turning legend off in xline function

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Manisha RANJAN
Manisha RANJAN 2019-4-17
评论： Adam Danz 2022-12-19
How can I turn off legend of xline function being visible on the plot?

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回答（3 个）

Linjun He
Linjun He 2020-2-22
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 个评论
Ann-Cathrin Krause
Ann-Cathrin Krause 2022-12-17
I tried
xline(-1,'--r','HandleVisibility','off');
I wish it worked for me but it didnt.
Adam Danz
Adam Danz 2022-12-19
Ran in:
@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 2019-4-17
编辑：Adam Danz 2019-4-23
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 2019-4-19
编辑：Sean de Wolski 2019-4-19
myxline = xline(10,'r',"Hello")
myxline.Label = ""
myxline.DisplayName = ""
Disable the label and/or DisplayName.
  3 个评论
显示 1更早的评论
Sean de Wolski
Sean de Wolski 2019-4-19
编辑：Sean de Wolski 2019-4-19
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 2019-4-19
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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