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/*
* 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.analysis.solvers;
/**
* Implements the <em>Illinois</em> method for root-finding (approximating
* a zero of a univariate real function). It is a modified
* {@link RegulaFalsiSolver <em>Regula Falsi</em>} method.
*
* <p>Like the <em>Regula Falsi</em> method, convergence is guaranteed by
* maintaining a bracketed solution. The <em>Illinois</em> method however,
* should converge much faster than the original <em>Regula Falsi</em>
* method. Furthermore, this implementation of the <em>Illinois</em> method
* should not suffer from the same implementation issues as the <em>Regula
* Falsi</em> method, which may fail to convergence in certain cases.</p>
*
* <p>The <em>Illinois</em> method assumes that the function is continuous,
* but not necessarily smooth.</p>
*
* <p>Implementation based on the following article: M. Dowell and P. Jarratt,
* <em>A modified regula falsi method for computing the root of an
* equation</em>, BIT Numerical Mathematics, volume 11, number 2,
* pages 168-174, Springer, 1971.</p>
*
* @since 3.0
*/
public class IllinoisSolver extends BaseSecantSolver {
/** Construct a solver with default accuracy (1e-6). */
public IllinoisSolver() {
super(DEFAULT_ABSOLUTE_ACCURACY, Method.ILLINOIS);
}
/**
* Construct a solver.
*
* @param absoluteAccuracy Absolute accuracy.
*/
public IllinoisSolver(final double absoluteAccuracy) {
super(absoluteAccuracy, Method.ILLINOIS);
}
/**
* Construct a solver.
*
* @param relativeAccuracy Relative accuracy.
* @param absoluteAccuracy Absolute accuracy.
*/
public IllinoisSolver(final double relativeAccuracy,
final double absoluteAccuracy) {
super(relativeAccuracy, absoluteAccuracy, Method.ILLINOIS);
}
/**
* Construct a solver.
*
* @param relativeAccuracy Relative accuracy.
* @param absoluteAccuracy Absolute accuracy.
* @param functionValueAccuracy Maximum function value error.
*/
public IllinoisSolver(final double relativeAccuracy,
final double absoluteAccuracy,
final double functionValueAccuracy) {
super(relativeAccuracy, absoluteAccuracy, functionValueAccuracy, Method.PEGASUS);
}
}
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