UniformInt.java 

/*
 * Copyright (c) 2005, Regents of the University of California
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.  
 *
 * * Neither the name of the University of California, Berkeley nor
 *   the names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior 
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package blog.distrib;

import blog.*;
import java.util.*;
import common.Util;
Uniform distribution over a range of integers. This distribution has two parameters: the lower end of the range and the upper end of the range. The range is inclusive (it includes the upper and lower ends). 


public class UniformInt extends AbstractCondProbDistrib {
Interprets the parameters as a pair of integers (lower, upper) and creates a uniform distribution over the range {lower, ..., upper}. exactly two Integer objects, or if lower > upper

Throws:  IllegalArgumentException if params does not consist of 


    public UniformInt(List params) {
	try {
	    lower = ((Number) params.get(0)).intValue();
	    upper = ((Number) params.get(1)).intValue();
	    if ((lower > upper) || (params.size() > 2)) {
		throw new IllegalArgumentException();
	    }
	} catch (RuntimeException e) {
	    throw new IllegalArgumentException
		("UniformInt CPD expects two integer arguments "
		 + "[lower, upper] with lower <= upper.  Got: " + params);
	}
    }
Returns 1 / (upper - lower + 1) if the given integer is in the range of this distribution, otherwise returns zero. Takes no arguments. value is not an Integer

Throws:  IllegalArgumentException if args is non-empty or 


    public double getProb(List args, Object value) {
	if (!args.isEmpty()) {
	    throw new IllegalArgumentException
		("UniformInt CPD does not take any arguments.");
	}
	if (!(value instanceof Integer)) {
	    throw new IllegalArgumentException
		("UniformInt CPD defines distribution over objects of class "
		 + "Integer, not " + value.getClass() + ".");
	}
	int x = ((Integer) value).intValue();

	if ((x >= lower) && (x <= upper)) {
	    return 1.0 / (upper - lower + 1);
	}
	return 0;
    }
Returns a sample from this distribution.

Throws:  IllegalArgumentException if args is non-empty 


    public Object sampleVal(List args, Type childType) {
	if (!args.isEmpty()) {
	    throw new IllegalArgumentException
		("UniformInt CPD does not take any arguments.");
	}

	// rely on the fact that Util.random() returns a value in [0, 1)
	double x = lower + Math.floor(Util.random() * (upper - lower + 1));
	return new Integer((int) x);
    }

    private int lower;
    private int upper;
}

This file was generated on Tue Jun 08 17:53:48 PDT 2010 from file UniformInt.java
by the ilog.language.tools.Hilite Java tool written by Hassan Aït-Kaci