About the printing of PetscMat


I am testing "test_transpose() " of PETSC2.jl.

    A = make_mat()
    # test CreateMatTransposed
    At = PETSc2.MatCreateTranspose(A)

I can "println(A)", but I can not "println(At)". If I want to view At, should I use PetscView or something else? 
Thanks,