datetick with plotyy

How do I change the x-axis to dates?

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');

datetick('x','yyyy')

makes two x-axis???

Answer 1

[Paulo Silva]

datetick(AX(1),'x','yyyy')

If that still doesn't do what you want you can clear other axis Ticks

set(AX(2),'XTick',[])