numpy更改矩陣對角線上元素的值

賦不同值

import numpy as np

data = score = np.array([[80, 89, 86, 67, 79],
[78, 97, 89, 67, 81],
[90, 94, 78, 67, 74],
[91, 91, 90, 67, 69],
[76, 87, 75, 67, 86]])

row, col = np.diag_indices_from(data)
data[row,col] = np.array([1, 2, 3, 4, 5])

print(data)

[[ 1 89 86 67 79]
 [78  2 89 67 81]
 [90 94  3 67 74]
 [91 91 90  4 69]
 [76 87 75 67  5]]

賦相同值

import numpy as np

data = score = np.array([[80, 89, 86, 67, 79],
[78, 97, 89, 67, 81],
[90, 94, 78, 67, 74],
[91, 91, 90, 67, 69],
[76, 87, 75, 67, 86]])

row, col = np.diag_indices_from(data)
data[row,col] = 100

print(data)

[[100  89  86  67  79]
 [ 78 100  89  67  81]
 [ 90  94 100  67  74]
 [ 91  91  90 100  69]
 [ 76  87  75  67 100]]