  Multi-degree Tchebycheffian splines are splines with pieces drawn from
extended (complete) Tchebycheff spaces, which may differ from interval to
interval, and possibly of different dimensions. These are a natural extension
of multi-degree polynomial splines. Under quite mild assumptions, they can be
represented in terms of a so-called MDTB-spline basis; such basis possesses all
the characterizing properties of the classical polynomial B-spline basis. We
present a practical framework to compute MDTB-splines, and provide an
object-oriented implementation in Matlab. The implementation supports the
construction, differentiation, and visualization of MDTB-splines whose pieces
belong to Tchebycheff spaces that are null-spaces of constant-coefficient
linear differential operators. The construction relies on an extraction
operator that maps local Tchebycheffian Bernstein functions to the MDTB-spline
basis of interest.
