org.apache.commons.math.analysis
Class UnivariateRealIntegratorImpl

java.lang.Object
  org.apache.commons.math.analysis.UnivariateRealIntegratorImpl

All Implemented Interfaces:

java.io.Serializable, UnivariateRealIntegrator

Direct Known Subclasses:

RombergIntegrator, SimpsonIntegrator, TrapezoidIntegrator

public abstract class UnivariateRealIntegratorImpl
extends java.lang.Object
implements UnivariateRealIntegrator, java.io.Serializable

Provide a default implementation for several generic functions.

Since:

1.2

Version:

$Revision: 620312 $ $Date: 2008-02-10 12:28:59 -0700 (Sun, 10 Feb 2008) $

See Also:

Serialized Form

Field Summary

protected int	defaultMaximalIterationCount default maximum number of iterations
protected int	defaultMinimalIterationCount default minimum number of iterations
protected double	defaultRelativeAccuracy default maximum relative error
protected UnivariateRealFunction	f the integrand function
protected int	iterationCount the last iteration count
protected int	maximalIterationCount maximum number of iterations
protected int	minimalIterationCount minimum number of iterations
protected double	relativeAccuracy maximum relative error
protected double	result the last computed integral
protected boolean	resultComputed indicates whether an integral has been computed

Constructor Summary

protected

UnivariateRealIntegratorImpl(UnivariateRealFunction f, int defaultMaximalIterationCount) Construct an integrator with given iteration count and accuracy.

Method Summary

protected void	clearResult() Convenience function for implementations.
int	getIterationCount() Access the last iteration count.
int	getMaximalIterationCount() Get the upper limit for the number of iterations.
int	getMinimalIterationCount() Get the lower limit for the number of iterations.
double	getRelativeAccuracy() Get the actual relative accuracy.
double	getResult() Access the last computed integral.
protected boolean	isSequence(double start, double mid, double end) Returns true if the arguments form a (strictly) increasing sequence
void	resetMaximalIterationCount() Reset the upper limit for the number of iterations to the default.
void	resetMinimalIterationCount() Reset the lower limit for the number of iterations to the default.
void	resetRelativeAccuracy() Reset the relative accuracy to the default.
void	setMaximalIterationCount(int count) Set the upper limit for the number of iterations.
void	setMinimalIterationCount(int count) Set the lower limit for the number of iterations.
void	setRelativeAccuracy(double accuracy) Set the relative accuracy.
protected void	setResult(double result, int iterationCount) Convenience function for implementations.
protected void	verifyInterval(double lower, double upper) Verifies that the endpoints specify an interval.
protected void	verifyIterationCount() Verifies that the upper and lower limits of iterations are valid.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.commons.math.analysis.UnivariateRealIntegrator

integrate

Field Detail

relativeAccuracy

protected double relativeAccuracy

maximum relative error

maximalIterationCount

protected int maximalIterationCount

maximum number of iterations

minimalIterationCount

protected int minimalIterationCount

minimum number of iterations

defaultRelativeAccuracy

protected double defaultRelativeAccuracy

default maximum relative error

defaultMaximalIterationCount

protected int defaultMaximalIterationCount

default maximum number of iterations

defaultMinimalIterationCount

protected int defaultMinimalIterationCount

default minimum number of iterations

resultComputed

protected boolean resultComputed

indicates whether an integral has been computed

result

protected double result

the last computed integral

iterationCount

protected int iterationCount

the last iteration count

f

protected UnivariateRealFunction f

the integrand function

Constructor Detail

UnivariateRealIntegratorImpl

protected UnivariateRealIntegratorImpl(UnivariateRealFunction f,
                                       int defaultMaximalIterationCount)
                                throws java.lang.IllegalArgumentException

Construct an integrator with given iteration count and accuracy.

Parameters:

f - the integrand function

defaultMaximalIterationCount - maximum number of iterations

Throws:

java.lang.IllegalArgumentException - if f is null or the iteration limits are not valid

Method Detail

getResult

public double getResult()
                 throws java.lang.IllegalStateException

Access the last computed integral.

Specified by:

getResult in interface UnivariateRealIntegrator

Returns:

the last computed integral

Throws:

java.lang.IllegalStateException - if no integral has been computed

getIterationCount

public int getIterationCount()
                      throws java.lang.IllegalStateException

Access the last iteration count.

Specified by:

getIterationCount in interface UnivariateRealIntegrator

Returns:

the last iteration count

Throws:

java.lang.IllegalStateException - if no integral has been computed

setResult

protected final void setResult(double result,
                               int iterationCount)

Convenience function for implementations.

Parameters:

result - the result to set

iterationCount - the iteration count to set

clearResult

protected final void clearResult()

Convenience function for implementations.

setMaximalIterationCount

public void setMaximalIterationCount(int count)

Set the upper limit for the number of iterations.

Specified by:

setMaximalIterationCount in interface UnivariateRealIntegrator

Parameters:

count - maximum number of iterations

getMaximalIterationCount

public int getMaximalIterationCount()

Get the upper limit for the number of iterations.

Specified by:

getMaximalIterationCount in interface UnivariateRealIntegrator

Returns:

the actual upper limit

resetMaximalIterationCount

public void resetMaximalIterationCount()

Reset the upper limit for the number of iterations to the default.

Specified by:

resetMaximalIterationCount in interface UnivariateRealIntegrator

See Also:

UnivariateRealIntegrator.setMaximalIterationCount(int)

setMinimalIterationCount

public void setMinimalIterationCount(int count)

Set the lower limit for the number of iterations.

Specified by:

setMinimalIterationCount in interface UnivariateRealIntegrator

Parameters:

count - minimum number of iterations

getMinimalIterationCount

public int getMinimalIterationCount()

Get the lower limit for the number of iterations.

Specified by:

getMinimalIterationCount in interface UnivariateRealIntegrator

Returns:

the actual lower limit

resetMinimalIterationCount

public void resetMinimalIterationCount()

Reset the lower limit for the number of iterations to the default.

Specified by:

resetMinimalIterationCount in interface UnivariateRealIntegrator

See Also:

UnivariateRealIntegrator.setMinimalIterationCount(int)

setRelativeAccuracy

public void setRelativeAccuracy(double accuracy)

Set the relative accuracy.

Specified by:

setRelativeAccuracy in interface UnivariateRealIntegrator

Parameters:

accuracy - the relative accuracy

Throws:

java.lang.IllegalArgumentException - if the accuracy can't be achieved by the integrator or is otherwise deemed unreasonable

getRelativeAccuracy

public double getRelativeAccuracy()

Get the actual relative accuracy.

Specified by:

getRelativeAccuracy in interface UnivariateRealIntegrator

Returns:

the accuracy

resetRelativeAccuracy

public void resetRelativeAccuracy()

Reset the relative accuracy to the default.

Specified by:

resetRelativeAccuracy in interface UnivariateRealIntegrator

See Also:

UnivariateRealIntegrator.setRelativeAccuracy(double)

isSequence

protected boolean isSequence(double start,
                             double mid,
                             double end)

Returns true if the arguments form a (strictly) increasing sequence

Parameters:

start - first number

mid - second number

end - third number

Returns:

true if the arguments form an increasing sequence

verifyInterval

protected void verifyInterval(double lower,
                              double upper)
                       throws java.lang.IllegalArgumentException

Verifies that the endpoints specify an interval.

Parameters:

lower - lower endpoint

upper - upper endpoint

Throws:

java.lang.IllegalArgumentException - if not interval

verifyIterationCount

protected void verifyIterationCount()
                             throws java.lang.IllegalArgumentException

Verifies that the upper and lower limits of iterations are valid.

Throws:

java.lang.IllegalArgumentException - if not valid