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Java Source Code / Java Documentation » Science » Apache commons math 1.1 » org.apache.commons.math.distribution 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.commons.math.distribution.AbstractDistribution
      org.apache.commons.math.distribution.AbstractContinuousDistribution
         org.apache.commons.math.distribution.ExponentialDistributionImpl

ExponentialDistributionImpl
public class ExponentialDistributionImpl extends AbstractContinuousDistribution implements ExponentialDistribution,Serializable(Code)
The default implementation of ExponentialDistribution .
version:
   $Revision: 355770 $ $Date: 2005-12-10 12:48:57 -0700 (Sat, 10 Dec 2005) $



Constructor Summary
public  ExponentialDistributionImpl(double mean)
     Create a exponential distribution with the given mean.

Method Summary
public  doublecumulativeProbability(double x)
     For this disbution, X, this method returns P(X < x). The implementation of this method is based on:
Parameters:
  x - the value at which the CDF is evaluated.
protected  doublegetDomainLowerBound(double p)
     Access the domain value lower bound, based on p, used to bracket a CDF root.
protected  doublegetDomainUpperBound(double p)
     Access the domain value upper bound, based on p, used to bracket a CDF root.
protected  doublegetInitialDomain(double p)
     Access the initial domain value, based on p, used to bracket a CDF root.
public  doublegetMean()
     Access the mean.
public  doubleinverseCumulativeProbability(double p)
     For this distribution, X, this method returns the critical point x, such that P(X < x) = p.
public  voidsetMean(double mean)
     Modify the mean.


Constructor Detail
ExponentialDistributionImpl
public ExponentialDistributionImpl(double mean)(Code)
Create a exponential distribution with the given mean.
Parameters:
  mean - mean of this distribution.




Method Detail
cumulativeProbability
public double cumulativeProbability(double x) throws MathException(Code)
For this disbution, X, this method returns P(X < x). The implementation of this method is based on:
Parameters:
  x - the value at which the CDF is evaluated. CDF for this distribution.
throws:
  MathException - if the cumulative probability can not becomputed due to convergence or other numerical errors.



getDomainLowerBound
protected double getDomainLowerBound(double p)(Code)
Access the domain value lower bound, based on p, used to bracket a CDF root.
Parameters:
  p - the desired probability for the critical value domain value lower bound, i.e.P(X < lower bound) < p



getDomainUpperBound
protected double getDomainUpperBound(double p)(Code)
Access the domain value upper bound, based on p, used to bracket a CDF root.
Parameters:
  p - the desired probability for the critical value domain value upper bound, i.e.P(X < upper bound) > p



getInitialDomain
protected double getInitialDomain(double p)(Code)
Access the initial domain value, based on p, used to bracket a CDF root.
Parameters:
  p - the desired probability for the critical value initial domain value



getMean
public double getMean()(Code)
Access the mean. the mean.



inverseCumulativeProbability
public double inverseCumulativeProbability(double p) throws MathException(Code)
For this distribution, X, this method returns the critical point x, such that P(X < x) = p.

Returns 0 for p=0 and Double.POSITIVE_INFINITY for p=1.
Parameters:
  p - the desired probability x, such that P(X < x) = p
throws:
  MathException - if the inverse cumulative probability can not becomputed due to convergence or other numerical errors.
throws:
  IllegalArgumentException - if p < 0 or p > 1.




setMean
public void setMean(double mean)(Code)
Modify the mean.
Parameters:
  mean - the new mean.
throws:
  IllegalArgumentException - if mean is not positive.



Methods inherited from org.apache.commons.math.distribution.AbstractContinuousDistribution
abstract protected double getDomainLowerBound(double p)(Code)(Java Doc)
abstract protected double getDomainUpperBound(double p)(Code)(Java Doc)
abstract protected double getInitialDomain(double p)(Code)(Java Doc)
public double inverseCumulativeProbability(double p) throws MathException(Code)(Java Doc)

Methods inherited from org.apache.commons.math.distribution.AbstractDistribution
public double cumulativeProbability(double x0, double x1) throws MathException(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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