Java List Median medianAbsValAboveThresh(List vals, double thresh)

Description

Return median of numbers above threshold

License

Open Source License

Declaration

public static double medianAbsValAboveThresh(List vals, double thresh) 

Method Source Code

//package com.java2s;
/*//from  w w  w. j a v  a  2  s .c o m
**    Copyright (C) 2003-2018 Institute for Systems Biology 
**                            Seattle, Washington, USA. 
**
**    This library is free software; you can redistribute it and/or
**    modify it under the terms of the GNU Lesser General Public
**    License as published by the Free Software Foundation; either
**    version 2.1 of the License, or (at your option) any later version.
**
**    This library is distributed in the hope that it will be useful,
**    but WITHOUT ANY WARRANTY; without even the implied warranty of
**    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
**    Lesser General Public License for more details.
**
**    You should have received a copy of the GNU Lesser General Public
**    License along with this library; if not, write to the Free Software
**    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

import java.util.Collections;

import java.util.List;
import java.util.ArrayList;

public class Main {
    /***************************************************************************
    **
    ** Return median of numbers above threshold
    */

    public static double medianAbsValAboveThresh(List vals, double thresh) {
        int num = vals.size();
        ArrayList above = new ArrayList();
        for (int i = 0; i < num; i++) {
            Double valObj = (Double) vals.get(i);
            if (valObj.isNaN()) {
                return (Double.NaN);
            }
            double val = Math.abs(valObj.doubleValue());
            if (val >= thresh) {
                above.add(valObj);
            }
        }
        return (medianAbsVal(above));
    }

    /***************************************************************************
    **
    ** Median absolute value
    */

    public static double medianAbsVal(List vals) {
        if (vals.isEmpty()) {
            return (Double.NaN);
        }
        int num = vals.size();
        ArrayList sorted = new ArrayList();

        for (int i = 0; i < num; i++) {
            Double val0bj = (Double) vals.get(i);
            if (val0bj.isNaN()) {
                return (Double.NaN);
            }
            sorted.add(new Double(Math.abs(val0bj.doubleValue())));
        }
        Collections.sort(sorted);
        int lindex = num / 2;
        if ((num % 2) == 0) {
            Double lower = (Double) sorted.get(lindex - 1);
            Double upper = (Double) sorted.get(lindex);
            return ((lower.doubleValue() + upper.doubleValue()) / 2.0);
        } else {
            Double median = (Double) sorted.get(lindex);
            return (median.doubleValue());
        }
    }
}

Related

1. median(List sortedDataAscendingOrder)
2. median(List list)
3. median(List data)
4. median(List data)
5. medianAbsVal(List vals)
6. medianDouble(List vals)
7. mediane(List liste)