turning legend off in xline function

How can I turn off legend of xline function being visible on the plot?

[madhan ravi]

Can you share a picture?, I don’t see any legend.

Answer 1

[Linjun He]

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');

[Ann-Cathrin Krause]

I tried

xline(-1,'--r','HandleVisibility','off');

I wish it worked for me but it didnt.

[Adam Danz]

@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()

Answer 2

[Adam Danz]

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)

Answer 3

[Sean de Wolski]

myxline = xline(10,'r',"Hello")
myxline.Label = ""
myxline.DisplayName = ""

Disable the label and/or DisplayName.

[Adam Danz]

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

[Sean de Wolski]

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]

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.