Actual source code: ex10.c

  1: /*$Id: ex10.c,v 1.20 2001/08/07 03:04:42 balay Exp $*/

  3: static char help[] = "Tests various 1-dimensional DA routines.nn";

 5:  #include petscda.h
 6:  #include petscsys.h

  8: int main(int argc,char **argv)
  9: {
 10:   int         M = 13,ierr,dof=1,s=1,wrap=0,i,n,j;
 11:   DA          da;
 12:   PetscViewer viewer;
 13:   Vec         local,locala,global,coors;
 14:   PetscScalar *x,*alocal;
 15:   PetscDraw   draw;
 16:   char        fname[16];

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

 20:   /* Create viewers */
 21:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",PETSC_DECIDE,PETSC_DECIDE,600,200,&viewer);
 22:   PetscViewerDrawGetDraw(viewer,0,&draw);
 23:   PetscDrawSetDoubleBuffer(draw);

 25:   /* Read options */
 26:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 27:   PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);
 28:   PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);
 29:   PetscOptionsGetInt(PETSC_NULL,"-periodic",&wrap,PETSC_NULL);

 31:   /* Create distributed array and get vectors */
 32:   DACreate1d(PETSC_COMM_WORLD,(DAPeriodicType)wrap,M,dof,s,PETSC_NULL,&da);
 33:   DASetUniformCoordinates(da,0.0,1.0,0.0,0.0,0.0,0.0);
 34:   for (i=0; i<dof; i++) {
 35:     sprintf(fname,"Field %d",i);
 36:     DASetFieldName(da,i,fname);
 37:   }

 39:   DAView(da,viewer);
 40:   DACreateGlobalVector(da,&global);
 41:   DACreateLocalVector(da,&local);
 42:   DACreateLocalVector(da,&locala);
 43:   DAGetCoordinates(da,&coors);
 44:   VecGetArray(coors,&x);

 46:   /* Set values into global vectors */
 47:   VecGetArray(global,&alocal);
 48:   VecGetLocalSize(global,&n);
 49:   n    = n/dof;
 50:   for (j=0; j<dof; j++) {
 51:     for (i=0; i<n; i++) {
 52:       alocal[j+dof*i] = PetscSinScalar(2*PETSC_PI*(j+1)*x[i]);
 53:     }
 54:   }
 55:   VecRestoreArray(global,&alocal);
 56:   VecRestoreArray(coors,&x);

 58:   VecView(global,viewer);

 60:   /* Send ghost points to local vectors */
 61:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,locala);
 62:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,locala);

 64:   /* Free memory */
 65:   PetscViewerDestroy(viewer);
 66:   VecDestroy(global);
 67:   VecDestroy(local);
 68:   VecDestroy(locala);
 69:   DADestroy(da);
 70:   PetscFinalize();
 71:   return 0;
 72: }
 73: