Java ByteBuffer Get getVariance(ByteBuffer simulationResults)

Description

get Variance

License

Apache License

Declaration

public static double getVariance(ByteBuffer simulationResults) 

Method Source Code

//package com.java2s;
/*/*from   ww  w  .j av  a 2  s  .  com*/
 * Copyright 2014 the original author or authors.
 *
 * 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.nio.ByteBuffer;

public class Main {
    public static double getVariance(ByteBuffer simulationResults) {
        double mean = getMean(simulationResults);
        double temp = 0.0;
        int size = simulationResults.capacity() / 8;
        simulationResults.rewind();
        for (int i = 0; i < size; i++) {
            double f = simulationResults.getDouble();
            temp += (mean - f) * (mean - f);
        }
        return (temp / size);
    }

    public static double getMean(ByteBuffer simulationResults) {
        double sum = 0.0;
        int size = simulationResults.capacity() / 8;
        simulationResults.rewind();
        for (int i = 0; i < size; i++) {
            double f = simulationResults.getDouble();
            sum += f;
        }
        return (sum / size);
    }
}

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