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 PetscErrorCode ierr; 16 DM da; 17 Vec local,global,natural; 18 PetscScalar value; 19 PetscViewer bviewer; 20 21 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 22 ierr = PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);CHKERRQ(ierr); 23 ierr = PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);CHKERRQ(ierr); 24 ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 25 ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 26 ierr = PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);CHKERRQ(ierr); 27 28 /* Create distributed array and get vectors */ 29 ierr = DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,N,m,n,dof,1,NULL,NULL,&da);CHKERRQ(ierr); 30 ierr = DMSetFromOptions(da);CHKERRQ(ierr); 31 ierr = DMSetUp(da);CHKERRQ(ierr); 32 ierr = DMCreateGlobalVector(da,&global);CHKERRQ(ierr); 33 ierr = DMCreateLocalVector(da,&local);CHKERRQ(ierr); 34 35 value = -3.0; 36 ierr = VecSet(global,value);CHKERRQ(ierr); 37 ierr = DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 38 ierr = DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 39 40 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 41 value = rank+1; 42 ierr = VecScale(local,value);CHKERRQ(ierr); 43 ierr = DMLocalToGlobalBegin(da,local,ADD_VALUES,global);CHKERRQ(ierr); 44 ierr = DMLocalToGlobalEnd(da,local,ADD_VALUES,global);CHKERRQ(ierr); 45 46 ierr = DMDACreateNaturalVector(da,&natural);CHKERRQ(ierr); 47 ierr = DMDAGlobalToNaturalBegin(da,global,INSERT_VALUES,natural);CHKERRQ(ierr); 48 ierr = DMDAGlobalToNaturalEnd(da,global,INSERT_VALUES,natural);CHKERRQ(ierr); 49 50 ierr = DMDASetFieldName(da,0,"First field");CHKERRQ(ierr); 51 /* ierr = VecView(global,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr); */ 52 53 ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"daoutput",FILE_MODE_WRITE,&bviewer);CHKERRQ(ierr); 54 ierr = DMView(da,bviewer);CHKERRQ(ierr); 55 ierr = VecView(global,bviewer);CHKERRQ(ierr); 56 ierr = PetscViewerDestroy(&bviewer);CHKERRQ(ierr); 57 58 /* Free memory */ 59 ierr = VecDestroy(&local);CHKERRQ(ierr); 60 ierr = VecDestroy(&global);CHKERRQ(ierr); 61 ierr = VecDestroy(&natural);CHKERRQ(ierr); 62 ierr = DMDestroy(&da);CHKERRQ(ierr); 63 ierr = PetscFinalize(); 64 return ierr; 65 } 66 67