baseCode.math
Class Rank

java.lang.Object
  baseCode.math.Rank

public class Rank

extends java.lang.Object

Calculate rank statistics for arrays.

Copyright (c) 2004

Institution: Columbia University

Version:

$Id: Rank.java,v 1.12 2004/12/24 23:16:10 pavlidis Exp $

Author:

Paul Pavlidis

Constructor Summary

Rank()

Method Summary

static cern.colt.list.IntArrayList	order(cern.colt.list.DoubleArrayList array) Return a permutation which puts the array in sorted order.
static cern.colt.list.IntArrayList	rankTransform(cern.colt.list.DoubleArrayList array) Rank transform an array.
static java.util.Map	rankTransform(java.util.Map m) Rank transform a map, where the values are numerical (java.lang.Double) values we wish to rank.

Methods inherited from class java.lang.Object

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

Constructor Detail

Rank

public Rank()

Method Detail

order

public static cern.colt.list.IntArrayList order(cern.colt.list.DoubleArrayList array)

Return a permutation which puts the array in sorted order. In other words, the values returned indicate the positions of the sorted values in the current array (the lowest value has the lowest rank, but it could be located anywhere in the array).

Parameters:

array -

Returns:

rankTransform

public static cern.colt.list.IntArrayList rankTransform(cern.colt.list.DoubleArrayList array)

Rank transform an array. Ties are not handled specially. The ranks are constructed based on the sort order of the elements. That is, low values get low numbered ranks.

Parameters:

array - DoubleArrayList

Returns:

cern.colt.list.DoubleArrayList

rankTransform

public static java.util.Map rankTransform(java.util.Map m)
                                   throws java.lang.IllegalArgumentException

Rank transform a map, where the values are numerical (java.lang.Double) values we wish to rank. Ties are not handled specially.

Parameters:

m - java.util.Map with keys Objects, values Doubles.

Returns:

A java.util.Map keys=old keys, values=java.lang.Integer rank of the key.

Throws:

java.lang.IllegalArgumentException - if the input Map does not have Double values.