xal.extension.fit.spline

Class CubicSpline

java.lang.Object

xal.extension.fit.spline.CubicSpline

public class CubicSpline
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
CubicSpline(CubicSpline sp) constructor of a new spline from another one
CubicSpline(double[] xx, double[] y) constructor which takes only the data points fp0 - the slope at the starting point assumed = 0.
CubicSpline(double[] xx, double[] y, double fp0, double fpn) constructor which also takes initial and final slope constraints

Method Summary

Modifier and Type	Method and Description
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

y - - the data Y 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 fp0 - the slope at the starting point assumed = 0. fpn - the slope at the end point assumed = 0.

Parameters:

xx - - the data X values

y - - the data Y 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 If x is outside the parameter rage - set return value = end point

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;