Hello,
i have a question regarding symbolic differentiation with GiNAC.
Here is what i am trying to do:
I have to variables a(t) and b(t), both are dependent from time (t).
Suppose, this two variables are multiplied liked this:
a(t) * b(t)
Is it possible to derive this expression (a(t)*b(t)) according time with
ginac.
The only function i found in the manual is usefull for partial derivation,
which does not help me here.
Here is some example code:
symbol a("a"), b("b"); // <-- how to tell ginac that variable a and b is
dependant from variable t
expression f = a*b;
std::cout << f.diff(t,1) << std::endl;
Many thanks in advance and best regards
Martin Ettl