(Optional) Set the (components of) the Raviart-Thomas (
) and the Nedelec
(
) interpolation matrices.
This function is generally intended to be used only for high-order 
discretizations (in the lowest order case, these matrices are constructed
internally in ADS from the discreet gradient and curl matrices and the
coordinates of the vertices), though it can also be used in the lowest-order
case or for other types of discretizations.
By definition, RT_Pi and ND_Pi are the matrix representations of the linear
operators and that interpolate (high-order) vector
nodal finite elements into the (high-order) Raviart-Thomas and Nedelec
spaces. The component matrices are defined in both cases as 
and similarly for 
and 
. Note that all these
operators depend on the choice of the basis and degrees of freedom in the
high-order spaces.
The column numbering of RT_Pi and ND_Pi should be node-based, i.e. the
/
/
components of the first node (vertex or high-order dof) should be
listed first, followed by the // components of the second node and
so on (see the documentation of HYPRE_BoomerAMGSetDofFunc).
If used, this function should be called before hypre_ADSSetup() and there is
no need to provide the vertex coordinates. Furthermore, only one of the sets
and 
needs to be
specified (though it is OK to provide both). If RT_Pix is NULL, then scalar
-based ADS cycles, i.e. those with cycle_type > 10, will be
unavailable. Similarly, ADS cycles based on monolithic (cycle_type <
10) require that RT_Pi is not NULL. The same restrictions hold for the sets
and 
-- only one of them
needs to be specified, and the availability of each enables different AMS
cycle type options.
