org.apache.commons.math.analysis.solvers

Interface UnivariateRealSolver

All Superinterfaces:

ConvergingAlgorithm

All Known Implementing Classes:

BisectionSolver, BrentSolver, LaguerreSolver, MullerSolver, NewtonSolver, RiddersSolver, SecantSolver, UnivariateRealSolverImpl

public interface UnivariateRealSolver
extends ConvergingAlgorithm

Interface for (univariate real) rootfinding algorithms.

Implementations will search for only one zero in the given interval.

Method Summary

Modifier and Type	Method and Description
double	getFunctionValue() Get the result of the last run of the solver.
double	getFunctionValueAccuracy() Get the actual function value accuracy.
double	getResult() Get the result of the last run of the solver.
void	resetFunctionValueAccuracy() Reset the actual function accuracy to the default.
void	setFunctionValueAccuracy(double accuracy) Set the function value accuracy.
double	solve(double min, double max) Deprecated. replaced by solve(UnivariateRealFunction, double, double) since 2.0
double	solve(double min, double max, double startValue) Deprecated. replaced by solve(UnivariateRealFunction, double, double, double) since 2.0
double	solve(UnivariateRealFunction f, double min, double max) Deprecated. in 2.2 (to be removed in 3.0).
double	solve(UnivariateRealFunction f, double min, double max, double startValue) Deprecated. in 2.2 (to be removed in 3.0).

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

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

Method Detail

setFunctionValueAccuracy

void setFunctionValueAccuracy(double accuracy)

Set the function value accuracy.

This is used to determine when an evaluated function value or some other value which is used as divisor is zero.

This is a safety guard and it shouldn't be necessary to change this in general.

Parameters:

accuracy - the accuracy.

Throws:

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

getFunctionValueAccuracy

double getFunctionValueAccuracy()

Get the actual function value accuracy.

Returns:

the accuracy

resetFunctionValueAccuracy

void resetFunctionValueAccuracy()

Reset the actual function accuracy to the default. The default value is provided by the solver implementation.

solve

@Deprecated
double solve(double min,
                         double max)
                  throws ConvergenceException,
                         FunctionEvaluationException

Deprecated. replaced by solve(UnivariateRealFunction, double, double) since 2.0

Solve for a zero root in the given interval.

A solver may require that the interval brackets a single zero root. Solvers that do require bracketing should be able to handle the case where one of the endpoints is itself a root.

Parameters:

min - the lower bound for the interval.

max - the upper bound for the interval.

Returns:

a value where the function is zero

Throws:

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

FunctionEvaluationException - if an error occurs evaluating the function

java.lang.IllegalArgumentException - if min > max or the endpoints do not satisfy the requirements specified by the solver

solve

@Deprecated
double solve(UnivariateRealFunction f,
                         double min,
                         double max)
                  throws ConvergenceException,
                         FunctionEvaluationException

Deprecated. in 2.2 (to be removed in 3.0).

Solve for a zero root in the given interval.

A solver may require that the interval brackets a single zero root. Solvers that do require bracketing should be able to handle the case where one of the endpoints is itself a root.

Parameters:

f - the function to solve.

min - the lower bound for the interval.

max - the upper bound for the interval.

Returns:

a value where the function is zero

Throws:

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

FunctionEvaluationException - if an error occurs evaluating the function

java.lang.IllegalArgumentException - if min > max or the endpoints do not satisfy the requirements specified by the solver

Since:

2.0

solve

@Deprecated
double solve(double min,
                         double max,
                         double startValue)
                  throws ConvergenceException,
                         FunctionEvaluationException,
                         java.lang.IllegalArgumentException

Deprecated. replaced by solve(UnivariateRealFunction, double, double, double) since 2.0

Solve for a zero in the given interval, start at startValue.

A solver may require that the interval brackets a single zero root. Solvers that do require bracketing should be able to handle the case where one of the endpoints is itself a root.

Parameters:

min - the lower bound for the interval.

max - the upper bound for the interval.

startValue - the start value to use

Returns:

a value where the function is zero

Throws:

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

FunctionEvaluationException - if an error occurs evaluating the function

java.lang.IllegalArgumentException - if min > max or the arguments do not satisfy the requirements specified by the solver

solve

@Deprecated
double solve(UnivariateRealFunction f,
                         double min,
                         double max,
                         double startValue)
                  throws ConvergenceException,
                         FunctionEvaluationException,
                         java.lang.IllegalArgumentException

Deprecated. in 2.2 (to be removed in 3.0).

Solve for a zero in the given interval, start at startValue.

A solver may require that the interval brackets a single zero root. Solvers that do require bracketing should be able to handle the case where one of the endpoints is itself a root.

Parameters:

f - the function to solve.

min - the lower bound for the interval.

max - the upper bound for the interval.

startValue - the start value to use

Returns:

a value where the function is zero

Throws:

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

FunctionEvaluationException - if an error occurs evaluating the function

java.lang.IllegalArgumentException - if min > max or the arguments do not satisfy the requirements specified by the solver

Since:

2.0

getResult

double getResult()

Get the result of the last run of the solver.

Returns:

the last result.

Throws:

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

getFunctionValue

double getFunctionValue()

Get the result of the last run of the solver.

Returns:

the value of the function at the last result.

Throws:

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