How can I customize the line width in the figure generated by "plotsigroi"?

I am using "plotsigroi" to plot signal regions based on a signal mask. I am looking for a way to customize the line width of the plots using the command line. How can this be achieved?

Answer 1

[MathWorks Support Team]

Though you cannot customize the line width directly when calling the "plotrigsoi", you can output the axes handle returned by "plotsigroi" and modify the properties of the children. Below is an example that can help you understand how it works:

1. Consider a mask of binary sequences for two categories, "ran" and "dom". Use the sequences to generate a "signalMask" object. Discard regions fewer than 3 samples:

>> rng default
>> sq = randi(2,200,2)-1;
>> m = signalMask(sq,"MinLength",3,"Categories",["ran" "dom"]);

2. Generate a sequence of 200 random numbers. Call "plotsigroi" and store the returned axes handle into "h":

>> x = rand(200,1);
>> h = plotsigroi(m,x);  % output the axes handle

This should plot the result like this:

3. Get the children of "h", which is a "3x1 graphics array" containing three instances of "Line":

>> ls=h.Children

ls = 

  3×1 graphics array:

  Line
  Line
  Line

4. Modify the line width as you desire:

>> ls(1).LineWidth = 0.2;   % line width for the red line
>> ls(2).LineWidth = 2;     % line width for the blue line
>> ls(3).LineWidth = 0.5;   % line width for the black line

And now the plot looks like this: