int HYPRE_StructPFMGSetRAPType (HYPRE_StructSolver solver, int rap_type)

(Optional) Set type of coarse-grid operator to use

Documentation

(Optional) Set type of coarse-grid operator to use.

Current operators set by rap_type are:

\begin{tabular}{l@{ -- }l} 0 Galerkin (default) 1 non-Galerkin 5-pt or 7-pt stencils

Both operators are constructed algebraically. The non-Galerkin option maintains a 5-pt stencil in 2D and a 7-pt stencil in 3D on all grid levels. The stencil coefficients are computed by averaging techniques.

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