Question

I have a plotyy figure in MATLAB with 2 vectors in on each y axis.

plotyy(x1,[y1(:),y2(:)], x1,[y3(:),y4(:)])

I need to format each of the lines separately, but can not find the documentation about how to do this. Can someone please me show an example?

Answer 1

Does the following example code help?

%# Generate some data
N = 20;
X = (1:N)';
Y1 = randn(N, 1);
Y2 = randn(N, 1);
Y3 = randn(N, 1) - 50;
Y4 = randn(N, 1) - 50;

%# Perform the plotyy, returning an axes handle, and a handle for both figures
[Axes, fig1, fig2] = plotyy(X, [Y1 Y2], X, [Y3 Y4]);

%# Change the format of Y1 and Y2 (separately)
set(fig1(1), 'LineStyle', ':');
set(fig1(2), 'LineStyle', '--');

%# Change the format of Y3
set(fig2(1), 'LineStyle', '-.');

In the above code, the figure handle fig1 corresponds to the first y-plot, ie Y1 and Y2, and I can access the individual lines by indexing fig1 with 1 and 2.

Similarly, the figure handle fig2 corresponds to the second y-plot, ie Y3 and Y4, and I access Y3 by indexing this handle with 1. I could also access Y4 with fig2(2), if I so desired.