Bart - that hadn't occured to me. If you'll bear with the analogy - it feels like asking a very very dense valet for your car. Once you have provided every tedious detail of the description of the car, including which parking lot its in - if you're persistent you will get your car back.
I guess in reality the valets (struct::matrix) are lazy and will look in the current parking lot where you are standing unless you kick them in the double colon and make them work a little harder.
