How to label the secondary axis of a graph

Question

Earle Jamieson 2012-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/38249-how-to-label-the-secondary-axis-of-a-graph

Hi,

This is a simple question, but I can't seem to find the answer to it anywhere... how do I add a label to the secondary (RHS) axis of a graph made using plotyy? I am curretly using ylabel but of course only one axis can be labelled that way.

Thanks

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Answer 1

Oleg Komarov 2012-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/38249-how-to-label-the-secondary-axis-of-a-graph#answer_47687

在 MATLAB Online 中打开

The 4th syntax of ylabel shows explixitly than you can 'refer' to a specific axis.

Which means that you have to use the last syntax of plotyy to retrieve the handles to both axes and then feed it to ylabel. You can also set the labels as shown in the example (of the documentation).

An example with ylabel

figure
x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
[AX,H1,H2] = plotyy(x,y1,x,y2,'plot');
ylabel(AX(1),'Something')
ylabel(AX(2),'Else')