RandomStart.java

/*
 * Class:        RandomStart
 * Description:  Randomizes a sequence with a random starting point
 * Environment:  Java
 * Software:     SSJ 
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author       
 * @since
 *
 *
 * 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 umontreal.ssj.hups;
 
import umontreal.ssj.rng.RandomStream;
import java.lang.IllegalArgumentException;

public class RandomStart implements PointSetRandomization {
 
   protected RandomStream stream;

   public RandomStart() {
   }

   public RandomStart(RandomStream stream) {
      this.stream = stream;
   }

   public void randomize(PointSet p) {
      if (p instanceof HaltonSequence) {
         double[] x0 = new double[p.getDimension()];
         stream.nextArrayOfDouble(x0, 0, x0.length);
         ((HaltonSequence) p).setStart(x0);
      } else {
         throw new IllegalArgumentException("RandomStart" + " can only randomize a HaltonSequence");
      }
   }

   public void setStream(RandomStream stream) {
      this.stream = stream;
   }

   public RandomStream getStream() {
      return stream;
   }
 
}