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block householder : minor optimization

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This commit is contained in:
Gael Guennebaud
2010-06-24 17:48:38 +02:00
parent 905beb0953
commit 6be06745df
2 changed files with 3 additions and 4 deletions
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Eigen/src/Householder/BlockHouseholder.h
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@@ -42,9 +42,8 @@ void ei_make_block_householder_triangular_factor(TriangularFactorType& triFactor
Index rs = vectors.rows() - i;
Scalar Vii = vectors(i,i);
vectors.const_cast_derived().coeffRef(i,i) = Scalar(1);
triFactor.col(i).head(i).noalias() = vectors.block(i, 0, rs, i).adjoint()
triFactor.col(i).head(i).noalias() = -hCoeffs(i) * vectors.block(i, 0, rs, i).adjoint()
* vectors.col(i).tail(rs);
triFactor.col(i).head(i) *= -hCoeffs(i);
vectors.const_cast_derived().coeffRef(i, i) = Vii;
// FIXME add .noalias() once the triangular product can work inplace
triFactor.col(i).head(i) = triFactor.block(0,0,i,i).template triangularView<Upper>()