中文说明：
解决了最小无约束优化问题，步长由ARmijo非精确一维搜索生成，迭代方向分别由最速下降法，阻尼牛顿法，共轭梯度法，拟牛顿法(BFGS)产生。
English Description：
The minimum unconstrained optimization problem is solved. The step size is generated by Armijo inexact one-dimensional search, and the iterative direction is generated by steepest descent method, damped Newton method, conjugate gradient method and quasi Newton method (BFGS)