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