1 static char help[] = "Tests for creation of submeshes\n\n"; 2 3 #include <petscdmplex.h> 4 5 PetscErrorCode CreateMesh(MPI_Comm comm, DM *dm) 6 { 7 PetscErrorCode ierr; 8 9 PetscFunctionBegin; 10 ierr = DMCreate(comm, dm);CHKERRQ(ierr); 11 ierr = DMSetType(*dm, DMPLEX);CHKERRQ(ierr); 12 ierr = DMSetFromOptions(*dm);CHKERRQ(ierr); 13 ierr = DMViewFromOptions(*dm, NULL, "-dm_view");CHKERRQ(ierr); 14 PetscFunctionReturn(0); 15 } 16 17 PetscErrorCode CreateSubmesh(DM dm, PetscBool start, DM *subdm) 18 { 19 DMLabel label, map; 20 PetscInt cStart, cEnd, cStartSub, cEndSub, c; 21 PetscErrorCode ierr; 22 23 PetscFunctionBegin; 24 ierr = DMPlexGetHeightStratum(dm, 0, &cStart, &cEnd);CHKERRQ(ierr); 25 ierr = DMCreateLabel(dm, "cells");CHKERRQ(ierr); 26 ierr = DMGetLabel(dm, "cells", &label);CHKERRQ(ierr); 27 ierr = DMLabelClearStratum(label, 1);CHKERRQ(ierr); 28 if (start) {cStartSub = cStart; cEndSub = cEnd/2;} 29 else {cStartSub = cEnd/2; cEndSub = cEnd;} 30 for (c = cStartSub; c < cEndSub; ++c) {ierr = DMLabelSetValue(label, c, 1);CHKERRQ(ierr);} 31 ierr = DMPlexFilter(dm, label, 1, subdm);CHKERRQ(ierr); 32 ierr = PetscObjectSetName((PetscObject) *subdm, "Submesh");CHKERRQ(ierr); 33 ierr = DMViewFromOptions(*subdm, NULL, "-dm_view");CHKERRQ(ierr); 34 ierr = DMPlexGetSubpointMap(*subdm, &map);CHKERRQ(ierr); 35 ierr = DMLabelView(map, PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 36 PetscFunctionReturn(0); 37 } 38 39 int main(int argc, char **argv) 40 { 41 DM dm, subdm; 42 PetscErrorCode ierr; 43 44 ierr = PetscInitialize(&argc, &argv, NULL, help);if (ierr) return ierr; 45 ierr = CreateMesh(PETSC_COMM_WORLD, &dm);CHKERRQ(ierr); 46 ierr = CreateSubmesh(dm, PETSC_TRUE, &subdm);CHKERRQ(ierr); 47 ierr = DMSetFromOptions(subdm);CHKERRQ(ierr); 48 ierr = DMDestroy(&subdm);CHKERRQ(ierr); 49 ierr = CreateSubmesh(dm, PETSC_FALSE, &subdm);CHKERRQ(ierr); 50 ierr = DMSetFromOptions(subdm);CHKERRQ(ierr); 51 ierr = DMDestroy(&subdm);CHKERRQ(ierr); 52 ierr = DMDestroy(&dm);CHKERRQ(ierr); 53 ierr = PetscFinalize(); 54 return ierr; 55 } 56 57 /*TEST 58 59 test: 60 suffix: 0 61 requires: triangle 62 args: -dm_coord_space 0 -dm_view ascii::ascii_info_detail -dm_plex_check_all 63 64 TEST*/ 65