Figure legend mismatch when using gobjects

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Tairan
Tairan 2023-2-18
编辑： VBBV 2023-2-18
I was trying to assign legends to a series of Line objects in a gobjects array. I expected the legends to be assigned to the 6 thin solid lines. However, they seemed to be assigned to 6 lines with different line width and style (see the code and figure below). I would like to know if I misused gobjects or legend.
My code:
figure;
GObjects = gobjects(18,1);
colors = [blue; orange; yellow; purple; green; sky]; % user-defined colors: [r g b]
for i = 1:6
GObjects(i) = line(0:200,data_normal(:,i+3),'Color',colors(i,:),'UserData',i);
GObjects(i+6) = line(200:400,data_down(:,i+3),'Color',colors(i,:),'LineWidth',1,'LineStyle',':','UserData',i+6);
GObjects(i+12) = line(200:400,data_up(:,i+3),'Color',colors(i,:),'LineWidth',1,'UserData',i+12);
end
legend("r bound","m bound","ns bound","r elong","m elong","free")
% I also tried:
%
% legends = ["r bound","m bound","ns bound","r elong","m elong","free"];
% for i = 1:6
% legend(GObjects(i),legends(i))
% end
My result:

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采纳的回答

VBBV
VBBV 2023-2-18
编辑：VBBV 2023-2-18
Check the answer given by @Steven Lord in the below link
https://in.mathworks.com/matlabcentral/answers/244707-how-to-change-order-of-legends
figure;
GObjects = gobjects(18,1);
colors = [blue; orange; yellow; purple; green; sky]; % user-defined colors: [r g b]
for i = 1:6
GObjects(i) = line(0:200,data_normal(:,i+3),'Color',colors(i,:),'UserData',i);
GObjects(i+6) = line(200:400,data_down(:,i+3),'Color',colors(i,:),'LineWidth',1,'LineStyle',':','UserData',i+6);
GObjects(i+12) = line(200:400,data_up(:,i+3),'Color',colors(i,:),'LineWidth',1,'UserData',i+12);
end
legend(GObjects(:)) % from that answer

更多回答（1 个）

Sulaymon Eshkabilov
Try this syntax:
figure;
GObjects = gobjects(18,1);
L = {"r bound","m bound","ns bound","r elong","m elong","free"};
colors = [blue; orange; yellow; purple; green; sky]; % user-defined colors: [r g b]
for i = 1:6
GObjects(i) = line(0:200,data_normal(:,i+3),'Color',colors(i,:),'UserData',i);
GObjects(i+6) = line(200:400,data_down(:,i+3),'Color',colors(i,:),'LineWidth',1,'LineStyle',':','UserData',i+6);
GObjects(i+12) = line(200:400,data_up(:,i+3),'Color',colors(i,:),'LineWidth',1,'UserData',i+12);
LL{i} = L{i};
legend(LL{:})
end
  1 个评论
Tairan
Tairan 2023-2-18
It doesn't work. The result is the same. The problem seems to relate to the construction order of lines.

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