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## org.apache.commons.math.analysis.solvers
Class SecantSolver

    java.lang.Object
      org.apache.commons.math.ConvergingAlgorithmImpl
          org.apache.commons.math.analysis.solvers.UnivariateRealSolverImpl
              org.apache.commons.math.analysis.solvers.SecantSolver

All Implemented Interfaces:
  UnivariateRealSolver, ConvergingAlgorithm

    public class SecantSolver

extends UnivariateRealSolverImpl

Implements a modified version of the secant method for approximating a zero of a real univariate function.

The algorithm is modified to maintain bracketing of a root by successive approximations. Because of forced bracketing, convergence may be slower than the unrestricted secant algorithm. However, this implementation should in general outperform the regula falsi method.

The function is assumed to be continuous but not necessarily smooth.

Version:
  $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $

Field Summary

Fields inherited from class org.apache.commons.math.analysis.solvers.UnivariateRealSolverImpl
`defaultFunctionValueAccuracy, f, functionValue, functionValueAccuracy, result, resultComputed`

Fields inherited from class org.apache.commons.math.ConvergingAlgorithmImpl
`absoluteAccuracy, defaultAbsoluteAccuracy, defaultMaximalIterationCount, defaultRelativeAccuracy, iterationCount, maximalIterationCount, relativeAccuracy`

Constructor Summary
`SecantSolver()` Construct a solver.
`SecantSolver(UnivariateRealFunction 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
`double` | `solve(double min, double max)` Deprecated.
`double` | `solve(double min, double max, double initial)` Deprecated.
`double` | `solve(UnivariateRealFunction f, double min, double max)` Find a zero in the given interval.
`double` | `solve(UnivariateRealFunction f, double min, double max, double initial)` Find a zero in the given interval.

Methods inherited from class org.apache.commons.math.analysis.solvers.UnivariateRealSolverImpl
`checkResultComputed, clearResult, getFunctionValue, getFunctionValueAccuracy, getResult, isBracketing, isSequence, resetFunctionValueAccuracy, setFunctionValueAccuracy, setResult, setResult, verifyBracketing, verifyInterval, verifySequence`

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
`clone, equals, finalize, 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 Detail

### SecantSolver

    @Deprecated
    public SecantSolver(UnivariateRealFunction 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.

### SecantSolver

    public SecantSolver()

  Construct a solver.

Method Detail

### solve

    @Deprecated
    public double solve(double min,
                                   double max)
                 throws ConvergenceException,
                        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:
    `ConvergenceException` - if the maximum iteration count is exceeded or the solver detects convergence problems otherwise.
    `FunctionEvaluationException` - if an error occurs evaluating the function

### solve

    @Deprecated
    public double solve(double min,
                                   double max,
                                   double initial)
                 throws ConvergenceException,
                        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.
    `initial` - 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

### solve

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

  Find a zero in the given interval.

  Parameters:
    `f` - the function to solve
    `min` - the lower bound for the interval
    `max` - the upper bound for the interval
    `initial` - the start value to use (ignored)
  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
    `java.lang.IllegalArgumentException` - if min is not less than max or the signs of the values of the function at the endpoints are not opposites

### solve

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

  Find a zero in the given interval.

  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
    `java.lang.IllegalArgumentException` - if min is not less than max or the signs of the values of the function at the endpoints are not opposites

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