2: static char help[] = "Tests mirror boundary conditions in 3-d.\n\n";

  4:  #include <petscdm.h>
  5:  #include <petscdmda.h>

  7: int main(int argc,char **argv)
  8: {
 10:   PetscInt       M = 2, N = 3, P = 4,stencil_width = 1, dof = 1,m,n,p,xstart,ystart,zstart,i,j,k,c;
 11:   DM             da;
 12:   Vec            global,local;
 13:   PetscScalar    ****vglobal;
 14:   PetscViewer    sview;
 15:   PetscScalar    sum;

 17:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 18:   PetscOptionsGetInt(NULL,0,"-stencil_width",&stencil_width,0);
 19:   PetscOptionsGetInt(NULL,0,"-dof",&dof,0);

 21:   DMDACreate3d(PETSC_COMM_WORLD,DM_BOUNDARY_MIRROR,DM_BOUNDARY_MIRROR,DM_BOUNDARY_MIRROR,DMDA_STENCIL_STAR,M,N,P,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,dof,stencil_width,NULL,NULL,NULL,&da);
 22:   DMSetFromOptions(da);
 23:   DMSetUp(da);
 24:   DMDAGetCorners(da,&xstart,&ystart,&zstart,&m,&n,&p);

 26:   DMCreateGlobalVector(da,&global);
 27:   DMDAVecGetArrayDOF(da,global,&vglobal);
 28:   for (k=zstart; k<zstart+p; k++) {
 29:     for (j=ystart; j<ystart+n; j++) {
 30:       for (i=xstart; i<xstart+m; i++) {
 31:         for (c=0; c<dof; c++) {
 32:           vglobal[k][j][i][c] = 1000*k + 100*j + 10*i + c;
 33:         }
 34:       }
 35:     }
 36:   }
 37:   DMDAVecRestoreArrayDOF(da,global,&vglobal);

 39:   DMCreateLocalVector(da,&local);
 40:   DMGlobalToLocalBegin(da,global,ADD_VALUES,local);
 41:   DMGlobalToLocalEnd(da,global,ADD_VALUES,local);

 43:   VecSum(local,&sum);
 44:   PetscSynchronizedPrintf(PETSC_COMM_WORLD,"sum %g\n",(double)PetscRealPart(sum));
 45:   PetscSynchronizedFlush(PETSC_COMM_WORLD,stdout);
 46:   PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD,PETSC_COMM_SELF,&sview);
 47:   VecView(local,sview);
 48:   PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD,PETSC_COMM_SELF,&sview);
 49:   PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD);

 51:   DMDestroy(&da);
 52:   VecDestroy(&local);
 53:   VecDestroy(&global);

 55:   PetscFinalize();
 56:   return ierr;
 57: }

 59: /*TEST

 61:    test:

 63:    test:
 64:      suffix: 2
 65:      nsize: 3

 67: TEST*/