Actual source code: ex210.c

  1: static char help[] = "Test MatCreateNest with block sizes.\n";

  3: #include <petscmat.h>

  5: int main(int argc, char **argv)
  6: {
  7:   Mat                    A, B, C, mats[2];
  8:   ISLocalToGlobalMapping cmap, rmap;
  9:   const PetscInt         indices[1] = {0};
 10:   PetscMPIInt            size;

 12:   PetscInitialize(&argc, &argv, NULL, help);
 13:   MPI_Comm_size(PETSC_COMM_WORLD, &size);
 15:   MatCreate(PETSC_COMM_WORLD, &A);
 16:   MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, 1, 2);
 17:   MatSetBlockSizes(A, 1, 2);
 18:   MatSetType(A,MATAIJ);
 19:   ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 2, 1, indices,PETSC_COPY_VALUES, &cmap);
 20:   ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 1, 1, indices,PETSC_COPY_VALUES, &rmap);
 21:   MatSetLocalToGlobalMapping(A, rmap, cmap);
 22:   MatCreate(PETSC_COMM_WORLD, &B);
 23:   MatSetSizes(B, PETSC_DECIDE, PETSC_DECIDE, 1, 1);
 24:   MatSetBlockSizes(A, 1, 1);
 25:   MatSetType(B,MATAIJ);
 26:   MatSetLocalToGlobalMapping(B, rmap, rmap);
 27:   ISLocalToGlobalMappingDestroy(&rmap);
 28:   ISLocalToGlobalMappingDestroy(&cmap);
 29:   MatSetUp(A);
 30:   MatSetUp(B);
 31:   mats[0] = A;
 32:   mats[1] = B;
 33:   MatCreateNest(PETSC_COMM_WORLD, 1, NULL, 2, NULL, mats,&C);
 34:   MatSetUp(C);
 35:   MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY);
 36:   MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY);
 37:   MatView(C, NULL);
 38:   MatDestroy(&C);
 39:   MatDestroy(&B);
 40:   MatDestroy(&A);
 41:   PetscFinalize();
 42:   return 0;
 43: }

 45: /*TEST

 47:     test:

 49: TEST*/