13   Mat          A, A11, A12, A21, A22;  in main()  local
61   PetscCall(MatCreate(PETSC_COMM_SELF, &A11));  in main()
62   PetscCall(MatSetSizes(A11, size1, size1, size1, size1));  in main()
63   PetscCall(MatSetType(A11, MATSEQDENSE));  in main()
64   PetscCall(MatSeqDenseSetPreallocation(A11, b));  in main()
65   PetscCall(MatDenseSetLDA(A11, size));  in main()
66   PetscCall(MatAssemblyBegin(A11, MAT_FINAL_ASSEMBLY));  in main()
67   PetscCall(MatAssemblyEnd(A11, MAT_FINAL_ASSEMBLY));  in main()
103   PetscCall(MatMult(A11, X1, Z1));  in main()
133   PetscCall(MatMult(A11, X1, Z1));  in main()
145   PetscCall(MatMultTranspose(A11, X1, Z1));  in main()
158   PetscCall(MatDestroy(&A11));  in main()