

Java example source code file (NewtonSolverTest.java)
The NewtonSolverTest.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/LICENSE2.0 * * 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; import org.apache.commons.math3.analysis.DifferentiableUnivariateFunction; import org.apache.commons.math3.analysis.QuinticFunction; import org.apache.commons.math3.analysis.UnivariateFunction; import org.apache.commons.math3.analysis.differentiation.DerivativeStructure; import org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction; import org.apache.commons.math3.analysis.function.Sin; import org.apache.commons.math3.util.FastMath; import org.junit.Assert; import org.junit.Test; /** * @deprecated */ @Deprecated public final class NewtonSolverTest { /** * */ @Test public void testSinZero() { DifferentiableUnivariateFunction f = new Sin(); double result; NewtonSolver solver = new NewtonSolver(); result = solver.solve(100, f, 3, 4); Assert.assertEquals(result, FastMath.PI, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 1, 4); Assert.assertEquals(result, FastMath.PI, solver.getAbsoluteAccuracy()); Assert.assertTrue(solver.getEvaluations() > 0); } /** * */ @Test public void testQuinticZero() { final UnivariateDifferentiableFunction q = new QuinticFunction(); DifferentiableUnivariateFunction f = new DifferentiableUnivariateFunction() { public double value(double x) { return q.value(x); } public UnivariateFunction derivative() { return new UnivariateFunction() { public double value(double x) { return q.value(new DerivativeStructure(1, 1, 0, x)).getPartialDerivative(1); } }; } }; double result; NewtonSolver solver = new NewtonSolver(); result = solver.solve(100, f, 0.2, 0.2); Assert.assertEquals(result, 0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.1, 0.3); Assert.assertEquals(result, 0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.3, 0.45); Assert.assertEquals(result, 0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.3, 0.7); Assert.assertEquals(result, 0.5, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.2, 0.6); Assert.assertEquals(result, 0.5, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.05, 0.95); Assert.assertEquals(result, 0.5, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.85, 1.25); Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.8, 1.2); Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.85, 1.75); Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.55, 1.45); Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy()); result = solver.solve(100, f, 0.85, 5); Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy()); } } Other Java examples (source code examples)Here is a short list of links related to this Java NewtonSolverTest.java source code file: 
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