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Showing content from https://fsharp.github.io/fsharp-core-docs/reference/fsharp-collections-array4dmodule.html below:

Array4D (FSharp.Core) | FSharp.Core

Creates an array whose elements are all initially the given value

length1 : int: The length of the first dimension.
length2 : int: The length of the second dimension.
length3 : int: The length of the third dimension.
length4 : int: The length of the fourth dimension.
initial : 'T: The initial value for each element of the array.

Returns: 'T[,,,]: The created array.

 Array4D.create 2 2 2 2 1

module Array4D from Microsoft.FSharp.Collections

val create: length1: int -> length2: int -> length3: int -> length4: int -> initial: 'T -> 'T array4d

Evaluates to a 2x2x2x2 array with all entries 1

Fetches an element from a 4D array. You can also use the syntax 'array.[index1,index2,index3,index4]'

 let array: float[,,,] = Array4D.zeroCreate 2 3 4 5

 array[0,2,1,3]

Multiple items

val array: float array4d

--------------------

type 'T array = 'T array

Multiple items

val float: value: 'T -> float (requires member op_Explicit)

--------------------

type float = System.Double

--------------------

type float<'Measure> = float

module Array4D from Microsoft.FSharp.Collections

val zeroCreate: length1: int -> length2: int -> length3: int -> length4: int -> 'T array4d

array : 'T[,,,]: The input array.
index1 : int: The index along the first dimension.
index2 : int: The index along the second dimension.
index3 : int: The index along the third dimension.
index4 : int: The index along the fourth dimension.

Returns: 'T: The value at the given index.

 let array = Array4D.zeroCreate 2 3 4 5

 Array4D.get array 0 2 1 3

Multiple items

val array: obj array4d

--------------------

type 'T array = 'T array

module Array4D from Microsoft.FSharp.Collections

val zeroCreate: length1: int -> length2: int -> length3: int -> length4: int -> 'T array4d

val get: array: 'T array4d -> index1: int -> index2: int -> index3: int -> index4: int -> 'T

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

length1 : int: The length of the first dimension.
length2 : int: The length of the second dimension.
length3 : int: The length of the third dimension.
length4 : int: The length of the fourth dimension.
initializer : int -> int -> int -> int -> 'T: The function to create an initial value at each index in the array.

Returns: 'T[,,,]: The created array.

 Array4D.init 2 2 2 2 (fun i j k l -> i*1000+j*100+k*10+l)

module Array4D from Microsoft.FSharp.Collections

val init: length1: int -> length2: int -> length3: int -> length4: int -> initializer: (int -> int -> int -> int -> 'T) -> 'T array4d

val i: int

val j: int

val k: int

val l: int

Evaluates to a 2x2x2x2 array with contents [[[[0; 1]; [10; 11]]; [[100; 101]; [110; 111]]];[[[1000; 1]; [1010; 1011]]; [[1100; 1101]; [1110; 1111]]]]

Returns the length of an array in the first dimension

array : 'T[,,,]: The input array.

Returns: int: The length of the array in the first dimension.

 let array = Array4D.init 2 3 4 5 (fun i j k -> 100*i + 10*j + k)

 array |> Array4D.length1

type 'T array = 'T array

module Array4D from Microsoft.FSharp.Collections

val init: length1: int -> length2: int -> length3: int -> length4: int -> initializer: (int -> int -> int -> int -> 'T) -> 'T array4d

val i: int

val j: int

val k: int

val length1: array: 'T array4d -> int

Evaluates to 2.

Returns the length of an array in the second dimension.

array : 'T[,,,]: The input array.

Returns: int: The length of the array in the second dimension.

 let array = Array4D.init 2 3 4 5 (fun i j k -> 100*i + 10*j + k)

 array |> Array4D.length2

type 'T array = 'T array

module Array4D from Microsoft.FSharp.Collections

val init: length1: int -> length2: int -> length3: int -> length4: int -> initializer: (int -> int -> int -> int -> 'T) -> 'T array4d

val i: int

val j: int

val k: int

val length2: array: 'T array4d -> int

Evaluates to 3.

Returns the length of an array in the third dimension.

array : 'T[,,,]: The input array.

Returns: int: The length of the array in the third dimension.

 let array = Array4D.init 2 3 4 5 (fun i j k -> 100*i + 10*j + k)

 array |> Array4D.length3

type 'T array = 'T array

module Array4D from Microsoft.FSharp.Collections

val init: length1: int -> length2: int -> length3: int -> length4: int -> initializer: (int -> int -> int -> int -> 'T) -> 'T array4d

val i: int

val j: int

val k: int

val length3: array: 'T array4d -> int

Evaluates to 4.

Returns the length of an array in the fourth dimension.

array : 'T[,,,]: The input array.

Returns: int: The length of the array in the fourth dimension.

 let array = Array4D.init 2 3 4 5 (fun i j k -> 100*i + 10*j + k)

 array |> Array4D.length4

type 'T array = 'T array

module Array4D from Microsoft.FSharp.Collections

val init: length1: int -> length2: int -> length3: int -> length4: int -> initializer: (int -> int -> int -> int -> 'T) -> 'T array4d

val i: int

val j: int

val k: int

val length4: array: 'T array4d -> int

Evaluates to 5.

Sets the value of an element in an array. You can also use the syntax 'array.[index1,index2,index3,index4] <- value'.

 let array: float[,,,] = Array4D.zeroCreate 2 3 4 5

 array[0,2,1,3] <- 5.0

Multiple items

val array: float array4d

--------------------

type 'T array = 'T array

Multiple items

val float: value: 'T -> float (requires member op_Explicit)

--------------------

type float = System.Double

--------------------

type float<'Measure> = float

module Array4D from Microsoft.FSharp.Collections

val zeroCreate: length1: int -> length2: int -> length3: int -> length4: int -> 'T array4d

array : 'T[,,,]: The input array.
index1 : int: The index along the first dimension.
index2 : int: The index along the second dimension.
index3 : int: The index along the third dimension.
index4 : int: The index along the fourth dimension.
value : 'T: The value to set.

 let array = Array4D.zeroCreate 2 3 4 5

 Array4D.2et array 0 2 1 3 5.0

Multiple items

val array: obj array4d

--------------------

type 'T array = 'T array

module Array4D from Microsoft.FSharp.Collections

val zeroCreate: length1: int -> length2: int -> length3: int -> length4: int -> 'T array4d

Creates an array where the entries are initially the "default" value.

length1 : int: The length of the first dimension.
length2 : int: The length of the second dimension.
length3 : int: The length of the third dimension.
length4 : int: The length of the fourth dimension.

Returns: 'T[,,,]: The created array.

 let array : float[,,,] = Array4D.zeroCreate 2 3 3 5

Multiple items

val array: float array4d

--------------------

type 'T array = 'T array

Multiple items

val float: value: 'T -> float (requires member op_Explicit)

--------------------

type float = System.Double

--------------------

type float<'Measure> = float

module Array4D from Microsoft.FSharp.Collections

val zeroCreate: length1: int -> length2: int -> length3: int -> length4: int -> 'T array4d

After evaluation array is a 2x3x3x5 array with contents all zero.

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