gusucode.com > 《遗传算法工具箱及应用》的源代码 > 《遗传算法工具箱及应用》的源代码/gatbx/gatbx-example/gatbx/gaplotchange.m
function state = gaplotchange(options, state, flag) % GAPLOTCHANGE Plots the logarithmic change in the best score from the % previous generation.绘图函数gaplotchange画出前一代个体最佳值变化的图形 % persistent last_best % Best score in the previous generation 前一代个体的最佳值 if(strcmp(flag,'init')) % Set up the plot 开始绘图 set(gca,'xlim',[1,options.Generations],'Yscale','log'); hold on; xlabel Generation title('Change in Best Fitness Value') end best = min(state.Score); % Best score in the current generation 当前代个体的最佳值 if state.Generation == 0 % Set last_best to best. 设置last_best为最佳 last_best = best; else change = last_best - best; % Change in best score 个体最佳值的改变 last_best=best; plot(state.Generation, change, '.r'); title(['Change in Best Fitness Value']) end