Can I display 2 legends while using the plotyy function?

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Brad
Brad 2013-10-1
评论： Cristian JECU 2015-3-17
I've been asked to add a 2nd legend to an existing M-file where the objective is to display altitude and SV IDs using the plotyy function. I'm working with the following code:
% Plot altitude and SV IDs with NER State Time and add title
figure('Name','Altitude and SV IDs','numbertitle','off');
[AX,H1,H2] = plotyy(State_Time, Alt, State_Time, SV_ID, 'plot');
set(AX, 'Fontsize', 16, 'XTickLabel',num2str(get(gca,'XTick')','%d'));
title(Event_Title,'FontSize', 20);
% Define axes properties
axes(AX(1));
ylabel('Altitude (m)','Fontsize', 20,'fontweight','b');
xlabel('UTC (Sec)','Fontsize', 20,'fontweight','b');
axes(AX(2));
ylabel('SV ID','Fontsize', 20,'fontweight','b');
% Set the markers, markersizes, and linestyles
set(H1,'Marker','o','MarkerSize',15);
set(H2,'Marker','+','MarkerSize',15);
set(H2,'LineStyle','none');
% Add first and 2nd legends for data source
legend(Source, 'Location', 'NortheastOutside');
legend('SV_ID', 'Location', 'EastOutside');
I'm new to using the plotyy function and the problem I'm running into is the displaying of both legends simultaneously.
Is the displaying of both legends tied to the plotyy function itself?

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-10-1
legend({Source,'SV_ID'}, 'Location', 'NortheastOutside');
  1 个评论
Brad
Brad 2013-10-1
Azzi, this will definitely place both the SV_ID and Source within a single legend. Is there a way to create separate legends for each of these?

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更多回答（1 个）

Kelly Kearney
Kelly Kearney 2013-10-1
编辑：Kelly Kearney 2013-10-1
You can only create one legend per axis (unless you use an outside function like legendflex), but in this case you already have two axes to work with, so:
[ax, h1, h2] = plotyy(1:10, rand(10,1), 1:10, rand(10,1)+10);
leg1 = legend(ax(1), 'thing1', 'Location', 'NortheastOutside');
leg2 = legend(ax(2), 'thing2', 'Location', 'EastOutside');
set(leg2, 'color', 'white');
  1 个评论
Cristian JECU
Cristian JECU 2015-3-17
This solution puts the legend 1, under the lines of the second axes. Is there a solution to bring the legend 1 of the Axes 1 on top?

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