Indexing animated lines from array

I would like to store multiple animatedline in one variable.

num_plots = 2;

for i = 1:num_plots
    h(i) = animatedline;
end

makes this possible. However

h(1:num_plots) = animatedline;

does not work (points are concatenated, see code below).

for i = 1:100
    for ih = 1:num_plots
        x = i;
        y = i*ih;
        addpoints(g(ih),x,y)
    end
end

Is there a way to avoid using a for loop?

Answer 1

[Ameer Hamza]

When you initialize an array of MATLAB graphics objects like this

num_plots = 2;
g(1:num_plots) = animatedline;

MATLAB creates a single instance of animatedline and assigns it to all elements. Since animatedline is a handle class, all elements of 'g' point to the same object

>> g(1)==g(2)
ans =
  logical
   1

The workaround is to use a for-loop to initialize so that each element is created independently. For a slightly easier syntax, you can use arrayfun()

num_plots = 2;
g = arrayfun(@(x) animatedline(), 1:num_plots);

for i = 1:100
    for ih = 1:num_plots
        x = i;
        y = i*ih;
        addpoints(g(ih),x,y)
    end
end

[Koen]

Thank you very much for the explanation!