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

72 vues (au cours des 30 derniers jours)
Alborz Sakhaei
Alborz Sakhaei le 3 Oct 2016
Commenté : Armando Cerullo le 30 Sep 2021
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!
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'} )

Réponse acceptée

Jakub Rysanek
Jakub Rysanek le 4 Oct 2016
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'} );
  3 commentaires
WANG Jason
WANG Jason le 2 Mar 2019
Thanks.
Armando Cerullo
Armando Cerullo le 30 Sep 2021
How would you then move the legend?

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Plus de réponses (1)

KSSV
KSSV le 4 Oct 2016
Modifié(e) : KSSV le 4 Oct 2016
Try the legend separately:
legend(ax(1) , {'sin','cos'} ) ;
legend(ax(2) , {'one'} ) ;
  2 commentaires
Alborz Sakhaei
Alborz Sakhaei le 4 Oct 2016
Thanks. Although it's more favorable to have all legends in one box
Subhamoy Saha
Subhamoy Saha le 25 Déc 2018
Modifié(e) : Subhamoy Saha le 25 Déc 2018
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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