/**
* Inverts an upper or lower triangular block submatrix. Uses a row-oriented approach.
*
* @param upper Is it upper or lower triangular.
* @param T Triangular matrix that is to be inverted. Must be block aligned. Not Modified.
* @param T_inv Where the inverse is stored. This can be the same as T. Modified.
* @param workspace Work space variable that is size blockLength*blockLength.
*/
public static void invert(int blockLength,
bool upper,
DSubmatrixD1 T,
DSubmatrixD1 T_inv,
GrowArray <DGrowArray> workspace)
{
if (upper)
{
throw new ArgumentException("Upper triangular matrices not supported yet");
}
//CONCURRENT_INLINE if (T.original == T_inv.original)
//CONCURRENT_INLINE throw new ArgumentException("Same instance not allowed for concurrent");
//if (workspace == null)
// workspace = new GrowArray<DGrowArray>(new DGrowArray());
//else
// workspace.reset();
if (T.row0 != T_inv.row0 || T.row1 != T_inv.row1 || T.col0 != T_inv.col0 || T.col1 != T_inv.col1)
{
throw new ArgumentException("T and T_inv must be at the same elements in the matrix");
}
int blockSize = blockLength * blockLength;
//CONCURRENT_REMOVE_BELOW
double[] temp = workspace.grow().reshape(blockSize).data;
int M = T.row1 - T.row0;
double[] dataT = T.original.data;
double[] dataX = T_inv.original.data;
int offsetT = T.row0 * T.original.numCols + M * T.col0;
for (int rowT = 0; rowT < M; rowT += blockLength)
{
int _rowT = rowT; // Needed for concurrent lambdas
int heightT = Math.Min(T.row1 - (rowT + T.row0), blockLength);
int indexII = offsetT + T.original.numCols * (rowT + T.row0) + heightT * (rowT + T.col0);
//CONCURRENT_BELOW EjmlConcurrency.loopFor(0, rowT, blockLength, workspace, ( work, colT ) -> {
for (int colT = 0; colT < rowT; colT += blockLength)
{
//CONCURRENT_INLINE double[] temp = work.reshape(blockSize).data;
int widthX = Math.Min(T.col1 - (colT + T.col0), blockLength);
Array.Fill(temp, 0);
for (int k = colT; k < _rowT; k += blockLength)
{
int widthT = Math.Min(T.col1 - (k + T.col0), blockLength);
int indexL2 = offsetT + T.original.numCols * (_rowT + T.row0) + heightT * (k + T.col0);
int indexX2 = offsetT + T.original.numCols * (k + T.row0) + widthT * (colT + T.col0);
InnerMultiplication_DDRB.blockMultMinus(dataT, dataX, temp, indexL2, indexX2, 0, heightT, widthT, widthX);
}
int indexX = offsetT + T.original.numCols * (_rowT + T.row0) + heightT * (colT + T.col0);
InnerTriangularSolver_DDRB.solveL(dataT, temp, heightT, widthX, heightT, indexII, 0);
System.Array.Copy(temp, 0, dataX, indexX, widthX * heightT);
}
//CONCURRENT_ABOVE });
InnerTriangularSolver_DDRB.invertLower(dataT, dataX, heightT, indexII, indexII);
}
}
//CONCURRENT_OMIT_BEGIN
/**
* Inverts an upper or lower triangular block submatrix. Uses a row oriented approach.
*
* @param upper Is it upper or lower triangular.
* @param T Triangular matrix that is to be inverted. Overwritten with solution. Modified.
* @param workspace Work space variable that is size blockLength*blockLength.
*/
public static void invert(int blockLength,
bool upper,
DSubmatrixD1 T,
GrowArray <DGrowArray> workspace)
{
if (upper)
{
throw new ArgumentException("Upper triangular matrices not supported yet");
}
// FORCE to disable
workspace = null;
if (workspace == null)
{
//workspace = new GrowArray<>(DGrowArray::new);
}
else
{
workspace.reset();
}
int blockSize = blockLength * blockLength;
double[] temp = workspace.grow().reshape(blockSize).data;
int M = T.row1 - T.row0;
double[] dataT = T.original.data;
int offsetT = T.row0 * T.original.numCols + M * T.col0;
for (int i = 0; i < M; i += blockLength)
{
int heightT = Math.Min(T.row1 - (i + T.row0), blockLength);
int indexII = offsetT + T.original.numCols * (i + T.row0) + heightT * (i + T.col0);
for (int j = 0; j < i; j += blockLength)
{
int widthX = Math.Min(T.col1 - (j + T.col0), blockLength);
Array.Fill(temp, 0);
for (int k = j; k < i; k += blockLength)
{
int widthT = Math.Min(T.col1 - (k + T.col0), blockLength);
int indexL2 = offsetT + T.original.numCols * (i + T.row0) + heightT * (k + T.col0);
int indexX2 = offsetT + T.original.numCols * (k + T.row0) + widthT * (j + T.col0);
InnerMultiplication_DDRB.blockMultMinus(dataT, dataT, temp, indexL2, indexX2, 0, heightT, widthT, widthX);
}
int indexX = offsetT + T.original.numCols * (i + T.row0) + heightT * (j + T.col0);
InnerTriangularSolver_DDRB.solveL(dataT, temp, heightT, widthX, heightT, indexII, 0);
System.Array.Copy(temp, 0, dataT, indexX, widthX * heightT);
}
InnerTriangularSolver_DDRB.invertLower(dataT, heightT, indexII);
}
}