Java mean getMean(ArrayList> lists)

Description

get Mean

License

Apache License

Declaration

static public double[] getMean(ArrayList<ArrayList<Double>> lists) 

Method Source Code

//package com.java2s;
/******************************************************************************
 *  Copyright 2015 by ATOM Project                                   *
 *                                                                            *
 *  Licensed under the Apache License, Version 2.0 (the "License");           *
 *  you may not use this file except in compliance with the License.          *
 *  You may obtain a copy of the License at                                   *
 *                                                                            *
 *    http://www.apache.org/licenses/LICENSE-2.0                              *
 *                                                                            *
 *  Unless required by applicable law or agreed to in writing, software       *
 *  distributed under the License is distributed on an "AS IS" BASIS,         *
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
 *  See the License for the specific language governing permissions and       *
 *  limitations under the License.                                            *
 ******************************************************************************/

import java.util.ArrayList;

public class Main {
    static public double[] getMean(ArrayList<ArrayList<Double>> lists) {
        int numAtts = lists.size();
        assert (numAtts > 0);
        int numInsts = lists.get(0).size();
        assert (numInsts > 0);
        double[] Means = new double[numAtts]; // default values are 0s, so return 0 if no elements inside
        for (int i = 0; i < numAtts; i++) {
            double att1 = 0;
            for (int j = 0; j < numInsts; j++) {
                att1 += lists.get(i).get(j);
            }/*from  ww  w  .  ja va2  s.  com*/
            Means[i] = att1 / numInsts;
        }
        return Means;
    }
}

Related

1. adjustVariance(double[] x, double newVariance, double currentMean)
2. calculateMeanOfArrayListDouble(List dList)
3. getMean(ArrayList beats)
4. getMean(final Integer[] values)
5. getMeanValue(ArrayList values)
6. Mean(ArrayList values)