public void UpdateDomain(CellMask cm, bool RestrictToCellMask = true)
{
var GridDat = m_bInput.GridDat;
int J = GridDat.iLogicalCells.NoOfLocalUpdatedCells;
this.Domain = cm;
int[][] newStencils = new int[J][];
var Mask = cm.GetBitMaskWithExternal();
foreach (int jCell in cm.ItemEnum)
{
int[] NeighCells, dummy;
GridDat.GetCellNeighbours(jCell, GetCellNeighbours_Mode.ViaVertices, out NeighCells, out dummy);
if (RestrictToCellMask == true)
{
NeighCells = NeighCells.Where(j => Mask[j]).ToArray();
}
Array.Sort(NeighCells);
int[] newStencil = ArrayTools.Cat(new int[] { jCell }, NeighCells);
if (this.Stencils == null ||
this.Stencils[jCell] == null && newStencil.Length > 0 ||
!ArrayTools.AreEqual(this.Stencils[jCell], newStencil))
{
// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// a re-computation of the aggregate cell basis is necessary
// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ComputeAggregateBasis(jCell, NeighCells);
}
newStencils[jCell] = newStencil;
}
for (int j = 0; j < J; j++)
{
if (newStencils[j] == null && this.AggregateBasisTrafo[j] != null)
{
this.AggregateBasisTrafo[j] = null;
}
Debug.Assert((newStencils[j] == null) == (this.AggregateBasisTrafo[j] == null));
if (newStencils[j] != null)
{
Debug.Assert(newStencils[j].Length == this.AggregateBasisTrafo[j].GetLength(0));
}
}
this.Stencils = newStencils;
}
/// <summary>
///
/// </summary>
/// <param name="output">output</param>
/// <param name="cm">mask on which the filtering should be performed</param>
/// <param name="input">input</param>
/// <param name="mode"></param>
public static void FilterStencilProjection(SinglePhaseField output, CellMask cm, SinglePhaseField input, PatchRecoveryMode mode)
{
var GridDat = input.GridDat;
if (!object.ReferenceEquals(output.GridDat, GridDat))
{
throw new ArgumentException();
}
if (!object.ReferenceEquals(input.GridDat, GridDat))
{
throw new ArgumentException();
}
if (cm == null)
{
cm = CellMask.GetFullMask(GridDat);
}
switch (mode)
{
case PatchRecoveryMode.L2_unrestrictedDom:
case PatchRecoveryMode.L2_restrictedDom: {
var Mask = cm.GetBitMaskWithExternal();
bool RestrictToCellMask = mode == PatchRecoveryMode.L2_restrictedDom;
foreach (int jCell in cm.ItemEnum)
{
int[] NeighCells, dummy;
GridDat.GetCellNeighbours(jCell, GetCellNeighbours_Mode.ViaVertices, out NeighCells, out dummy);
if (RestrictToCellMask == true)
{
NeighCells = NeighCells.Where(j => Mask[j]).ToArray();
}
FilterStencilProjection(output, jCell, NeighCells, input);
}
return;
}
case PatchRecoveryMode.ChebychevInteroplation: {
int P = input.Basis.Degree * 3;
double[] ChebyNodes = ChebyshevNodes(P);
NodeSet Nds = new NodeSet(GridDat.iGeomCells.RefElements[0], P, 1);
Nds.SetColumn(0, ChebyNodes);
Nds.LockForever();
Polynomial[] Polynomials = GetNodalPolynomials(ChebyNodes);
MultidimensionalArray PolyVals = MultidimensionalArray.Create(P, P);
for (int p = 0; p < P; p++)
{
