using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var _array = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };           

            var _divider = 3;

            var result = _array.Aggregate<int, IEnumerable<IEnumerable<int>>>(new int[][] { new int[] { } }, (acc, val) =>

            acc.Where(z => z.Count() == _divider).Union(new[] { (acc.Where(x => Enumerable.Range(1, _divider - 1).Contains(x.Count())).FirstOrDefault() ?? new int[] { }).Union(new[] { val }) }));
        }
    }
}

var m = new double[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
            var t = 3;
            var result0 = Enumerable.Range(0, m.Count() / t).Select(k=> m.Skip(k * t).Take(t).ToArray());
            var result1 = Enumerable.Range(0, m.Count() / t).Select(k => new double[] { m[k], m[k+1], m[k+2] });