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BAEL 767 - Introduction to Apache Commons Math (update) (#1670) 

* BAEL 767 - Introduction to apache commons math

* BAEL 767 - Moving examples to test classes

* BAEL 767 - Renaming tests with BDD convention
This commit is contained in:
Alexandre Lombard 2017-04-18 09:58:26 +02:00 committed by maibin
parent 7d6bf29092
commit 1aff8ca17d
9 changed files with 224 additions and 0 deletions
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44
apache-commons-math/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>apache-commons-math</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-math3</artifactId>
<version>3.6.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

20
apache-commons-math/src/test/java/com/baeldung/commons/math/ComplexTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.complex.Complex;
import org.junit.Assert;
import org.junit.Test;
public class ComplexTests {
@Test
public void whenComplexPow_thenCorrect() {
Complex first = new Complex(1.0, 3.0);
Complex second = new Complex(2.0, 5.0);
Complex power = first.pow(second);
Assert.assertEquals(-0.007563724861696302, power.getReal(), 1e-7);
Assert.assertEquals(0.01786136835085382, power.getImaginary(), 1e-7);
}
}

20
apache-commons-math/src/test/java/com/baeldung/commons/math/FractionTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.fraction.Fraction;
import org.apache.commons.math3.fraction.FractionFormat;
import org.junit.Assert;
import org.junit.Test;
public class FractionTests {
@Test
public void whenFractionAdd_thenCorrect() {
Fraction lhs = new Fraction(1, 3);
Fraction rhs = new Fraction(2, 5);
Fraction sum = lhs.add(rhs);
Assert.assertEquals(11, sum.getNumerator());
Assert.assertEquals(15, sum.getDenominator());
}
}

21
apache-commons-math/src/test/java/com/baeldung/commons/math/GeometryTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.geometry.euclidean.twod.Line;
import org.apache.commons.math3.geometry.euclidean.twod.Vector2D;
import org.junit.Assert;
import org.junit.Test;
public class GeometryTests {
@Test
public void whenLineIntersection_thenCorrect() {
Line l1 = new Line(new Vector2D(0, 0), new Vector2D(1, 1), 0);
Line l2 = new Line(new Vector2D(0, 1), new Vector2D(1, 1.5), 0);
Vector2D intersection = l1.intersection(l2);
Assert.assertEquals(2, intersection.getX(), 1e-7);
Assert.assertEquals(2, intersection.getY(), 1e-7);
}
}

21
apache-commons-math/src/test/java/com/baeldung/commons/math/IntegrationTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.analysis.UnivariateFunction;
import org.apache.commons.math3.analysis.integration.SimpsonIntegrator;
import org.apache.commons.math3.analysis.integration.UnivariateIntegrator;
import org.junit.Assert;
import org.junit.Test;
public class IntegrationTests {
@Test
public void whenUnivariateIntegratorIntegrate_thenCorrect() {
final UnivariateFunction function = v -> v;
final UnivariateIntegrator integrator = new SimpsonIntegrator(1.0e-12, 1.0e-8, 1, 32);
final double i = integrator.integrate(100, function, 0, 10);
Assert.assertEquals(16 + 2d/3d, i, 1e-7);
}
}

25
apache-commons-math/src/test/java/com/baeldung/commons/math/LinearAlgebraTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.linear.*;
import org.junit.Assert;
import org.junit.Test;
public class LinearAlgebraTests {
@Test
public void whenDecompositionSolverSolve_thenCorrect() {
RealMatrix a =
new Array2DRowRealMatrix(new double[][] { { 2, 3, -2 }, { -1, 7, 6 }, { 4, -3, -5 } },
false);
RealVector b = new ArrayRealVector(new double[] { 1, -2, 1 }, false);
DecompositionSolver solver = new LUDecomposition(a).getSolver();
RealVector solution = solver.solve(b);
Assert.assertEquals(-0.3698630137, solution.getEntry(0), 1e-7);
Assert.assertEquals(0.1780821918, solution.getEntry(1), 1e-7);
Assert.assertEquals(-0.602739726, solution.getEntry(2), 1e-7);
}
}

15
apache-commons-math/src/test/java/com/baeldung/commons/math/ProbabilitiesTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.distribution.NormalDistribution;
import org.junit.Test;
public class ProbabilitiesTests {
@Test
public void whenNormalDistributionSample_thenSuccess() {
final NormalDistribution normalDistribution = new NormalDistribution(10, 3);
System.out.println(normalDistribution.sample());
}
}

20
apache-commons-math/src/test/java/com/baeldung/commons/math/RootFindingTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.analysis.UnivariateFunction;
import org.apache.commons.math3.analysis.solvers.BracketingNthOrderBrentSolver;
import org.apache.commons.math3.analysis.solvers.UnivariateSolver;
import org.junit.Assert;
import org.junit.Test;
public class RootFindingTests {
@Test
public void whenUnivariateSolverSolver_thenCorrect() {
final UnivariateFunction function = v -> Math.pow(v, 2) - 2;
UnivariateSolver solver = new BracketingNthOrderBrentSolver(1.0e-12, 1.0e-8, 5);
double c = solver.solve(100, function, -10.0, 10.0, 0);
Assert.assertEquals(-Math.sqrt(2), c, 1e-7);
}
}

38
apache-commons-math/src/test/java/com/baeldung/commons/math/StatisticsTests.java Normal file
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package com.baeldung.commons.math;
import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class StatisticsTests {
private double[] values;
private DescriptiveStatistics descriptiveStatistics;
@Before
public void setUp() {
values = new double[] {65, 51 , 16, 11 , 6519, 191 ,0 , 98, 19854, 1, 32};
descriptiveStatistics = new DescriptiveStatistics();
for(double v : values) {
descriptiveStatistics.addValue(v);
}
}
@Test
public void whenDescriptiveStatisticsGetMean_thenCorrect() {
Assert.assertEquals(2439.8181818181815, descriptiveStatistics.getMean(), 1e-7);
}
@Test
public void whenDescriptiveStatisticsGetMedian_thenCorrect() {
Assert.assertEquals(51, descriptiveStatistics.getPercentile(50), 1e-7);
}
@Test
public void whenDescriptiveStatisticsGetStandardDeviation_thenCorrect() {
Assert.assertEquals(6093.054649651221, descriptiveStatistics.getStandardDeviation(), 1e-7);
}
}