How do I sum a list<> of arrays

Question

I have a List< int[] > myList, where I know that all the int[] arrays are the same length - for the sake of argument, let us say I have 500 arrays, each is 2048 elements long

Answer 1

I would do it as follows … but this solution might actually be very slow so you might want to run a benchmark before deploying it in performance-critical sections.

var result = xs.Aggregate(
    (a, b) => Enumerable.Range(0, a.Length).Select(i => a[i] + b[i]).ToArray()
);