CODEWITHSUNDEEP
arraysmatrixrandomocaml
Kevin Lin
Kevin Lin

Reputation: 25

Random Number between 1 and 0 in matrix ocaml

I am trying to build a matrix in OCaml consisting only of 1 and 0. My current code is 

let myArray = Array.make_matrix num num2 (Random.int 2) in 
  print myArray

However this fills the entire array up with only 0 or only 1, and not a combination, is there a way for me to do what i want?

Upvotes: 0

Views: 375

Answers (1)

Jeffrey Scofield
Jeffrey Scofield

Reputation: 66823

Yes, Array.make_matrix fills the matrix with a single value that you supply.

You can write this:

let myArray =
    Array.init num
        (fun _ -> Array.init num2 (fun _ -> Random.int 2))

Here's how it looks:

# let num = 2;;
val num : int = 2
# let num2 = 3;;
val num2 : int = 3
# let myArray =
    Array.init num
        (fun _ -> Array.init num2 (fun _ -> Random.int 2));;  
val myArray : int array array = [|[|0; 1; 0|]; [|1; 1; 0|]|]
#

Update

If you want different numbers each time, you need to initialize the random number generator with a different seed each time. An easy way to do this is:

Random.self_init ()

You can call this once at program startup, and you'll get different random numbers in each run of the program.

Upvotes: 3

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