Function rgsl::linear_algebra::hessenberg_unpack_accum

pub fn hessenberg_unpack_accum(
    h: &mut MatrixF64,
    tau: &mut VectorF64,
    v: &mut MatrixF64
) -> Value

This function is similar to gsl_linalg_hessenberg_unpack, except it accumulates the matrix U into V, so that V’ = VU. The matrix V must be initialized prior to calling this function. Setting V to the identity matrix provides the same result as gsl_linalg_hessenberg_unpack. If H is order N, then V must have N columns but may have any number of rows.