Create a plot with 2 left axes and 1 right axis

Hi!

I want to plot three datasets on top of each other (same plot not subplots). Each has its own units so I want to have two different axes/scales on the left side and one on the right. I know how to plot double axes with yyaxis left and yyaxis right. Can I do two yyaxis left lines or something?

Answer 1

[Sai Sri Pathuri]

To plot three datasets on top of each other, set hold command to ON after creating axes object.

axes;      
hold on; 

The axes command creates an axes object with y-axis on the left by default. Then a yyaxis left and yyaxis right can be used to create another y-axis on left and a y-axis on right respectively.

For more information, refer the following link for documentation:

yyaxis - https://in.mathworks.com/help/matlab/ref/yyaxis.html

[F S]

Your link only shows how to create a plot with two yaxis, one on the left and one on the right respectively. So does your example. The question asked how to create a plot with three yaxis in the same axes.

Is there a way to plot three yaxis into the same axis, e.g. with ticks going in and out on the side with two yaxis?

Answer 2

[DGM]

I don't know how it would be done with yyaxis (if possible)

There are a number of old tools on the File Exchange that still work.

https://www.mathworks.com/matlabcentral/fileexchange/1017-plotyyy

https://www.mathworks.com/matlabcentral/fileexchange/9016-addaxis (aa_splot.m needs edited; see FEX comments)

and you can search for others.

x = 1:10;
y1 = x;
y2 = x*10 + 2*rand(1,10);
y3 = x/10 + rand(1,10);

% using plotyyy()
plotyyy(x,y1,x,y2,x,y3,{'this one','that one','the other one'});

% using addaxis()
figure
plot(x,y1);
addaxis(x,y2);
addaxis(x,y3);
addaxislabel(1,'this one');
addaxislabel(2,'that one');
addaxislabel(3,'the other one');