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