How do I adjust legend fontsize after changing legend marker size?

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Jon
Jon 2017-6-8
编辑： Adam Danz 2024-10-7
There seems to be some kind of glitch in my Matlab program (Using R2016b). I am following the steps to change the marker size from this this URL. I can use their example and it will indeed change the marker size:
plot(1:10, 'o-');
hold on
plot(5:12, 'r*--'); %// example plots
[~, objh] = legend({'one plot', 'another plot'}, 'location', 'NorthWest', 'Fontsize', 14);
%// set font size as desired
objhl = findobj(objh, 'type', 'line'); %// objects of legend of type line
set(objhl, 'Markersize', 12); %// set marker size as desired
However, unlike their example, the fontsize in my image stays fixed. If I try to change fontsize through normal methods, for example,
[~, objh] = legend({'one plot', 'another plot'}, 'Fontsize', 25);)
it will change the box size of the legend, but not the font, as seen in the image below. The font size only becomes fixed when I designate a second output variable in the legend command, in this case, by assigning objh1. So if I just wrote
leg = legend({'one plot', 'another plot'}, 'Fontsize', 25);)
then it would change the font as expected. Because the example in my original URL changes font size correctly, I think this is a problem with my MATLAB software. Is it a version problem or something unusual on my end? I did reinstall the software and still have the same problem.
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pcidreir
pcidreir 2019-5-1
I'm actually experiencing a similar issue on a subplot. When I increase the lengend size, the box increases, but the text font remains the same. I'm using matlab 2018a

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回答（1 个）

Adam Danz
Adam Danz 2019-5-1
编辑：Adam Danz 2024-10-7
The only currently supported output to legend() is the legend handle (link to docmentation). Starting in R2024b, calling legend with multiple outputs will throw a warning.
When the undocumented, second output is included, it interferes with the ability to change the fontsize of the legend (using r2019a).
Successful example
plot(magic(3))
lh = legend('First', 'Second', 'Third');
lh.FontSize = 14; %or set(lh, 'FontSize', 14)
Buggy example
plot(magic(3))
[lh, lineObj] = legend('First', 'Second', 'Third');
lh.FontSize = 14; %or set(lh, 'FontSize', 14)
If the fontsize is specified in the call to legend, the function behaves as expected.
[lh, lineObj] = legend('First', 'Second', 'Third', 'FontSize', 14); % OK
Other differences when the second output is included are
  • AutoUpdate property is set to 'off' rather than 'on'
  • the UIContextMenu is an empty graphics place holder rather than the default legend context menu.
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Afiq Azaibi
Afiq Azaibi 2024-10-7
Starting in R2024b, calling legend with multiple outputs will throw a warning. It will continue to function as it has previously.

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