A few days ago I opened an issue requesting information about vector expressions [1]. Thanks to covid lock-down I had enough free-time to develop something. In the issue it was suggested that I could open a pull-request, but before doing that I would like to solve a problem I'm having a hard time comprehending. This is the link to the repo I'm working on [2].
The problem is with the class *VecAdd*; ideally, I would like it to subclass the class *Add*, so that it would "simplify" the arguments. However, if I do that, the evaluation of n-derivatives would return instances of the class *Add*! I checked the output of *_eval_derivative_n_times* which is of type *VecAdd*, however it must be intercepted by some other function and finally it returns an instance of the class *Add*. I absolutely need it to return an instance of *VecAdd*. Can someone help me understand what the problem is and suggest corrective actions? Thanks! [1] https://github.com/sympy/sympy/issues/18987 [2] https://github.com/Davide-sd/sympy_vector_expressions -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/1ab183ad-bfc6-474c-8b53-acb44946008d%40googlegroups.com.
