Legend colors match with plot

Question

Rosario Frontino 2022-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/1687404-legend-colors-match-with-plot

编辑： the cyclist 2022-4-3

Hi. I have a for loop in which I plot some curves with different colors.

P=[0.25 0.25 0.2 0.15 0.15];
color = {'r','c','g','y','b','m','k'};
for i=1:numel(P)
        plot(1:N,nElemMat(:,i),color{i}); yline(P(i)); hold on; 
end   

I would like to have a legend in which each color represent the correspondent P(i) (red -> 0.25 , cyan -> 0.25, green -> 0.20,...).

I tried with

legend('0.25', '0.25', '0.2','0.15','0.15');

but colors don't match and I'm not using P.

Do you have any suggestion? Thanks

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Answer 1

the cyclist 2022-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/1687404-legend-colors-match-with-plot#answer_933504

编辑：the cyclist 2022-4-3

在 MATLAB Online 中打开

Here is one way to code this (assuming I understand what you meant):

rng default

N = 3;

P=[0.35 0.25 0.2 0.15 0.10];

nElemMat = rand(N,numel(P));

color = {'r','c','g','y','b','m','k'};

figure

hold on

for i=1:numel(P)

plot(1:N,nElemMat(:,i),color{i})

hy(i) = yline(P(i));

set(hy(i),'Color',color{i})

end

legend(hy,color)

Warning: Ignoring extra legend entries.

The code changes I made were

Assign a handle to each yline, so that I could assign the color to each one. (This is the main thing you wanted.)
Create the figure explicitly, and execute hold on just once.
Define variables that you didn't have in your code, so I had a piece of self-contained code that would run.
Changed the values of P, so you see every line

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Rosario Frontino 2022-4-3

Thanks for your answer and the explanation. My main problem is the legend for the plot.

I would like to have a legend in the form (P(i) -> color(i)). Is it possible?

the cyclist 2022-4-3

编辑：the cyclist 2022-4-3

在 MATLAB Online 中打开

Sorry, I missed the part about a legend.

I've edited the code to show how to use the handles as an input to legend.

Note that the my code here is a bit weird, because I am using the handles to the horizontal lines, not to the plot lines themselves (but you seem to have a one-to-one correspondence, so that is OK). You could also have assigned handles to the plot lines themselves instead:

hp(i) = plot(...)

and assigned a legend based on those. That would be the norm, actually.

Also, I just used the color names themselves as the legend text. Obviously, you don't need to do that.

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