[英]Creating a pandas dataframe from a 2d numpy array (to be a column of 1d numpy arrays) and a 1d np array of labels
例如,我有這些 numpy 數組:
import pandas as pd
import numpy as np
# points could be in n dimension, i need a solution that would cover that up
# and being able to calculate distance between points so flattening the data
# is not my goal.
points = np.array([[1, 2], [2, 1], [100, 100], [-2, -1], [0, 0], [-1, -2]]) # a 2d numpy array containing points in space
labels = np.array([0, 1, 1, 1, 0, 0]) # the labels of the points (not necessarily only 0 and 1)
我試圖制作一本字典,並從中創建熊貓數據框:
my_dict = {'point': points, 'label': labels}
df = pd.DataFrame(my_dict, columns=['point', 'label'])
但它沒有用,我得到以下異常:
Exception: Data must be 1-dimensional
可能是因為點的 numpy 數組(二維 numpy 數組)。
想要的結果:
point label
0 [1, 2] 0
1 [2, 1] 1
2 [100, 100] 1
3 [-2, -1] 0
4 [0, 0] 0
5 [-1, -2] 1
在此先感謝所有幫助者:)
您應該始終嘗試規范化您的數據,以便每列只包含奇異值,而不是具有維度的數據。
在這種情況下,我會做這樣的事情:
>>> df = pd.DataFrame({'x': points[:,0], 'y': points[:, 1], 'label': labels},
columns=['x', 'y', 'label'])
>>> df
x y label
0 1 2 0
1 2 1 1
2 100 100 1
3 -2 -1 1
4 0 0 0
5 -1 -2 0
如果您真的堅持保留點,請在傳遞給pandas
之前將它們轉換為列表列表或元組列表以避免此錯誤。
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