获取数组组合而无需自我重复

如何解决获取数组组合而无需自我重复

我有以下形状 points 的数组 (3,3)，它们是 3D 点

[[-0.20592405  0.33034652  1.0430001 ]
 [-0.23757319  0.29612657  1.03800011]
 [-0.304515    0.34571081  1.20400012]]

我需要找到这三个点的所有组合。我正在执行以下操作：

comb = np.array(list(itertools.product(points.tolist(),repeat=3)))

我明白了

[[[-0.20592405  0.33034652  1.0430001 ]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.23757319  0.29612657  1.03800011]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.23757319  0.29612657  1.03800011]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.23757319  0.29612657  1.03800011]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.304515    0.34571081  1.20400012]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.304515    0.34571081  1.20400012]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.20592405  0.33034652  1.0430001 ]
  [-0.304515    0.34571081  1.20400012]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.23757319  0.29612657  1.03800011]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.23757319  0.29612657  1.03800011]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.23757319  0.29612657  1.03800011]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.304515    0.34571081  1.20400012]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.304515    0.34571081  1.20400012]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.23757319  0.29612657  1.03800011]
  [-0.304515    0.34571081  1.20400012]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.20592405  0.33034652  1.0430001 ]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.23757319  0.29612657  1.03800011]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.23757319  0.29612657  1.03800011]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.23757319  0.29612657  1.03800011]
  [-0.304515    0.34571081  1.20400012]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.304515    0.34571081  1.20400012]
  [-0.20592405  0.33034652  1.0430001 ]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.304515    0.34571081  1.20400012]
  [-0.23757319  0.29612657  1.03800011]]

 [[-0.304515    0.34571081  1.20400012]
  [-0.304515    0.34571081  1.20400012]
  [-0.304515    0.34571081  1.20400012]]]

这给了我所有的组合，但我想丢弃重复的组合。因此，假设对于 3D 点 a、b、c，我得到了 [[a,a,a],[a,b],..,b,c],[c,c,c]] 的组合。我只想保留具有所有不同点的组合，即 [a,c]、[b,a] 等

解决方法

使用 itertools.combinations，只有一个：

l1=[[-0.20592405,0.33034652,1.0430001 ],[-0.23757319,0.29612657,1.03800011],[-0.304515,0.34571081,1.20400012]]
comb = np.array(list(itertools.combinations(l1,3)))
#array([[[-0.20592405,#        [-0.23757319,#        [-0.304515,1.20400012]]])

使用itertools.permutations：

comb = np.array(list(itertools.permutations(l1,3)))

comb 的值：

array([[[-0.20592405,1.20400012]],[[-0.20592405,1.20400012],1.03800011]],[[-0.23757319,[-0.20592405,1.0430001 ]],[[-0.304515,1.0430001 ]]])