Actual source code: ex7.c


  2: static char help[] = "Tests MatILUFactorSymbolic() on matrix with missing diagonal.\n\n";

  4: #include <petscmat.h>
  5: #include <petscpc.h>

  7: int main(int argc,char **args)
  8: {
  9:   Mat            C,A;
 10:   PetscInt       i,j;
 11:   PetscScalar    v;
 12:   PC             pc;
 13:   Vec            xtmp;

 15:   PetscInitialize(&argc,&args,(char*)0,help);
 16:   MatCreate(PETSC_COMM_WORLD,&C);
 17:   MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,3,3);
 18:   MatSetFromOptions(C);
 19:   MatSetUp(C);
 20:   VecCreateSeq(PETSC_COMM_WORLD,3,&xtmp);
 21:   i    = 0; j = 0; v = 4;
 22:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 23:   i    = 0; j = 2; v = 1;
 24:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 25:   i    = 1; j = 0; v = 1;
 26:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 27:   i    = 1; j = 1; v = 4;
 28:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 29:   i    = 2; j = 1; v = 1;
 30:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);

 32:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 33:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);

 35:   MatView(C,PETSC_VIEWER_STDOUT_WORLD);
 36:   PCCreate(PETSC_COMM_WORLD,&pc);
 37:   PCSetFromOptions(pc);
 38:   PCSetOperators(pc,C,C);
 39:   PCSetUp(pc);
 40:   PCFactorGetMatrix(pc,&A);
 41:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 43:   PCDestroy(&pc);
 44:   VecDestroy(&xtmp);
 45:   MatDestroy(&C);

 47:   PetscFinalize();
 48:   return 0;
 49: }