// Two versions of the Transpose operation based on
// ZipList idiom using IEnumerable<T>. One version is written
// directly and the other one uses LINQ syntax with 'join'
#region Transpose from the blog post
static IEnumerable <IEnumerable <T> > Transpose2 <T>(this IEnumerable <IEnumerable <T> > matrix)
{
if (matrix.Count() == 0)
{
return(ZipEnumerable.Return(Enumerable.Empty <T>()));
}
else
{
return
(ZipEnumerable.
Merge(matrix.First(), Transpose(matrix.Skip(1))).
Select(tuple =>
Enumerable.Concat(new[] { tuple.Item1 }, tuple.Item2)));
}
}
