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Seq.average<^T> Function (F#)

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

Returns the average of the elements in the sequence.

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

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


// Signature:
Seq.average : seq<^T> -> ^T (requires ^T with static member (+) and ^T with static member DivideByInt and ^T with static member Zero)

// Usage:
Seq.average source


source Type: seq<^T>

The input sequence.


ArgumentExceptionThrown when the input sequence has zero elements.
ArgumentNullExceptionThrown when the input sequence is null

Return Value

The average.


The elements are averaged using the + operator, DivideByInt method and Zero property associated with the element type.

This function cannot be used directly on a sequence 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.

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.


The following code example shows how to use Seq.average, and also compares Seq.average with Seq.averageBy.

// You can use Seq.average to average elements of a list, array, or sequence.
let average1 = Seq.average [ 1.0 .. 10.0 ]
printfn "Average: %f" average1
// To average a sequence of integers, use Seq.averageBy to convert to float.
let average2 = Seq.averageBy (fun elem -> float elem) (seq { 1 .. 10 })
printfn "Average: %f" average2


Average: 5.500000
Average: 5.500000


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

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Collections.Seq Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

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