利用割线法、进退法、黄金分割法等求解给定区间内的极大值与极小值-Using the secant method, advance and retreat, such as golden section method for solving the given interval maxima and minima

最优化问题中的最速下降法，共轭梯度法，黄金分割法代码，为applied optimization with matlab programming书中源代码-Steepest descent method, conjugate gradient method, golden section method code