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get_dummies with NaN #4446

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hayd opened this issue Aug 2, 2013 · 1 comment · Fixed by #4458

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@hayd
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commented Aug 2, 2013

get_dummies seems to get caught out by NaNs

In [11]: s1 = pd.Series(['a', 'a', np.nan, 'c', 'c', 'c'])

In [12]: s1
Out[12]: 
0      a
1      a
2    NaN
3      c
4      c
5      c
dtype: object

In [13]: pd.get_dummies(s1)
Out[13]: 
   a  c
0  1  0
1  1  0
2  0  1
3  0  1
4  0  1
5  0  1

A rogue c has been used as the NaN value, I think expected is:

In [14]: pd.get_dummies(s1[s1.notnull()])
Out[14]: 
   a  c
0  1  0
1  1  0
3  0  1
4  0  1
5  0  1
@hayd

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commented Aug 3, 2013

fix for this on the way (cat.labels == -1 for NaN was the issue).

This was referenced Aug 4, 2013

@hayd hayd closed this in #4458 Aug 26, 2013

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