How to reorder legend entries with plot children

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Enoch23
Enoch23 2019 年 10 月 29 日
回答済み: nt_ba 2022 年 6 月 10 日
Hello,
I have a loop creating some plots and on some of them I would like to change the order of the legend entries. I came across a method on StackOverflow, however, it doens't seem to work.
I tried the example in excaza 's answer without success.
When I type in lh.PlotChildren(neworder) I get
>> lh.PlotChildren(neworder)
ans =
4×1 Line array:
Line (y = 3*x)
Line (y = x)
Line (y = x.^2)
Line (y = 2*x)
which is the correct order. However, when assigning
>> lh.PlotChildren = lh.PlotChildren(neworder)
lh =
Legend (y = x, y = 2*x, y = 3*x, y = x.^2) with properties:
String: {'y = x' 'y = 2*x' 'y = 3*x' 'y = x.^2'}
Location: 'northeast'
Orientation: 'vertical'
FontSize: 9
Position: [0.7274 0.7282 0.1589 0.1726]
Units: 'normalized'
Show all properties
it doesn't work. Everything stays as is.
Am I missing something?
  1 件のコメント
Kyle Marquis
Kyle Marquis 2020 年 9 月 19 日
Also having the same problems, and the solution given by Sebastian Bomberg is not helpful. Did it work for you?Anyone else have a solution?

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回答 (4 件)

Sebastian Bomberg
Sebastian Bomberg 2019 年 10 月 29 日
You can reorder the children of the axes:
ax = gca;
ax.Children = ax.Children(neworder);
  1 件のコメント
Kyle Marquis
Kyle Marquis 2020 年 9 月 19 日
I am having the same issues as Enoch23, and your "solution" has not helped. Are you able to show how this re-orders the legend as asked in the question?

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Kyle Marquis
Kyle Marquis 2020 年 9 月 19 日
編集済み: Kyle Marquis 2020 年 9 月 19 日
I found a solution that can be used to re-order legend entries without messing up the order in which they are plotted on top of each other (But it doesn't involve plot children). I found it from https://matplotlib.org/1.3.1/users/legend_guide.html , and it's really simple, all you need to do is call
legend([p2, p1], ["line 2", "line 1"])
with p1 being the line object created when you plot
p1 = plot(...)
and together with uistack, I am able to change which objects get plotted on top of which, but then reorder the legend so it makes sense. Example
uistack(psave_d,'top') % Brings certain line to front
legend([psave_a, psave_b, psave_g, psave_c, psave_d, psave_e, psave_f, psave_pde], ["k_y=0.000001 W/m/K","k_y=0.0001 W/m/K","k_y=0.001 W/m/K","k_y=0.01 W/m/K","k_y=0.1 W/m/K","k_y=1 W/m/K","k_y=10 W/m/K","Isothermal PDE Numerical Model"])
If anyone needs more detail, I can gladly provide it. Cheers

Kris Govertsen
Kris Govertsen 2021 年 1 月 15 日
This is how I was able to change the order of the legend on a figure with multiple subplots of area plots:
Before:
I want the order of the legend to follow the order of the colors in the area plot
% a is my figure
% If I type
If I type the following into the command window: a.Children... it returns:
% a.Children
%
% ans =
%
% 5×1 graphics array:
%
% Legend (Grid, VRFB error, VRFB Power, VRFB Energy, LIB error, LIB Power, LIB Energy, Solar, Tidal)
% Axes (Tidal RES)
% Axes (Solar PV RES)
% Axes (VRFB Cost)
% Axes (LIB Cost)
So a.Children(1) is my legend!
% Re-order Legend
lbl = a.Children(1).String; % Retrieve legend labels
numlbl = length(lbl); % Determine number of lables
order = sort(1:1:numlbl,'descend'); % Create array of label numbers in descending order
newlbl = lbl(order); % Create new labels in descending order
legend(findobj(a.Children(2),'Type','area'),newlbl) % Set the legend to follow the new labels
hope this helps!

nt_ba
nt_ba 2022 年 6 月 10 日
I found the solution. Worked perfect for me!
So after you open the .fig file, point at the plot (or subplot) you want to make the change on the legends order.
Then,
ax = gca;
ax.Children % Here you will see the order of your legends. Suppose you have 5 different legends
ax.Children = [ax.Children(2) ax.Children(3) ax.Children(1) ax.Children(4) ax.Children(5)]; % Indicatively, this is how to reorder the legends
Don't forget after doing the aforementioned changes to delete the legend in the figure and insert it again.
Cheers!

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