JohnsonSystem.java

/*
 * Class:        JohnsonSystem
 * Description:  Johnson system of distributions
 * Environment:  Java
 * Software:     SSJ
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author       Richard Simard
 * @since        july 2012
 *
 *
 * 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.probdist;

abstract class JohnsonSystem extends ContinuousDistribution {
   protected double gamma;
   protected double delta;
   protected double xi;
   protected double lambda;

   protected JohnsonSystem(double gamma, double delta, double xi, double lambda) {
      setParams0(gamma, delta, xi, lambda);
   }

   public double getGamma() {
      return gamma;
   }

   public double getDelta() {
      return delta;
   }

   public double getXi() {
      return xi;
   }

   public double getLambda() {
      return lambda;
   }

   protected void setParams0(double gamma, double delta, double xi, double lambda) {
      if (lambda <= 0)
         throw new IllegalArgumentException("lambda <= 0");
      if (delta <= 0)
         throw new IllegalArgumentException("delta <= 0");
      this.gamma = gamma;
      this.delta = delta;
      this.xi = xi;
      this.lambda = lambda;
   }

   public double[] getParams() {
      double[] retour = { gamma, delta, xi, lambda };
      return retour;
   }

   public String toString() {
      return getClass().getSimpleName() + " : gamma = " + gamma + ", delta = " + delta + ", xi = " + xi + ", lambda = "
            + lambda;
   }
 
}