How to unfade legend placed on an empty (invisible) plot?
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I am trying to make a figure with three plots, and use the fourth one to place the legend. I set that last plot as invisible but then the legend is also faded. How can I fix that?
Here is the relevant code:
fig = figure();
subplot(1,4,1)
plot(x1(:,[1:15]),'LineWidth',3);
ylim([-0.3 1.2]);
title('X1');
subplot(1,4,2)
plot(x2(:,[1:15]),'LineWidth',3);
ylim([-0.3 1.2]);
title('X2');
subplot(1,4,3)
plot(x3(:,[1:15]),'LineWidth',3);
ylim([-0.3 1.2]);
title('X3');
subplot(1,4,4)
plot(x3(:,[1:15]),'Visible','off');
legend(labels,'FontSize',12,'Location','best');
axis off;
sgtitle('Lines');
set(fig,'Units','normalized','Position',[0 0 3 1.5]);
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Accepted Answer
Voss
on 29 Mar 2024
Instead of making the lines in the last axes invisible, make them all-NaN so they don't show up but the legend stil appears normal.
% made up variables:
x1 = rand(10,15);
x2 = rand(10,15);
x3 = rand(10,15);
labels = "label"+(1:15);
% your code with last plot() modification:
fig = figure();
subplot(1,4,1)
plot(x1(:,1:15),'LineWidth',3);
ylim([-0.3 1.2]);
title('X1');
subplot(1,4,2)
plot(x2(:,1:15),'LineWidth',3);
ylim([-0.3 1.2]);
title('X2');
subplot(1,4,3)
plot(x3(:,1:15),'LineWidth',3);
ylim([-0.3 1.2]);
title('X3');
subplot(1,4,4)
plot(NaN(2,15));
legend(labels,'FontSize',12,'Location','best');
axis off;
sgtitle('Lines');
% set(fig,'Units','normalized','Position',[0 0 3 1.5]);
4 Comments
Voss
on 29 Mar 2024
OK. In that line you want to plot 15 lines (that's what you had originally), but I want them to be all NaNs. If I give plot a vector, then plot will give me one line only, so I need to use a matrix with 15 columns because plot plots one line per column of a matrix. The smallest matrix with 15 columns is 2x15, so that's what NaN(2,15) gives you, a 2x15 matrix of NaNs:
NaN(2,15)
More Answers (1)
Adam Danz
on 29 Mar 2024
With tiledlayout, the placement of the legend and the global title can be part of the layout.
fig = figure();
tcl = tiledlayout(1,4); % <----- used tiledlayout
nexttile() % <----- call nexttile instead of subplot
plot(x1(:,[1:15]),'LineWidth',3);
ylim([-0.3 1.2]);
title('X1');
nexttile() % <----- call nexttile instead of subplot
plot(x2(:,[1:15]),'LineWidth',3);
ylim([-0.3 1.2]);
title('X2');
nexttile() % <----- call nexttile instead of subplot
plot(x3(:,[1:15]),'LineWidth',3);
ylim([-0.3 1.2]);
title('X3');
leg = legend(labels,'FontSize',12,'Location','best');
leg.Layout.Tile = 4 % <----- assign legend to 4th tile location
title(tcl,'Lines'); % <----- Set the title of the entire layout instead of sgtitle
set(fig,'Units','normalized','Position',[0 0 3 1.5]);
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