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Mean.java
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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.stats;
import java.io.*;
import java.io.FileNotFoundException;
import java.io.IOException;
public class Mean
{
public Mean()
{
reset();
}
/**
* @param value add to this instance, incrementing the number of samples, the sum, mean, etc.
*/
public void setValue (double value) throws IllegalArgumentException
{
if (value > _Max)
_Max = value;
if (value < _Min)
_Min = value;
_Sum += value;
_Number++;
_Mean = (double) (_Sum / _Number);
}
/**
* Reset the object.
*/
public void reset ()
{
_Max = Float.MIN_VALUE;
_Min = Float.MAX_VALUE;
_Sum = _Mean = 0.0;
_Number = 0;
}
/**
* @return the number of samples.
*/
public int numberOfSamples ()
{
return _Number;
}
/**
* @return the minimum value given.
*/
public double min ()
{
return _Min;
}
/**
* @return the maximum value given.
*/
public double max ()
{
return _Max;
}
/**
* @return the sum of all values.
*/
public double sum ()
{
return _Sum;
}
/**
* @return the mean value.
*/
public double mean ()
{
return _Mean;
}
/**
* Save the state of the histogram to the file named 'fileName'.
*
* @param fileName the file to use.
* @return <code>true</code> if save succeeded, <code>false</code> otherwise.
*/
public boolean saveState (String fileName) throws IOException
{
FileOutputStream f = new FileOutputStream(fileName);
DataOutputStream oFile = new DataOutputStream(f);
boolean res = saveState(oFile);
f.close();
return res;
}
/**
* Save the state of the histogram to the stream 'oFile'.
*
* @param oFile the stream to use.
* @return <code>true</code> if save succeeded, <code>false</code> otherwise.
*/
public boolean saveState (DataOutputStream oFile) throws IOException
{
oFile.writeDouble(_Max);
oFile.writeDouble(_Min);
oFile.writeDouble(_Sum);
oFile.writeDouble(_Mean);
oFile.writeInt(_Number);
return true;
}
/**
* Restore the histogram state from the file 'fileName'.
*
* @param fileName the file to use.
* @return <code>true</code> if the restore succeeded, <code>false</code> otherwise.
*/
public boolean restoreState (String fileName) throws FileNotFoundException,
IOException
{
FileInputStream f = new FileInputStream(fileName);
DataInputStream iFile = new DataInputStream(f);
boolean res = restoreState(iFile);
f.close();
return res;
}
/**
* Restore the histogram state from the stream 'iFile'.
*
* @param iFile the file to use.
* @return <code>true</code> if the restore succeeded, <code>false</code> otherwise.
*/
public boolean restoreState (DataInputStream iFile) throws IOException
{
_Max = iFile.readDouble();
_Min = iFile.readDouble();
_Sum = iFile.readDouble();
_Mean = iFile.readDouble();
_Number = iFile.readInt();
return true;
}
/**
* Print out the statistics compiled on the data given.
*/
public void print ()
{
System.out.println("Number of samples : " + numberOfSamples());
System.out.println("Minimum : " + min());
System.out.println("Maximum : " + max());
System.out.println("Sum : " + sum());
System.out.println("Mean : " + mean());
}
protected double _Max;
protected double _Min;
protected double _Sum;
protected double _Mean;
protected int _Number;
}