DiscreteDistributionIntMulti.java

/*
 * Class:        DiscreteDistributionIntMulti
 * Description:  mother class for discrete distributions over the integers
 * 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.probdistmulti;

public abstract class DiscreteDistributionIntMulti {
   protected int dimension;

   public abstract double prob(int[] x);

   public double cdf(int x[]) {
      int is[] = new int[x.length];
      for (int i = 0; i < is.length; i++)
         is[i] = 0;
 
      boolean end = false;
      double sum = 0.0;
      int j;
      while (!end) {
         sum += prob(is);
         is[0]++;
 
         if (is[0] > x[0]) {
            is[0] = 0;
            j = 1;
            while (j < x.length && is[j] == x[j])
               is[j++] = 0;
 
            if (j == x.length)
               end = true;
            else
               is[j]++;
         }
      }
 
      return sum;
   }

   public int getDimension() {
      return dimension;
   }

   public abstract double[] getMean();

   public abstract double[][] getCovariance();

   public abstract double[][] getCorrelation();
 
}