How can the ConstantLine LineWidth property default be set?

Using

set(groot,'defaultConstantLineLineWidth',2)

should set the ConstantLine's LineWidth default property to 2, but it gives the following error:

Error using matlab.ui.Root/set
constantlinelinewidth is an invalid class name

How can this default property be set?

This property would affect the vertical line drawn by xline(), for example:

x=[1:10];
y=x.^2;
plot(x,y);
xline(4);

I am following this resource

[Adam Danz]

I'm guessing that your matlab release is prior to r2018b which is when the constantLine objects were released.

[godruler]

I am using R2018b. The ConstantLine property is displayed when

get()

is used on the axes handle, but for some reason using

set(groot,'defaultConstantLineLineWidth',2)

does not affect this property.

Answer 1

[Adam Danz]

After looking more closely as your code, I realized you're using a property that doesn't exist "defaultConstantLineLineWidth"; nor does "defaultConstantLineWidth".

Perhaps you mean defaultLineLineWidth.

[godruler]

No, this will not affect the line drawn by xline() or yline(). What is odd is that when you run get() on the axes handle you can see the "ConstantLine" type and its associated property "LineWidth". But for some reason this property does not exist when it comes to setting it's default with groot.

[Adam Danz]

That's correct, and an unfortunate inconsistancy. In fact, I'll report this to the tech team and suggest that it's changed in future releases.

Update: Case Number 03967262

To reproduce the inconsistancy, the code below sets the default line width to 6 and produces a line object and constantLine object, both of which have LineWidth properties, but only the line object is affected by the default setting.

set(groot,'defaultLineLineWidth',6)
cla()
plot([1 1],[0,1],'-')
h = xline(0.5);
xlim([0,1.5])

[godruler]

Thank you for looking into this Adam.