1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Tests VecView() contour plotting for 2d DMDAs.\n\n"; 3*c4762a1bSJed Brown 4*c4762a1bSJed Brown /* 5*c4762a1bSJed Brown MATLAB must be installed to configure PETSc to have MATLAB engine. 6*c4762a1bSJed Brown Unless you have specific important reasons for using the MATLAB engine, we do not 7*c4762a1bSJed Brown recommend it. If you want to use MATLAB for visualization and maybe a little post processing 8*c4762a1bSJed Brown then you can use the socket viewer and send the data to MATLAB via that. 9*c4762a1bSJed Brown 10*c4762a1bSJed Brown VecView() on DMDA vectors first puts the Vec elements into global natural ordering before printing (or plotting) 11*c4762a1bSJed Brown them. In 2d 5 by 2 DMDA this means the numbering is 12*c4762a1bSJed Brown 13*c4762a1bSJed Brown 5 6 7 8 9 14*c4762a1bSJed Brown 0 1 2 3 4 15*c4762a1bSJed Brown 16*c4762a1bSJed Brown Now the default split across 2 processors with the DM is (by rank) 17*c4762a1bSJed Brown 18*c4762a1bSJed Brown 0 0 0 1 1 19*c4762a1bSJed Brown 0 0 0 1 1 20*c4762a1bSJed Brown 21*c4762a1bSJed Brown So the global PETSc ordering is 22*c4762a1bSJed Brown 23*c4762a1bSJed Brown 3 4 5 8 9 24*c4762a1bSJed Brown 0 1 2 6 7 25*c4762a1bSJed Brown 26*c4762a1bSJed Brown Use the options 27*c4762a1bSJed Brown -da_grid_x <nx> - number of grid points in x direction, if M < 0 28*c4762a1bSJed Brown -da_grid_y <ny> - number of grid points in y direction, if N < 0 29*c4762a1bSJed Brown -da_processors_x <MX> number of processors in x directio 30*c4762a1bSJed Brown -da_processors_y <MY> number of processors in x direction 31*c4762a1bSJed Brown */ 32*c4762a1bSJed Brown 33*c4762a1bSJed Brown #include <petscdm.h> 34*c4762a1bSJed Brown #include <petscdmda.h> 35*c4762a1bSJed Brown 36*c4762a1bSJed Brown int main(int argc,char **argv) 37*c4762a1bSJed Brown { 38*c4762a1bSJed Brown PetscMPIInt rank; 39*c4762a1bSJed Brown PetscInt M = 10,N = 8; 40*c4762a1bSJed Brown PetscErrorCode ierr; 41*c4762a1bSJed Brown PetscBool flg = PETSC_FALSE; 42*c4762a1bSJed Brown DM da; 43*c4762a1bSJed Brown PetscViewer viewer; 44*c4762a1bSJed Brown Vec local,global; 45*c4762a1bSJed Brown PetscScalar value; 46*c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE; 47*c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX; 48*c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 49*c4762a1bSJed Brown PetscViewer mviewer; 50*c4762a1bSJed Brown PetscMPIInt size; 51*c4762a1bSJed Brown #endif 52*c4762a1bSJed Brown 53*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 54*c4762a1bSJed Brown ierr = PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer);CHKERRQ(ierr); 55*c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 56*c4762a1bSJed Brown ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 57*c4762a1bSJed Brown if (size == 1) { 58*c4762a1bSJed Brown ierr = PetscViewerMatlabOpen(PETSC_COMM_WORLD,"tmp.mat",FILE_MODE_WRITE,&mviewer);CHKERRQ(ierr); 59*c4762a1bSJed Brown } 60*c4762a1bSJed Brown #endif 61*c4762a1bSJed Brown 62*c4762a1bSJed