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How can one show variable values in legend of a plot?

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alpedhuez
alpedhuez on 29 May 2020
Commented: alpedhuez on 30 May 2020
For title, I see that
plot((1:10).^2)
f = 70;
c = (f-32)/1.8;
title(['Temperature is ',num2str(c),' C'])
But I do not know how to make this work in case of legend with more than two labels. Please advise.

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alpedhuez
alpedhuez on 29 May 2020
legend1 = sprintf('Only Solar Generation[Integrated = %0.2f KW]', num1);
legend2 = sprintf('Whatever...%f', num2);
legend3 = sprintf('Whatever...%.1f', num3);
legend(legend1, legend2, legend3);
dpb
dpb on 29 May 2020
fmts = {'Only Solar Generation[Integrated = %0.2f KW]';
'Whatever...%f';
'Whatever...%.1f'};
nums=[a b c].';
legends=compose(fmts,nums);
hLg=legend(legends);
saves generating and having to use sequentially-named variables and the need to edit all of them in case something changes. This way all the edits are in one place and the number, order, etc., etc., etc., ... are all independent of the code--and vice versa.

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Accepted Answer

dpb
dpb on 29 May 2020
Edited: dpb on 30 May 2020
Just build the desired string array -- num2str works nicely here alto you have to ensure the values are in a column vector to avoid them being all strung out in one long string instead of as an array...
labels=num2str([1:5].','Weather Station %d');
plot(randn(5))
legend(labels,'location','best')
results in
Or, you can use the 'DisplayName' property of each line when you plot and legends will show automagically.

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More Answers (1)

Ameer Hamza
Ameer Hamza on 29 May 2020
Run this example
T = 1:3;
Legends = compose('Temp is %d', T);
hold on;
plot(rand(1,10));
plot(rand(1,10));
plot(rand(1,10));
legend(Legends)

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