Class GaussianWidthFinder

java.lang.Object
  |
  +--GaussianWidthFinder

class GaussianWidthFinder

extends java.lang.Object

This class will measure the width of a gaussian. The supplied data will first be searched for a maximum, then bisection will be used to find the two "half-height" points. The distance between these two points will be taken to be the width of the gaussian.

No attempt will be made to determine whether the data actually follows a gaussian distribution. If the data contains more than one "turning" point, the results are undefined.

Field Summary

protected double[]

data Local copy of the gaussian data

Constructor Summary

GaussianWidthFinder(double[] data)
Creates a new GaussianWidthFinder, to operate on the specified array of values.

Method Summary

protected int	bisect(int left, int right, double target) Searches the specified interval for a value.
protected int	getMaxIndex() Searches for the index of the largest value
int	getWidth()
int	getWidth(int centre, int rightMost) Returns the width of the gaussian, assuming the centre is known.

Methods inherited from class java.lang.Object

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

Field Detail

data

protected double[] data

Local copy of the gaussian data

Constructor Detail

GaussianWidthFinder

public GaussianWidthFinder(double[] data)

Creates a new GaussianWidthFinder, to operate on the specified array of values.

Method Detail

getWidth

public int getWidth(int centre,
                    int rightMost)

Returns the width of the gaussian, assuming the centre is known.

Parameters:

centre - The centre of the gaussian

rightmost - The highest index for which data[] contains valid data.

Returns:

The width of the guassian, measured in array storage locations

getWidth

public int getWidth()

Returns:

The width of the guassian, measured in array storage locations

getMaxIndex

protected int getMaxIndex()

Searches for the index of the largest value

bisect

protected int bisect(int left,
                     int right,
                     double target)

Searches the specified interval for a value.

Parameters:

left - The index corresponding to the minimum bound

right - The index corresponding to the maximum bound

target - The value to search for