MATLAB: Scatter plot using secondary axis of plotyy

plotyyscatter

Hi, First of all, thanks to the community, I have learnt so much just reading the answers to many posed questions. My problem is: I am trying to overlay two scatter plots using the left and the right y axis after a do a plotyy command.
I tried:
[ax, p1, p2]=plotyy(x1,y1,x2,y2);
scatter(x1,y3);     %it works and it uses the left y axis
scatter(ax(2), x1, y4)    % it doesn't work..
Do you have any suggestion? Any help would be appreciated.
Best, Dani

Best Answer

[ax, p1, p2]=plotyy(x1,y1,x2,y2);
hold(ax(1),'on')
scatter(ax(1),x1,y3);
hold(ax(2),'on')
scatter(ax(2),x1,y4)
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