gov.sns.tools.fit.spline
Class CubicSpline

java.lang.Object
  |
  +--gov.sns.tools.fit.spline.CubicSpline

public class CubicSpline

extends java.lang.Object

Constructor Summary

CubicSpline(CubicSpline sp)
constructor of a new spline from another one

CubicSpline(double[] xx, double[] y)
constructor which takes only the data points

CubicSpline(double[] xx, double[] y, double fp0, double fpn)
constructor which also takes initial and final slope constraints

Method Summary

void	differentiate() Differentiates a spline in place.
double	evaluateAt(double xx) method to return an interpolated result at a given x value
void	integrate() Integrates a spline in place.

Methods inherited from class java.lang.Object

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

Constructor Detail

CubicSpline

public CubicSpline(CubicSpline sp)

constructor of a new spline from another one

CubicSpline

public CubicSpline(double[] xx,
                   double[] y,
                   double fp0,
                   double fpn)

constructor which also takes initial and final slope constraints

Parameters:

xx - - the data X values

fp0 - - the slope at the starting point

fpn - - the slope at the end point

CubicSpline

public CubicSpline(double[] xx,
                   double[] y)

constructor which takes only the data points

Parameters:

xx - - the data X values

Method Detail

evaluateAt

public double evaluateAt(double xx)

method to return an interpolated result at a given x value

Parameters:

xx - - the x value to evaluate the interpolation at

differentiate

public void differentiate()

Differentiates a spline in place. After calling this routine, a calls to evaluateAt() return the derivative.

integrate

public void integrate()

Integrates a spline in place. After calling this routine, a calls to evaluateAt() return the integral. The constant of integration is chosen such that i(0) = 0.0;