typedef enum { PC_MG_GALERKIN_BOTH,PC_MG_GALERKIN_PMAT,PC_MG_GALERKIN_MAT, PC_MG_GALERKIN_NONE, PC_MG_GALERKIN_EXTERNAL} PCMGGalerkinType;
| PC_MG_GALERKIN_PMAT | - computes the pmat (matrix from which the preconditioner is built) via the Galerkin process from the finest grid | |
| PC_MG_GALERKIN_MAT | - computes the mat (matrix used to apply the operator) via the Galerkin process from the finest grid | |
| PC_MG_GALERKIN_BOTH | - computes both the mat and pmat via the Galerkin process (if pmat == mat the construction is only done once | |
| PC_MG_GALERKIN_NONE | - neither operator is computed via the Galerkin process, the user must provide the operator |
Users should never set PC_MG_GALERKIN_EXTERNAL, it is used by GAMG and ML