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.nn";

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

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

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

 18:   MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,3,3,&C);
 19:   MatSetFromOptions(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,DIFFERENT_NONZERO_PATTERN);
 39:   PCSetVector(pc,xtmp);
 40:   PCSetUp(pc);
 41:   PCGetFactoredMatrix(pc,&A);
 42:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

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


 49:   PetscFinalize();
 50:   return 0;
 51: }

 53: