@Prasoon, Vector + Vector is fine. What about vector * vector or scalar + vector or any other such nonsense operation? If you are going to subclass from Basic, this can be done with handling of the operators as I have already pointed out. But how we will do this without operator overloading in case of Expr subclassing is unclear to me. +1 for subclassing from Basic. May involve redefining certain functions, but I think thats essential.
In any case, I agree about coming to a consensus soon to avoid delay. On Tue, Jun 11, 2013 at 4:56 PM, Prasoon Shukla <prasoon92.i...@gmail.com>wrote: > Let us get some things clear here. Vector is going to be subclassed from > Basic. Also, after seeing the discussions/problems above, Vector + Vector > will give an Add on which we can call something akin to a .doit() to result > in a Vector. I do not see any problems with this approach. > > Next, reference frames. First thing is the distinction between RefFrame > class and CoordSys class. Stefan has pointed out that there is no need to > implement the classes differently. Okay, then we will have just one, * > immutable,* CoordSys class. The parameters required for intialization of > kinematic parameters will have to be provided when declaring the coordinate > system. New CoordSys object will result from methods like rotate, orient > etc. > > With these suggestions, I do not think that there should be any more > structural issues. If there are any more of these issues, please mention > them here now and please mention them as early as possible. > > These changes are justified, I hope, because this module has to play nice > with the rest of SymPy. > > I just feel that we are getting stuck with and spending too much time on > things that we shouldn't be taking this much time. Therefore, I request > again to all parties involved : Please voice your views/problems with these > structural changes suggested so that we can move ahead with things. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "sympy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sympy/t-Je0beTIIU/unsubscribe?hl=en-US. > To unsubscribe from this group and all its topics, send an email to > sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy?hl=en-US. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- 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 post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
