DOC: add demo of factorize #5731

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Dec 18, 2013
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DOC: add demo of factorize #5731

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22 changes: 22 additions & 0 deletions doc/source/reshaping.rst
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Expand Up @@ -417,3 +417,25 @@ This function is often used along with discretization functions like ``cut``:


get_dummies(cut(values, bins))

Factorizing values
------------------

To encode 1-d values as an enumerated type use ``factorize``:

.. ipython:: python

x = pd.Series(['A', 'A', np.nan, 'B', 3.14, np.inf])
x
labels, uniques = pd.factorize(x)
labels
uniques

Note that ``factorize`` is similar to ``numpy.unique``, but differs in its
handling of NaN:

.. ipython:: python

pd.factorize(x, sort=True)
np.unique(x, return_inverse=True)[::-1]