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UniformStream.java
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95 lines (76 loc) · 2.5 KB
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/*
* Copyright 1990-2008, Mark Little, University of Newcastle upon Tyne
* and others contributors as indicated
* by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 1990-2008,
*/
package org.javasim.streams;
import java.io.IOException;
/**
* Returns a number drawn from a uniform distribution with the given lower and
* upper bounds.
*/
public class UniformStream extends RandomStream
{
/**
* Create stream with low bound 'l' and high bound 'h'.
*/
public UniformStream(double l, double h)
{
super();
lo = l;
hi = h;
range = hi - lo;
}
/**
* Create stream with low bound 'l' and high bound 'h'. Skip the first
* 'StreamSelect' values before returning numbers from the stream.
*/
public UniformStream(double l, double h, int StreamSelect)
{
super();
lo = l;
hi = h;
range = hi - lo;
for (int i = 0; i < StreamSelect * 1000; i++)
uniform();
}
/**
* Create stream with low bound 'l' and high bound 'h'. Skip the first
* 'StreamSelect' values before returning numbers from the stream. Pass the
* seeds 'MGSeed' and 'LCGSeed' to the base class.
*/
public UniformStream(double l, double h, int StreamSelect, long MGSeed,
long LCGSeed)
{
super(MGSeed, LCGSeed);
lo = l;
hi = h;
range = hi - lo;
for (int i = 0; i < StreamSelect * 1000; i++)
uniform();
}
/**
* @return a number from the stream.
*/
public double getNumber () throws IOException, ArithmeticException
{
return lo + (range * uniform());
}
private double lo;
private double hi;
private double range;
}