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

It can be done with Zip and Aggregate. The question is so old that probably Zip was not around at the time. Anyway, here is my version, hoping it will help someone.

List myListOfIntArrays = PopulateListOfArraysOf100Ints();
int[] totals = new int[100];
int[] allArraysSum = myListOfIntArrays.Aggregate(
    totals,
    (arrCumul, arrItem) => arrCumul.Zip(arrItem, (a, b) => a + b))
    .ToArray();