How to change the order of the legend in the Matlab version 2019b?

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Gopinath Karuppannan
评论： Gopinath Karuppannan 2021-10-30
Hi
I am trying to change the order of legends based upon the user needs. Below is the reference figure and codes (for eg.)
plot([1 2],[15,30])
>> hold on;plot([1 2],[5,35]);
>> hold on;plot([1 2],[40 40],'--k');
How to change the order of legend in the attached figure?

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Dave B
Dave B 2021-10-29
编辑：Dave B 2021-10-29
Ran in:
With your existing .fig file, grab the line objects and feed them into legend in whatever order you like:
open('check.fig')
kids=findobj(gca,'type','Line');
legend(kids)
% or legend(kids([2 3 1])) if that's the order you like
% or legend(kids,'abc','def','ghi') if you want to update the labels
For a new plot:
figure
h1=plot([1 2],[15,30],'r','LineWidth',2);
hold on;
h2=plot([1 2],[5,35],'b','LineWidth',2);
h3=plot([1 2],[40 40],'--k','LineWidth',2);
ylim([5 50])
legend([h3 h2 h1],'3','2','1')
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Dave B
Dave B 2021-10-29
Ran in:
You're generally correct in your understanding but everything is upside down from what you described. That's a little confusing. I'd be surprised if that changed since 2019b, so I'm a little puzzled by your graphic above. In any case, you can be unambiguous about it by looking directly at the kids vector (see below) and you can certainly plot every combination (also below).
In general, I expect the first element of the kids vector that I defined above is the last thing plotted, and the last element of the kids vector is the first element plotted.
open('check.fig');
% I'm removing the semicolon so we can see what's in kids
% If you wanted to check these values programatically, you could use
% get(kids,'DisplayName') to get their 'names' or you can get some
% other aspect of them that you'd like to use to guide their order
kids=findobj(gca,'type','Line')
kids =
3×1 Line array: Line (C) Line (B) Line (A)
orig=gca;
Here's a look at all the combinations of orders:
figure;
t = tiledlayout(2,3);
p=perms([1 2 3]);
for i = 1:height(p)
h=copyobj(orig,t);
h.Layout.Tile=i;
kids=findobj(h,'type','Line');
legend(h,kids(p(i,:)));
title(h,sprintf('[%d %d %d]',p(i,:)))
end
Gopinath Karuppannan
Gopinath Karuppannan 2021-10-30
Okay Perfect. Thanks for the explanation. I understood it clearly. i can do further on this one.

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