1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests VecView() contour plotting for 2d DMDAs.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown /* 5c4762a1bSJed Brown MATLAB must be installed to configure PETSc to have MATLAB engine. 6c4762a1bSJed Brown Unless you have specific important reasons for using the MATLAB engine, we do not 7c4762a1bSJed Brown recommend it. If you want to use MATLAB for visualization and maybe a little post processing 8c4762a1bSJed Brown then you can use the socket viewer and send the data to MATLAB via that. 9c4762a1bSJed Brown 10c4762a1bSJed Brown VecView() on DMDA vectors first puts the Vec elements into global natural ordering before printing (or plotting) 11c4762a1bSJed Brown them. In 2d 5 by 2 DMDA this means the numbering is 12c4762a1bSJed Brown 13c4762a1bSJed Brown 5 6 7 8 9 14c4762a1bSJed Brown 0 1 2 3 4 15c4762a1bSJed Brown 16c4762a1bSJed Brown Now the default split across 2 processors with the DM is (by rank) 17c4762a1bSJed Brown 18c4762a1bSJed Brown 0 0 0 1 1 19c4762a1bSJed Brown 0 0 0 1 1 20c4762a1bSJed Brown 21c4762a1bSJed Brown So the global PETSc ordering is 22c4762a1bSJed Brown 23c4762a1bSJed Brown 3 4 5 8 9 24c4762a1bSJed Brown 0 1 2 6 7 25c4762a1bSJed Brown 26c4762a1bSJed Brown Use the options 27c4762a1bSJed Brown -da_grid_x <nx> - number of grid points in x direction, if M < 0 28c4762a1bSJed Brown -da_grid_y <ny> - number of grid points in y direction, if N < 0 29c4762a1bSJed Brown -da_processors_x <MX> number of processors in x directio 30c4762a1bSJed Brown -da_processors_y <MY> number of processors in x direction 31c4762a1bSJed Brown */ 32c4762a1bSJed Brown 33c4762a1bSJed Brown #include <petscdm.h> 34c4762a1bSJed Brown #include <petscdmda.h> 35c4762a1bSJed Brown 36*d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv) 37*d71ae5a4SJacob Faibussowitsch { 38c4762a1bSJed Brown PetscMPIInt rank; 39c4762a1bSJed Brown PetscInt M = 10, N = 8; 40c4762a1bSJed Brown PetscBool flg = PETSC_FALSE; 41c4762a1bSJed Brown DM da; 42c4762a1bSJed Brown PetscViewer viewer; 43c4762a1bSJed Brown Vec local, global; 44c4762a1bSJed Brown PetscScalar value; 45c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE; 46c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX; 47d1e78c4fSBarry Smith #if defined(PETSC_HAVE_MATLAB) 48c4762a1bSJed Brown PetscViewer mviewer; 49c4762a1bSJed Brown PetscMPIInt size; 50c4762a1bSJed Brown #endif 51c4762a1bSJed Brown 52327415f7SBarry Smith PetscFunctionBeginUser; 539566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 549566063dSJacob Faibussowitsch PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD, 0, "", 300, 0, 300, 300, &viewer)); 55d1e78c4fSBarry Smith #if defined(PETSC_HAVE_MATLAB) 569566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 5748a46eb9SPierre Jolivet if (size == 1) PetscCall(PetscViewerMatlabOpen(PETSC_COMM_WORLD, "tmp.mat", FILE_MODE_WRITE, &mviewer)); 58c4762a1bSJed Brown #endif 59c4762a1bSJed Brown 609566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL, NULL, "-star_stencil", &flg, NULL)); 61c4762a1bSJed Brown if (flg) stype = DMDA_STENCIL_STAR; 62c4762a1bSJed Brown 63c4762a1bSJed Brown /* Create distributed array and get vectors */ 649566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, &da)); 659566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 669566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 679566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da, &global)); 689566063dSJacob Faibussowitsch PetscCall(DMCreateLocalVector(da, &local)); 69c4762a1bSJed Brown 70c4762a1bSJed Brown value = -3.0; 719566063dSJacob Faibussowitsch PetscCall(VecSet(global, value)); 729566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local)); 739566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local)); 74c4762a1bSJed Brown 759566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 76c4762a1bSJed Brown value = rank + 1; 779566063dSJacob Faibussowitsch PetscCall(VecScale(local, value)); 789566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalBegin(da, local, ADD_VALUES, global)); 799566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalEnd(da, local, ADD_VALUES, global)); 80c4762a1bSJed Brown 81c4762a1bSJed Brown flg = PETSC_FALSE; 829566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL, NULL, "-view_global", &flg, NULL)); 83c4762a1bSJed Brown if (flg) { /* view global vector in natural ordering */ 849566063dSJacob Faibussowitsch PetscCall(VecView(global, PETSC_VIEWER_STDOUT_WORLD)); 85c4762a1bSJed Brown } 869566063dSJacob Faibussowitsch PetscCall(DMView(da, viewer)); 879566063dSJacob Faibussowitsch PetscCall(VecView(global, viewer)); 88d1e78c4fSBarry Smith #if defined(PETSC_HAVE_MATLAB) 89c4762a1bSJed Brown if (size == 1) { 909566063dSJacob Faibussowitsch PetscCall(DMView(da, mviewer)); 919566063dSJacob Faibussowitsch PetscCall(VecView(global, mviewer)); 92c4762a1bSJed Brown } 93c4762a1bSJed Brown #endif 94c4762a1bSJed Brown 95c4762a1bSJed Brown /* Free memory */ 96d1e78c4fSBarry Smith #if defined(PETSC_HAVE_MATLAB) 9748a46eb9SPierre Jolivet if (size == 1) PetscCall(PetscViewerDestroy(&mviewer)); 98c4762a1bSJed Brown #endif 999566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 1009566063dSJacob Faibussowitsch PetscCall(VecDestroy(&local)); 1019566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 1029566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 1039566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 104b122ec5aSJacob Faibussowitsch return 0; 105c4762a1bSJed Brown } 106c4762a1bSJed Brown 107c4762a1bSJed Brown /*TEST 108c4762a1bSJed Brown 109c4762a1bSJed Brown test: 110c4762a1bSJed Brown requires: x 111c4762a1bSJed Brown nsize: 2 112c4762a1bSJed Brown args: -nox 113c4762a1bSJed Brown 114c4762a1bSJed Brown TEST*/ 115