org.gvsig.vectorediting.lib.prov.editvertex.operation

Class SplineCalculator

java.lang.Object

org.gvsig.vectorediting.lib.prov.editvertex.operation.SplineCalculator

public class SplineCalculator
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
SplineCalculator(double[] y) The constructor calculates the second derivatives of the interpolating function at the tabulated points xi, with xi = (i, y[i]).

Method Summary

Modifier and Type	Method and Description
double	fn(int n, double t) Returns a cubic-spline interpolated value y for the point between point (n, y[n]) and (n+1, y[n+1), with t ranging from 0 for (n, y[n]) to 1 for (n+1, y[n+1]).

Methods inherited from class java.lang.Object

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

Constructor Detail

SplineCalculator

public SplineCalculator(double[] y)

The constructor calculates the second derivatives of the interpolating function at the tabulated points xi, with xi = (i, y[i]). Based on numerical recipes in C, http://www.library.cornell.edu/nr/bookcpdf/c3-3.pdf .

Parameters:

y - Array of y coordinates for cubic-spline interpolation.

Method Detail

fn

public double fn(int n,
                 double t)

Returns a cubic-spline interpolated value y for the point between point (n, y[n]) and (n+1, y[n+1), with t ranging from 0 for (n, y[n]) to 1 for (n+1, y[n+1]).

Parameters:

n - The start point.

t - The distance to the next point (0..1).

Returns:

A cubic-spline interpolated value.