How to show partial legend in figure

Question

Aravin 2012-1-5

3
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https://ww2.mathworks.cn/matlabcentral/answers/25381-how-to-show-partial-legend-in-figure

评论： Julien 2024-6-8

采纳的回答： Dr. Seis

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Dear All,

I just want to show the partial part of my legend in Figure.

For example.

plot([1:10],'Color','r','DisplayName','This one');hold on;
plot([1:2:10],'Color','b','DisplayName','This two');
plot([1:3:10],'Color','k','DisplayName','This three');

Lets say I want to display only Last two or First two or first and last legend titles with proper colors.

Could anyone suggest plz.

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Answer 1

Dr. Seis 2012-1-5

13
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To take your first example:

h = zeros(1,3);
h(1) = plot([1:10],'Color','r','DisplayName','This one');hold on;
h(2) = plot([1:2:10],'Color','b','DisplayName','This two');
h(3) = plot([1:3:10],'Color','k','DisplayName','This three'); hold off;
legend(h(2:3)); % Only display last two legend titles

If you didn't have "DisplayName", then you would have to manually add these string to the legend:

legend(h(2:3),'This two','This three');

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Answer 2

Jon 2017-4-13

21
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编辑：Jon 2017-4-13

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Posting this here because none of the above helped me. If you don't have control of how the figure was plotted (i.e. it was buried in someone else's code), you can pull it out of the figure's children. So if you have 6 graphs and only want the legend to display a certain two, then write:

f=get(gca,'Children');
legend([f(2),f(6)],'second graph','sixth graph')

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Dave 2018-1-27

编辑：Dave 2018-1-27

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I think this is helping me, but I am unsure about the next step. Lets say I have 20 lines plotted -- 2 are red, 8 are blue, and the rest are black. When I use Jon's suggestion ["f=get(gca,'Children');"] I end up with "f" being a 20x1 Line object.

Now how do I process "f" to find the red lines? The documentation on accessing property data is either too simple or I am. My ultimate goal is to do something like this:

> red_indx = find(f.Color == 'r');   %what I want to do, does not work
> blue_indx = find(f.Color == 'b');  %what I want to do, does not work
> legend([f(red_indx(1)) f(blue_indx(1))],'Red Line','Blue Line');

so that I only have one legend entry for all the red lines and one legend entry for all the blue lines.

Can someone provide some guidance to documentation (or some example commented code) that can help me implement the generation of red_indx and blue_indx above? Nothing I have tried to get a result has worked -- I think because I really do not understand the primitive Line structure or how to work with it.

YU CHEN 2021-6-7

Perfect！Thank you very much！

Julien 2024-6-8

Ya da best!

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Answer 3

the cyclist 2012-1-5

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Here's one way:

h1=plot([1:10],'Color','r','DisplayName','This one');hold on;
h2=plot([1:2:10],'Color','b','DisplayName','This two');
h3=plot([1:3:10],'Color','k','DisplayName','This three');
legend([h1 h3],{'Legend 1','Legend 3'})

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Sean de Wolski 2012-1-5

+1. This should probably be added to the FAQ.

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Answer 4

Patrick Kalita 2012-1-5

4
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the cyclist's solution of passing plot handles to the legend command is good. But if you're feeling adventurous, you can also use the plot's Annotation property. It is described in the documentation here. For example:

h(1) = plot([1:10],'Color','r','DisplayName','This one');hold on;
h(2) = plot([1:2:10],'Color','b','DisplayName','This two');
h(3) = plot([1:3:10],'Color','k','DisplayName','This three');
set( get( get( h(2), 'Annotation'), 'LegendInformation' ), 'IconDisplayStyle', 'off' );
legend show