t=0:1000;
A=1000;
a=2.005;
b=2.005;
z1=A*exp(.a*t);
z2=cos(b*t);
[haxes,hline1,hline2]=plotyy(t,z1,t,z2,'semilogy','plot');
%獲取兩個(gè)坐標(biāo)軸和兩個(gè)線條對(duì)象的句柄
axes(haxes(1));
ylabel('semilog plot');      %標(biāo)注左邊的y軸
axes(haxes(2));
ylabel('linear plot');        %標(biāo)注右邊的y軸