Plotting 4 data sets on 2 y axis

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Richard
Richard on 25 Feb 2011
Answered: Andreas on 18 May 2020
I have searched matlab help, and various forums for an answer to this, so far without success, which is surprising, as it seems to be a relatively straight forward task.
I currently have 4 data sets that I have imported from a csv file, which are all charted against time (I have also created a time vector to plot against). The 4 data sets are EMG data, which shows muscle usage, as a voltage between 0 and 0.3, and then the angle of the ankle, knee, and relative angle between the two, all of which are in degrees.
What I'm wanting to do is put volts up the left axis, and degrees up the right (or visa-versa), then plot the 4 lines, preferably in different colours, and add a legend. So far all I have really come up with is plotyy, which seems to be happy plotting two of the data sets against each other on 2 axis, but not 4.
Any help would be very much appreciated!

Answers (2)

the cyclist
the cyclist on 25 Feb 2011
I've never done this before, and I am definitely not sure this is the best way, but it is a way.
time = 1:10;
y1 = 1:10;
a1 = 2:11;
a2 = 3:12;
a3 = 4:13;
figure
hold on
[ax,h1,h2] = plotyy(time,y1,repmat(time,[3 1])',[a1;a2;a3]');
legend([h1;h2],{'volts','angle 1','angle 2','angle 3'})

Andreas
Andreas on 18 May 2020
Answer maybe a bit outdated, but according to this
maybe use
yyaxis right
or
yyaxis left

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