Sum Object Properties: Signal

I create my object using this class:

classdef myClass    
    properties
        signal = [1 1 2 2 3 3];
    end 
end

The I instantiate N object of this class:

N = 1000;
for i = 1:N
    obj(N) = myClass;
end

I would like to sum the 'signal property' of all N object and return a vector with same size of 'signal property' (6 col x 1 row).

Like this:

result_vector = Sum(obj.signal);

The result should be like:

[X X Y Y Z Z]

Is there any optimized way to do this sum operation without using a FOR loop? How can I do that?

Answer 1

[Gabriele Bunkheila]

I agree with the previous suggestion, another close variation being:

sum(vertcat(obj.signal))

If myClass was instead a System object (such as many filters and other signal processing algorithms found in MATLAB toolboxes), then you'd want to use cell arrays instead, via something like the following:

N = 1000;
obj = cell(N,1);
for i = 1:N
    obj{i} = myClass;
end

In that case, I believe the syntax could get a bit more involved so I thought I'd include an example for reference:

sum(cell2mat(cellfun(@(c) c.signal, obj,'UniformOutput',false)))

Thanks,

Gabriele.

[Nycholas Maia]

Brilliant solution Gabriele!

Thank you!