MATLAB作图：plotyy使用方法。即：横坐标相同，纵坐标不同的两条曲线画在同一图上进行比对。

例1. 需要采用图形句柄,详细内容参考MATLAB帮助文件有关plotyy的例程

%%This example graphs two mathematical functions using plot as the

plotting function. The two y-axes

%%enable you to display both sets of data on one graph even though

relative values of the data are quite

%%different.

x = 0:0.01:20;

y1 = 200*exp(-0.05*x).*sin(x);

y2 = 0.8*exp(-0.5*x).*sin(10*x);

[AX,H1,H2] =

plotyy(x,y1,x,y2,'plot');

用[AX,H1,H2]=plotyy(x,y1,x,y2);命令。AX(1),AX(2)分别为左右Y轴的句柄

%%You can use the handles returned by plotyy to label the axes and

set the line styles used for plotting.

%%With the axes handles you can specify the YLabel properties of

the left- and right-side y-axis:

set(get(AX(1),'Ylabel'),'String','Slow Decay')

set(get(AX(2),'Ylabel'),'String','Fast Decay')

%%Use the xlabel and title commands to label the x-axis and add a

title:

xlabel('Time (\musec)')

title('Multiple Decay Rates')

%%Use the line handles to set the LineStyle properties of the left-

and right-side plots:

set(H1,'LineStyle','--')

set(H2,'LineStyle',':')

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例2. 线型设置：

t=0:.1:8;

[ax,h1,h2]=plotyy(t,sin(t),t,cos(t));

set(h1,'linestyle','-','marker','o','color','r');

set(h2,'linestyle',':','marker','x','color','b');

加注图例：

x=linspace(0,2*pi,40);

[ax,h1,h2]=plotyy(x,sin(x)+cos(x),x,exp(x));

set(h1,'linestyle','-')

set(h2,'linestyle','-')

set(h1,'marker','o')

set(h2,'marker','+')

hold on

x=linspace(0,2*pi,40);

hh=line(x,cos(x));

set(hh,'linestyle','-')

set(hh,'marker','s')

hold on

hhf=line(x,sin(x));

set(hhf,'color','r')

set(hhf,'linestyle','-')

set(hhf,'marker','*')

legend([h1,h2,hh,hhf],'sin(x)+cos(x)','exp(x)','cos(x)','sin(x)',0);

坐标轴标注：

figure;

t=0:.1:3*pi;

[H,Ha,Hb]=plotyy(t,sin(t),t,exp(t));

d1=get(H(1),'ylabel');

set(d1,'string','yayacpf');

d2=get(H(2),'ylabel');

set(d2,'string','bbs from hit','fontsize',18);