[R] "deriv" and chain rule and matrix derivatives

[Ahmad_Abu_Hammour/STUDENTS/FIRE%FIRE@fordham.edu]

   Hi,
   Anybody knows if I c   MATRIX
   derivation.
   Simple examples:
   y=expression(log(x))
   z=express   deriv(z,"x") # chain rule
   f=expression(det(x)) # where x is an (nxn) matrix
   deriv(f, "x")
   Is ther   Thank you ver   Ahmad Abu Hammour
   PS. by the way I tried to send the same email using my http-ba   account hammour at msn.com, but I could not, although I set send email to