1 2 static char help[] = "Tests saving DMDA vectors to files.\n\n"; 3 4 /* 5 ex13.c reads in the DMDA and vector written by this program. 6 */ 7 8 #include <petscdm.h> 9 #include <petscdmda.h> 10 11 int main(int argc,char **argv) 12 { 13 PetscMPIInt rank; 14 PetscInt M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE, dof = 1; 15 DM da; 16 Vec local,global,natural; 17 PetscScalar value; 18 PetscViewer bviewer; 19 20 CHKERRQ(PetscInitialize(&argc,&argv,(char*)0,help)); 21 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL)); 22 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL)); 23 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 24 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 25 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL)); 26 27 /* Create distributed array and get vectors */ 28 CHKERRQ(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,N,m,n,dof,1,NULL,NULL,&da)); 29 CHKERRQ(DMSetFromOptions(da)); 30 CHKERRQ(DMSetUp(da)); 31 CHKERRQ(DMCreateGlobalVector(da,&global)); 32 CHKERRQ(DMCreateLocalVector(da,&local)); 33 34 value = -3.0; 35 CHKERRQ(VecSet(global,value)); 36 CHKERRQ(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 37 CHKERRQ(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 38 39 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 40 value = rank+1; 41 CHKERRQ(VecScale(local,value)); 42 CHKERRQ(DMLocalToGlobalBegin(da,local,ADD_VALUES,global)); 43 CHKERRQ(DMLocalToGlobalEnd(da,local,ADD_VALUES,global)); 44 45 CHKERRQ(DMDACreateNaturalVector(da,&natural)); 46 CHKERRQ(DMDAGlobalToNaturalBegin(da,global,INSERT_VALUES,natural)); 47 CHKERRQ(DMDAGlobalToNaturalEnd(da,global,INSERT_VALUES,natural)); 48 49 CHKERRQ(DMDASetFieldName(da,0,"First field")); 50 /* CHKERRQ(VecView(global,PETSC_VIEWER_DRAW_WORLD)); */ 51 52 CHKERRQ(PetscViewerBinaryOpen(PETSC_COMM_WORLD,"daoutput",FILE_MODE_WRITE,&bviewer)); 53 CHKERRQ(DMView(da,bviewer)); 54 CHKERRQ(VecView(global,bviewer)); 55 CHKERRQ(PetscViewerDestroy(&bviewer)); 56 57 /* Free memory */ 58 CHKERRQ(VecDestroy(&local)); 59 CHKERRQ(VecDestroy(&global)); 60 CHKERRQ(VecDestroy(&natural)); 61 CHKERRQ(DMDestroy(&da)); 62 CHKERRQ(PetscFinalize()); 63 return 0; 64 } 65