turning legend off in xline function

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Manisha RANJAN
Manisha RANJAN on 17 Apr 2019
Commented: Adam Danz on 19 Dec 2022
How can I turn off legend of xline function being visible on the plot?
  1 Comment
madhan ravi
madhan ravi on 17 Apr 2019
Edited: madhan ravi on 17 Apr 2019
Can you share a picture?, I don’t see any legend.

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Answers (3)

Linjun He
Linjun He on 22 Feb 2020
You can simply use 'HandleVisibility' as follows:
xline(-1,'--r','HandleVisibility','off');
For those line you want to show the legend, you can use 'DisplayName':
plot(x, y, 'DisplayName', 'This is the legend for this line');
To show the legend:
legend('show');
  2 Comments
Ann-Cathrin Krause
Ann-Cathrin Krause on 17 Dec 2022
I tried
xline(-1,'--r','HandleVisibility','off');
I wish it worked for me but it didnt.
Adam Danz
Adam Danz on 19 Dec 2022
@Ann-Cathrin Krause, I'm interested in seeing the section of code of plotting code where you're assigning xline and a screenshot of your plot showing the xline in the legend. The short demo below shows that constant line objects with HandleVisibility=off prevents the object from appearing in the legend.
figure()
plot(rand(2), '--')
xline(1.5,'HandleVisibility','off') % won't appear in legend
yline(0.5,'DisplayName', 'YLINE')
legend()

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Adam Danz
Adam Danz on 17 Apr 2019
Edited: Adam Danz on 23 Apr 2019
Option 1: Use object handles
Specity which objects should appear in the legend and produce the legend at the end after all plotting is complete.
figure
h1 = plot(rand(1,5), rand(1,5));
hold on
h2 = plot(rand(1,5), rand(1,5));
xline(0.5)
legend([h1, h2], {'first', 'second'})
Option 2: Turn off AutoUpdate
If you need to add stuff to the plot after you've created the legend, turn off AutoUpdate before adding the objects.
figure
h1 = plot(rand(1,5), rand(1,5));
hold on
h2 = plot(rand(1,5), rand(1,5));
legend([h1, h2], {'first', 'second'}, 'AutoUpdate', 'off')
xline(0.5)

Sean de Wolski
Sean de Wolski on 19 Apr 2019
Edited: Sean de Wolski on 19 Apr 2019
myxline = xline(10,'r',"Hello")
myxline.Label = ""
myxline.DisplayName = ""
Disable the label and/or DisplayName.
  3 Comments
Sean de Wolski
Sean de Wolski on 19 Apr 2019
Edited: Sean de Wolski on 19 Apr 2019
I had myxline = in my command history, apparently failed to copy, doh!
Hello would be the label for the xline, was just showing how you might have the label or not.
In order to create the legend without the xline() don't call legend() directly, call it only on the graphics objects you want:
h = plot(1:10)
xline(3)
legend(h, "Hello World")
Adam Danz
Adam Danz on 19 Apr 2019
I see. "Hello" labels the line on the plot. That's a nice feature.
The legend handel suggestion matches the 'option 1' in my answer, too.

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