Question #567

In Python, how to convert a Pandas Dataframe to NumPy array?

Answer

In Python, the best way to convert a Pandas Dataframe to a NumPy array is to use the method pandas.DataFrame.to_numpy() :

>>> import pandas as pd
>>> df = pd.DataFrame([[1, 2, 3], [4, 5, 6]])
>>> df.to_numpy()
array([[1, 2, 3],
       [4, 5, 6]])

By default, a view is returned: any modifications made will affect the original.

>>> array = df.to_numpy()
>>> array[0,0] = -1
>>> df
   	0	1	2 
0 	-1	2	3
1	4	5	6

To get a copy, use the copy=True option:

df.to_numpy(copy=True)

4 events in history
Answer by Alphonsio 12/31/2020 at 06:37:49 PM

In Python, the best way to convert a Pandas Dataframe to a NumPy array is to use the method pandas.DataFrame.to_numpy() :

>>> import pandas as pd
>>> df = pd.DataFrame([[1, 2, 3], [4, 5, 6]])
>>> df.to_numpy()
array([[1, 2, 3],
       [4, 5, 6]])

By default, a view is returned: any modifications made will affect the original.

>>> array = df.to_numpy()
>>> array[0,0] = -1
>>> df
   	0	1	2 
0 	-1	2	3
1	4	5	6

To get a copy, use the copy=True option:

df.to_numpy(copy=True)

Answer by Alphonsio 12/31/2020 at 06:18:37 PM

In Python, the best way to convert a Pandas Dataframe to a NumPy array is to use the method pandas.DataFrame.to_numpy() :

>>> import pandas as pd
>>> df = pd.DataFrame([[1, 2, 3], [4, 5, 6]])
>>> df.to_numpy()
array([[1, 2, 3],
       [4, 5, 6]])

By default, a view is returned: any modifications made will affect the original.

>>> array = df.to_numpy()
>>> array[0,0] = -1
>>> df
   	0	1	2 
0 	-1	2	3
1	4	5	6

To get a copy, use the copy=True option:

to_numpy(copy=True)

Answer by Alphonsio 12/31/2020 at 06:14:06 PM

In Python, the best way to convert a Pandas Dataframe to a NumPy array is to use the method pandas.DataFrame.to_numpy() :

>>> import pandas as pd
>>> df = pd.DataFrame([[1, 2, 3], [4, 5, 6]])
>>> df.to_numpy()
array([[1, 2, 3],
       [4, 5, 6]])

By default, a view is returned: any modifications made will affect the original.

>>> array = df.to_numpy()
>>> array[0,0] = -1
>>> df
   	0	1	2 
0 	-1	2	3
1	4	5	6

To get a copy, use the copy=True option:

to_numpy(copy=True)



Question by Alphonsio 12/31/2020 at 06:04:49 PM
In Python, how to convert a Pandas Dataframe to NumPy array?
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