How to set legend marker size

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RuiQi
RuiQi 2017-7-16
编辑： Monique 2024-7-24
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
Carl Witthoft 2019-4-11
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
  11 个评论
显示 9更早的评论
Gayan Lankeshwara
Gayan Lankeshwara 2020-6-21
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
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
Akira Agata 2017-7-16
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');
  2 个评论
Arnoud Jochemsen
Arnoud Jochemsen 2022-2-15
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');
Monique
Monique 2024-7-24
编辑：Monique 2024-7-24
I just discovered something interesting (likely a bug). If you ask for 2 outputs, then the legend markers are actually the correct size. No idea why. (This is R2024a).
plot(magic(4),'o','MarkerSize',15);
[l1,l2] = legend('a','b','c','d');

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Walter Roberson
Walter Roberson 2017-7-16
  2 个评论
Fernon Ejikhoudt
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.

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