Re: [Haskell-beginners] Creating a Triple List from a List

Il 27 febbraio 2021 alle 18:07 A. Mc. ha scritto:

Hello,

What is the best way to take: [1, 2, 3, 4 ]

And convert it to:

[ [ [ 1 ], [ 2 ] ], [ [3]. [4] ] ]

so that each member pair is:

[ [1], [2] ]

roughly analogous to a 1x2 vector?

A 1×2 vector would be

[[1 2], [3, 4]]

am I wrong? If so, a quick and dirty solution could be d2 :: [a] -> [[a]] d2 [] = [] d2 [a] = error "odd element" d2 as = let (is, es) = splitAt 2 as in is : d2 es -- λ> d2 [1..6] -- [[1,2],[3,4],[5,6]]