FunctionMath.SumIf<T> Method

Computes the sum of an expression evaluated for each member of a collection that meets the specified condition.

Definition

Namespace: Numerics.NET
Assembly: Numerics.NET (in Numerics.NET.dll) Version: 9.0.4

public static double SumIf<T>(
	IEnumerable<T> collection,
	Func<T, bool> predicate,
	Func<T, double> terms
)

Visual Basic

Public Shared Function SumIf(Of T) ( 
	collection As IEnumerable(Of T),
	predicate As Func(Of T, Boolean),
	terms As Func(Of T, Double)
) As Double

C++/CLI

public:
generic<typename T>
static double SumIf(
	IEnumerable<T>^ collection, 
	Func<T, bool>^ predicate, 
	Func<T, double>^ terms
)

static member SumIf : 
        collection : IEnumerable<'T> * 
        predicate : Func<'T, bool> * 
        terms : Func<'T, float> -> float

collection IEnumerable<T>: An enumerable collection of elements of type T.
predicate Func<T, Boolean>: A function that returns true if the element should be included in the sum.
terms Func<T, Double>: A delegate that returns the value of the specified term.

Double
The sum of terms evaluated for each element of collection for which predicate returns true. .

terms is null.