可以实现矩阵的奇异值分解，当矩阵较大时分解速度较慢，仅供研究矩阵奇异值分解的同仁参考。-This program can realize the singular value decomposition of a rectangular matrix. When the matrix size is large, the decomposition speed is slow. This program is just a reference for those who are interested in singular value decomposition of a matrix.