Get_dummies(), Exception: Data Must Be 1-dimensional
I have this data I am trying to apply this: one_hot = pd.get_dummies(df) But I get this error: Here is my code up until then: # Import modules import pandas as pd import numpy a
Solution 1:
IMO, the documentation should be updated, because it says pd.get_dummies
accepts data that is array-like, and a 2-D numpy
array is array like (despite the fact that there is no formal definition of array-like). However, it seems to not like multi-dimensional arrays.
Take this tiny example:
>>> df
ab c
0a1 d
1b2 e
2 c 3 f
You can't get dummies on the underlying 2D numpy
array:
>>>pd.get_dummies(df.values)
Exception: Data must be 1-dimensional
But you can get dummies on the dataframe itself:
>>>pd.get_dummies(df)
b a_a a_b a_c c_d c_e c_f
0 1 1 0 0 1 0 0
1 2 0 1 0 0 1 0
2 3 0 0 1 0 0 1
Or on the 1D array underlying an individual column:
>>> pd.get_dummies(df['a'].values)
ab c
010010102001
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