public void solve(DMatrixRBlock B, DMatrixRBlock X)
{
if (B.numRows != QR.numRows)
{
throw new ArgumentException("Row of B and A do not match");
}
X.reshape(QR.numCols, B.numCols);
// The system being solved for can be described as:
// Q*R*X = B
// First apply householder reflectors to B
// Y = Q^T*B
//decomposer.applyQTran(B);
// Second solve for Y using the upper triangle matrix R and the just computed Y
// X = R^-1 * Y
MatrixOps_DDRB.extractAligned(B, X);
// extract a block aligned matrix
int M = Math.Min(QR.numRows, QR.numCols);
TriangularSolver_DDRB.solve(QR.blockLength, true,
new DSubmatrixD1(QR, 0, M, 0, M), new DSubmatrixD1(X), false);
}
virtual public void solve(DMatrixRBlock B, DMatrixRBlock X)
{
if (B.blockLength != blockLength)
{
throw new ArgumentException("Unexpected blocklength in B.");
}
DSubmatrixD1 L = new DSubmatrixD1(decomposer.getT(null));
if (X == null)
{
//X = B.create<DMatrixRBlock>(L.col1, B.numCols);
X = new DMatrixRBlock(L.col1, B.numCols);
}
else
{
X.reshape(L.col1, B.numCols, blockLength, false);
}
// L * L^T*X = B
// Solve for Y: L*Y = B
TriangularSolver_DDRB.solve(blockLength, false, L, new DSubmatrixD1(B), false);
// L^T * X = Y
TriangularSolver_DDRB.solve(blockLength, false, L, new DSubmatrixD1(B), true);
if (X != null)
{
// copy the solution from B into X
MatrixOps_DDRB.extractAligned(B, X);
}
}