Actual source code: ex22.c
petsc-3.12.4 2020-02-04
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      2: static char help[] = "Tests MatSetValuesBlockedStencil() in 3d.\n\n";

      4:  #include <petscmat.h>
      5:  #include <petscdm.h>
      6:  #include <petscdmda.h>

      8: int main(int argc,char **argv)
      9: {
     10:   PetscInt        M = 3,N = 4,P = 2,s = 1,w = 2,i, m = PETSC_DECIDE,n = PETSC_DECIDE,p = PETSC_DECIDE;
     11:   PetscErrorCode  ierr;
     12:   DM              da;
     13:   Mat             mat;
     14:   DMDAStencilType stencil_type = DMDA_STENCIL_BOX;
     15:   PetscBool       flg          = PETSC_FALSE;
     16:   MatStencil      idx[2],idy[2];
     17:   PetscScalar     *values;

     19:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
     20:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
     21:   PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);
     22:   PetscOptionsGetInt(NULL,NULL,"-P",&P,NULL);
     23:   PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
     24:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
     25:   PetscOptionsGetInt(NULL,NULL,"-p",&p,NULL);
     26:   PetscOptionsGetInt(NULL,NULL,"-s",&s,NULL);
     27:   PetscOptionsGetInt(NULL,NULL,"-w",&w,NULL);
     28:   PetscOptionsGetBool(NULL,NULL,"-star",&flg,NULL);
     29:   if (flg) stencil_type =  DMDA_STENCIL_STAR;

     31:   /* Create distributed array and get vectors */
     32:   DMDACreate3d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,stencil_type,M,N,P,m,n,p,w,s,0,0,0,&da);
     33:   DMSetFromOptions(da);
     34:   DMSetUp(da);
     35:   DMSetMatType(da,MATMPIBAIJ);
     36:   DMCreateMatrix(da,&mat);

     38:   idx[0].i = 1;   idx[0].j = 1; idx[0].k = 0;
     39:   idx[1].i = 2;   idx[1].j = 1; idx[1].k = 0;
     40:   idy[0].i = 1;   idy[0].j = 2; idy[0].k = 0;
     41:   idy[1].i = 2;   idy[1].j = 2; idy[1].k = 0;
     42:   PetscMalloc1(2*2*w*w,&values);
     43:   for (i=0; i<2*2*w*w; i++) values[i] = i;
     44:   MatSetValuesBlockedStencil(mat,2,idx,2,idy,values,INSERT_VALUES);
     45:   MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);
     46:   MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);

     48:   /* Free memory */
     49:   PetscFree(values);
     50:   MatDestroy(&mat);
     51:   DMDestroy(&da);
     52:   PetscFinalize();
     53:   return ierr;
     54: }