  The third paper in our series on open source MATLAB / GNU Octave
implementation of the discontinuous Galerkin (DG) method(s) focuses on a
hybridized formulation. The main aim of this ongoing work is to develop rapid
prototyping techniques covering a range of standard DG methodologies and
suitable for small to medium sized applications. Our FESTUNG package relies on
fully vectorized matrix / vector operations throughout, and all details of the
implementation are fully documented. Once again, great care was taken to
maintain a direct mapping between discretization terms and code routines as
well as to ensure full compatibility to GNU Octave. The current work formulates
a hybridized DG scheme for linear advection problem, describes hybrid
approximation spaces on the mesh skeleton, and compares the performance of this
discretization to the standard (element-based) DG method for different
polynomial orders.
