Package ch.akuhn.matrix

Examples of ch.akuhn.matrix.Matrix

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  private static final double epsilon = 1e-9;

  @Test
  public void shouldFindEigenvalues() {
    Matrix A = Matrix.from(3, 3,
        0, 1, -1,
        1, 1, 0,
        -1, 0, 1);
    Eigenvalues eigen = new AllEigenvalues(A).run();
   
    assertEquals(-1, eigen.value[0], epsilon);
    assertEquals(1, eigen.value[1], epsilon);
    assertEquals(2, eigen.value[2], epsilon);

    assert A.mult(eigen.vector[0]).equals(eigen.vector[0].times(eigen.value[0]), epsilon);
    assert A.mult(eigen.vector[1]).equals(eigen.vector[1].times(eigen.value[1]), epsilon);
    assert A.mult(eigen.vector[2]).equals(eigen.vector[2].times(eigen.value[2]), epsilon);
  }
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    assert A.mult(eigen.vector[2]).equals(eigen.vector[2].times(eigen.value[2]), epsilon);
  }
 
  @Test
  public void shouldReturnLargest() {
    Matrix A = Matrix.dense(10, 10);
    for (int n = 0; n < 10; n++) A.put(n, n, n);
    Eigenvalues eigen = new AllEigenvalues(A).largest(3).run();
    assertEquals(3, eigen.value.length);
    assertEquals(7, eigen.value[0], epsilon);
    assertEquals(8, eigen.value[1], epsilon);
    assertEquals(9, eigen.value[2], epsilon);
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  private FewEigenvalues eigen;
  private Matrix A;

  private Matrix randomSymetricMatrix(int n) {
    Matrix S = Matrix.dense(n, n);
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < i; j++) {
        double value = Math.random() * 23;
        S.put(i, j, value);
        S.put(j, i, value);
      }
    }
    return S;
  }
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Related Classes of ch.akuhn.matrix.Matrix

  • ch.akuhn.matrix.eigenvalues.AllEigenvaluesTest
  • ch.akuhn.matrix.eigenvalues.FewEigenvaluesTest
  • ch.akuhn.util.PrintOn
  • java.util.NoSuchElementException
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