legend for multiple plots

Question

nadia naji 2022-5-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1730905-legend-for-multiple-plots

评论： Voss 2022-5-31

Hello,

I have 4 matrix with 6 rows and 15 columns. I want to plot all these matrix in on plot. for this aim I used the followin code:

x=1:15
plot(x,res540,'-r')
hold on
plot(x,res720,'--b');
plot(x,res900,'-.g');
plot(x,res1080,':k','LineWidth',0.2);

now I need to put a legend for above code in one plot. but each method I used for it does not work or all legend has same color and style. what should I do for this? Thanks

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Answer 1

Voss 2022-5-31

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% some matrices:

res540 = rand(6,15);

res720 = 1+rand(6,15);

res900 = 2+rand(6,15);

res1080 = 3+rand(6,15);

% store the line handles returned from plot;

% each plot call returns 6 lines

h = zeros(6,4);

x=1:15;

h(:,1) = plot(x,res540,'-r');

hold on

h(:,2) = plot(x,res720,'--b');

h(:,3) = plot(x,res900,'-.g');

h(:,4) = plot(x,res1080,':k','LineWidth',0.2);

% make a legend for the 1st line returned from

% each plot call (i.e., first row of h)

legend(h(1,:),{'540' '720' '900' '1080'})

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nadia naji 2022-5-31

Great. Thank you.

Voss 2022-5-31

You're welcome!

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Answer 2

Bjorn Gustavsson 2022-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/1730905-legend-for-multiple-plots#answer_975180

在 MATLAB Online 中打开

Use the outputs from plot to explicitly control what is show in the legend:

x=1:15
ph1 = plot(x,res540,'-r');
hold on
ph2 = plot(x,res720,'--b');
ph3 = plot(x,res900,'-.g');
ph4 = plot(x,res1080,':k','LineWidth',0.2);
legend([ph1(1),ph2(1),ph3(1),ph4(1)],'t1','t2','t3','t4')