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Array.averageBy<'T,^U> Function (F#)

Returns the average of the elements generated by applying the function to each element of the array.

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

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

// Signature:
Array.averageBy : ('T -> ^U) -> 'T [] -> ^U (requires ^U with static member (+) and ^U with static member DivideByInt and ^U with static member Zero)

// Usage:
Array.averageBy projection array

projection

Type: 'T -> ^U

The function to transform the array elements before averaging.

array

Type: 'T []

The input array.

Exception

Condition

ArgumentException

Thrown when array is empty.

The computed average.

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

The following example illustrates the use of Array.averageBy.

let avg2 = Array.averageBy (fun elem -> float elem) [|1 .. 10|]
printfn "%f" avg2

Output

5.500000

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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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