Some question to understand MuPad

Hi,

I've in base workspace a symbolic matrix:

R03 =

[ cos(t2 + t3)*cos(t1), -sin(t2 + t3)*cos(t1),  sin(t1)]
[ cos(t2 + t3)*sin(t1), -sin(t2 + t3)*sin(t1), -cos(t1)]
[         sin(t2 + t3),          cos(t2 + t3),        0]

I want write it in MuPad, so, following this guide http://www.mathworks.it/it/help/symbolic/copy-variables-and-expressions-between-matlab-and-mupad.html

I create a test-MPNotebook-file, I create a notebook handle as:

nb = mupad(file_name);

and I write:

setVar(nb,R03)

but it doesn't appear. When I write in the notebook:

anames(All, User)

it is in the notebook but as:

{R03}

What is the correct way to print the matrix R03 (with its symbolic expressions) in the MuPad ?