说明：  LU分解的程序实现，要求如下： 1）不限编程语言，程序为可执行文件，例如 .m文件等，不能是word或者txt文档； 2）程序可以实现任意矩阵的LU分解，并附上简单实例； 3）同时提交程序的说明文档，对程序简单说明；
(The implementation of the LU decomposition program is required as follows: 1) unlimited programming language, programs for executable files, such as.M files, etc., can not be word or TXT documents; 2) the program can realize the LU decomposition of any matrix, and a simple example is attached. 3) submitting the instructions of the program at the same time, and simply explaining the program;)