/*
* 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.math.analysis.solvers;
import org.apache.commons.math.MathException;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.analysis.QuinticFunction;
import org.apache.commons.math.analysis.SinFunction;
import junit.framework.TestCase;
/**
* @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
*/
public final class NewtonSolverTest extends TestCase {
@Deprecated
public void testDeprecated() throws MathException {
DifferentiableUnivariateRealFunction f = new SinFunction();
double result;
UnivariateRealSolver solver = new NewtonSolver(f);
result = solver.solve(3, 4);
assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());
result = solver.solve(1, 4);
assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());
assertEquals(result, solver.getResult(), 0);
assertTrue(solver.getIterationCount() > 0);
}
/**
*
*/
public void testSinZero() throws MathException {
DifferentiableUnivariateRealFunction f = new SinFunction();
double result;
UnivariateRealSolver solver = new NewtonSolver();
result = solver.solve(f, 3, 4);
assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());
result = solver.solve(f, 1, 4);
assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());
assertEquals(result, solver.getResult(), 0);
assertTrue(solver.getIterationCount() > 0);
}
/**
*
*/
public void testQuinticZero() throws MathException {
DifferentiableUnivariateRealFunction f = new QuinticFunction();
double result;
UnivariateRealSolver solver = new NewtonSolver();
result = solver.solve(f, -0.2, 0.2);
assertEquals(result, 0, solver.getAbsoluteAccuracy());
result = solver.solve(f, -0.1, 0.3);
assertEquals(result, 0, solver.getAbsoluteAccuracy());
result = solver.solve(f, -0.3, 0.45);
assertEquals(result, 0, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.3, 0.7);
assertEquals(result, 0.5, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.2, 0.6);
assertEquals(result, 0.5, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.05, 0.95);
assertEquals(result, 0.5, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.85, 1.25);
assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.8, 1.2);
assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.85, 1.75);
assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.55, 1.45);
assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
result = solver.solve(f, 0.85, 5);
assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
}
}