将一个矩阵添加到另一个更大矩阵的特定区域

# 定义原始矩阵A和目标矩阵B
matrix_A = [[1, 2], [3, 4]]
matrix_B = [[5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16], [17, 18, 19, 20]]

# 定义原始矩阵A要添加到目标矩阵B的起始位置和终止位置
start_row = 1
start_col = 1
end_row = start_row + len(matrix_A)
end_col = start_col + len(matrix_A[0])

# 确保目标矩阵B的大小足够容纳原始矩阵A要添加的特定区域
if len(matrix_B) < end_row or len(matrix_B[0]) < end_col:
    # 扩展目标矩阵B的大小
    new_row = max(end_row, len(matrix_B))
    new_col = max(end_col, len(matrix_B[0]))
    matrix_B = [[0] * new_col for _ in range(new_row)]

# 将原始矩阵A的特定区域的元素复制到目标矩阵B的对应位置上
for i in range(len(matrix_A)):
    for j in range(len(matrix_A[0])):
        matrix_B[start_row + i][start_col + j] = matrix_A[i][j]

# 输出添加矩阵后的结果
for row in matrix_B:
    print(row)

[5, 6, 7, 8]
[9, 1, 2, 12]
[13, 3, 4, 16]
[17, 18, 19, 20]