sumt法，具有二次收敛性，若目标函数为二次正定函数，经有限步可达到极小点-sumt method, with quadratic convergence, if the objective function is quadratic positive definite function can be achieved by the finite step minima

matlab的sumt算法，效果很好，大家可以参考。(SUMT algorithm of MATLAB, the effect is very good, you can refer to.)