Hello,

I have a very important question that I can't seem to find anywhere in the literature.  I am trying to create a procedure to do something that would be seeminly impossible by hand.  In doing so, I need to create exactly 729 variables, which I would like to simply call x_i for i=1...729.  Yet the problem is that I don't know how to define the variable x_i during the procedure.  For example, I would like to do something of the sort: