Custom Aggregate for double[]

[dcolleoni]

Implement

#r "nuget:morelinq
using static MoreLinq.Extensions.ZipLongestExtension;
public static double[] AggregateDoubleArray(this IEnumerable<IEnumerable> source) => source.Aggregate((x, y) => x.ZipLongest(y, (a, b) => a + b)).ToArray();

in Utils/Extensions NB

Check git hash d615717