1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests saving DMDA vectors to files.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown /* 5c4762a1bSJed Brown ex13.c reads in the DMDA and vector written by this program. 6c4762a1bSJed Brown */ 7c4762a1bSJed Brown 8c4762a1bSJed Brown #include <petscdm.h> 9c4762a1bSJed Brown #include <petscdmda.h> 10c4762a1bSJed Brown 11c4762a1bSJed Brown int main(int argc,char **argv) 12c4762a1bSJed Brown { 13c4762a1bSJed Brown PetscMPIInt rank; 14c4762a1bSJed Brown PetscInt M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE, dof = 1; 15c4762a1bSJed Brown DM da; 16c4762a1bSJed Brown Vec local,global,natural; 17c4762a1bSJed Brown PetscScalar value; 18c4762a1bSJed Brown PetscViewer bviewer; 19c4762a1bSJed Brown 20*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 21*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL)); 22*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL)); 23*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 24*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 25*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL)); 26c4762a1bSJed Brown 27c4762a1bSJed Brown /* Create distributed array and get vectors */ 28*9566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,N,m,n,dof,1,NULL,NULL,&da)); 29*9566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 30*9566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 31*9566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da,&global)); 32*9566063dSJacob Faibussowitsch PetscCall(DMCreateLocalVector(da,&local)); 33c4762a1bSJed Brown 34c4762a1bSJed Brown value = -3.0; 35*9566063dSJacob Faibussowitsch PetscCall(VecSet(global,value)); 36*9566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 37*9566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 38c4762a1bSJed Brown 39*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 40c4762a1bSJed Brown value = rank+1; 41*9566063dSJacob Faibussowitsch PetscCall(VecScale(local,value)); 42*9566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalBegin(da,local,ADD_VALUES,global)); 43*9566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalEnd(da,local,ADD_VALUES,global)); 44c4762a1bSJed Brown 45*9566063dSJacob Faibussowitsch PetscCall(DMDACreateNaturalVector(da,&natural)); 46*9566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalBegin(da,global,INSERT_VALUES,natural)); 47*9566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalEnd(da,global,INSERT_VALUES,natural)); 48c4762a1bSJed Brown 49*9566063dSJacob Faibussowitsch PetscCall(DMDASetFieldName(da,0,"First field")); 50*9566063dSJacob Faibussowitsch /* PetscCall(VecView(global,PETSC_VIEWER_DRAW_WORLD)); */ 51c4762a1bSJed Brown 52*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,"daoutput",FILE_MODE_WRITE,&bviewer)); 53*9566063dSJacob Faibussowitsch PetscCall(DMView(da,bviewer)); 54*9566063dSJacob Faibussowitsch PetscCall(VecView(global,bviewer)); 55*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&bviewer)); 56c4762a1bSJed Brown 57c4762a1bSJed Brown /* Free memory */ 58*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&local)); 59*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 60*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&natural)); 61*9566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 62*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 63b122ec5aSJacob Faibussowitsch return 0; 64c4762a1bSJed Brown } 65