TestDiagonalMatrixOperations.cpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: TestDiagonalMatrixOperations.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
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// Description:
//
///////////////////////////////////////////////////////////////////////////////
 
#include <boost/test/unit_test.hpp>
 
#include <LibUtilities/LinearAlgebra/NekMatrix.hpp>
#include <UnitTests/CountedObject.h>
 
#include <boost/test/tools/floating_point_comparison.hpp>
#include <boost/test/unit_test.hpp>
 
namespace Nektar::DiagonalMatrixOperationsUnitTests
{
BOOST_AUTO_TEST_CASE(TestDoubleDiagonalVectorMultiplication)
{
    double m_buf[] = {1, 2, 3};
    double v_buf[] = {4, 5, 6};
 
    NekMatrix<double> m(3, 3, m_buf, eDIAGONAL);
    NekVector<double> v(3, v_buf);
 
    double expected_result_buf[] = {4, 10, 18};
    NekVector<double> expected_result(3, expected_result_buf);
 
    NekVector<double> result = m * v;
 
    BOOST_CHECK_EQUAL(expected_result, result);
}
 
BOOST_AUTO_TEST_CASE(TestDoubleScaledDiagonalVectorMultiplication)
{
    double m_buf[] = {1, 2, 3};
    double v_buf[] = {4, 5, 6};
 
    std::shared_ptr<NekMatrix<double>> inner(
        new NekMatrix<double>(3, 3, m_buf, eDIAGONAL));
    NekMatrix<NekMatrix<double>, ScaledMatrixTag> m(5.0, inner);
 
    NekVector<double> v(3, v_buf);
 
    double expected_result_buf[] = {20, 50, 90};
    NekVector<double> expected_result(3, expected_result_buf);
 
    NekVector<double> result = m * v;
 
    BOOST_CHECK_EQUAL(expected_result, result);
}
 
} // namespace Nektar::DiagonalMatrixOperationsUnitTests