/**
* <p>
* Performs a matrix multiplication on the block aligned submatrices. A is
* assumed to be block column vector that is lower triangular with diagonal elements set to 1.<br>
* <br>
* C = A^T * B
* </p>
*/
public static void multTransA_vecCol(int blockLength,
DSubmatrixD1 A, DSubmatrixD1 B,
DSubmatrixD1 C)
{
int widthA = A.col1 - A.col0;
if (widthA > blockLength)
{
throw new ArgumentException("A is expected to be at most one block wide.");
}
for (int j = B.col0; j < B.col1; j += blockLength)
{
int widthB = Math.Min(blockLength, B.col1 - j);
int indexC = C.row0 * C.original.numCols + (j - B.col0 + C.col0) * widthA;
for (int k = A.row0; k < A.row1; k += blockLength)
{
int heightA = Math.Min(blockLength, A.row1 - k);
int indexA = k * A.original.numCols + A.col0 * heightA;
int indexB = (k - A.row0 + B.row0) * B.original.numCols + j * heightA;
if (k == A.row0)
{
multTransABlockSet_lowerTriag(A.original.data, B.original.data, C.original.data,
indexA, indexB, indexC, heightA, widthA, widthB);
}
else
{
InnerMultiplication_DDRB.blockMultPlusTransA(A.original.data, B.original.data, C.original.data,
indexA, indexB, indexC, heightA, widthA, widthB);
}
}
}
}
/**
* C = C + A^T*B
*
* @param blockLength
* @param A row block vector
* @param B row block vector
* @param C
*/
public static void multPlusTransA(int blockLength,
DSubmatrixD1 A, DSubmatrixD1 B,
DSubmatrixD1 C)
{
int heightA = Math.Min(blockLength, A.row1 - A.row0);
for (int i = C.row0 + blockLength; i < C.row1; i += blockLength)
{
int heightC = Math.Min(blockLength, C.row1 - i);
int indexA = A.row0 * A.original.numCols + (i - C.row0 + A.col0) * heightA;
for (int j = i; j < C.col1; j += blockLength)
{
int widthC = Math.Min(blockLength, C.col1 - j);
int indexC = i * C.original.numCols + j * heightC;
int indexB = B.row0 * B.original.numCols + (j - C.col0 + B.col0) * heightA;
InnerMultiplication_DDRB.blockMultPlusTransA(A.original.data, B.original.data, C.original.data,
indexA, indexB, indexC, heightA, heightC, widthC);
}
}
}
