MATLAB: Summing arrays within a cell array.

Question

I've got a cell array which consists of 501 4D arrays, I want to sum all of these together and output a single 4D array. I've tried using sum and plus but get the error saying too many input arguments.

Answer 1

What about a simple loop?

S = 0;
for k = 1:numel(C)
  S = S + C{k};
end

You can check if a vectorized code is faster:

S = sum(cat(5, C{:}), 5);

While it does not have the overhead for the loop, it requires a large temporary array.