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
Parameters
projection
Type: 'T -> ^UThe function to transform the array elements before averaging.
array
Type: 'T[]The input array.
Exceptions
Exception |
Condition |
|---|---|
Thrown when array is empty. |
Return Value
The computed average.
Remarks
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.
Example
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
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