MatSORType

What type of (S)SOR to perform

Synopsis

typedef enum {
  SOR_FORWARD_SWEEP         = 1,
  SOR_BACKWARD_SWEEP        = 2,
  SOR_SYMMETRIC_SWEEP       = 3,
  SOR_LOCAL_FORWARD_SWEEP   = 4,
  SOR_LOCAL_BACKWARD_SWEEP  = 8,
  SOR_LOCAL_SYMMETRIC_SWEEP = 12,
  SOR_ZERO_INITIAL_GUESS    = 16,
  SOR_EISENSTAT             = 32,
  SOR_APPLY_UPPER           = 64,
  SOR_APPLY_LOWER           = 128
} MatSORType;

Values

• SOR_FORWARD_SWEEP - do a sweep from the first row of the matrix to the last

• SOR_BACKWARD_SWEEP - do a sweep from the last row to the first

• SOR_SYMMETRIC_SWEEP - do a sweep from the first row to the last and then back to the first

• SOR_LOCAL_FORWARD_SWEEP - each MPI process does its own forward sweep with no communication

• SOR_LOCAL_BACKWARD_SWEEP - each MPI process does its own backward sweep with no communication

• SOR_LOCAL_SYMMETRIC_SWEEP - each MPI process does its own symmetric sweep with no communication

• SOR_ZERO_INITIAL_GUESS - indicates the initial solution is zero so the sweep can avoid unneeded computation

• SOR_EISENSTAT - apply the Eisentat application of SOR, see PCEISENSTAT

• SOR_APPLY_UPPER - multiply by the upper triangular portion of the matrix

• SOR_APPLY_LOWER - multiply by the lower triangular portion of the matrix

Note

These may be bitwise ORd together

Developer Note

Since MatSORType may be bitwise ORd together, so do not change the numerical values below

See Also

Matrices, MatSOR()

Level

beginner

Location

include/petscmat.h

Examples

src/tao/pde_constrained/tutorials/hyperbolic.c
src/tao/pde_constrained/tutorials/parabolic.c

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