列主元消去法，LU分解,及最小二乘法的matlab- main Gauss method, LU triangular decomposition, Romberg (Romberg) algorithm, least square method Matlab procedures and operation results

列主元高斯消去法的实现，用于3阶增广矩阵求解，可自行修改到多阶-Out PCA Gaussian Elimination implementation for solving the augmented matrix of order 3, you can modify to multi-stage