MATLAB "hold on" subplot demo for Gavin

gistfile1.txt

x = 1:50;
figure
subplot(1,2,1)
hold on
plot(x, randn(size(x)),'bs-')
plot(x,sin(x),'r+-')
set(gca,'ylim',[-3 3])
plot(x,repmat(1,size(x,2)),'r-','linewidth',2)
plot(x,repmat(-1,size(x,2)),'r-','linewidth',2)
subplot(1,2,2)
hold on
plot(x, rand(size(x))*2 - 1,'bs-')
plot(x,cos(x),'r+-')
set(gca,'ylim',[-3 3])
plot(x,repmat(1,size(x,2)),'r-','linewidth',2)
plot(x,repmat(-1,size(x,2)),'r-','linewidth',2)