stella.math
Class LinearExtrapolation

java.lang.Object
  stella.math.Extrapolation
      stella.math.LinearExtrapolation

public class LinearExtrapolation
extends Extrapolation

Uses linear extrapolation to predict STELLA-sensor data.

Field Summary

private static int

DEGREE The degree of the extrapolation polynom.

Fields inherited from class stella.math.Extrapolation

extrapolate, sum, yk, yk2sum

Constructor Summary

LinearExtrapolation()
Constructs a new linear extrapolation object.

LinearExtrapolation(double[] data)
Constructs a new linear extrapolation object.

Method Summary

protected Polynom	calcPolynom() Calculates the extrapolating polynom.
double	getChi2() Calculates the discrepancy as the sum of the squared residuals.
protected Polynom	updatePolynom() Updates the extrapolating polynom assuming that not only the data but also the data sums are correct.

Methods inherited from class stella.math.Extrapolation

calcSum, getN, getPolynom, predict, setData, shiftBackward, shiftForward

Methods inherited from class java.lang.Object

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

Field Detail

DEGREE

private static final int DEGREE

The degree of the extrapolation polynom.

See Also:

Constant Field Values

Constructor Detail

LinearExtrapolation

public LinearExtrapolation()

Constructs a new linear extrapolation object. Use Extrapolation.setData(double[]) to set the measurements.

LinearExtrapolation

public LinearExtrapolation(double[] data)

Constructs a new linear extrapolation object. The measurements are immediately set.

Method Detail

calcPolynom

protected Polynom calcPolynom()

Calculates the extrapolating polynom. To calculate the partial sums, the Extrapolation.calcSum(int) method of the abstract parent class is used.

Specified by:

calcPolynom in class Extrapolation

updatePolynom

protected Polynom updatePolynom()

Updates the extrapolating polynom assuming that not only the data but also the data sums are correct. This method can be used if a speed-up calculation of the sums was possible.

Specified by:

updatePolynom in class Extrapolation

getChi2

public double getChi2()

Calculates the discrepancy as the sum of the squared residuals.

Specified by:

getChi2 in class Extrapolation

Returns:

-1. if invalid.