1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Tests saving DMDA vectors to files.\n\n"; 3*c4762a1bSJed Brown 4*c4762a1bSJed Brown /* 5*c4762a1bSJed Brown ex13.c reads in the DMDA and vector written by this program. 6*c4762a1bSJed Brown */ 7*c4762a1bSJed Brown 8*c4762a1bSJed Brown #include <petscdm.h> 9*c4762a1bSJed Brown #include <petscdmda.h> 10*c4762a1bSJed Brown 11*c4762a1bSJed Brown int main(int argc,char **argv) 12*c4762a1bSJed Brown { 13*c4762a1bSJed Brown PetscMPIInt rank; 14*c4762a1bSJed Brown PetscInt M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE, dof = 1; 15*c4762a1bSJed Brown PetscErrorCode ierr; 16*c4762a1bSJed Brown DM da; 17*c4762a1bSJed Brown Vec local,global,natural; 18*c4762a1bSJed Brown PetscScalar value; 19*c4762a1bSJed Brown PetscViewer bviewer; 20*c4762a1bSJed Brown 21*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 22*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);CHKERRQ(ierr); 23*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);CHKERRQ(ierr); 24*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 25*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 26*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);CHKERRQ(ierr); 27*c4762a1bSJed Brown 28*c4762a1bSJed Brown /* Create distributed array and get vectors */ 29*c4762a1bSJed Brown 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*c4762a1bSJed Brown ierr = DMSetFromOptions(da);CHKERRQ(ierr); 31*c4762a1bSJed Brown ierr = DMSetUp(da);CHKERRQ(ierr); 32*c4762a1bSJed Brown ierr = DMCreateGlobalVector(da,&global);CHKERRQ(ierr); 33*c4762a1bSJed Brown ierr = DMCreateLocalVector(da,&local);CHKERRQ(ierr); 34*c4762a1bSJed Brown 35*c4762a1bSJed Brown value = -3.0; 36*c4762a1bSJed Brown ierr = VecSet(global,value);CHKERRQ(ierr); 37*c4762a1bSJed Brown ierr = DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 38*c4762a1bSJed Brown ierr = DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 39*c4762a1bSJed Brown 40*c4762a1bSJed Brown ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 41*c4762a1bSJed Brown value = rank+1; 42*c4762a1bSJed Brown ierr = VecScale(local,value);CHKERRQ(ierr); 43*c4762a1bSJed Brown ierr = DMLocalToGlobalBegin(da,local,ADD_VALUES,global);CHKERRQ(ierr); 44*c4762a1bSJed Brown ierr = DMLocalToGlobalEnd(da,local,ADD_VALUES,global);CHKERRQ(ierr); 45*c4762a1bSJed Brown 46*c4762a1bSJed Brown ierr = DMDACreateNaturalVector(da,&natural);CHKERRQ(ierr); 47*c4762a1bSJed Brown ierr = DMDAGlobalToNaturalBegin(da,global,INSERT_VALUES,natural);CHKERRQ(ierr); 48*c4762a1bSJed Brown ierr = DMDAGlobalToNaturalEnd(da,global,INSERT_VALUES,natural);CHKERRQ(ierr); 49*c4762a1bSJed Brown 50*c4762a1bSJed Brown ierr = DMDASetFieldName(da,0,"First field");CHKERRQ(ierr); 51*c4762a1bSJed Brown /* ierr = VecView(global,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr); */ 52*c4762a1bSJed Brown 53*c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"daoutput",FILE_MODE_WRITE,&bviewer);CHKERRQ(ierr); 54*c4762a1bSJed Brown ierr = DMView(da,bviewer);CHKERRQ(ierr); 55*c4762a1bSJed Brown ierr = VecView(global,bviewer);CHKERRQ(ierr); 56*c4762a1bSJed Brown ierr = PetscViewerDestroy(&bviewer);CHKERRQ(ierr); 57*c4762a1bSJed Brown 58*c4762a1bSJed Brown /* Free memory */ 59*c4762a1bSJed Brown ierr = VecDestroy(&local);CHKERRQ(ierr); 60*c4762a1bSJed Brown ierr = VecDestroy(&global);CHKERRQ(ierr); 61*c4762a1bSJed Brown ierr = VecDestroy(&natural);CHKERRQ(ierr); 62*c4762a1bSJed Brown ierr = DMDestroy(&da);CHKERRQ(ierr); 63*c4762a1bSJed Brown ierr = PetscFinalize(); 64*c4762a1bSJed Brown return ierr; 65*c4762a1bSJed Brown } 66*c4762a1bSJed Brown 67