nl.tudelft.simulation.jstats.distributions
Class DistGamma

java.lang.Object
  extended by nl.tudelft.simulation.jstats.distributions.Dist
      extended by nl.tudelft.simulation.jstats.distributions.DistContinuous
          extended by nl.tudelft.simulation.jstats.distributions.DistGamma
All Implemented Interfaces:
Serializable

public class DistGamma
extends DistContinuous

The Gamma distribution. For more information on this distribution see http://mathworld.wolfram.com/GammaDistribution.html

(c) copyright 2002-2004 Delft University of Technology , the Netherlands.
See for project information www.simulation.tudelft.nl
License of use: Lesser General Public License (LGPL) , no warranty.

Since:
1.2
Version:
$Revision: 1.1 $ $Date: 2007/01/06 13:25:42 $
Author:
Alexander Verbraeck
Peter Jacobs
See Also:
Serialized Form

Field Summary
 
Fields inherited from class nl.tudelft.simulation.jstats.distributions.Dist
stream
 
Constructor Summary
DistGamma(StreamInterface stream, double alpha, double beta)
          constructs a new gamma distribution.
 
Method Summary
 double draw()
          draws the next stream value according to the probability of this this distribution.
 double probDensity(double observation)
          returns the propbability density value of an observation
 String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

DistGamma

public DistGamma(StreamInterface stream,
                 double alpha,
                 double beta)
constructs a new gamma distribution. The gamma distribution represents the time to complete some task, e.g. customer service or machine repair

Parameters:
stream - the numberstream
alpha - is the shape parameter alpha>0
beta - is the scale parameter beta>0
Method Detail

draw

public double draw()
Description copied from class: DistContinuous
draws the next stream value according to the probability of this this distribution.

Specified by:
draw in class DistContinuous
Returns:
the next double value drawn.
See Also:
DistContinuous.draw()

probDensity

public double probDensity(double observation)
Description copied from class: DistContinuous
returns the propbability density value of an observation

Specified by:
probDensity in class DistContinuous
Parameters:
observation - the observation.
Returns:
double the probability density.
See Also:
#probDensity(double)

toString

public String toString()
Overrides:
toString in class Object
See Also:
Object.toString()


Copyright © 2002-2011 Delft University of Technology, the Netherlands. All Rights Reserved.