为什么等同于matrice元素不能正常工作

Question

import numpy as np


alpha_p_array  = np.arange(0.01,0.1+0.01/2,0.01)
alpha_b_array = np.logspace(-2, 0, num=20)
zero_matrice = np.zeros((np.size(alpha_b_array),np.size(alpha_p_array)))
max_internal_biofuel = zero_matrice 
oscillation_internal_biofuel = zero_matrice 
final_external_biofuel = zero_matrice

i =  19                                                                                                    
j =  0

max_internal_biofuel[i,j] = 12
oscillation_internal_biofuel[i,j] = 11
final_external_biofuel[i,j] =  14

嘿，所以我有三个＆＃34; 20x10＆＃34;零矩阵，称为＆＃34; max_internal_biofuel＆＃34;，＆＃34; oscillation_internal_biofuel＆＃34;和＆＃34; final_external_biofuel＆＃34;。

我只是想知道为什么选择＆＃34; j th（19）＆＃34;行和＆＃34; i th（0）＆＃34;每个矩阵的列并赋予它们不同的值，元素而不是12,11,14都只是14。

对此的解决方案将不胜感激！谢谢！