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How can I add a legend in the end of sublot ( on the bottom of sublot ) ?\

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Rahim Rahim
Rahim Rahim on 23 Apr 2021
Edited: Star Strider on 24 Apr 2021
Hello,
I have a code of subplots, I want to add a legend at the end of sublot like the picture :
This is my code:
x1=[1;2;3]
y1 = [91,25,3];
y2 = [71,22,13];
y3 = [81,22,33];
y4 = [71,12,63];
y5 = [61,42,23];
y6 = [51,21,23];
figure;
subplot(3,2,1);
b1=bar(x1,y1);
ylabel('Cost per Byte (%)');
ylim([0 max(y1)+10]);
title('Aaa');
subplot(3,2,2);
b2=bar(x1,y2);
ylabel('Security (%)');
ylim([0 max(y2)+10]);
title('Second plot');
subplot(3,2,3);
b3=bar(x1,y3);
ylabel('Data rate (kbps)');
ylim([0 max(y3)+10]);
title('Third plot');
subplot(3,2,4);
b4=bar(x1,y4);
ylabel('Delay (ms)');
ylim([0 max(y4)+10]);
title('Fourth plot');
subplot(3,2,5);
b5=bar(x1,y5);
ylabel('Jitter (ms)');
ylim([0 max(y5)+10]);
title('Fifth plot');
subplot(3,2,6);
b6=bar(x1,y6);
ylabel('Loss ratio 10^6 (ms)');
ylim([0 max(y6)+10]);
title('Sixth plot');
legend('peaks');
set(b1,'FaceColor','red');

Answers (2)

Jonas
Jonas on 23 Apr 2021
the asiest way is to use tiledlayout instead of subplot and then setting the legend position to 'south'. if you want or have to use subplot then just use
lg=legend(...)
and set the position property of the lg object to the place where yiu want to see the legend

Star Strider
Star Strider on 23 Apr 2021
@Rahim Rahim — Responding to your Comment to your earlier Question, I took a look at this.
This is the best I can do —
x1=[1;2;3];
y1 = [91,25,3];
y2 = [71,22,13];
y3 = [81,22,33];
y4 = [71,12,63];
y5 = [61,42,23];
y6 = [51,21,23];
figure;
subplot(4,2,1);
b1=bar(x1,y1);
ylabel('Cost per Byte (%)');
ylim([0 max(y1)+10]);
title('Aaa');
subplot(4,2,2);
b2=bar(x1,y2);
ylabel('Security (%)');
ylim([0 max(y2)+10]);
title('Second plot');
subplot(4,2,3);
b3=bar(x1,y3);
ylabel('Data rate (kbps)');
ylim([0 max(y3)+10]);
title('Third plot');
subplot(4,2,4);
b4=bar(x1,y4);
ylabel('Delay (ms)');
ylim([0 max(y4)+10]);
title('Fourth plot');
subplot(4,2,5);
b5=bar(x1,y5);
ylabel('Jitter (ms)');
ylim([0 max(y5)+10]);
title('Fifth plot');
subplot(4,2,6);
b6=bar(x1,y6);
ylabel('Loss ratio 10^6 (ms)');
ylim([0 max(y6)+10]);
title('Sixth plot');
legend('peaks');
set(b1,'FaceColor','red');
subplot(4,2,[7 8])
cm = turbo(3);
hold on
for k = 1:3
hb78(k) = bar(x1(k), 1);
hb78(k).FaceColor = cm(k,:);
% hb78(k).Visible = 'off';
end
hold off
Ax = gca;
pos = Ax.Position;
Ax.Visible = 'off';
lgd = legend(hb78, '1','2','3');
lgd.Position = pos;
lgd.NumColumns = 3;
Note — The bar colours do not change here, unlike in your earlier Question that specifically requested help with that, so I added that in the bar call creating the legend in case you want to add it to the other subplot bar plots. (It would work the same as the ‘barfcn’ function earlier.) Otherwise, there is no reason for the legend specifically, because there is no way to distinguish the individual bars other than by using the xticklabels function (introduced in R2016b) to describe what they are.
.
  2 Comments
Star Strider
Star Strider on 23 Apr 2021
I have no idea what you are asking, so I have no exact idea how to reply.
The ‘pos’ vector is described in the Position property section of the documentation.
To reduce the lateral dimensions while still centring the legend, try this —
Ax = gca;
pos = Ax.Position;
Ax.Visible = 'off';
% Ax.Box = 'off';
lgd = legend(hb78, 'Left','Centre','Right');
lgd.Position = pos+[0.15 0 -0.30 0];
lgd.NumColumns = 3;
Ax.Position = pos+[0.15 0 -0.30 0]; % Must Match New ‘lgd.Position’ Values
Note — The third element must be negative two times the value of the first element in the addition vector, so with ‘x’ here as the desired offset
pos+[x 0 -2*x 0];
Remember to do the same operation for ‘lgd.Position’ and ‘Ax.Position’.
Experiment to get different results.
See Legend Properties for all the available options.
EDIT — (24 Apr at 02:44)
Revised code excerpt.

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