de.h2b.java.lib.util

Class DataCleaner

java.lang.Object

de.h2b.java.lib.util.DataCleaner

public class DataCleaner
extends Object

Provides static methods to correct and complete entries of a data list.

Author:

h2b

Method Summary

Modifier and Type	Method and Description
static List<Double>	linearInterpolation(List<Double> values) Returns a copy of the original list with all missing values replaced by a linear interpolation of the adjacent list entries.
static List<Double>	zeroesAnnihilation(List<Double> values, double threshold) Returns a copy of the original list with all values considered to be erroneously equal to zero replaced by Double.NaN.

Methods inherited from class java.lang.Object

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

Method Detail

zeroesAnnihilation

public static List<Double> zeroesAnnihilation(List<Double> values,
                                              double threshold)

Returns a copy of the original list with all values considered to be erroneously equal to zero replaced by Double.NaN.

A value is considered to be erroneously equal to zero if on both sides the adjacent list entries have an absolute value greater than or equal to the specified threshold. The adjacent list entry is defined as the next entry that is not equal to Double.NaN.

Parameters:

values -

threshold -

Returns:

the copy or null if the original list is null

linearInterpolation

public static List<Double> linearInterpolation(List<Double> values)

Returns a copy of the original list with all missing values replaced by a linear interpolation of the adjacent list entries. A value is defined as missing if it is equal to Double.NaN.

The boundary conditions are that a value of is assumed before the first element of the list and a value of after the last one.

Parameters:

values -

Returns:

the copy or null if the original list is null