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我想幾個numpy的條件相結合,並如預期其不添加:組合的條件:numpy的陣列
import numpy as np
ke, ku = np.arange(30, dtype=int), np.arange(50, dtype=int)
KE, KU = np.meshgrid(ke, ku, indexing='ij')
現在,預期以下工作:
>>> (KU > 0)[:5, :5]
Out[28]:
array([[False, True, True, True, True],
[False, True, True, True, True],
[False, True, True, True, True],
[False, True, True, True, True],
[False, True, True, True, True]], dtype=bool)
>>> (KE > 0)[:5, :5]
Out[29]:
array([[False, False, False, False, False],
[ True, True, True, True, True],
[ True, True, True, True, True],
[ True, True, True, True, True],
[ True, True, True, True, True]], dtype=bool)
>>> ((KE > 0) & (KU > 0))[:5, :5]
Out[31]:
array([[False, False, False, False, False],
[False, True, True, True, True],
[False, True, True, True, True],
[False, True, True, True, True],
[False, True, True, True, True]], dtype=bool)
然而,在下一個案例,並不是很多:
>>> (KE + KU > 1)[:5, :5]
Out[24]:
array([[False, False, True, True, True],
[False, True, True, True, True],
[ True, True, True, True, True],
[ True, True, True, True, True],
[ True, True, True, True, True]], dtype=bool)
>>> ((KE + KU > 1) & KE > 0)[:5, :5]
Out[19]:
array([[False, False, False, False, False],
[False, True, True, True, True],
[False, False, False, False, False],
[ True, True, True, True, True],
[False, False, False, False, False]], dtype=bool)
我預計以下結果 - 爲什麼沒有發生?
array([[False, False, False, False, False],
[False, True, True, True, True],
[ True, True, True, True, True],
[ True, True, True, True, True],
[ True, True, True, True, True]], dtype=bool)