加权最小二乘法状态估计算法程序，可以算不同数量的节点。限制小，程序结构简单，简单易懂，讲解详细。还可以根据需要对目标函数以及残差进行每次迭代的输出。-Weighted least squares state estimation algorithm, can be used for different number of buses. Restrict small, program structure is simple, easy to understand, explain in detail. Also according to the objective function and the output of each iteration residuals.