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 11*d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv) 12*d71ae5a4SJacob Faibussowitsch { 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 20327415f7SBarry Smith PetscFunctionBeginUser; 219566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 229566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL)); 239566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL)); 249566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 259566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 269566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-dof", &dof, NULL)); 27c4762a1bSJed Brown 28c4762a1bSJed Brown /* Create distributed array and get vectors */ 299566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DMDA_STENCIL_BOX, M, N, m, n, dof, 1, NULL, NULL, &da)); 309566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 319566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 329566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da, &global)); 339566063dSJacob Faibussowitsch PetscCall(DMCreateLocalVector(da, &local)); 34c4762a1bSJed Brown 35c4762a1bSJed Brown value = -3.0; 369566063dSJacob Faibussowitsch PetscCall(VecSet(global, value)); 379566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local)); 389566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local)); 39c4762a1bSJed Brown 409566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 41c4762a1bSJed Brown value = rank + 1; 429566063dSJacob Faibussowitsch PetscCall(VecScale(local, value)); 439566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalBegin(da, local, ADD_VALUES, global)); 449566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalEnd(da, local, ADD_VALUES, global)); 45c4762a1bSJed Brown 469566063dSJacob Faibussowitsch PetscCall(DMDACreateNaturalVector(da, &natural)); 479566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalBegin(da, global, INSERT_VALUES, natural)); 489566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalEnd(da, global, INSERT_VALUES, natural)); 49c4762a1bSJed Brown 509566063dSJacob Faibussowitsch PetscCall(DMDASetFieldName(da, 0, "First field")); 519566063dSJacob Faibussowitsch /* PetscCall(VecView(global,PETSC_VIEWER_DRAW_WORLD)); */ 52c4762a1bSJed Brown 539566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "daoutput", FILE_MODE_WRITE, &bviewer)); 549566063dSJacob Faibussowitsch PetscCall(DMView(da, bviewer)); 559566063dSJacob Faibussowitsch PetscCall(VecView(global, bviewer)); 569566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&bviewer)); 57c4762a1bSJed Brown 58c4762a1bSJed Brown /* Free memory */ 599566063dSJacob Faibussowitsch PetscCall(VecDestroy(&local)); 609566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 619566063dSJacob Faibussowitsch PetscCall(VecDestroy(&natural)); 629566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 639566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 64b122ec5aSJacob Faibussowitsch return 0; 65c4762a1bSJed Brown } 66