How to set a legend with a label for two or more lines?

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Lemuel Carlos Ramos Arzola 2020-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/504277-how-to-set-a-legend-with-a-label-for-two-or-more-lines

评论： Adam Danz 2020-2-8

采纳的回答： Jeremy

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Hello,

In the graphic legend I want to share the same label for two or more lines.

For example, I have two (or more) pair of data

x = linspace(0,0.5);
for i = 1:3
    y1(i,:) = x.^2 + i;
    y2(i,:) = (2*x).^2 + i;
end

My plot instructions are

hold on
plot(x,y1,'-')
set(gca,'ColorOrderIndex',1)
plot(x,y2,'--')
legend({'label 1','label 2','label 3'})

I want that the first curves of y1 and y2 share the label “label 1” and so on for the second and the thirds lines, “label 2” and “label 3”, respectively. Something like this

Thanks in advance for the answers.

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Lemuel Carlos Ramos Arzola 2020-2-7

Excellent alternative solution.

Thanks

(but the actual problem is unsolved)

Adam Danz 2020-2-7

I understand. Walter pointed you to a function on the file exchange that might be helpful in building a custom legend.

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采纳的回答

Jeremy 2020-2-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/504277-how-to-set-a-legend-with-a-label-for-two-or-more-lines#answer_414409

在 MATLAB Online 中打开

This isn't a particularly elegant solution, but I think it does what you want.

x = linspace(0,0.5);
for i = 1:3
    y1(i,:) = x.^2 + i;
    y2(i,:) = (2*x).^2 + i;
end
hold on
plot(x,y1,'-')
set(gca,'ColorOrderIndex',1)
plot(x,y2,'--')
[lh, labelhandles] = legend({'label 1','label 2','label 3'});
labelhandles(5).LineStyle = '--';
labelhandles(4).YData = [0.83 0.83];
labelhandles(5).XData = [0.0460 0.5057]; labelhandles(5).YData = [0.760 0.760];

This will only update one of the legend entries, I trust you can extend this solution to the others. You could also choose a labelhandles variable with a shorter name to make it look a little neater, if you wanted.

Your YData property can be tweaked until you are happy with the appearance.