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 36c4762a1bSJed Brown int main(int argc,char **argv) 37c4762a1bSJed Brown { 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; 47c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 48c4762a1bSJed Brown PetscViewer mviewer; 49c4762a1bSJed Brown PetscMPIInt size; 50c4762a1bSJed Brown #endif 51c4762a1bSJed Brown 52*327415f7SBarry Smith PetscFunctionBeginUser; 539566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 549566063dSJacob Faibussowitsch PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer)); 55c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 569566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 57c4762a1bSJed Brown if (size == 1) { 589566063dSJacob Faibussowitsch PetscCall(PetscViewerMatlabOpen(PETSC_COMM_WORLD,"tmp.mat",FILE_MODE_WRITE,&mviewer)); 59c4762a1bSJed Brown } 60c4762a1bSJed Brown #endif 61c4762a1bSJed Brown 629566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL)); 63c4762a1bSJed Brown if (flg) stype = DMDA_STENCIL_STAR; 64c4762a1bSJed Brown 65c4762a1bSJed Brown /* Create distributed array and get vectors */ 669566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da)); 679566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 689566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 699566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da,&global)); 709566063dSJacob Faibussowitsch PetscCall(DMCreateLocalVector(da,&local)); 71c4762a1bSJed Brown 72c4762a1bSJed Brown value = -3.0; 739566063dSJacob Faibussowitsch PetscCall(VecSet(global,value)); 749566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 759566063dSJacob Faibussowitsch PetscCall(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 76c4762a1bSJed Brown 779566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 78c4762a1bSJed Brown value = rank+1; 799566063dSJacob Faibussowitsch PetscCall(VecScale(local,value)); 809566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalBegin(da,local,ADD_VALUES,global)); 819566063dSJacob Faibussowitsch PetscCall(DMLocalToGlobalEnd(da,local,ADD_VALUES,global)); 82c4762a1bSJed Brown 83c4762a1bSJed Brown flg = PETSC_FALSE; 849566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL,NULL, "-view_global", &flg,NULL)); 85c4762a1bSJed Brown if (flg) { /* view global vector in natural ordering */ 869566063dSJacob Faibussowitsch PetscCall(VecView(global,PETSC_VIEWER_STDOUT_WORLD)); 87c4762a1bSJed Brown } 889566063dSJacob Faibussowitsch PetscCall(DMView(da,viewer)); 899566063dSJacob Faibussowitsch PetscCall(VecView(global,viewer)); 90c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 91c4762a1bSJed Brown if (size == 1) { 929566063dSJacob Faibussowitsch PetscCall(DMView(da,mviewer)); 939566063dSJacob Faibussowitsch PetscCall(VecView(global,mviewer)); 94c4762a1bSJed Brown } 95c4762a1bSJed Brown #endif 96c4762a1bSJed Brown 97c4762a1bSJed Brown /* Free memory */ 98c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 99c4762a1bSJed Brown if (size == 1) { 1009566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&mviewer)); 101c4762a1bSJed Brown } 102c4762a1bSJed Brown #endif 1039566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 1049566063dSJacob Faibussowitsch PetscCall(VecDestroy(&local)); 1059566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 1069566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 1079566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 108b122ec5aSJacob Faibussowitsch return 0; 109c4762a1bSJed Brown } 110c4762a1bSJed Brown 111c4762a1bSJed Brown /*TEST 112c4762a1bSJed Brown 113c4762a1bSJed Brown test: 114c4762a1bSJed Brown requires: x 115c4762a1bSJed Brown nsize: 2 116c4762a1bSJed Brown args: -nox 117c4762a1bSJed Brown 118c4762a1bSJed Brown TEST*/ 119