Polynomials[p].Evaluate(PolyVals.ExtractSubArrayShallow(p, -1), Nds);
for (int i = 0; i < P; i++)
{
Debug.Assert(Math.Abs(((i == p) ? 1.0 : 0.0) - PolyVals[p, i]) <= 1.0e-8);
}
}
foreach (int jCell in cm.ItemEnum)
{
AffineTrafo T;
var NodalValues = NodalPatchRecovery(jCell, ChebyNodes, input, out T);
/*
* MultidimensionalArray Nodes2D = MultidimensionalArray.Create(P, P, 2);
* for (int i = 0; i < P; i++) {
* for (int j = 0; j < P; j++) {
* Nodes2D[i, j, 0] = ChebyNodes[i];
* Nodes2D[i, j, 1] = ChebyNodes[j];
* }
* }
* var _Nodes2D = Nodes2D.ResizeShallow(P*P, 2);
* var xNodes = _Nodes2D.ExtractSubArrayShallow(new int[] { 0, 0 }, new int[] { P*P - 1, 0 });
* var yNodes = _Nodes2D.ExtractSubArrayShallow(new int[] { 0, 1 }, new int[] { P*P - 1, 1 });
* int K = P*P;
*
* MultidimensionalArray xPolyVals = MultidimensionalArray.Create(P, K);
* MultidimensionalArray yPolyVals = MultidimensionalArray.Create(P, K);
*
* for (int p = 0; p < P; p++) {
* Polynomials[p].Evaluate(yPolyVals.ExtractSubArrayShallow(p, -1), yNodes);
* Polynomials[p].Evaluate(xPolyVals.ExtractSubArrayShallow(p, -1), xNodes);
*
* }
*
*
* double ERR = 0;
* for (int k = 0; k < K; k++) {
*
* double x = xNodes[k, 0];
* double y = yNodes[k, 0];
*
* double acc = 0;
* double BasisHits = 0.0;
* for (int i = 0; i < P; i++) {
* for (int j = 0; j < P; j++) {
*
* bool isNode = (Math.Abs(x - ChebyNodes[i]) < 1.0e-8) && (Math.Abs(y - ChebyNodes[j]) < 1.0e-8);
* double BasisSoll = isNode ? 1.0 : 0.0;
* if (isNode)
* Console.WriteLine();
*
* double Basis_ij = xPolyVals[i, k]*yPolyVals[j, k];
*
* Debug.Assert((Basis_ij - BasisSoll).Abs() < 1.0e-8);
*
* BasisHits += Math.Abs(Basis_ij);
*
* acc += Basis_ij*NodalValues[i, j];
* }
* }
* Debug.Assert(Math.Abs(BasisHits - 1.0) < 1.0e-8);
*
*
*
*
* double soll = yNodes[k,0];
* Debug.Assert((soll - acc).Pow2() < 1.0e-7);
* ERR = (soll - acc).Pow2();
* }
* Console.WriteLine(ERR);
*/
output.ProjectField(1.0,
delegate(int j0, int Len, NodeSet Nodes, MultidimensionalArray result) {
var K = Nodes.NoOfNodes;
MultidimensionalArray NT = T.Transform(Nodes);
var xNodes = new NodeSet(null, NT.ExtractSubArrayShallow(new int[] { 0, 0 }, new int[] { K - 1, 0 }));
var yNodes = new NodeSet(null, NT.ExtractSubArrayShallow(new int[] { 0, 1 }, new int[] { K - 1, 1 }));
MultidimensionalArray xPolyVals = MultidimensionalArray.Create(P, K);
MultidimensionalArray yPolyVals = MultidimensionalArray.Create(P, K);
for (int p = 0; p < P; p++)
{
Polynomials[p].Evaluate(yPolyVals.ExtractSubArrayShallow(p, -1), yNodes);
Polynomials[p].Evaluate(xPolyVals.ExtractSubArrayShallow(p, -1), xNodes);
}
for (int k = 0; k < K; k++)
{
double acc = 0;
for (int i = 0; i < P; i++)
{
for (int j = 0; j < P; j++)
{
acc += xPolyVals[i, k] * yPolyVals[j, k] * NodalValues[i, j];
}
}
result[0, k] = acc;
}
},
new CellQuadratureScheme(true, new CellMask(input.GridDat, Chunk.GetSingleElementChunk(jCell))));
}
return;
}
}
}
