RandomMultivariateGen.java

/*
 * Class:        RandomMultivariateGen
 * Description:  base class for multidimensional random variate generators
 * 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.randvarmulti;
 
import umontreal.ssj.probdistmulti.ContinuousDistributionMulti;
import umontreal.ssj.rng.RandomStream;
import umontreal.ssj.randvar.RandomVariateGen;

public abstract class RandomMultivariateGen {
   protected int dimension;
   // Careful here: there is also a RandomStream inside gen1. But only one
   // of these two is used in a given class.
   protected RandomStream stream; // stream used to generate random numbers
   protected RandomVariateGen gen1; // 1-dim generator used to generate random variates
// This constructor is needed for subclasses with no associated distribution.
//   protected RandomMultivariateGen() {}

   abstract public void nextPoint(double[] p);

   public void nextArrayOfPoints(double[][] v, int start, int n) {
      if (n <= 0)
         throw new IllegalArgumentException("n must be positive.");
      for (int i = 0; i < n; i++)
         nextPoint(v[start + i]);
   }

   public int getDimension() {
      return dimension;
   }

   public RandomStream getStream() {
      if (null != gen1)
         return gen1.getStream();
      return stream;
   }

   public void setStream(RandomStream stream) {
      if (null != gen1)
         gen1.setStream(stream);
      else
         this.stream = stream;
   }
 
}