numpy.diag_indices_from

numpy.diag_indices_from(arr)

返回访问n维数组主对角线的索引.

有关完整详细信息,请参见 diag_indices .

参数:

arr数组,至少是2维

参见

diag_indices

示例

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>>> import numpy as np

创建一个4x4的数组.

>>> a = np.arange(16).reshape(4, 4)
>>> a
array([[ 0,  1,  2,  3],
       [ 4,  5,  6,  7],
       [ 8,  9, 10, 11],
       [12, 13, 14, 15]])

获取对角线元素的索引.

>>> di = np.diag_indices_from(a)
>>> di
(array([0, 1, 2, 3]), array([0, 1, 2, 3]))

>>> a[di]
array([ 0,  5, 10, 15])

这仅仅是diag_indices的语法糖.

>>> np.diag_indices(a.shape[0])
(array([0, 1, 2, 3]), array([0, 1, 2, 3]))

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