2 legends in 1 plot

Question

Steineklopfer 2017-11-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/367161-2-legends-in-1-plot

编辑： Lee Key 2021-3-7

I though about adding 2 legends to my plots. One to display the entries that all plots share, and one that displays the entries that are unique for each plot.

I found a solution with copyobj, ( https://stackoverflow.com/questions/11253887/how-do-i-add-two-legends-to-a-single-plot-in-matlab ) however that only seems to work with Matlab versions older than 2014b or so.

Is there a solution for newer versions as well?

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mounika 2017-11-15

在 MATLAB Online 中打开

I am using R2017b, following worked perfectly fine for me:

%# create some plot with a legend
hAx(1) = axes();
hLine(1) = plot(1:10, 'Parent',hAx(1));
set(hAx(1), 'Box','off')
legend(hLine(1), 'line')
%# copy the axis
hAx(2) = copyobj(hAx(1),gcf);
delete( get(hAx(2),'Children') )            %# delete its children
hLine(2) = plot(sin(1:10), 'Color','r', 'Parent',hAx(2));
set(hAx(2), 'Color','none', 'XTick',[], ...
    'YAxisLocation','right', 'Box','off')   %# make it transparent
legend(hLine(2), {'curve'}, 'Location','NorthWest', 'Color','w')

Steineklopfer 2017-11-15

Hmm... Yeap you are right. It works for me too. Don't know why it didn't work when I found it.

Thanks :D

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Answer 1

Oindri 2017-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/367161-2-legends-in-1-plot#answer_291234

The code works fine on R2016a too. the legends appear on either top corners of the plot, since one is specifically mentioned 'northwest'

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Lee Key 2021-3-7

编辑：Lee Key 2021-3-7

I have same issue. I want to plot two different graphs (Yleft and Y right) on the same time series axis. When I run the code, the seond legend does not appear, only the first one. Any further help?

I used the location (northwest, and northeast, together with 'hold on'. Still I failed to have both legends on the plot.

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