Function rgsl::linear_algebra::QR_QTvec

pub fn QR_QTvec(qr: &MatrixF64, tau: &VectorF64, v: &mut VectorF64) -> Value

This function applies the matrix Q^T encoded in the decomposition (QR,tau) to the vector v, storing the result Q^T v in v. The matrix multiplication is carried out directly using the encoding of the Householder vectors without needing to form the full matrix Q^T.