CODEWITHSUNDEEP
f#math.netmathnet-numerics
professor bigglesworth
professor bigglesworth

Reputation: 570

array concatenation in F#

Are there any analogs to Matlab's horzcat() and vertcat() functions in F#? Because what I'm doing now seems asinine. There is a related question here but it seems pretty dated.

    let arr = Array.init 5 (fun i -> 1.)
    let xMat = DenseMatrix.init l 2 (fun r c -> if c = 0 then 1. else arr.[r])

There is an Array.concat but it seems to work only vertically.

Upvotes: 0

Views: 1287

Answers (1)

Tomas Petricek
Tomas Petricek

Reputation: 243096

As far as I know, there is no built-in function to do this for F# arrays, but in your code you are ultimately working with matrices from Math.NET Numerics and Math.NET has functions to append matrices vertically and horizontally:

let m1 = DenseMatrix.init 5 1 (fun _ _ -> 1.)
let m2 = DenseMatrix.init 5 1 (fun _ _ -> 2.)

DenseMatrix.append [m1; m2] // Append matrices horizontally
DenseMatrix.stack [m1; m2]  // Append matrices vertically

Upvotes: 5

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