/*
* MultipleRandomWalkIntegerOperator.java
*
* Copyright (c) 2002-2015 Alexei Drummond, Andrew Rambaut and Marc Suchard
*
* This file is part of BEAST.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* BEAST 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
* of the License, or (at your option) any later version.
*
* BEAST 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 BEAST; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package dr.inference.operators;
import dr.inference.model.Parameter;
import dr.math.MathUtils;
/**
* @author Chieh-Hsi Wu
* Operator that performs independent random walks on k elements in a parameter
*/
public class MultipleRandomWalkIntegerOperator extends RandomWalkIntegerOperator{
private int sampleSize = 1;
public MultipleRandomWalkIntegerOperator(Parameter parameter, int windowSize, int sampleSize, double weight) {
super(parameter,windowSize, weight);
this.sampleSize = sampleSize;
}
public double doOperation() {
int[] shuffledInd = MathUtils.shuffled(parameter.getSize()); // use getSize(), which = getDimension()
int index;
for(int i = 0; i < sampleSize; i++){
index = shuffledInd[i];
int newValue = calculateNewValue(index);
parameter.setValue(index, newValue);
}
return 0.0;
}
}