MATLAB Answers

turning legend off in xline function

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Manisha RANJAN
Manisha RANJAN on 17 Apr 2019
Answered: Linjun He on 22 Feb 2020
How can I turn off legend of xline function being visible on the plot?

  1 Comment

madhan ravi
madhan ravi on 17 Apr 2019
Can you share a picture?, I don’t see any legend.

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Answers (3)

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

Adam Danz
Adam Danz on 19 Apr 2019
You forgot to assign the output
myxline = xline(...)
Also, what does the "Hello" string do? Did you mean this?
xline(10, 'r', 'DisplayName', "Hello")
More importantly, replacing the label and DisplayName with empty strings does not remove that element from the legend.
figure
h = xline(0, 'r', 'DisplayName', 'xline');
h.Label = '';
h.DisplayName = '';
legend() %even if legend is produced before removing label and displayname
190419 100356-Figure 2.jpg
Sean de Wolski
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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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');

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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)

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