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

Question

Alborz Sakhaei 2016-10-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305597-how-to-setup-legend-for-a-figure-with-two-axes-left-and-right

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'} )

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jakub Rysanek 2016-10-4

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305597-how-to-setup-legend-for-a-figure-with-two-axes-left-and-right#answer_237282

在 MATLAB Online 中打开

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 个评论
显示 1更早的评论隐藏 1更早的评论

WANG Jason 2019-3-2

Thanks.

Armando Cerullo 2021-9-30

How would you then move the legend?

请先登录，再进行评论。

Answer 2

KSSV 2016-10-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305597-how-to-setup-legend-for-a-figure-with-two-axes-left-and-right#answer_237213

编辑：KSSV 2016-10-4

在 MATLAB Online 中打开

Try the legend separately:

legend(ax(1) , {'sin','cos'} ) ;
legend(ax(2) , {'one'} ) ;

2 个评论
显示无隐藏无

Alborz Sakhaei 2016-10-4

Thanks. Although it's more favorable to have all legends in one box

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.

请先登录，再进行评论。