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Java example source code file (BracketingNthOrderBrentSolverDFP.java)

This example Java source code file (BracketingNthOrderBrentSolverDFP.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

allowedsolution, bracketingnthorderbrentsolverdfp, deprecated, dfp, fieldbracketingnthorderbrentsolver, nobracketingexception, nullargumentexception, numberistoosmallexception, override, realfieldunivariatefunction, univariatedfpfunction

The BracketingNthOrderBrentSolverDFP.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.dfp;


import org.apache.commons.math3.analysis.RealFieldUnivariateFunction;
import org.apache.commons.math3.analysis.solvers.AllowedSolution;
import org.apache.commons.math3.analysis.solvers.FieldBracketingNthOrderBrentSolver;
import org.apache.commons.math3.exception.NoBracketingException;
import org.apache.commons.math3.exception.NullArgumentException;
import org.apache.commons.math3.exception.NumberIsTooSmallException;
import org.apache.commons.math3.util.MathUtils;

/**
 * This class implements a modification of the <a
 * href="http://mathworld.wolfram.com/BrentsMethod.html"> Brent algorithm</a>.
 * <p>
 * The changes with respect to the original Brent algorithm are:
 * <ul>
 *   <li>the returned value is chosen in the current interval according
 *   to user specified {@link AllowedSolution},</li>
 *   <li>the maximal order for the invert polynomial root search is
 *   user-specified instead of being invert quadratic only</li>
 * </ul>
 * </p>
 * The given interval must bracket the root.
 * @deprecated as of 3.6 replaced with {@link FieldBracketingNthOrderBrentSolver}
 */
@Deprecated
public class BracketingNthOrderBrentSolverDFP extends FieldBracketingNthOrderBrentSolver<Dfp> {

    /**
     * Construct a solver.
     *
     * @param relativeAccuracy Relative accuracy.
     * @param absoluteAccuracy Absolute accuracy.
     * @param functionValueAccuracy Function value accuracy.
     * @param maximalOrder maximal order.
     * @exception NumberIsTooSmallException if maximal order is lower than 2
     */
    public BracketingNthOrderBrentSolverDFP(final Dfp relativeAccuracy,
                                            final Dfp absoluteAccuracy,
                                            final Dfp functionValueAccuracy,
                                            final int maximalOrder)
        throws NumberIsTooSmallException {
        super(relativeAccuracy, absoluteAccuracy, functionValueAccuracy, maximalOrder);
    }

    /**
     * Get the absolute accuracy.
     * @return absolute accuracy
     */
    @Override
    public Dfp getAbsoluteAccuracy() {
        return super.getAbsoluteAccuracy();
    }

    /**
     * Get the relative accuracy.
     * @return relative accuracy
     */
    @Override
    public Dfp getRelativeAccuracy() {
        return super.getRelativeAccuracy();
    }

    /**
     * Get the function accuracy.
     * @return function accuracy
     */
    @Override
    public Dfp getFunctionValueAccuracy() {
        return super.getFunctionValueAccuracy();
    }

    /**
     * Solve for a zero 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.
     *
     * @param maxEval Maximum number of evaluations.
     * @param f Function to solve.
     * @param min Lower bound for the interval.
     * @param max Upper bound for the interval.
     * @param allowedSolution The kind of solutions that the root-finding algorithm may
     * accept as solutions.
     * @return a value where the function is zero.
     * @exception NullArgumentException if f is null.
     * @exception NoBracketingException if root cannot be bracketed
     */
    public Dfp solve(final int maxEval, final UnivariateDfpFunction f,
                     final Dfp min, final Dfp max, final AllowedSolution allowedSolution)
        throws NullArgumentException, NoBracketingException {
        return solve(maxEval, f, min, max, min.add(max).divide(2), allowedSolution);
    }

    /**
     * Solve for a zero in the given interval, start at {@code 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.
     *
     * @param maxEval Maximum number of evaluations.
     * @param f Function to solve.
     * @param min Lower bound for the interval.
     * @param max Upper bound for the interval.
     * @param startValue Start value to use.
     * @param allowedSolution The kind of solutions that the root-finding algorithm may
     * accept as solutions.
     * @return a value where the function is zero.
     * @exception NullArgumentException if f is null.
     * @exception NoBracketingException if root cannot be bracketed
     */
    public Dfp solve(final int maxEval, final UnivariateDfpFunction f,
                     final Dfp min, final Dfp max, final Dfp startValue,
                     final AllowedSolution allowedSolution)
        throws NullArgumentException, NoBracketingException {

        // checks
        MathUtils.checkNotNull(f);

        // wrap the function
        RealFieldUnivariateFunction<Dfp> fieldF = new RealFieldUnivariateFunction() {

            /** {@inheritDoc} */
            public Dfp value(final Dfp x) {
                return f.value(x);
            }
        };

        // delegate to general field solver
        return solve(maxEval, fieldF, min, max, startValue, allowedSolution);

    }

}

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