问题
I have a DataFrame with shape: 720*720 2D. I wanna convert it to 1D dimension without changing its values. How can I do this using Pandas?
回答1:
Use numpy.ravel with converted DataFrame to numpy array:
np.random.seed(123)
df = pd.DataFrame(np.random.randint(10, size=(3,3)))
print (df)
0 1 2
0 2 2 6
1 1 3 9
2 6 1 0
out = df.values.ravel('F')
#alternative for pandas 0.24+
#out = df.to_numpy().ravel('F')
print (out)
[2 1 6 2 3 1 6 9 0]
s = pd.Series(df.values.ravel('F'))
#alternative for pandas 0.24+
#s = pd.Series(df.to_numpy().ravel('F'))
print (s)
0 2
1 1
2 6
3 2
4 3
5 1
6 6
7 9
8 0
dtype: int32
来源：https://stackoverflow.com/questions/55062213/reshape-a-pandas-dataframe-of-720-720-into-518400-2d-into-1d