用vb实现最优化方法中的几种基本算法，包括最速下降法、牛顿法、共轭梯度法、最小二乘法等并结合数据库的使用，程序中还附带用户登录及管理-With vb achieve optimal methods of several basic algorithms, including the steepest descent method, Newton method, conjugate gradient method, least squares method and combined use of