The
transpose function transposes the rows and columns of its
argument.
Laziness
transpose is lazy in its elements
>>> take 1 (transpose ['a' : undefined, 'b' : undefined])
["ab"]
Examples
>>> transpose [[1,2,3],[4,5,6]]
[[1,4],[2,5],[3,6]]
If some of the rows are shorter than the following rows, their
elements are skipped:
>>> transpose [[10,11],[20],[],[30,31,32]]
[[10,20,30],[11,31],[32]]
For this reason the outer list must be finite; otherwise
transpose hangs:
>>> transpose (repeat [])
* Hangs forever *