a和b以查找相同的值，然后我想将它们附加到一个新数组difference，但是我收到错误：ValueError: all the input array dimensions for the concatenation axis must match exactly, but along dimension 1, the array at index 0 has size 0 and the array at index 1 has size 2。我如何能够修复此问题？
import numpy as np
a = np.array([[0,12],[1,40],[0,55],[1,23],[0,123.5],[1,4]])
b = np.array([[0,3],[1,10],[0,55],[1,34],[1,122],[0,123]])
difference= np.array([[]])
for i in a:
for j in b:
if np.allclose(i, j, atol=0.5):
difference = np.concatenate((difference,[i]))
预期输出：
[[ 0. 55.],[ 0. 123.5]]
In [22]: a = np.array([[0,12],[1,40],[0,55],[1,23],[0,123.5],[1,4]])
...: b = np.array([[0,3],[1,10],[0,55],[1,34],[1,122],[0,123]])
使用直截了当的列表理解：
In [23]: [i for i in a for j in b if np.allclose(i,j,atol=0.5)]
Out[23]: [array([ 0., 55.]), array([ 0. , 123.5])]
但至于你方的连结。查看数组的形状：
In [24]: np.array([[]]).shape
Out[24]: (1, 0)
In [25]: np.array([i]).shape
Out[25]: (1, 1)
concatenate。
In [26]: difference= np.array([[]])
...: for i in a:
...: for j in b:
...: if np.allclose(i, j, atol=0.5):
...: difference = np.concatenate((difference,[i]), axis=1)
...:
In [27]: difference
Out[27]: array([[ 0. , 55. , 0. , 123.5]])
全数组方法：
Broadcasea对b，生成(5，5，2)接近数组：
In [37]: np.isclose(a[:,None,:],b[None,:,:], atol=0.5)
Out[37]:
array([[[ True, False],
[False, False],
[ True, False],
[False, False],
[False, False],
[ True, False]],
[[False, False],
[ True, False],
[False, False],
[ True, False],
[ True, False],
[False, False]],
[[ True, False],
[False, False],
[ True, True],
[False, False],
[False, False],
[ True, False]],
[[False, False],
[ True, False],
[False, False],
[ True, False],
[ True, False],
[False, False]],
[[ True, False],
[False, False],
[ True, False],
[False, False],
[False, False],
[ True, True]],
[[False, False],
[ True, False],
[False, False],
[ True, False],
[ True, False],
[False, False]]])
查找两列均为TRUE的位置，以及至少有一行&Quot；为：
的位置In [38]: _.all(axis=2)
Out[38]:
array([[False, False, False, False, False, False],
[False, False, False, False, False, False],
[False, False, True, False, False, False],
[False, False, False, False, False, False],
[False, False, False, False, False, True],
[False, False, False, False, False, False]])
In [39]: _.any(axis=1)
Out[39]: array([False, False, True, False, True, False])
In [40]: a[_]
Out[40]:
array([[ 0. , 55. ],
[ 0. , 123.5]])
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