Lets get together on the irc one time today. Lets settle this so that we can come to a consensus. Prasoon and I will be there in 1.5-2 hours. If possible, @Stefan, do come online
On Wed, Jun 12, 2013 at 7:52 PM, Stefan Krastanov < krastanov.ste...@gmail.com> wrote: > > For the mutability issue : Just as Aaron suggested, we do really need the > > objects to be mutable. Doing something as > > If I understand correctly, Aaron's main point was that mutability is > useful only in certain cases and I do not think that the current > module requires it. Most of the arguments in favor of mutability were > about how to relate two reference frames (both static translation and > orientation as well as relative velocity and angular velocity). I > think that the example I provided addresses these issue and mutability > is not necessary. > > > Then there is the problem of ScalarField + ScalarField == ScalarField. I > > think as long as we use different variables in different frames, we can > just > > drop the whole concept of a ScalarField class. > > As I have said, I am in favor of that. Moreover, using the same > variables in different frames seems like a bad idea anyway. > > > Then, we need to address the problem with Vector. What does the Vector > > inherit from? Taking a hint from the tensor module, I think we can have a > > VectorExpr class that inherits from Basic so that > > > > x == x.func(*x.args) > > > > holds. Vector shall then inherit from VectorExpr. > > Why not just follow the methodology used for scalar fields? I.e. just > creating symbols to be used as base vectors. If the issue is only > about printing then subclass Symbol. > > Concerning the garbage input, you can do verification when you call a > function on your garbage expression. > > -- > 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.
