此书讲解了嵌入式系统的开发及测试过程，对嵌入式系统的测试介绍得很详细，很有参考价值。-Many enterprises regard system-level testing as the final piece of the development effort, rather than as a tool that should be integrated throughout the development process. As a consequence, test teams oft

矩阵QR算法 能计算任何矩阵的Q和R，结果很精确，望大家修改使其精简点-Matrix QR algorithm can calculate any matrix Q and R, the results are accurate, we modify and adapt them to look to streamline the point