% test of plotyy function, L. Braile, EAS 509, October 16, 2002
% show how plotyy can be used, how to reverse an axis and how
% to set the axis limits.
% Define two functions
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');  % the array AX returns "handles"
% (identifiers) to the two y axes
axes(AX(1))  % select the first y axis (left side)
axis([0 20 -200 200]);  % set the axis limits
set(gca,'YDir','reverse')  % reverse the direction of the axis
axes(AX(2))  % select the second y axis (right side)
axis([0 20 -0.8 0.8]);  % set the axis limits