1 2 static char help[] = "Tests DMDAGetElements() and VecView() contour plotting for 2d DMDAs.\n\n"; 3 4 #include <petscdm.h> 5 #include <petscdmda.h> 6 #include <petscdraw.h> 7 8 int main(int argc,char **argv) 9 { 10 PetscInt M = 10,N = 8,ne,nc,i; 11 const PetscInt *e; 12 PetscBool flg = PETSC_FALSE; 13 DM da; 14 PetscViewer viewer; 15 Vec local,global; 16 PetscScalar value; 17 DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE; 18 DMDAStencilType stype = DMDA_STENCIL_BOX; 19 PetscScalar *lv; 20 21 PetscFunctionBeginUser; 22 PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 23 PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer)); 24 25 /* Read options */ 26 PetscCall(PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL)); 27 PetscCall(PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL)); 28 PetscCall(PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL)); 29 if (flg) stype = DMDA_STENCIL_STAR; 30 31 /* Create distributed array and get vectors */ 32 PetscCall(DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da)); 33 PetscCall(DMSetFromOptions(da)); 34 PetscCall(DMSetUp(da)); 35 PetscCall(DMCreateGlobalVector(da,&global)); 36 PetscCall(DMCreateLocalVector(da,&local)); 37 38 value = -3.0; 39 PetscCall(VecSet(global,value)); 40 PetscCall(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 41 PetscCall(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 42 43 PetscCall(DMDASetElementType(da,DMDA_ELEMENT_P1)); 44 PetscCall(DMDAGetElements(da,&ne,&nc,&e)); 45 PetscCall(VecGetArray(local,&lv)); 46 for (i=0; i<ne; i++) { 47 PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD,"i %" PetscInt_FMT " e[3*i] %" PetscInt_FMT " %" PetscInt_FMT " %" PetscInt_FMT "\n",i,e[3*i],e[3*i+1],e[3*i+2])); 48 lv[e[3*i]] = i; 49 } 50 PetscCall(PetscSynchronizedFlush(PETSC_COMM_WORLD,stdout)); 51 PetscCall(VecRestoreArray(local,&lv)); 52 PetscCall(DMDARestoreElements(da,&ne,&nc,&e)); 53 54 PetscCall(DMLocalToGlobalBegin(da,local,ADD_VALUES,global)); 55 PetscCall(DMLocalToGlobalEnd(da,local,ADD_VALUES,global)); 56 57 PetscCall(DMView(da,viewer)); 58 PetscCall(VecView(global,viewer)); 59 60 /* Free memory */ 61 PetscCall(PetscViewerDestroy(&viewer)); 62 PetscCall(VecDestroy(&local)); 63 PetscCall(VecDestroy(&global)); 64 PetscCall(DMDestroy(&da)); 65 PetscCall(PetscFinalize()); 66 return 0; 67 } 68 69 /*TEST 70 71 test: 72 requires: x 73 74 test: 75 suffix: 2 76 nsize: 2 77 requires: x 78 79 TEST*/ 80