#include "petscpcmg.h" #include "petscdmda.h" PetscErrorCode PCExoticSetType(PC pc,PCExoticType type)Logically Collective on PC
|pc||- the preconditioner context|
|type||- either PC_EXOTIC_FACE or PC_EXOTIC_WIREBASKET (defaults to face)|
Notes: The face based interpolation has 1 degree of freedom per face and ignores the edge and vertex values completely in the coarse problem. For any seven point stencil the interpolation of a constant on all faces into the interior is that constant.
The wirebasket interpolation has 1 degree of freedom per vertex, per edge and per face. A constant on the subdomain boundary is interpolated as that constant in the interior of the domain.
The coarse grid matrix is obtained via the Galerkin computation A_c = R A R^T, hence if A is nonsingular A_c is also nonsingular.
Both interpolations are suitable for only scalar problems.
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages