Unable to add title to legend

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Ayush Mishra
Ayush Mishra 2016-9-22
编辑： Walter Roberson 2016-9-23
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.
  2 个评论
KSSV
KSSV 2016-9-22
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
Walter Roberson 2016-9-22
legend() does not support title in R2016a or R2016b.

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采纳的回答

Walter Roberson
Walter Roberson 2016-9-22
legends do not have titles. Axes have titles.
  3 个评论
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Ayush Mishra
Ayush Mishra 2016-9-23
Yes I agree. I wonder why they have not mentioned that on the MATLAB Page.
Walter Roberson
Walter Roberson 2016-9-23
编辑：Walter Roberson 2016-9-23
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

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