[GiNaC-list] How to differentiate from a Tensor?

[Vladimir V. Kisil]

>>>>> On Fri, 14 Jul 2017 14:04:56 +0430, esarcush esarcush <esarcush at gmail.com> said:

    EE> returning 0.

    You are right:  Implementation of ex::diff() for an indexed object
  always returns 0. 

  If you have a reason for a different behaviour you need to derive your
  own class for it.
-- 
Vladimir V. Kisil                 http://www.maths.leeds.ac.uk/~kisilv/
  Book:     Geometry of Mobius Transformations     http://goo.gl/EaG2Vu
  Software: Geometry of cycles          http://moebinv.sourceforge.net/