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: }