Package org.apache.commons.math.analysis.integration

Interface UnivariateRealIntegrator

All Superinterfaces:

ConvergingAlgorithm

All Known Implementing Classes:

LegendreGaussIntegrator, RombergIntegrator, SimpsonIntegrator, TrapezoidIntegrator, UnivariateRealIntegratorImpl

public interface UnivariateRealIntegrator
extends ConvergingAlgorithm

Interface for univariate real integration algorithms.

Since:

1.2

Method Summary

Modifier and Type	Method	Description
int	getMinimalIterationCount()	Get the lower limit for the number of iterations.
double	getResult()	Get the result of the last run of the integrator.
double	integrate(double min, double max)	Deprecated. replaced by integrate(UnivariateRealFunction, double, double) since 2.0
double	integrate(UnivariateRealFunction f, double min, double max)	Integrate the function in the given interval.
void	resetMinimalIterationCount()	Reset the lower limit for the number of iterations to the default.
void	setMinimalIterationCount(int count)	Set the lower limit for the number of iterations.

Methods inherited from interface org.apache.commons.math.ConvergingAlgorithm

getAbsoluteAccuracy, getIterationCount, getMaximalIterationCount, getRelativeAccuracy, resetAbsoluteAccuracy, resetMaximalIterationCount, resetRelativeAccuracy, setAbsoluteAccuracy, setMaximalIterationCount, setRelativeAccuracy

Method Details

setMinimalIterationCount

void setMinimalIterationCount(int count)

Set the lower limit for the number of iterations.

Minimal iteration is needed to avoid false early convergence, e.g. the sample points happen to be zeroes of the function. Users can use the default value or choose one that they see as appropriate.

A ConvergenceException will be thrown if this number is not met.

Parameters:

count - minimum number of iterations

getMinimalIterationCount

int getMinimalIterationCount()

Get the lower limit for the number of iterations.

Returns:

the actual lower limit

resetMinimalIterationCount

void resetMinimalIterationCount()

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

The default value is supplied by the implementation.

See Also:

• setMinimalIterationCount(int)

integrate

@Deprecated
double integrate(double min,
 double max)
          throws ConvergenceException,
FunctionEvaluationException,
IllegalArgumentException

Deprecated.

replaced by integrate(UnivariateRealFunction, double, double) since 2.0

Integrate the function in the given interval.

Parameters:

min - the lower bound for the interval

max - the upper bound for the interval

Returns:

the value of integral

Throws:

ConvergenceException - if the maximum iteration count is exceeded or the integrator detects convergence problems otherwise

FunctionEvaluationException - if an error occurs evaluating the function

IllegalArgumentException - if min > max or the endpoints do not satisfy the requirements specified by the integrator

integrate

double integrate(UnivariateRealFunction f,
 double min,
 double max)
          throws ConvergenceException,
FunctionEvaluationException,
IllegalArgumentException

Integrate the function in the given interval.

Parameters:

f - the integrand function

min - the lower bound for the interval

max - the upper bound for the interval

Returns:

the value of integral

Throws:

ConvergenceException - if the maximum iteration count is exceeded or the integrator detects convergence problems otherwise

FunctionEvaluationException - if an error occurs evaluating the function

IllegalArgumentException - if min > max or the endpoints do not satisfy the requirements specified by the integrator

getResult

double getResult()
          throws IllegalStateException

Get the result of the last run of the integrator.

Returns:

the last result

Throws:

IllegalStateException - if there is no result available, either because no result was yet computed or the last attempt failed