python分别创建四阶零矩阵和四阶单位矩阵, 以及对角线元素分别为1,2,3,4 的 对角矩阵

# 四阶零矩阵
zero_matrix = [[0 for j in range(4)] for i in range(4)]
print(zero_matrix)

# 四阶单位矩阵
identity_matrix = [[0 for j in range(4)] for i in range(4)]
for i in range(4):
identity_matrix[i][i] = 1
print(identity_matrix)

# 对角线元素分别为1,2,3,4的对角矩阵
diagonal_matrix = [[0 for j in range(4)] for i in range(4)]
for i in range(4):
diagonal_matrix[i][i] = i + 1
print(diagonal_matrix)