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2 different legend on the same graph for the same data

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Irad Brandys
Irad Brandys 2024-6-15
评论： Irad Brandys 2024-6-16
I have a code which generates 2 plots with the same y-axes and x-axes values (see attached figures).
how can I plot only one figure but with the two different legends ?
attached below is my first plot code. the second code lines are similar but they create new plot and the new legend.
10x in advance,
Irad
for j=1:dpointsnum
plot(totxdata,totydata1(j,:),'linestyle',getprop(lines,1),...
'Color',getprop(colors,j)); hold on;
end
grid(gca,'minor');
xlabel('n\cdotM','FontName','Arial','FontWeight','bold','FontSize',12);
ylabel('Ductility ratio, \mu', FontSize=12,FontWeight='bold',FontName='Arial');
nLeg = legend(Leg); %adding legend entries to the plot
nLeg.Title.String = {'Scaled distance';'[m/kg^{1/3}]'}; %adding title to the lgened
  1 个评论
Irad Brandys
Irad Brandys 2024-6-16
thank you very much. was very helpful.
And how can I add a title to each one of the legends ?
I tried to use for e.g.
title(leg1,'chk1')
but recieved 'Invalid argument. Type 'help legend' for more information'
Irad

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回答（1 个）

Ganesh
Ganesh 2024-6-15
编辑：Ganesh 2024-6-15
Ran in:
Hi @Irad Brandys,
You can usually have only 1 legend per plot. However, you can use a small workaround to make two overlapping plots, and plot two legends for each of them with different units as you require. Kindly follow the below code demo:
x = linspace(0, 10, 15);
y1 = rand(1, 15) * 10;
y2 = rand(1, 15) * 10;
y3 = rand(1, 15) * 10;
hold on
p = plot(x, y1, 'r', x, y2, 'g', x, y3, 'b'); % 'r' is red, 'g' is green, 'b' is blue
p2 = plot(x, y1, 'r', x, y2, 'g', x, y3, 'b') ;
title('Demo Plot')
xlabel('X axis')
ylabel('Y axis')
hold off
grid off
leg1=legend(p,'Unit1A', 'Unit1B', 'Unit1C','Location','NorthEast');
set(leg1,'FontSize',9);
ah1=axes('position',get(gca,'position'),'visible','off');
leg2=legend(ah1,p2,'Unit2A', 'Unit2B', 'Unit2C','Location','NorthWest');
set(leg2,'FontSize',9);
Though I have put in the "Labels" as a part of the function, you could create a variable for the labels and use it in the function.
The legend fuction has more options you could tweak, which you can find in the following documentation:
https://www.mathworks.com/help/matlab/ref/legend.html
Hope this helps!

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