How to add a secondary axis to a .fig ?

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I know that a secondary axis can be added using e.g. yyaxis and that its properties can then also be edited in the property editor of the figure. However I could not find how to add a secondary axis to a saved .fig, how would one do that ?

Accepted Answer

Johannes Hougaard
Johannes Hougaard on 3 Nov 2021
Use the function 'open' to load the saved figure to a variable (a handle) and use yyaxis to add the secondary axis
figure;
axes;
x = linspace(-4*pi,4*pi,200);
plot(x,sin(x))
savefig(gcf,'newfigure.fig');
nf = open('newfigure.fig');
yyaxis(nf.CurrentAxes,'right');
plot(x,cos(x./3))

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