On 4/14/08, Viktor Nagy <viktor.nagy at gmail.com> wrote: > "p(K) defined" > p(K) := M(K)[1,1]*p2+M(K)[1,2]*p1+M(K)[1,3]$ There is a syntax error here -- there needs to be a ; or $ after "p(K) defined". So, I guess, p(K) is not actually defined. Maybe that's a problem. HTH Robert Dodier