NMath User's Guide

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25.1 Creating Multivariate Functions (.NET, C#, CSharp, VB, Visual Basic, F#)

A MultiVariableFunction is constructed from a Func<DoubleVector, double>, a delegate that takes a single DoubleVector parameter and returns a double. For example, suppose you wish to encapsulate this function:

Code Example – C# multivariate functions

public double MyFunction( DoubleVector v )

{

     return ( NMathFunctions.Sum( v * v ) );

}

Code Example – VB multivariate functions

Function MyFunction(V As DoubleVector) As Double

  Return (NMathFunctions.Sum(V * V))

End Function

First, create a delegate for the MyFunction() method:

Code Example – C# multivariate functions

var d = new Func<DoubleVector, double>( MyFunction );

Code Example – VB multivariate functions

Dim D As New Func(Of DoubleVector, Double)(AddressOf MyFunction)

Then construct a MultiVariableFunction encapsulating the delegate:

Code Example – C# multivariate functions

var f = new MultiVariableFunction( d );

Code Example – VB multivariate functions

Dim F As New MultiVariableFunction(D)

A Func<DoubleVector, double> is also implicitly converted to a MultiVariableFunction. Thus:

Code Example – C# multivariate functions

MultiVariableFunction f = d;

Code Example – VB multivariate functions

Dim F = D

Class MultiVariableFunction provides a Function property that gets the encapsulated function delegate after construction.

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