Python 获取高数组的对角索引

我有一个大小为5 x 3 x 3的数组。
我想用数字填充每个3 x 3块的对角线。
如何使用numpy（一个python库）高效地实现这一点

我的出发点是：

[[[0 0 0]
  [0 0 0]
  [0 0 0]]

 [[0 0 0]
  [0 0 0]
  [0 0 0]]

 [[0 0 0]
  [0 0 0]
  [0 0 0]]

 [[0 0 0]
  [0 0 0]
  [0 0 0]]

 [[0 0 0]
  [0 0 0]
  [0 0 0]]]

我想要这样的东西：

[[[0.07735655 0         0        ]
  [0         0.11476396 0        ]
  [0         0         0.09903619]]

 [[0.1923885  0         0        ]
  [0         0.03063454 0        ]
  [0         0         0.06028193]]

 [[0.06566275 0         0        ]
  [0         0.03151423 0        ]
  [0         0         0.04042383]]

 [[0.07950743 0         0        ]
  [0         0.03250461 0        ]
  [0         0         0.0448308 ]]

 [[0.10879917 0         0        ]
  [0         0.04700161 0        ]
  [0         0         0.03924387]]]

您可以使用以下选项：

diag_ind_y, diag_ind_x = np.diag_indices(3)
arr1[:, diag_ind_y, diag_ind_x] = diag_vals

测试它：

import numpy as np

arr1 = np.zeros(shape=(5,3,3), dtype=np.float64)   # Your array
diag_vals = np.random.rand(5,3)                    # The source of your diag values
diag_ind_y, diag_ind_x = np.diag_indices(3)        # Returns arrays [0,1,2] and [0,1,2]
arr1[:, diag_ind_y, diag_ind_x] = diag_vals
print (arr1)

[[[0.69514006 0.         0.        ]
  [0.         0.4014048  0.        ]
  [0.         0.         0.473671  ]]

 [[0.12769874 0.         0.        ]
  [0.         0.8565723  0.        ]
  [0.         0.         0.69453857]]

 [[0.00943213 0.         0.        ]
  [0.         0.81497541 0.        ]
  [0.         0.         0.6915095 ]]

 [[0.33894452 0.         0.        ]
  [0.         0.24649647 0.        ]
  [0.         0.         0.61987433]]

 [[0.30184036 0.         0.        ]
  [0.         0.66978532 0.        ]
  [0.         0.         0.34574364]]]

输出：

import numpy as np

arr1 = np.zeros(shape=(5,3,3), dtype=np.float64)   # Your array
diag_vals = np.random.rand(5,3)                    # The source of your diag values
diag_ind_y, diag_ind_x = np.diag_indices(3)        # Returns arrays [0,1,2] and [0,1,2]
arr1[:, diag_ind_y, diag_ind_x] = diag_vals
print (arr1)

[[[0.69514006 0.         0.        ]
  [0.         0.4014048  0.        ]
  [0.         0.         0.473671  ]]

 [[0.12769874 0.         0.        ]
  [0.         0.8565723  0.        ]
  [0.         0.         0.69453857]]

 [[0.00943213 0.         0.        ]
  [0.         0.81497541 0.        ]
  [0.         0.         0.6915095 ]]

 [[0.33894452 0.         0.        ]
  [0.         0.24649647 0.        ]
  [0.         0.         0.61987433]]

 [[0.30184036 0.         0.        ]
  [0.         0.66978532 0.        ]
  [0.         0.         0.34574364]]]

---

将

循环与一起使用如何

这些数字进入对角线的来源是什么？随机数？或者其他数组——如果是，是什么形状？它是一个大小等于第一维度（5）*最后维度（3）的数组。i、 e:5 x 3