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18 package org.apache.commons.math.special;
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20 import org.apache.commons.math.MathException;
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22 import junit.framework.TestCase;
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26
27 public class ErfTest extends TestCase {
28
29 public void testErf0() throws MathException {
30 double actual = Erf.erf(0.0);
31 double expected = 0.0;
32 assertEquals(expected, actual, 1.0e-5);
33 }
34
35 public void testErf1960() throws MathException {
36 double x = 1.960 / Math.sqrt(2.0);
37 double actual = Erf.erf(x);
38 double expected = 0.95;
39 assertEquals(expected, actual, 1.0e-5);
40
41 actual = Erf.erf(-x);
42 expected = -expected;
43 assertEquals(expected, actual, 1.0e-5);
44 }
45
46 public void testErf2576() throws MathException {
47 double x = 2.576 / Math.sqrt(2.0);
48 double actual = Erf.erf(x);
49 double expected = 0.99;
50 assertEquals(expected, actual, 1.0e-5);
51
52 actual = Erf.erf(-x);
53 expected = -expected;
54 assertEquals(expected, actual, 1.0e-5);
55 }
56
57 public void testErf2807() throws MathException {
58 double x = 2.807 / Math.sqrt(2.0);
59 double actual = Erf.erf(x);
60 double expected = 0.995;
61 assertEquals(expected, actual, 1.0e-5);
62
63 actual = Erf.erf(-x);
64 expected = -expected;
65 assertEquals(expected, actual, 1.0e-5);
66 }
67
68 public void testErf3291() throws MathException {
69 double x = 3.291 / Math.sqrt(2.0);
70 double actual = Erf.erf(x);
71 double expected = 0.999;
72 assertEquals(expected, actual, 1.0e-5);
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74 actual = Erf.erf(-x);
75 expected = -expected;
76 assertEquals(expected, actual, 1.0e-5);
77 }
78 }