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Introduce third template parameter to HouseholderSequence: int Side.

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When it's OnTheRight, we read householder vectors as rows above the diagonal.
With unit test. The use case will be bidiagonalization.
This commit is contained in:
Benoit Jacob
2010-01-14 19:16:49 -05:00
parent 5d796e363c
commit f1d1756cdd
4 changed files with 69 additions and 37 deletions
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22
test/householder.cpp
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@@ -106,27 +106,15 @@ template<typename MatrixType> void householder(const MatrixType& m)
m5.block(shift,0,brows,cols).template triangularView<StrictlyLower>().setZero();
VERIFY_IS_APPROX(hseq * m5, m1); // test applying hseq directly
m3 = hseq;
VERIFY_IS_APPROX(m3*m5, m1); // test evaluating hseq to a dense matrix, then applying
VERIFY_IS_APPROX(m3 * m5, m1); // test evaluating hseq to a dense matrix, then applying
#if 0
// test householder sequence on the right with a shift
TMatrixType tm1 = m1.transpose();
TMatrixType tm2 = m2.transpose();
int bcols = cols - shift;
VBlockMatrixType vbm =
HouseholderQR<HBlockMatrixType> qr(hbm);
m2 = m1;
m2.block(shift,0,brows,cols) = qr.matrixQR();
HCoeffsVectorType hc = qr.hCoeffs().conjugate();
HouseholderSequence<MatrixType, HCoeffsVectorType> hseq(m2, hc, false, hc.size(), shift);
MatrixType m5 = m2;
m5.block(shift,0,brows,cols).template triangularView<StrictlyLower>().setZero();
VERIFY_IS_APPROX(hseq * m5, m1); // test applying hseq directly
m3 = hseq;
VERIFY_IS_APPROX(m3*m5, m1); // test evaluating hseq to a dense matrix, then applying
#endif
HouseholderSequence<TMatrixType, HCoeffsVectorType, OnTheRight> rhseq(tm2, hc, false, hc.size(), shift);
VERIFY_IS_APPROX(rhseq * m5, m1); // test applying rhseq directly
m3 = rhseq;
VERIFY_IS_APPROX(m3 * m5, m1); // test evaluating rhseq to a dense matrix, then applying
}
void test_householder()