[GiNaC-list] GiNaC::marix::solve(..) problem

Hey, I have a smallish problem with the method mentioned above (matrix::solve(..)). I have two nxn numeric matrices A and b (from the equation Ax=b) and of course want the matrix x in the end but I keep on getting the error that the first argument must be a matrix of symbols. Now my question how can I do that? I tried it with ex symbolic_matrix(..) but I couldn't get it to work since it is of the type ex and not matrix. Kind regards, Lisa