Date: 2013-07-02T14:46:21+00:00

Actual source code: ex40.c
petsc-3.4.2 2013-07-02

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

      4: #include <petscdmda.h>

      8: int main(int argc,char **argv)
      9: {
     11:   PetscInt       M = -8, N = -8,stencil_width = 1, dof = 1,m,n,xstart,ystart,i,j,c;
     12:   DM             da;
     13:   Vec            global,local;
     14:   PetscScalar    ***vglobal;

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

     19:   PetscOptionsGetInt(0,"-stencil_width",&stencil_width,0);
     20:   PetscOptionsGetInt(0,"-dof",&dof,0);

     22:   DMDACreate2d(PETSC_COMM_WORLD,DMDA_BOUNDARY_MIRROR,DMDA_BOUNDARY_MIRROR,DMDA_STENCIL_STAR,M,N,PETSC_DECIDE,PETSC_DECIDE,dof,stencil_width,NULL,NULL,&da);
     23:   DMDAGetCorners(da,&xstart,&ystart,0,&m,&n,0);

     25:   DMCreateGlobalVector(da,&global);
     26:   DMDAVecGetArrayDOF(da,global,&vglobal);
     27:   for (j=ystart; j<ystart+n; j++) {
     28:     for (i=xstart; i<xstart+m; i++) {
     29:       for (c=0; c<dof; c++) {
     30:         vglobal[j][i][c] = 100*j + 10*(i+1) + c;
     31:       }
     32:     }
     33:   }
     34:   DMDAVecRestoreArrayDOF(da,global,&vglobal);

     36:   DMCreateLocalVector(da,&local);
     37:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
     38:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

     40:   PetscSequentialPhaseBegin(PETSC_COMM_WORLD,1);
     41:   VecView(local,PETSC_VIEWER_STDOUT_SELF);
     42:   PetscSequentialPhaseEnd(PETSC_COMM_WORLD,1);
     43:   VecView(global,PETSC_VIEWER_STDOUT_WORLD);

     45:   DMDestroy(&da);
     46:   VecDestroy(&local);
     47:   VecDestroy(&global);

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