1 static char help[] = "Tests MAIJ matrix for large DOF\n\n"; 2 3 #include <petscdm.h> 4 #include <petscdmda.h> 5 6 int main(int argc,char *argv[]) 7 { 8 Mat M; 9 Vec x,y; 10 DM da,daf; 11 12 PetscFunctionBeginUser; 13 PetscCall(PetscInitialize(&argc,&argv,0,help)); 14 PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_STAR,4,5,PETSC_DECIDE,PETSC_DECIDE,41,1,0,0,&da)); 15 PetscCall(DMSetFromOptions(da)); 16 PetscCall(DMSetUp(da)); 17 PetscCall(DMRefine(da,PETSC_COMM_WORLD,&daf)); 18 PetscCall(DMCreateInterpolation(da,daf,&M,NULL)); 19 PetscCall(DMCreateGlobalVector(da,&x)); 20 PetscCall(DMCreateGlobalVector(daf,&y)); 21 22 PetscCall(MatMult(M,x,y)); 23 PetscCall(MatMultTranspose(M,y,x)); 24 PetscCall(DMDestroy(&da)); 25 PetscCall(DMDestroy(&daf)); 26 PetscCall(VecDestroy(&x)); 27 PetscCall(VecDestroy(&y)); 28 PetscCall(MatDestroy(&M)); 29 PetscCall(PetscFinalize()); 30 return 0; 31 } 32 33 /*TEST 34 35 test: 36 nsize: 2 37 38 TEST*/ 39