compute Vector Minus Mean - Java java.lang

Java examples for java.lang:Math Vector

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Description

compute Vector Minus Mean

Demo Code

/*/*from   w  w  w.  ja v a 2 s .c  o m*/
 * Copyright (C) 2014 University of Freiburg.
 *
 * 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.
 */
//package com.java2s;

import java.util.HashMap;

public class Main {
    private static <T> HashMap<T, Double> computeVectorMinusMean(
            HashMap<T, Double> vector) {
        HashMap<T, Double> vectorNew = new HashMap<T, Double>();
        // Get the mean of the given vector
        double mean = computeVectorMean(vector);

        // Produce new vector
        for (T key : vector.keySet()) {
            // Compute new value
            double valueNew = vector.get(key) - mean;

            // Assign new value to the vector
            vectorNew.put(key, valueNew);
        }

        return vectorNew;
    }

    private static <T> double computeVectorMean(HashMap<T, Double> vector) {
        double mean = 0;
        // Compute sum of all contained values
        double sum = 0;
        for (double value : vector.values()) {
            sum += value;
        }

        // Compute mean of vector values
        mean = sum / vector.values().size();
        return mean;
    }
}

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