How to plot second y axis y2 that is just related to y1 as f(y1)

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Ole
Ole 2016-6-30
回答： dpb 2016-7-1
I have a plot on y1 axis. I would like to have units conversion on axis y2, as f(y1).
How can you plot two units on one graph ? That will assume that horizontally the unit conversion is correct.
Thank you.
x = linspace(0.1,20,100);
y1 = x.^2;
y2 = x^.4./2x; % for example unit conversion for y2 axis no graph to plot
plot(x,x.^2)

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回答（1 个）

dpb
dpb 2016-7-1
plotyy is about the simplest; it computes "nice" axes limits automagically that line up over the ranges of the two axes--
y2 = x.^.4./(2*x);
plotyy(x,y1,x,y2)
legend('y1','y2','location','best')
yields the following:

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