How to setup legend for a figure with two axes (left and right)?

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Alborz Sakhaei
Alborz Sakhaei 2016-10-3
评论： Armando Cerullo 2021-9-30
I have a figure with two axes (left and right). 2 lines on left axis and one line on right axis. I can not get all legends in one box using following code.
PS. I have read previous discussions (links below) on this topic but does not seem to work for me!
Single legend for plot with two axes
Legend problem in a multiple axes graph
x = 0:0.01:10;
y11 = sin(x);
y12 = cos(x);
y2 = ones(1001,1);
figure;
ax(1) = axes('position',[0.1 0.1 0.8 0.8]);
ax(2) = axes('position',[0.1 0.1 0.8 0.8], 'yaxislocation','right','color','none');
line('parent',ax(1),'xdata',x,'ydata',y11,'color','b');
line('parent',ax(1),'xdata',x,'ydata',y12,'color','g');
line('parent',ax(2),'xdata',x,'ydata',y2,'color','r');
legend( [ax(1) ; ax(2)] , {'sin','cos','one'} )

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采纳的回答

Jakub Rysanek
Jakub Rysanek 2016-10-4
You can create the legend using the handles of your line objects:
l1=line('parent',ax(1),'xdata',x,'ydata',y11,'color','b');
l2=line('parent',ax(1),'xdata',x,'ydata',y12,'color','g');
l3=line('parent',ax(2),'xdata',x,'ydata',y2,'color','r');
legend( [l1;l2;l3] , {'sin','cos','one'} );

更多回答（1 个）

KSSV
KSSV 2016-10-4
编辑：KSSV 2016-10-4
Try the legend separately:
legend(ax(1) , {'sin','cos'} ) ;
legend(ax(2) , {'one'} ) ;
  2 个评论
Subhamoy Saha
Subhamoy Saha 2018-12-25
编辑：Subhamoy Saha 2018-12-25
For R2014b that works fine but for R2017a only last legend is showing (i.e., ax(2) legend) ignoring the first one (, i.e. ax(1)). This is really important as I want to set location for these two legend at two different location and so cannot use a single legend command. Please help how to proceed.

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