List.averageBy<'T,^U> Function (F#)
Returns the average of the elements generated by applying the function to each element of the list.
Namespace/Module Path: Microsoft.FSharp.Collections.List
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature: List.averageBy : ('T -> ^U) -> 'T list -> ^U (requires ^U with static member (+) and ^U with static member DivideByInt and ^U with static member Zero) // Usage: List.averageBy projection list
Type: 'T -> ^U
The function to transform the list elements into the type to be averaged.
Type: 'T list
The input list.
Thrown when the list is empty.
The resulting average.
This function is named AverageBy in compiled assemblies. If you are accessing the member from a language other than F#, or through reflection, use this name.
The following code example illustrates the use of List.averageBy.
let avg2 = List.averageBy (fun elem -> float elem) [1 .. 10] printfn "%f" avg2
Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Supported in: 2.0, 4.0
Supported in: 3