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 PetscErrorCode ierr; 41c4762a1bSJed Brown PetscBool flg = PETSC_FALSE; 42c4762a1bSJed Brown DM da; 43c4762a1bSJed Brown PetscViewer viewer; 44c4762a1bSJed Brown Vec local,global; 45c4762a1bSJed Brown PetscScalar value; 46c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE; 47c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX; 48c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 49c4762a1bSJed Brown PetscViewer mviewer; 50c4762a1bSJed Brown PetscMPIInt size; 51c4762a1bSJed Brown #endif 52c4762a1bSJed Brown 53c4762a1bSJed Brown ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 54*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer)); 55c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 56*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 57c4762a1bSJed Brown if (size == 1) { 58*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerMatlabOpen(PETSC_COMM_WORLD,"tmp.mat",FILE_MODE_WRITE,&mviewer)); 59c4762a1bSJed Brown } 60c4762a1bSJed Brown #endif 61c4762a1bSJed Brown 62*5f80ce2aSJacob Faibussowitsch CHKERRQ(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 */ 66*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da)); 67*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMSetFromOptions(da)); 68*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMSetUp(da)); 69*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMCreateGlobalVector(da,&global)); 70*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMCreateLocalVector(da,&local)); 71c4762a1bSJed Brown 72c4762a1bSJed Brown value = -3.0; 73*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSet(global,value)); 74*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 75*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 76c4762a1bSJed Brown 77*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 78c4762a1bSJed Brown value = rank+1; 79*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecScale(local,value)); 80*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMLocalToGlobalBegin(da,local,ADD_VALUES,global)); 81*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMLocalToGlobalEnd(da,local,ADD_VALUES,global)); 82c4762a1bSJed Brown 83c4762a1bSJed Brown flg = PETSC_FALSE; 84*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetBool(NULL,NULL, "-view_global", &flg,NULL)); 85c4762a1bSJed Brown if (flg) { /* view global vector in natural ordering */ 86*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(global,PETSC_VIEWER_STDOUT_WORLD)); 87c4762a1bSJed Brown } 88*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMView(da,viewer)); 89*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(global,viewer)); 90c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 91c4762a1bSJed Brown if (size == 1) { 92*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMView(da,mviewer)); 93*5f80ce2aSJacob Faibussowitsch CHKERRQ(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) { 100*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerDestroy(&mviewer)); 101c4762a1bSJed Brown } 102c4762a1bSJed Brown #endif 103*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscViewerDestroy(&viewer)); 104*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&local)); 105*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&global)); 106*5f80ce2aSJacob Faibussowitsch CHKERRQ(DMDestroy(&da)); 107c4762a1bSJed Brown ierr = PetscFinalize(); 108c4762a1bSJed Brown return ierr; 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