Plotting two plots with 2 different y axes

Hi Everyone,

Hope everyone is doing great and having a great easter break.

I have minor issue regarding plotting two plots with two y-axes. I tried plotyy but i didnt work as I kept getting error message that vectors should be of same length.

spot_y = (3000:500:13000)';
delta_y = (-1:0.1:1)';
plotyy(spot(:,1),spot_y,portdelta(:,1),delta_y)

spot(:,1) and portdelta(:,1) are what I would like to plot and their length is 108. I am not sure what am I doing wrong.

Can anyone please help? Thank you in advance.

Answer 1

[Walter Roberson]

Well, length(spot_y) isn't 108, and neither is length(delta_y).

It would be unusual to be plotting data with variable x coordinates but with regularly spaced y coordinates.

I wonder if you meant

plotyy(spot(:,1),portdelta(:,1), spot_y, delta_y)

Or maybe you want

spot_y = linspace(3000, 13000, size(spot,1)) .';
delta_y = linspace(-1, 1, size(delta_y,1)) .';
plotyy(spot(:,1),spot_y,portdelta(:,1),delta_y)