Unable to add title to legend

I tried to give a title to the legend on my plot but the error of Error using title (line 27) Incorrect number of input arguments

So I tried using the example given on the Matlab website:

x = -pi:pi/20:pi;
y1 = sin(x);
plot(x,y1)

hold on
y2 = cos(x);
plot(x,y2)
hold off

lgd = legend('sin(x)','cos(x)');
title(lgd,'My Legend Title')

And I got the same error. I would like some help with this.

[KSSV]

I think the title to legend is supported in MATLAB verison 2016. If you are specific about adding title, you can try keeping string at specified position.

pos = get(lgd,'position') ;
text(pos(1)+1.4,pos(2)+0.16,'My Legend Title') ;

there might be other ways.

[Walter Roberson]

legend() does not support title in R2016a or R2016b.

Answer 1

[Walter Roberson]

legends do not have titles. Axes have titles.

[Walter Roberson]

What might be happening is that in versions up to R2014a, legends were implemented as axes, so if you had the legend handle then since it was an axes handle underneath, you could set the title for it. In R2014b and later, legend is a distinct graphics object of its own, not an axes, and title is not one of the properties it has.

[Ayush Mishra]

Yes I agree. I wonder why they have not mentioned that on the MATLAB Page.

[Walter Roberson]

title has never been a supported attribute for legends. Mathworks does not often document changes affecting only what an object could be "hacked" to do -- using undocumented internal implementations has always been "at your own risk".

In any case, see http://blogs.mathworks.com/loren/2014/11/05/matlab-r2014b-graphics-part-3-compatibility-considerations-in-the-new-graphics-system/#cb86cb60-8960-43c9-a57b-ac671e553a9b

Checking further, I find that for legends, you can now use

lgd.Title.String = 'My Legend Title';

so I was wrong about legends not having titles; the official documentation is http://www.mathworks.com/help/matlab/ref/legend-properties.html#property_Title