Function Dune::XT::LA::calculate_q_from_qr

template<class MatrixType, class VectorType, class M = Common::MatrixAbstraction<MatrixType>>
typename M::template MatrixTypeTemplate<M::static_rows, M::static_rows> Dune::XT::LA::calculate_q_from_qr(const MatrixType &QR, const VectorType &tau)

Reconstructs the explicit orthogonal matrix Q from the compressed QR factorization stored in QR and tau.