PCMGalerkinType#

Determines if the coarse grid operators are computed via the Galerkin process

Synopsis#

typedef enum {
  PC_MG_GALERKIN_BOTH,
  PC_MG_GALERKIN_PMAT,
  PC_MG_GALERKIN_MAT,
  PC_MG_GALERKIN_NONE,
  PC_MG_GALERKIN_EXTERNAL
} PCMGGalerkinType;

Values#

  • 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

Note#

Users should never set PC_MG_GALERKIN_EXTERNAL, it is used by PCHYPRE and PCML

See Also#

Preconditioners, PCMG, PC, PCMGSetCycleType()

Level#

beginner

Location#

include/petscpctypes.h

Index of all PC routines
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Index of all manual pages