Computes relaxation (SOR, Gauss-Seidel) sweeps.


#include "petscmat.h" 
PetscErrorCode PETSCMAT_DLLEXPORT MatPBRelax(Mat mat,Vec b,PetscReal omega,MatSORType flag,PetscReal shift,PetscInt its,PetscInt lits,Vec x)
Collective on Mat and Vec

See MatRelax() for usage

For multi-component PDEs where the Jacobian is stored in a point block format (with the PETSc BAIJ matrix formats) the relaxation is done one point block at a time. That is, the small (for example, 4 by 4) blocks along the diagonal are solved simultaneously (that is a 4 by 4 linear solve is done) to update all the values at a point.

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