获取索引行的子数组列的总和

def get_subarray_column_sum(matrix, index_row):
    column_sum = 0
    for col in range(len(matrix[0])):
        for row in range(index_row, len(matrix)):
            column_sum += matrix[row][col]
    return column_sum

# 示例二维数组
matrix = [[1, 2, 3],
          [4, 5, 6],
          [7, 8, 9]]

# 示例索引行
index_row = 1

# 调用函数计算子数组列的总和
result = get_subarray_column_sum(matrix, index_row)
print(result)  # 输出：27