public static void multPlusTransA(int blockLength,
FSubmatrixD1 A, FSubmatrixD1 B,
FSubmatrixD1 C)
{
for (int i = A.col0; i < A.col1; i += blockLength)
{
int widthA = Math.Min(blockLength, A.col1 - i);
for (int j = B.col0; j < B.col1; j += blockLength)
{
int widthB = Math.Min(blockLength, B.col1 - j);
int indexC = (i - A.col0 + 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 + i * heightA;
int indexB = (k - A.row0 + B.row0) * B.original.numCols + j * heightA;
InnerMultiplication_FDRB.blockMultPlusTransA(A.original.data, B.original.data, C.original.data,
indexA, indexB, indexC, heightA, widthA, widthB);
}
}
}
}
/**
* <p>
* Performs:<br>
* <br>
* A = A + α B <sup>T</sup>B
* </p>
*
* @param blockLength Size of the block in the block matrix.
* @param alpha scaling factor for right hand side.
* @param A Block aligned submatrix.
* @param B Block aligned submatrix.
*/
public static void rankNUpdate(int blockLength, float alpha,
FSubmatrixD1 A, FSubmatrixD1 B)
{
int heightB = B.row1 - B.row0;
if (heightB > blockLength)
{
throw new ArgumentException("Height of B cannot be greater than the block length");
}
int N = B.col1 - B.col0;
if (A.col1 - A.col0 != N)
{
throw new ArgumentException("A does not have the expected number of columns based on B's width");
}
if (A.row1 - A.row0 != N)
{
throw new ArgumentException("A does not have the expected number of rows based on B's width");
}
for (int i = B.col0; i < B.col1; i += blockLength)
{
int indexB_i = B.row0 * B.original.numCols + i * heightB;
int widthB_i = Math.Min(blockLength, B.col1 - i);
int rowA = i - B.col0 + A.row0;
int heightA = Math.Min(blockLength, A.row1 - rowA);
for (int j = B.col0; j < B.col1; j += blockLength)
{
int widthB_j = Math.Min(blockLength, B.col1 - j);
int indexA = rowA * A.original.numCols + (j - B.col0 + A.col0) * heightA;
int indexB_j = B.row0 * B.original.numCols + j * heightB;
InnerMultiplication_FDRB.blockMultPlusTransA(alpha,
B.original.data, B.original.data, A.original.data,
indexB_i, indexB_j, indexA, heightB, widthB_i, widthB_j);
}
}
}
