波形峰谷处画平行于Y轴的直线

x = 0:0.1:2*pi;   %x的取值生成 y = sin(x);   %y=sin(x)函数 [a,b] = findpeaks(y); y1 = -y; [a1,b1] = findpeaks(y1); plot(x,y);  %绘制图形 ylim=get(gca,'Ylim'); % 获取当前图形的纵轴的范围 hold on plot([b*0.1,b*0.1],ylim,'m--'

>>阅读原文<<