petsc-3.7.7 2017-09-25
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Sets the type of coarse grid interpolation to use


#include "petscdmda.h" 
#include "petscksp.h" 
PetscErrorCode  PCExoticSetType(PC pc,PCExoticType type)
Logically Collective on PC

Input Parameters

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.

See Also

PCEXOTIC, PCExoticType()

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages