Package xal.extension.jels.tools.math

Class MeanFieldPolynomial

java.lang.Object

xal.tools.math.fnc.poly.RealUnivariatePolynomial

xal.extension.jels.tools.math.InverseRealPolynomial

xal.extension.jels.tools.math.MeanFieldPolynomial

All Implemented Interfaces:

IRealFunction, ISmoothRealFunction

public class MeanFieldPolynomial
extends InverseRealPolynomial

Author:

Ivo List, Juan F. Esteban Müller <juanf.estebanmuller@esss.se>

Constructor Summary

Constructors

Constructor	Description
MeanFieldPolynomial(InverseRealPolynomial ttf, InverseRealPolynomial ttfPrime)

Method Summary

Modifier and Type	Method	Description
double	derivativeAt(double dblVal)	Evaluate derivative of the model function for the specified value of the indeterminate.
double	evaluateAt(double dblVal)	Evaluate the model function for the specified value: (x1 + x2(x0/x-1) + x3/2(x0/x-1)^2 + ... + xn/(n-1)!
double	getCoef(int iOrder)	Get the specified coefficient value.

Methods inherited from class xal.extension.jels.tools.math.InverseRealPolynomial

getCoefs, getDegree, plus, setCoefArray, times, toString

Methods inherited from class xal.tools.math.fnc.poly.RealUnivariatePolynomial

derivativeAt, main, plus, times

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface xal.tools.math.fnc.IRealFunction

getDomain

Constructor Details

MeanFieldPolynomial

public MeanFieldPolynomial(InverseRealPolynomial ttf,
 InverseRealPolynomial ttfPrime)

Method Details

evaluateAt

public double evaluateAt(double dblVal)

Description copied from class: InverseRealPolynomial

Evaluate the model function for the specified value: (x1 + x2(x0/x-1) + x3/2(x0/x-1)^2 + ... + xn/(n-1)!(x0/x-1)^(n-1)) / x1 where x0,x1,...,xn are coefficients.

Specified by:

evaluateAt in interface IRealFunction

Overrides:

evaluateAt in class InverseRealPolynomial

Parameters:

dblVal - indeterminate value to evaluate the model function at

Returns:

the value of the function at the given location

derivativeAt

public double derivativeAt(double dblVal)

Description copied from class: InverseRealPolynomial

Evaluate derivative of the model function for the specified value of the indeterminate. If the coefficient vector has not been specified, it return 0. (-x2(x0 x^-2) - x3(x0/x-1)(x0 x^-2) - ... - xn/(n-2)!(x0/x-1)^(n-2)(x0 x^-2)) / x1 where x0,x1,...,xn are coefficients.

Specified by:

derivativeAt in interface ISmoothRealFunction

Overrides:

derivativeAt in class InverseRealPolynomial

Parameters:

dblVal - indeterminate value to evaluate the model function derivative

Returns:

the derivative f'(x) of the function f

getCoef

public double getCoef(int iOrder)

Description copied from class: InverseRealPolynomial

Get the specified coefficient value. If the value of iOrder is larger than the size of the coefficient array then the coefficient is assumed to have value zero.

Overrides:

getCoef in class InverseRealPolynomial

Parameters:

iOrder - index of coefficient

Returns:

coefficient