1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests DMDAGlobalToNaturalAllCreate() using contour plotting for 2d DMDAs.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscdm.h> 5c4762a1bSJed Brown #include <petscdmda.h> 6c4762a1bSJed Brown #include <petscdraw.h> 7c4762a1bSJed Brown 8c4762a1bSJed Brown int main(int argc,char **argv) 9c4762a1bSJed Brown { 10c4762a1bSJed Brown PetscInt i,j,M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE; 11c4762a1bSJed Brown PetscMPIInt rank; 12c4762a1bSJed Brown PetscBool flg = PETSC_FALSE; 13c4762a1bSJed Brown DM da; 14c4762a1bSJed Brown PetscViewer viewer; 15c4762a1bSJed Brown Vec localall,global; 16c4762a1bSJed Brown PetscScalar value,*vlocal; 17c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE; 18c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX; 19c4762a1bSJed Brown VecScatter tolocalall,fromlocalall; 20c4762a1bSJed Brown PetscInt start,end; 21c4762a1bSJed Brown 22*327415f7SBarry Smith PetscFunctionBeginUser; 239566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 249566063dSJacob Faibussowitsch PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer)); 25c4762a1bSJed Brown 26c4762a1bSJed Brown /* Read options */ 279566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL)); 289566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL)); 299566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 309566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 319566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL)); 32c4762a1bSJed Brown if (flg) stype = DMDA_STENCIL_STAR; 33c4762a1bSJed Brown 34c4762a1bSJed Brown /* Create distributed array and get vectors */ 359566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,m,n,1,1,NULL,NULL,&da)); 369566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 379566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 38c4762a1bSJed Brown 399566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da,&global)); 409566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_SELF,M*N,&localall)); 41c4762a1bSJed Brown 429566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 439566063dSJacob Faibussowitsch PetscCall(VecGetOwnershipRange(global,&start,&end)); 44c4762a1bSJed Brown for (i=start; i<end; i++) { 45c4762a1bSJed Brown value = 5.0*rank; 469566063dSJacob Faibussowitsch PetscCall(VecSetValues(global,1,&i,&value,INSERT_VALUES)); 47c4762a1bSJed Brown } 489566063dSJacob Faibussowitsch PetscCall(VecView(global,viewer)); 49c4762a1bSJed Brown 50c4762a1bSJed Brown /* 51c4762a1bSJed Brown Create Scatter from global DMDA parallel vector to local vector that 52c4762a1bSJed Brown contains all entries 53c4762a1bSJed Brown */ 549566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalAllCreate(da,&tolocalall)); 559566063dSJacob Faibussowitsch PetscCall(DMDANaturalAllToGlobalCreate(da,&fromlocalall)); 56c4762a1bSJed Brown 579566063dSJacob Faibussowitsch PetscCall(VecScatterBegin(tolocalall,global,localall,INSERT_VALUES,SCATTER_FORWARD)); 589566063dSJacob Faibussowitsch PetscCall(VecScatterEnd(tolocalall,global,localall,INSERT_VALUES,SCATTER_FORWARD)); 59c4762a1bSJed Brown 609566063dSJacob Faibussowitsch PetscCall(VecGetArray(localall,&vlocal)); 61c4762a1bSJed Brown for (j=0; j<N; j++) { 62c4762a1bSJed Brown for (i=0; i<M; i++) { 63c4762a1bSJed Brown *vlocal++ += i + j*M; 64c4762a1bSJed Brown } 65c4762a1bSJed Brown } 669566063dSJacob Faibussowitsch PetscCall(VecRestoreArray(localall,&vlocal)); 67c4762a1bSJed Brown 68c4762a1bSJed Brown /* scatter back to global vector */ 699566063dSJacob Faibussowitsch PetscCall(VecScatterBegin(fromlocalall,localall,global,INSERT_VALUES,SCATTER_FORWARD)); 709566063dSJacob Faibussowitsch PetscCall(VecScatterEnd(fromlocalall,localall,global,INSERT_VALUES,SCATTER_FORWARD)); 71c4762a1bSJed Brown 729566063dSJacob Faibussowitsch PetscCall(VecView(global,viewer)); 73c4762a1bSJed Brown 74c4762a1bSJed Brown /* Free memory */ 759566063dSJacob Faibussowitsch PetscCall(VecScatterDestroy(&tolocalall)); 769566063dSJacob Faibussowitsch PetscCall(VecScatterDestroy(&fromlocalall)); 779566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 789566063dSJacob Faibussowitsch PetscCall(VecDestroy(&localall)); 799566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 809566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 819566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 82b122ec5aSJacob Faibussowitsch return 0; 83c4762a1bSJed Brown } 84c4762a1bSJed Brown 85c4762a1bSJed Brown /*TEST 86c4762a1bSJed Brown 87c4762a1bSJed Brown build: 88c4762a1bSJed Brown requires: !complex 89c4762a1bSJed Brown 90c4762a1bSJed Brown test: 91c4762a1bSJed Brown nsize: 3 92c4762a1bSJed Brown 93c4762a1bSJed Brown TEST*/ 94