遗传算法，说明: fga.m 为遗传算法的主程序 采用二进制Gray编码,采用基于轮盘赌法的非线性排名选择, 均匀交叉,变异操作,而且还引入了倒位操作!-Genetic algorithms described: fga.m main genetic algorithms　binary Gray code, roulette method based on nonlinear ranking selection, uniform crossover, mutation, but also introduces the inversion operation!