LinqExtensions.GroupBy<T, TKey>(Vector<T>, Func<T, TKey>, IEqualityComparer<TKey>) Method

Groups the elements of a vector according to the specified key selector function and key comparer.

Definition

Namespace: Extreme.DataAnalysis.Linq
Assembly: Extreme.Numerics (in Extreme.Numerics.dll) Version: 8.1.23

C#

public static LinqExtensions.Lookup<TKey, T> GroupBy<T, TKey>(
	this Vector<T> vector,
	Func<T, TKey> keySelector,
	IEqualityComparer<TKey> comparer
)

Visual Basic

<ExtensionAttribute>
Public Shared Function GroupBy(Of T, TKey) ( 
	vector As Vector(Of T),
	keySelector As Func(Of T, TKey),
	comparer As IEqualityComparer(Of TKey)
) As LinqExtensions.Lookup(Of TKey, T)

C++/CLI

public:
[ExtensionAttribute]
generic<typename T, typename TKey>
static LinqExtensions.Lookup<TKey, T>^ GroupBy(
	Vector<T>^ vector, 
	Func<T, TKey>^ keySelector, 
	IEqualityComparer<TKey>^ comparer
)

F#

[<ExtensionAttribute>]
static member GroupBy : 
        vector : Vector<'T> * 
        keySelector : Func<'T, 'TKey> * 
        comparer : IEqualityComparer<'TKey> -> LinqExtensions.Lookup<'TKey, 'T>

Parameters

vector Vector<T>: The vector to create a lookup from.
keySelector Func<T, TKey>: A function to extract a key from each element.
comparer IEqualityComparer<TKey>: An object that compares two keys for equality.

Type Parameters

T: The type of the elements of the vector.
TKey: The type of the key returned by the key selector.

Return Value

LinqExtensions.Lookup<TKey, T>
A lookup that contains keys and values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type Vector<T>. 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

Reference

LinqExtensions Class

GroupBy Overload

Extreme.DataAnalysis.Linq Namespace