Brown ierr = PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL);CHKERRQ(ierr); 63*c4762a1bSJed Brown if (flg) stype = DMDA_STENCIL_STAR; 64*c4762a1bSJed Brown 65*c4762a1bSJed Brown /* Create distributed array and get vectors */ 66*c4762a1bSJed Brown ierr = DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da);CHKERRQ(ierr); 67*c4762a1bSJed Brown ierr = DMSetFromOptions(da);CHKERRQ(ierr); 68*c4762a1bSJed Brown ierr = DMSetUp(da);CHKERRQ(ierr); 69*c4762a1bSJed Brown ierr = DMCreateGlobalVector(da,&global);CHKERRQ(ierr); 70*c4762a1bSJed Brown ierr = DMCreateLocalVector(da,&local);CHKERRQ(ierr); 71*c4762a1bSJed Brown 72*c4762a1bSJed Brown value = -3.0; 73*c4762a1bSJed Brown ierr = VecSet(global,value);CHKERRQ(ierr); 74*c4762a1bSJed Brown ierr = DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 75*c4762a1bSJed Brown ierr = DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 76*c4762a1bSJed Brown 77*c4762a1bSJed Brown ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 78*c4762a1bSJed Brown value = rank+1; 79*c4762a1bSJed Brown ierr = VecScale(local,value);CHKERRQ(ierr); 80*c4762a1bSJed Brown ierr = DMLocalToGlobalBegin(da,local,ADD_VALUES,global);CHKERRQ(ierr); 81*c4762a1bSJed Brown ierr = DMLocalToGlobalEnd(da,local,ADD_VALUES,global);CHKERRQ(ierr); 82*c4762a1bSJed Brown 83*c4762a1bSJed Brown flg = PETSC_FALSE; 84*c4762a1bSJed Brown ierr = PetscOptionsGetBool(NULL,NULL, "-view_global", &flg,NULL);CHKERRQ(ierr); 85*c4762a1bSJed Brown if (flg) { /* view global vector in natural ordering */ 86*c4762a1bSJed Brown ierr = VecView(global,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 87*c4762a1bSJed Brown } 88*c4762a1bSJed Brown ierr = DMView(da,viewer);CHKERRQ(ierr); 89*c4762a1bSJed Brown ierr = VecView(global,viewer);CHKERRQ(ierr); 90*c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 91*c4762a1bSJed Brown if (size == 1) { 92*c4762a1bSJed Brown ierr = DMView(da,mviewer);CHKERRQ(ierr); 93*c4762a1bSJed Brown ierr = VecView(global,mviewer);CHKERRQ(ierr); 94*c4762a1bSJed Brown } 95*c4762a1bSJed Brown #endif 96*c4762a1bSJed Brown 97*c4762a1bSJed Brown /* Free memory */ 98*c4762a1bSJed Brown #if defined(PETSC_HAVE_MATLAB_ENGINE) 99*c4762a1bSJed Brown if (size == 1) { 100*c4762a1bSJed Brown ierr = PetscViewerDestroy(&mviewer);CHKERRQ(ierr); 101*c4762a1bSJed Brown } 102*c4762a1bSJed Brown #endif 103*c4762a1bSJed Brown ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr); 104*c4762a1bSJed Brown ierr = VecDestroy(&local);CHKERRQ(ierr); 105*c4762a1bSJed Brown ierr = VecDestroy(&global);CHKERRQ(ierr); 106*c4762a1bSJed Brown ierr = DMDestroy(&da);CHKERRQ(ierr); 107*c4762a1bSJed Brown ierr = PetscFinalize(); 108*c4762a1bSJed Brown return ierr; 109*c4762a1bSJed Brown } 110*c4762a1bSJed Brown 111*c4762a1bSJed Brown 112*c4762a1bSJed Brown 113*c4762a1bSJed Brown /*TEST 114*c4762a1bSJed Brown 115*c4762a1bSJed Brown test: 116*c4762a1bSJed Brown requires: x 117*c4762a1bSJed Brown nsize: 2 118*c4762a1bSJed Brown args: -nox 119*c4762a1bSJed Brown 120*c4762a1bSJed Brown TEST*/ 121