net.sf.ij_plugins.math

Class CubicSplineFunction

java.lang.Object

net.sf.ij_plugins.math.PiecewiseFunction

net.sf.ij_plugins.math.CubicSplineFunction

All Implemented Interfaces:

java.lang.Cloneable, IFunction

public class CubicSplineFunction
extends PiecewiseFunction

Cubit spline implementation based on "Numerical Recipes in C", 2nd edition.

Author:

Jarek Sacha

Field Summary

Fields inherited from class net.sf.ij_plugins.math.PiecewiseFunction

xa, ya

Constructor Summary

Constructors

Constructor and Description
CubicSplineFunction(double[] x, double[] y)
CubicSplineFunction(double[] x, double[] y, double derivativeAtFirst, double derivativeAtLast)
CubicSplineFunction(java.awt.geom.Point2D[] controlPoints) Creates neutral spline, assuming that derivatives at first and last control points are 0.
CubicSplineFunction(java.awt.geom.Point2D[] controlPoints, double derivativeAtFirst, double derivativeAtLast) Creates a spline with given values of derivatives at first and the last point.

Method Summary

Methods

Modifier and Type	Method and Description
CubicSplineFunction	clone()
double	evaluate(double x) Return cubic-spline interpolated value of y.
double	getDerivativeAtFirst() Required derivative at the first control point.
double	getDerivativeAtLast() Required derivative at the last control point.

Methods inherited from class net.sf.ij_plugins.math.PiecewiseFunction

evaluate, getControlPoints, sort

Methods inherited from class java.lang.Object

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

Constructor Detail

CubicSplineFunction

public CubicSplineFunction(double[] x,
                   double[] y)

CubicSplineFunction

public CubicSplineFunction(double[] x,
                   double[] y,
                   double derivativeAtFirst,
                   double derivativeAtLast)

CubicSplineFunction

public CubicSplineFunction(java.awt.geom.Point2D[] controlPoints)

Creates neutral spline, assuming that derivatives at first and last control points are 0.

Parameters:

controlPoints - spline control points.

CubicSplineFunction

public CubicSplineFunction(java.awt.geom.Point2D[] controlPoints,
                   double derivativeAtFirst,
                   double derivativeAtLast)

Creates a spline with given values of derivatives at first and the last point.

Parameters:

controlPoints - spline control points.

derivativeAtFirst - derivative at first control point.

derivativeAtLast - derivative at last control point.

Method Detail

getDerivativeAtFirst

public double getDerivativeAtFirst()

Required derivative at the first control point.

Returns:

derivative at the first control point.

getDerivativeAtLast

public double getDerivativeAtLast()

Required derivative at the last control point.

Returns:

derivative at the last control point.

evaluate

public double evaluate(double x)

Return cubic-spline interpolated value of y.

Specified by:

evaluate in interface IFunction

Overrides:

evaluate in class PiecewiseFunction

Parameters:

x - x-coordinate at which to evaluate the interpolation function.

Returns:

interpolated value of y.

clone

public CubicSplineFunction clone()
                          throws java.lang.CloneNotSupportedException

Overrides:

clone in class PiecewiseFunction

Throws:

java.lang.CloneNotSupportedException