Package org.apache.commons.math.analysis.solvers

Class NewtonSolver

java.lang.Object

org.apache.commons.math.ConvergingAlgorithmImpl

org.apache.commons.math.analysis.solvers.UnivariateRealSolverImpl

org.apache.commons.math.analysis.solvers.NewtonSolver

All Implemented Interfaces:

UnivariateRealSolver, ConvergingAlgorithm

public class NewtonSolver
extends UnivariateRealSolverImpl

Implements Newton's Method for finding zeros of real univariate functions.

The function should be continuous but not necessarily smooth.

Constructor Summary

Constructors

Constructor	Description
NewtonSolver()	Deprecated. in 2.2 (to be removed in 3.0).
NewtonSolver(DifferentiableUnivariateRealFunction f)	Deprecated. as of 2.0 the function to solve is passed as an argument to the solve(UnivariateRealFunction, double, double) or UnivariateRealSolver.solve(UnivariateRealFunction, double, double, double) method.

Method Summary

Modifier and Type	Method	Description
double	solve(double min, double max)	Deprecated.
double	solve(double min, double max, double startValue)	Deprecated.
double	solve(int maxEval, UnivariateRealFunction f, double min, double max)	Find a zero near the midpoint of min and max.
double	solve(int maxEval, UnivariateRealFunction f, double min, double max, double startValue)	Find a zero near the value startValue.
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 class org.apache.commons.math.analysis.solvers.UnivariateRealSolverImpl

getFunctionValue, getFunctionValueAccuracy, getResult, resetFunctionValueAccuracy, setFunctionValueAccuracy

Methods inherited from class org.apache.commons.math.ConvergingAlgorithmImpl

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

Methods inherited from class java.lang.Object

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

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

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

Constructor Details

NewtonSolver

@Deprecated
public NewtonSolver(DifferentiableUnivariateRealFunction f)

Deprecated.

as of 2.0 the function to solve is passed as an argument to the solve(UnivariateRealFunction, double, double) or UnivariateRealSolver.solve(UnivariateRealFunction, double, double, double) method.

Construct a solver for the given function.

Parameters:

f - function to solve.

NewtonSolver

@Deprecated
public NewtonSolver()

Deprecated.

in 2.2 (to be removed in 3.0).

Construct a solver.

Method Details

solve

@Deprecated
public double solve(double min,
 double max)
             throws MaxIterationsExceededException,
FunctionEvaluationException

Deprecated.

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:

FunctionEvaluationException - if an error occurs evaluating the function

MaxIterationsExceededException

solve

@Deprecated
public double solve(double min,
 double max,
 double startValue)
             throws MaxIterationsExceededException,
FunctionEvaluationException

Deprecated.

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:

FunctionEvaluationException - if an error occurs evaluating the function

MaxIterationsExceededException

solve

public double solve(int maxEval,
 UnivariateRealFunction f,
 double min,
 double max)
             throws MaxIterationsExceededException,
FunctionEvaluationException

Find a zero near the midpoint of min and max.

Overrides:

solve in class UnivariateRealSolverImpl

Parameters:

maxEval - Maximum number of evaluations.

f - the function to solve

min - the lower bound for the interval

max - the upper bound for the interval

Returns:

the value where the function is zero

Throws:

MaxIterationsExceededException - if the maximum iteration count is exceeded

FunctionEvaluationException - if an error occurs evaluating the function or derivative

IllegalArgumentException - if min is not less than max

solve

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

Deprecated.

in 2.2 (to be removed in 3.0).

Find a zero near the midpoint of min and max.

Parameters:

f - the function to solve

min - the lower bound for the interval

max - the upper bound for the interval

Returns:

the value where the function is zero

Throws:

MaxIterationsExceededException - if the maximum iteration count is exceeded

FunctionEvaluationException - if an error occurs evaluating the function or derivative

IllegalArgumentException - if min is not less than max

solve

public double solve(int maxEval,
 UnivariateRealFunction f,
 double min,
 double max,
 double startValue)
             throws MaxIterationsExceededException,
FunctionEvaluationException

Find a zero near the value startValue.

Overrides:

solve in class UnivariateRealSolverImpl

Parameters:

maxEval - Maximum number of evaluations.

f - the function to solve

min - the lower bound for the interval (ignored).

max - the upper bound for the interval (ignored).

startValue - the start value to use.

Returns:

the value where the function is zero

Throws:

MaxIterationsExceededException - if the maximum iteration count is exceeded

FunctionEvaluationException - if an error occurs evaluating the function or derivative

IllegalArgumentException - if startValue is not between min and max or if function is not a DifferentiableUnivariateRealFunction instance

solve

@Deprecated
public double solve(UnivariateRealFunction f,
 double min,
 double max,
 double startValue)
             throws MaxIterationsExceededException,
FunctionEvaluationException

Deprecated.

in 2.2 (to be removed in 3.0).

Find a zero near the value startValue.

Parameters:

f - the function to solve

min - the lower bound for the interval (ignored).

max - the upper bound for the interval (ignored).

startValue - the start value to use.

Returns:

the value where the function is zero

Throws:

MaxIterationsExceededException - if the maximum iteration count is exceeded

FunctionEvaluationException - if an error occurs evaluating the function or derivative

IllegalArgumentException - if startValue is not between min and max or if function is not a DifferentiableUnivariateRealFunction instance