Question

怎么用matlab画出这样的图？

怎么加上那些色块？要用什么函数实现呢？

Answer 1

Freq = 0:0.1:30;
Pow = sin(0.03*sqrt(3*Freq.^3-Freq.^2 + Freq))+1.3;
plot(Freq,Pow,'color','k','linewidth',4)
hold on

x = [0 5 5 0];
y = [0 0 2.5 2.5];
h=patch(x,y,'g');
set(h,'facealpha',0.3,'edgecolor','none')

x = [5 15 15 5];
y = [0 0 2.5 2.5];
h=patch(x,y,'r');
set(h,'facealpha',0.3,'edgecolor','none')

x = [15 25 25 15];
y = [0 0 2.5 2.5];
h=patch(x,y,'b');
set(h,'facealpha',0.3,'edgecolor','none')