说明：  这是一个用C++编写的矩阵类，含测试代码，供大家研究使用。实现了矩阵的创建、初始化、拷贝、赋值、乘法、加法、转置、求秩等运算，并给出了利用高斯消去法进行求逆、解线性方程组等功能。也可再次扩展。
(Self defined C++ matrix class for everyone to use. To achieve the creation of the matrix, initialize, copy, assignment, multiplication, addition, transpose, rank and other operations, and gives the advantage of inverse Gaussian elimination method, solving linear equations and other functions. Can also be extended on the basis of their own needs.)