Plotting data using multiple axes

2017 4 7
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更新时间：2017 4 7
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Hi I'm currently trying to plot three sets of data (airfoil geometry, tangential velocity, coeff. of pressure) using the plot function.
figure
hold on;
plot(xc,yc);
plot(xi,vtan);
plot(xi,-1*cp);
ylim([0,2]);
hold off;
This is currently my code (picture of out put below). I need a way to get the data for plot(xi,vtan)[red line] and plot(xi,-1*cp)[yellow line] to be plotted against a secondary Y axis, so that I can enlarge the line for plot(xc,yc) [blue line] on the primary left axis. Any idea on how to do this? thanks.

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