How to Add Title to Legend ?

I want to add a title to legend, as shown in the picture inside the red circle. How do I do that, knowing that I am using Matlab 2013 ?

I tried several times to implement it, but I did not achieve any results...

This is the code I want to execute....

% Clear workspace.
clear all
% Clear command window.
clc
% Close all windows.
close all

% Compute Min Separation (dpt) two sources when pt1=2 and dx=0.5 and z=30
N = 3:1:20;
dpt1 = [7.75, 5.4, 4.13, 3.35, 2.82, 2.43, 2.14, 1.91, 1.72, 1.57, 1.44, 1.333, 1.24, 1.16, 1.088, 1.025, 0.97, 0.918];

% Compute Min Separation (dpt) two sources when pt1=2 and dx=0.5 and z=50
dpt2 = [12.88, 8.97, 6.884, 5.581, 4.695, 4.05, 3.56, 3.18, 2.87, 2.615, 2.405, 2.222, 2.068, 1.932, 1.815, 1.709, 1.615, 1.532];

% Compute Min Separation (dpt) two sources when pt1=2 and dx=0.5 and z=70
dpt3 = [18.05, 12.55, 9.63, 7.812, 6.57, 5.67, 4.99, 4.453, 4.02, 3.662, 3.363, 3.113, 2.895, 2.705, 2.54, 2.394, 2.263, 2.145];


figure(1);
grid on;
title('Minimum Separation (dpt)');
xlabel('NO. of Antenna');
ylabel('Minimum Separation (dpt)');

hold on;
plot(N, dpt1, 'r');
plot(N, dpt2, 'g');
plot(N, dpt3, 'b');
hold off;

lgd = legend(sprintf('pt1 = %g cm, \\lambda = %g cm, \\Deltax = %g cm, Z = %g cm ', 2, 0.4, 0.5, 30),...
          sprintf('pt1 = %g cm, \\lambda = %g cm, \\Deltax = %g cm, Z = %g cm ', 2, 0.4, 0.5, 50),...
          sprintf('pt1 = %g cm, \\lambda = %g cm, \\Deltax = %g cm, Z = %g cm ', 2, 0.4, 0.5, 70));
  title(lgd,' Min Separation (dpt) ');

[madhan ravi]

https://de.mathworks.com/matlabcentral/answers/324848-setting-a-title-for-a-legend perhaps one of those answers in the link if not simply use MATLAB Online for latest version

[Walter Roberson]

Note that 2013 was before the graphics upgrade of R2014b. At the time, legend() worked differently.

[Walter Roberson]

Note that the stuff about NodeChildren mentioned in some of those responses, did not exist at all in 2013.

Possibly the legendflex contribution might help.

[Muhammad Salem]

I have updated the question above. Please review it again.

The problem has not been solved yet. I have tried many codes, but they do not work and I do not know the cause of the problem ?!!

[Muhammad Salem]

I didn't understand you well, can you explain more?

[Walter Roberson]

You indicated you are using a 2013 release of MATLAB.

In fall of 2014, a major upgrade of the MATLAB graphics system was released.

In the time since then, the internal implementation of legend() has changed a lot. The discussions at the link that @madhan ravi posted are mostly irrelevant for you, as they mostly talk about the internal implementation after 2014. But possibly the legendflex() File Exchange contribution might work for you.

[madhan ravi]

Thanks sir Walter, didn’t know about the NodeChildren.

[Muhammad Salem]

@Walter Roberson

@madhan ravi

Thank you very much for your efforts.

Answer 1

[Steven Lord]

You're using a release of MATLAB that's more than ten years old. MATLAB has changed quite a bit during that decade, including a major series of changes to the Handle Graphics functionality in release R2014b. The legend function had its behavior change significantly with that series of changes if I recall correctly.

The following code worked for me in release R2013a. It does not look the same in that release as it does in newer releases (as I said above, major series of changes) but it did create a title. I don't know if there is a way to achieve the exact same appearance in the release you're using as in newer releases.

plot(1:10)
legh = legend('line y = x');
t = get(legh, 'Title');
set(t, 'String', 'hello')

But I strongly encourage you to consider upgrading to a newer release of MATLAB if it is possible.

[Muhammad Salem]

Can I enter the word hello inside the rectangle because it is outside ?

[Steven Lord]

As I said, I don't know if there is a way to achieve the exact same appearance in the release you're using as in newer releases. The easiest way to get the legend to appear the way it does in more recent releases likely would be to upgrade to a more recent release.

[Muhammad Salem]

Thank you so much.