How to set legend marker size

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RuiQi 2017-7-16

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评论： Arnoud Jochemsen 2022-2-15

How do I change the marker size on the legend ? I can change the font size but not marker.

l = legend('Orientation', 'Horizontal', 'RNN (Ours)', 'SLIC', 'SEEDS', 'LSC', 'ERS', 'FH');
l.FontSize = 20;
%l.MarkerSize = 20; does not work
%l.markersize = 20; does not work
set(l,'Position', [0.4 0 0.2 0.2], 'Units', 'normalized');
%set(l,'MarkerSize', 20); does not work

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回答（3 个）

Carl Witthoft 2019-4-11

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Best way: see Stackoverflow question 2871747

% thanks to , Luis Mendo and Lea
[~, objh] = legend({'one plot', 'another plot'}, 'location', 'NorthWest', 'Fontsize', 14);
%// set font size as desired
% note that even if you plot(x,y,'.') it's a "line" plot 
objhl = findobj(objh, 'type', 'line'); %// objects of legend of type line
set(objhl, 'Markersize', 12); %// set marker size as desired
% or for Patch plots 
objhl = findobj(objh, 'type', 'patch'); % objects of legend of type patch
set(objhl, 'Markersize', 12); % set marker size as desired

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Gayan Lankeshwara 2020-6-21

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I am working in Matlab 2019a, but Carl's code does not work in my case for a line plot.

objhl = findobj(objh, 'type', 'line'); %// objects of legend of type line
set(objhl, 'Markersize', 12); %// set marker size as desired

I mean, even if I change the value of MarkerSize, nothing changes.

Any update ?

Thanks.

Walter Roberson 2020-6-21

Are you using legend() with at least two output arguments? If you only have one output for legend then legend works differently.

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Akira Agata 2017-7-16

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How about changing the marker size of your plot? Here is an example.

plot(magic(4),'o','MarkerSize',10);
l = legend('a','b','c','d');

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Arnoud Jochemsen 2022-2-15

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Note that this only works up to a certain size. When using 15 instead of 10, the legend markers are clearly smaller than the plot markers.

plot(magic(4),'o','MarkerSize',15);
l = legend('a','b','c','d');

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Walter Roberson 2017-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/348946-how-to-set-legend-marker-size#answer_274359

The exact version you are using makes a difference now.

https://www.mathworks.com/matlabcentral/answers/163625-how-to-enlarge-legend-marker-size-in-r2014b

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Fernon Ejikhoudt 2018-7-11

I have the same problem and I'm using 2018a. Is there an answer to this. otherwise it almost makes the printed graphs useless because of the extremely tiny dots.