Superimposing Graphs with large difference in Y-axis values

I have a graph a=exp(-0.2*x).*sin(x), with x in the range x = 0:pi/20:6*pi. I want to superimpose another graph z=exp(3*x).*cos(x) with the same x range to the other graph. I have tried it, the code is pos_combined_code. The graph displayed is pos_combined. It seems the a graph is not displayed. Only the z graph is displayed. I suspect the reason is the y-axis value for z is much bigger than a, and therefore it is impossible to display those 2 graphs together. I have attached graph a when plotted alone(graph a alone.jpg).

Anyone knows how to display these 2 graphs together in this situation? Thanks.

Answer 1

[Simon Chan]

Try function yyaxis

[Kevin Holly]

x = 0:pi/20:6*pi

x = 1×121

0 0.1571 0.3142 0.4712 0.6283 0.7854 0.9425 1.0996 1.2566 1.4137 1.5708 1.7279 1.8850 2.0420 2.1991 2.3562 2.5133 2.6704 2.8274 2.9845 3.1416 3.2987 3.4558 3.6128 3.7699 3.9270 4.0841 4.2412 4.3982 4.5553

a=exp(-0.2*x).*sin(x)

a = 1×121

0 0.1516 0.2902 0.4132 0.5184 0.6043 0.6700 0.7151 0.7397 0.7444 0.7304 0.6991 0.6524 0.5923 0.5211 0.4414 0.3556 0.2661 0.1755 0.0861 0.0000 -0.0809 -0.1548 -0.2204 -0.2765 -0.3224 -0.3575 -0.3815 -0.3946 -0.3971

z=exp(3*x).*cos(x) 

z = 1×121

1.0e+24 * 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000

figure
plot(x,a)

figure
plot(x,z)

figure
plot(x,a)
hold on
plot(x,z)

figure
yyaxis left
plot(x,a)
yyaxis right
plot(x,z)

[Starry]

Thanks Simon Chan and Kevin Holly.