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17 package org.apache.commons.math4.legacy.analysis.solvers;
18
19 import org.apache.commons.math4.legacy.analysis.QuinticFunction;
20 import org.apache.commons.math4.legacy.analysis.UnivariateFunction;
21 import org.apache.commons.math4.legacy.analysis.function.Sin;
22 import org.apache.commons.math4.core.jdkmath.JdkMath;
23 import org.junit.Assert;
24 import org.junit.Test;
25
26
27
28 public final class BisectionSolverTest {
29 @Test
30 public void testSinZero() {
31 UnivariateFunction f = new Sin();
32 double result;
33
34 BisectionSolver solver = new BisectionSolver();
35 result = solver.solve(100, f, 3, 4);
36 Assert.assertEquals(result, JdkMath.PI, solver.getAbsoluteAccuracy());
37
38 result = solver.solve(100, f, 1, 4);
39 Assert.assertEquals(result, JdkMath.PI, solver.getAbsoluteAccuracy());
40 }
41
42 @Test
43 public void testQuinticZero() {
44 UnivariateFunction f = new QuinticFunction();
45 double result;
46
47 BisectionSolver solver = new BisectionSolver();
48 result = solver.solve(100, f, -0.2, 0.2);
49 Assert.assertEquals(result, 0, solver.getAbsoluteAccuracy());
50
51 result = solver.solve(100, f, -0.1, 0.3);
52 Assert.assertEquals(result, 0, solver.getAbsoluteAccuracy());
53
54 result = solver.solve(100, f, -0.3, 0.45);
55 Assert.assertEquals(result, 0, solver.getAbsoluteAccuracy());
56
57 result = solver.solve(100, f, 0.3, 0.7);
58 Assert.assertEquals(result, 0.5, solver.getAbsoluteAccuracy());
59
60 result = solver.solve(100, f, 0.2, 0.6);
61 Assert.assertEquals(result, 0.5, solver.getAbsoluteAccuracy());
62
63 result = solver.solve(100, f, 0.05, 0.95);
64 Assert.assertEquals(result, 0.5, solver.getAbsoluteAccuracy());
65
66 result = solver.solve(100, f, 0.85, 1.25);
67 Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
68
69 result = solver.solve(100, f, 0.8, 1.2);
70 Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
71
72 result = solver.solve(100, f, 0.85, 1.75);
73 Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
74
75 result = solver.solve(100, f, 0.55, 1.45);
76 Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
77
78 result = solver.solve(100, f, 0.85, 5);
79 Assert.assertEquals(result, 1.0, solver.getAbsoluteAccuracy());
80
81 Assert.assertTrue(solver.getEvaluations() > 0);
82 }
83
84 @Test
85 public void testMath369() {
86 UnivariateFunction f = new Sin();
87 BisectionSolver solver = new BisectionSolver();
88 Assert.assertEquals(JdkMath.PI, solver.solve(100, f, 3.0, 3.2, 3.1), solver.getAbsoluteAccuracy());
89 }
90 }