**TI92P*advrm1RjacobianM¥Zóéäèjacðuè6äèååvarsðåððÕgradÚÓujacð­jacð€èåððtäèååvarsðåðÕgradÚÓujacð€èvarsðlð€èåvecjac}äèæèand vars are lists.æèof vector field f, f æèReturns Jacobian matrixæèæèäåvarsÜ_