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

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alpedhuez
alpedhuez 2020-5-29
评论： PRAJWAL KUMAR A 2022-6-7
For title, I see that
https://www.mathworks.com/matlabcentral/answers/154272-input-a-variable-into-a-plot-title
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.
  2 个评论
alpedhuez
alpedhuez 2020-5-29
编辑：alpedhuez 2020-5-29
legend1 = sprintf('Only Solar Generation[Integrated = %0.2f KW]', num1);
legend2 = sprintf('Whatever...%f', num2);
legend3 = sprintf('Whatever...%.1f', num3);
legend(legend1, legend2, legend3);
https://www.mathworks.com/matlabcentral/answers/472916-can-i-acess-value-of-variable-in-legend-of-plot
dpb
dpb 2020-5-29
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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采纳的回答

dpb
dpb 2020-5-29
编辑：dpb 2020-5-30
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.

更多回答（1 个）

Ameer Hamza
Ameer Hamza 2020-5-29
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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