de.gsi.math

Class Spline

java.lang.Object

de.gsi.math.Spline

public class Spline
extends Object

class implementing natural cubic splines according to: http://en.wikipedia.org/wiki/Spline_(mathematics)

Author:

rstein

Constructor Summary

Constructors

Constructor and Description
Spline(double[] x, double[] y) default constructor
Spline(double[] x, double[] y, int length, int scrPos)

Method Summary

Modifier and Type	Method and Description
double	getValue(double x) returns the cubic-spline interpolated value at x
void	printCoefficients() Debug out-put of the spline fix-points and coefficients
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Spline

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

default constructor

Parameters:

x - array of horizontal coordinates

y - array of vertical coordinates Both arrays are expected to be sorted. The horizontal array should not contain entries with the same value. The default dimension is derived from the

See Also:

Spline(double[] x, double[] y, int length, int scrPos)

Spline

public Spline(double[] x,
              double[] y,
              int length,
              int scrPos)

Parameters:

x - array of horizontal coordinates

y - array of vertical coordinates

length - length of the data

scrPos - first index of the data Both arrays are expected to be sorted. The horizontal array should not contain entries with the same value. It is implicitly required that: 0 <= srcPos <= srcPos+length < x.length and length > 3

Method Detail

getValue

public double getValue(double x)

returns the cubic-spline interpolated value at x

Parameters:

x - input parameter

Returns:

cubic-spline interpolated value at x

printCoefficients

public void printCoefficients()

Debug out-put of the spline fix-points and coefficients

toString

public String toString()

Overrides:

toString in class Object