How to change the font size of the second y axis of a MATLAB subplot fig file without the original data?

I was given MATLAB figure files with four subplots. The last subplot has two y axes, and I need to change the font size of the second y axis. I do not have the original data, only the figure files. How do I do this?

Answers


First let's create a figure similar to what you described, and save it to a FIG file:

for i=1:3
    subplot(2,2,i)
    plot(rand(10,1))
end
subplot(224), plotyy(1:10, rand(10,1), 1:10, randn(10,1))

hgsave myfigure.fig

Now we load the figure from file, and look for the second axis of PLOTYY. Once we have its handle, we can change any property we want.

hFig = hgload('myfigure.fig');
hAx = findobj(hFig, 'type','axes', '-and', 'YAxisLocation','right');
set(hAx, 'FontSize',16, 'XTick',[])

Just keep in mind that the way PLOTYY works is by creating two superimposed axes, each with its own x/y-labels. That's why I suppress the x-labels for the second when I change the font size, to avoid seeing two sets of labels on top of each other (each in a different font size).


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