Multiple lines for a single legend entry

2020 5 5
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更新时间：2021 9 6
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Hi!
I was wondering if it is possible to add a single legend for multiple lines, like here:
https://matplotlib.org/3.2.1/gallery/text_labels_and_annotations/legend_demo.html
Thank you in advance!

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David Neussl
David Neussl 2021-9-3

2 个投票

Hi, i think i may have a solution for your problem. My approach was to "plot" invisible NaNs, give them the color i want and create legend entries for those NaNs.
For example: Lets say we have 6 lines (10 data points each), where the first 3 are of GROUP 1 and the last three are of GROUP 2:
data = rand(10,6);
cm = colormap('lines'); % Get default line colors
figure, hold on;
for i = 1:6
% Get index for line colors (GROUP1=1:3, GROUP2=4:6)
if i <= 3
colorindex = 1;
else
colorindex = 2;
end
% Turn HandleVisibility off to disable legend entries for these lines
plot(data(:,i), 'Color', cm(colorindex,:), 'HandleVisibility', 'off');
end
% These nans will be invisible
plot(NaN, 'DisplayName', 'GROUP 1', 'Color', cm(1,:));
plot(NaN, 'DisplayName', 'GROUP 2', 'Color', cm(2,:));
% Show legend
legend('Location', 'Best');
This then gives this plot as a result

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Szilard Novoth
Szilard Novoth 2021-9-6
编辑：Szilard Novoth 2021-9-6
That is a clever workaround, thank you :)
The perfect solution would be, if I could give a single legend for two (or more) different lines.
For example you have 3 red lines, but maybe I want to differentiate these lines by having one dashed and another one dotted, but still only have the legend GROUP 1
Like:
red ‘-‘, ‘:’, ‘.’ GROUP1
blue ‘-‘, ‘:’, ‘.’ GROUP2

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