public void CompareWithOriginalSparseMatrix()
{
var sparseMatrix = new SparseMatrix(3);
sparseMatrix[0, 0] = -1;
sparseMatrix[0, 1] = 5;
sparseMatrix[0, 2] = 6;
sparseMatrix[1, 0] = 3;
sparseMatrix[1, 1] = -6;
sparseMatrix[1, 2] = 1;
sparseMatrix[2, 0] = 6;
sparseMatrix[2, 1] = 8;
sparseMatrix[2, 2] = 9;
var ilu = new ILU0Preconditioner();
ilu.Initialize(sparseMatrix);
var original = GetLowerTriangle(ilu).Multiply(GetUpperTriangle(ilu));
for (var i = 0; i < sparseMatrix.RowCount; i++)
{
for (var j = 0; j < sparseMatrix.ColumnCount; j++)
{
AssertHelpers.AlmostEqualRelative(sparseMatrix[i, j], original[i, j], 5);
}
}
}
public void CompareWithOriginalSparseMatrix()
{
var sparseMatrix = new SparseMatrix(3);
sparseMatrix[0, 0] = -1;
sparseMatrix[0, 1] = 5;
sparseMatrix[0, 2] = 6;
sparseMatrix[1, 0] = 3;
sparseMatrix[1, 1] = -6;
sparseMatrix[1, 2] = 1;
sparseMatrix[2, 0] = 6;
sparseMatrix[2, 1] = 8;
sparseMatrix[2, 2] = 9;
var ilu = new ILU0Preconditioner();
ilu.Initialize(sparseMatrix);
var original = GetLowerTriangle(ilu).Multiply(GetUpperTriangle(ilu));
for (var i = 0; i < sparseMatrix.RowCount; i++)
{
for (var j = 0; j < sparseMatrix.ColumnCount; j++)
{
Assert.IsTrue(sparseMatrix[i, j].Real.AlmostEqualNumbersBetween(original[i, j].Real, -Epsilon.Magnitude()), "#01-" + i + "-" + j);
Assert.IsTrue(sparseMatrix[i, j].Imaginary.AlmostEqualNumbersBetween(original[i, j].Imaginary, -Epsilon.Magnitude()), "#02-" + i + "-" + j);
}
}
}
/// <summary>
/// Invoke method from <c>Ilutp</c> class.
/// </summary>
/// <typeparam name="T">Type of the return value.</typeparam>
/// <param name="ilu"><c>IncompleteLU</c> instance.</param>
/// <param name="methodName">Method name.</param>
/// <returns>Result of the method invocation.</returns>
static T GetMethod <T>(ILU0Preconditioner ilu, string methodName)
{
var type = ilu.GetType();
var methodInfo = type.GetMethod(
methodName,
BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static,
null,
CallingConventions.Standard,
new Type[0],
null);
var obj = methodInfo.Invoke(ilu, null);
return((T)obj);
}
/// <summary>
/// Get lower triangle.
/// </summary>
/// <param name="ilu"><c>IncompleteLU</c> instance.</param>
/// <returns>Lower triangle.</returns>
static Matrix <float> GetLowerTriangle(ILU0Preconditioner ilu)
{
return(GetMethod <Matrix <float> >(ilu, "LowerTriangle"));
}
/// <summary>
/// Get upper triangle.
/// </summary>
/// <param name="ilu"><c>IncompleteLU</c> instance.</param>
/// <returns>Upper triangle.</returns>
static Matrix <Complex> GetUpperTriangle(ILU0Preconditioner ilu)
{
return(GetMethod <Matrix <Complex> >(ilu, "UpperTriangle"));
}
