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Aravin
0

Split legend of figure into multiple columns ?

Asked by Aravin
on 1 Jan 2012
Latest activity Commented on by Praveen Teleti on 10 Apr 2019
Accepted Answer by Jan
Dear All,
I have one figure which have many curves. I can't show my legend inside the figure so I have to show them outside. There are two possible layouts(orientation) of legends:
  1. Vertical
  2. Horizontal
In both orientation, legend gets too big to display. It can be displayed properly if and only if I could split legend into multiple columns. Like in first column I show 10 curves name and in second column I show next 10. I could not figure it either it is possible or not?
Any suggestion will be highly appreciated.

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4 Answers

Answer by Jan
on 1 Jan 2012
 Accepted Answer

See:
Lookinf in the FileExschange is always a good idea.

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Thank you so much. This is exactly what I wanted :-)

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Answer by MattF
on 25 Aug 2017
Edited by MattF
on 25 Aug 2017

Hi!
I was also using columnlegend which is a great tool. However, I found myself another solution that might be useful to somebody and I will give you a short example here for a two rows legend:
Let's say you define your plots as array like this
h(i) = plot(x,y,<options>);
And your legend as cell
legendInfo = {'item1','item2',...,'itemN'};
Then you can define a legend object as follows
hL1 = legend(h(1:l), legendInfo(1:l), <options>);
hL2 = legend(h(l+1:end), legendInfo(l+1:end), <options>);
where in options you might be willing to set e.g. the orientation as 'horizontal'. Then you can define a position and the units for this
newPosition1 = [a b c d];
newPosition2 = [e f g h];
newUnits = 'normalized';
where actually 'c' and 'd' are the same as 'g' and 'h'. Eventually, you can set your legend as
set(hL1, 'Position', newPosition1, 'Units', newUnits);
set(hL2, 'Position', newPosition2, 'Units', newUnits);

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Answer by Jessica
on 4 Jan 2019

MattF - thanks for offering this alternate solution! I'm using Matlab version 2018a, and it doesn't seem to work for me.
When I create the first legend, hL1 has type matlab.graphics.illustration.Legend. Then when I create hL2, it has the same type, and appears to simply overwrite hL1, even though both stay in my variable space.
I then tried to assign them different locations, but the last-created legend just moves around - the first legend appears to have been over-written. I'm guessing that this is a Matlab version issue, but wanted to know if I was missing something, perhaps in those <options>.

  3 Comments

There is a much simpler solution.
hlegend=legend('one', 'two','three','four');
hlegend.NumColumns=2
It doesn't work for 2017b but works for 2018b with me as :
set(legend, 'NumColumns' ,3)
To avoid first legend object being overwritten, save a copy of figure object just before you create second legend object, example:
hL1 = legend(h(1:l), legendInfo(1:l), <options>);
set(hL1, 'Position', [0.7 0.4 0.1 0.4]);
a=axes('position',get(gca,'position'),'visible','off');
hL2 = legend(a,h(l+1:end), legendInfo(l+1:end), <options>);
set(hL2, 'Position', [0.78 0.4 0.1 0.4]);
This process can be repeated any number of times to create any number of legend objects. Hope it helps!

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Answer by Camilo Malagon Nieto on 14 Aug 2017

Can some one explain this commands better... because for example the columnlegend gives "Undefined function 'columnlegend' for input arguments of type 'cell'." ????

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Jan
on 14 Aug 2017
This is not a problem of the command, but you did not install in in a folder, which is contained in your Matlab path. See:
help addpath

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