Actual source code: ex7.c

  1: /*$Id: ex7.c,v 1.13 2001/08/07 03:03:43 balay Exp $*/

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

 5:  #include petscmat.h
 6:  #include petscpc.h

 10: int main(int argc,char **args)
 11: {
 12:   Mat         C,A;
 13:   int         i,j,ierr;
 14:   PetscScalar v;
 15:   PC          pc;
 16:   Vec         xtmp;

 18:   PetscInitialize(&argc,&args,(char *)0,help);

 20:   MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,3,3,&C);
 21:   MatSetFromOptions(C);
 22:   VecCreateSeq(PETSC_COMM_WORLD,3,&xtmp);
 23:   i = 0; j = 0; v = 4;
 24:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 25:   i = 0; j = 2; v = 1;
 26:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 27:   i = 1; j = 0; v = 1;
 28:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 29:   i = 1; j = 1; v = 4;
 30:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
 31:   i = 2; j = 1; v = 1;
 32:   MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);

 34:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 35:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);

 37:   MatView(C,PETSC_VIEWER_STDOUT_WORLD);
 38:   PCCreate(PETSC_COMM_WORLD,&pc);
 39:   PCSetFromOptions(pc);
 40:   PCSetOperators(pc,C,C,DIFFERENT_NONZERO_PATTERN);
 41:   PCSetVector(pc,xtmp);
 42:   PCSetUp(pc);
 43:   PCGetFactoredMatrix(pc,&A);
 44:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 46:   PCDestroy(pc);
 47:   VecDestroy(xtmp);
 48:   MatDestroy(C);


 51:   PetscFinalize();
 52:   return 0;
 53: }

 55: