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MongoQueryable.StandardDeviationPopulationAsync Method (IMongoQueryable<Nullable<Double>>, CancellationToken)
Computes the population standard deviation of a sequence of values.

Namespace: MongoDB.Driver.Linq
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.4.1
Syntax
public static Task<Nullable<double>> StandardDeviationPopulationAsync(
	this IMongoQueryable<Nullable<double>> source,
	CancellationToken cancellationToken = null
)

Parameters

source
Type: MongoDB.Driver.Linq.IMongoQueryable<Nullable<Double>>
A sequence of values to calculate the population standard deviation of.
cancellationToken (Optional)
Type: System.Threading.CancellationToken
The cancellation token.

Return Value

Type: Task<Nullable<Double>>
The population standard deviation of the sequence of values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IMongoQueryable<Nullable<Double>>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also