2: static char help[] = "VecView() with a DMDA1d vector and draw viewer.\n\n";


  5:  #include <petscdm.h>
  6:  #include <petscdmda.h>
  7:  #include <petscao.h>

  9: PetscErrorCode apply(void *ctx,PetscInt n,const PetscScalar *x,PetscScalar *y)
 10: {
 11:   PetscInt i;

 13:   for (i=0; i<n; i++) {y[3*i] = x[i]; y[3*i+1] = x[i]*x[i]; y[3*i+2] = x[i]*x[i]*x[i];}
 14:   return 0;
 15: }

 17: int main(int argc,char **argv)
 18: {
 20:   DM             da;
 21:   Vec            global;
 22:   PF             pf;

 24:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 25:   DMDACreate1d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,10,3,1,NULL,&da);
 26:   DMSetFromOptions(da);
 27:   DMSetUp(da);
 28:   DMCreateGlobalVector(da,&global);
 29:   PFCreate(PETSC_COMM_WORLD,1,3,&pf);
 30:   PFSet(pf,apply,NULL,NULL,NULL,NULL);
 31:   PFApplyVec(pf,NULL,global);
 32:   PFDestroy(&pf);
 33:   VecView(global,PETSC_VIEWER_DRAW_WORLD);
 34:   VecDestroy(&global);
 35:   DMDestroy(&da);
 36:   PetscFinalize();
 37:   return ierr;
 38: }


 41: /*TEST

 43:    test:
 44:       nsize: 2
 45:       requires: x

 47: TEST*/