1c4762a1bSJed Brown static char help[] = "Tests saving DMDA vectors to files.\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown /* 4c4762a1bSJed Brown ex13.c reads in the DMDA and vector written by this program. 5c4762a1bSJed Brown */ 6c4762a1bSJed Brown 7c4762a1bSJed Brown #include <petscdm.h> 8c4762a1bSJed Brown #include <petscdmda.h> 9c4762a1bSJed Brown 10d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv) 11d71ae5a4SJacob Faibussowitsch { 12c4762a1bSJed Brown PetscMPIInt rank; 13c4762a1bSJed Brown PetscInt M = 10, N = 8, m = PETSC_DECIDE, n = PETSC_DECIDE, dof = 1; 14c4762a1bSJed Brown DM da; 15c4762a1bSJed Brown Vec local, global, natural; 16c4762a1bSJed Brown PetscScalar value; 17c4762a1bSJed Brown PetscViewer bviewer; 18c4762a1bSJed Brown 19327415f7SBarry Smith PetscFunctionBeginUser; 20*c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 219566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL)); 229566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL)); 239566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 249566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 259566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-dof", &dof, NULL)); 26c4762a1bSJed Brown 27c4762a1bSJed Brown /* Create distributed array and get vectors */ 289566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DMDA_STENCIL_BOX, M, N, m, n, dof, 1, NULL, NULL, &da)); 299566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 309566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 319566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da, &global)); 329566063dSJacob Faibussowitsch PetscCall(DMCreateLocalVector(da, &local)); 33c4762a1bSJed Brown 34c4762a1bSJed Brown value = -3.0; 359566063dSJacob Faibussowitsch PetscCall(VecSet(global, value)); 369566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local)); 379566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local)); 38c4762a1bSJed Brown 399566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 40c4762a1bSJed Brown value = rank + 1; 419566063dSJacob Faibussowitsch PetscCall(VecScale(local, value)); 429566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalBegin(da, local, ADD_VALUES, global)); 439566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalEnd(da, local, ADD_VALUES, global)); 44c4762a1bSJed Brown 459566063dSJacob Faibussowitsch PetscCall(DMDACreateNaturalVector(da, &natural)); 469566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalBegin(da, global, INSERT_VALUES, natural)); 479566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalEnd(da, global, INSERT_VALUES, natural)); 48c4762a1bSJed Brown 499566063dSJacob Faibussowitsch PetscCall(DMDASetFieldName(da, 0, "First field")); 509566063dSJacob Faibussowitsch /* PetscCall(VecView(global,PETSC_VIEWER_DRAW_WORLD)); */ 51c4762a1bSJed Brown 529566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "daoutput", FILE_MODE_WRITE, &bviewer)); 539566063dSJacob Faibussowitsch PetscCall(DMView(da, bviewer)); 549566063dSJacob Faibussowitsch PetscCall(VecView(global, bviewer)); 559566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&bviewer)); 56c4762a1bSJed Brown 57c4762a1bSJed Brown /* Free memory */ 589566063dSJacob Faibussowitsch PetscCall(VecDestroy(&local)); 599566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 609566063dSJacob Faibussowitsch PetscCall(VecDestroy(&natural)); 619566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 629566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 63b122ec5aSJacob Faibussowitsch return 0; 64c4762a1bSJed Brown } 65