Plot two lines with a left y axis and one with a right y axis

I am trying to plot three lines, A, B, and C. A and B have the same scale and the y-axis is on the left. C has a very different scale and the y-axis needs to be on the left. How do I do this?

This is what I have tried:

I can use plotyy because it only allows 2 plots, one for each axis.

I also tried:

plot(A, features...)
hold all; 
plotyy(B,C,features...)

where features are the color, line thickness, etc. This just plotted plotyy on top of the orginal plot but messed up all the features from A and I still could not figure out how to change the features in plotyy.

Thank you!

Answer 1

[Jan]

Perhaps something like this:

x  = linspace(0,2*pi, 20);
y1 = cat(1, sin(x1), cos(x1));
y2 = x .^ 3;
plotyy(x,y1, x,y2);

If this does not match your needs, use the AXES handles replied by plotyy as 'Parent' property for the next plot or line command.

[Chris]

Thnx! This helped me a lot!

Answer 2

[Walter Roberson]

h = plotyy(A, features, C, features);
hold(h(1),'all');
plot(h(1), B, features);

[Walter Roberson]

Note: this is the same solution as using the Parent property. Passing an axes as the first parameter to plot is the same as using that axes as a 'Parent' parameter.