How to shuffle a “DenseMatrix” in F#

Question

In Matlab we can write the following code to shuffle a matrix:

data = data(:, randperm(size(data,2)));

there is what I write with Math.NET:

Answer 1

With Neural Networks I had to shuffle an array of Matrices and used the following code. Note the base data structure is an array ([]) and each item in the array is a Matrix. This is not shuffling a matrix, but an array. It should give you some idea of how to proceed for your problem.

type Random() = 
    static member Shuffle (a : 'a[]) =
        let rand = new System.Random()
        let swap (a: _[]) x y =
            let tmp = a.[x]
            a.[x] <- a.[y]
            a.[y] <- tmp
        Array.iteri (fun i _ -> swap a i (rand.Next(i, Array.length a))) a

and called it like

Random.Shuffle trainingData

Addendum

Here is the code to convert a byte[] to a DenseMatrix of double

let byteArrayToMatrix (bytes : byte[]) : Matrix =
    let (x : Vector) = Vector.Build.DenseOfArray bytes
    let (y : Vector) = x.Map(fun x -> double x)
    let (z : Matrix) = Matrix.Build.DenseOfRowVectors y
    z