NMathFunctionsFiveParameterLogisticFtn Class

Computes the 5-parameter logistic (5PL) function, using the given vector of function parameters, at the specified point.

Inheritance Hierarchy

SystemObject
CenterSpace.NMath.CoreDoubleParameterizedFunction
CenterSpace.NMath.CoreNMathFunctionsFiveParameterLogisticFtn

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4

Syntax

public class FiveParameterLogisticFtn : DoubleParameterizedFunction

Public Class FiveParameterLogisticFtn
	Inherits DoubleParameterizedFunction

public ref class FiveParameterLogisticFtn : public DoubleParameterizedFunction

type FiveParameterLogisticFtn = 
    class
        inherit DoubleParameterizedFunction
    end

The NMathFunctionsFiveParameterLogisticFtn type exposes the following members.

Constructors

	Name	Description
	NMathFunctionsFiveParameterLogisticFtn	Initializes a new instance of the NMathFunctionsFiveParameterLogisticFtn class

Properties

	Name	Description
	CentralDifferenceDelta	Gets and sets the delta used in the centeral difference method for approximating the gradient with respect to the parameters. (Inherited from DoubleParameterizedFunction)

Methods

	Name	Description
	Clone	Returns a deep copy of the base. Deriving classes must override this method. (Inherited from DoubleParameterizedFunction)
	Evaluate(DoubleVector, Double)	Evaluates the five parameter logistic function for the given parameter values at the given point. (Overrides DoubleParameterizedFunctionEvaluate(DoubleVector, Double))
	Evaluate(DoubleVector, DoubleVector, DoubleVector)	Evaluates the parameterized function for the given parameter values at the given set of points. (Inherited from DoubleParameterizedFunction)
	GradientWithRespectToParams	Method for calculating the gradient with respect to the parameters while keeping x fixed at the specified value. (Overrides DoubleParameterizedFunctionGradientWithRespectToParams(DoubleVector, Double, DoubleVector))

Remarks

5PL is an extension of 4PL with an additional parameter controlling the degree of asymmetry of the curve:

f(x) = p3 + (p0-p3)/(1 + (x/p2)^p1)^p4

, where p0 is the value at 0, p1 is the slope factor, p2 is the mid-range value, p3 is the value at infinity, and p4 is the asymmetry factor.