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 PetscErrorCode ierr; 13 PetscBool flg = PETSC_FALSE; 14 DM da; 15 PetscViewer viewer; 16 Vec local,global; 17 PetscScalar value; 18 DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE; 19 DMDAStencilType stype = DMDA_STENCIL_BOX; 20 PetscScalar *lv; 21 22 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 23 ierr = PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer);CHKERRQ(ierr); 24 25 /* Read options */ 26 ierr = PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);CHKERRQ(ierr); 27 ierr = PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);CHKERRQ(ierr); 28 ierr = PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL);CHKERRQ(ierr); 29 if (flg) stype = DMDA_STENCIL_STAR; 30 31 /* Create distributed array and get vectors */ 32 ierr = DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da);CHKERRQ(ierr); 33 ierr = DMSetFromOptions(da);CHKERRQ(ierr); 34 ierr = DMSetUp(da);CHKERRQ(ierr); 35 ierr = DMCreateGlobalVector(da,&global);CHKERRQ(ierr); 36 ierr = DMCreateLocalVector(da,&local);CHKERRQ(ierr); 37 38 value = -3.0; 39 ierr = VecSet(global,value);CHKERRQ(ierr); 40 ierr = DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 41 ierr = DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 42 43 ierr = DMDASetElementType(da,DMDA_ELEMENT_P1);CHKERRQ(ierr); 44 ierr = DMDAGetElements(da,&ne,&nc,&e);CHKERRQ(ierr); 45 ierr = VecGetArray(local,&lv);CHKERRQ(ierr); 46 for (i=0; i<ne; i++) { 47 ierr = PetscSynchronizedPrintf(PETSC_COMM_WORLD,"i %D e[3*i] %D %D %D\n",i,e[3*i],e[3*i+1],e[3*i+2]);CHKERRQ(ierr); 48 lv[e[3*i]] = i; 49 } 50 ierr = PetscSynchronizedFlush(PETSC_COMM_WORLD,stdout);CHKERRQ(ierr); 51 ierr = VecRestoreArray(local,&lv);CHKERRQ(ierr); 52 ierr = DMDARestoreElements(da,&ne,&nc,&e);CHKERRQ(ierr); 53 54 ierr = DMLocalToGlobalBegin(da,local,ADD_VALUES,global);CHKERRQ(ierr); 55 ierr = DMLocalToGlobalEnd(da,local,ADD_VALUES,global);CHKERRQ(ierr); 56 57 ierr = DMView(da,viewer);CHKERRQ(ierr); 58 ierr = VecView(global,viewer);CHKERRQ(ierr); 59 60 /* Free memory */ 61 ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr); 62 ierr = VecDestroy(&local);CHKERRQ(ierr); 63 ierr = VecDestroy(&global);CHKERRQ(ierr); 64 ierr = DMDestroy(&da);CHKERRQ(ierr); 65 ierr = PetscFinalize(); 66 return ierr; 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