matlab添加网格

clear all;
x=linspace(0,10);
y=sin(x);
y2=sin(3*x);
figure;
ax1=subplot(2,1,1);
plot(x,y);grid on;%添加网格
ax2=subplot(2,1,2);
plot(x,y2);grid on;grid off;%取消网格的显示