Array2D.init<'T> Function (F#)

Article
04/28/2015

Creates an array given the dimensions and a generator function to compute the elements.

Namespace/Module Path: Microsoft.FSharp.Collections.Array2D

Assembly: FSharp.Core (in FSharp.Core.dll)

// Signature:
Array2D.init : int -> int -> (int -> int -> 'T) -> 'T [,]

// Usage:
Array2D.init length1 length2 initializer

Parameters

length1
Type: int

The length of the first dimension of the array.
length2
Type: int

The length of the second dimension of the array.
initializer
Type: int -> int -> 'T

A function to produce elements of the array given the two indices.

Exceptions

Exception	Condition
ArgumentException	Thrown when either of the lengths is negative.

Return Value

The generated array.

Remarks

This function is named Initialize in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.

Example

The following code demonstrates the use of Array2D.init to create a two-dimensional array.

let arrayOfArrays = [| [| 1.0; 0.0 |]; [|0.0; 1.0 |] |]
let twoDimensionalArray = Array2D.init 2 2 (fun i j -> arrayOfArrays.[i].[j])

Platforms

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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