List.average<^T> Function (F#)
Returns the average of the elements in the list.
Namespace/Module Path: Microsoft.FSharp.Collections.List
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
List.average : ^T list -> ^T (requires ^T with static member (+) and ^T with static member DivideByInt and ^T with static member Zero)
// Usage:
List.average list
Parameters
list
Type: ^T listThe input list.
Exceptions
Exception |
Condition |
|---|---|
Thrown when the list is empty. |
Return Value
The resulting average.
Remarks
This function cannot be used directly on a list of integers since it requires that the type support an exact division operation, which is indicated by the constraint that the element type must support DivideByInt Floating point types support DivideByInt. To compute the average of a list of integers, see the example in List.averageBy.
This function is named Average 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 example illustrates the use of List.average.
// Compute the average of the elements of a list by using List.average.
let avg1 = List.average [0.0; 1.0; 1.0; 2.0]
printfn "%f" avg1
Output
1.000000
Platforms
Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Version Information
F# Runtime
Supported in: 2.0, 4.0
Silverlight
Supported in: 3