Question

basically having this:

[
[1;2;3];
[4;5;7];
[8;9;0];
]

I would like to get this (read vertically/ turn 90 degrees):

[
[1;4;8];
[2;5;9];
[3;7;0];
]

anybody knows an easy way of doing this in f# ?

Answer 1

I would do it by converting to arrays –

let arr = input |> List.map (List.toArray) |> List.toArray //a array of arrays
let out = Array2D.create size1 size2 (fun x y -> arr.[y].[x])