>
> Does 'diff(v,v[r]) solve your problem? What is the larger problem you
> are trying to solve?
>
Actually, I have a set of equations for unknown functions like f(v,u),
where v=(v[1],v[2],...,v[m])
is a vector of complex or real variables and u in {1,2,...,n}. I have to
take first and second order partial derivatives for the equations with
respect of v[r] and v[s] for different r and s. In fact, the problem is
solvable with paper and pencil, but it must be a huge piece of paper and
there's still a possibility of mistakes while rewriting expressions... I
wanted to automate the derivation. Alas!
--
Andrei Zorine