Actual source code: ex40.c

petsc-3.8.4 2018-03-24
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  2: static char help[] = "Tests mirror boundary conditions in 2-d.\n\n";

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

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

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

 19:   DMDACreate2d(PETSC_COMM_WORLD,DM_BOUNDARY_MIRROR,DM_BOUNDARY_MIRROR,DMDA_STENCIL_STAR,M,N,PETSC_DECIDE,PETSC_DECIDE,dof,stencil_width,NULL,NULL,&da);
 20:   DMSetFromOptions(da);
 21:   DMSetUp(da);
 22:   DMDAGetCorners(da,&xstart,&ystart,0,&m,&n,0);

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

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

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

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

 48:   PetscFinalize();
 49:   return ierr;
 50: }