一维Newton的方法可以推广到多维的情况，这个方法也是求解无约束极值问题最古老的算法之一

已经发展成为一类算法：Newton形法-One-dimensional Newton' s method can be extended to the case of multi-dimensional, this method is also one of the oldest unconstrained algorithm extremal problem has developed into a class of algorithms: Newton form method