Try using numbered_symbols().
Aaron Meurer
On Thu, May 2, 2013 at 10:49 AM, Prasoon Shukla <prasoon92.i...@gmail.com>wrote:
> I had a 2 day break between exams so I began work on the CoordSystem
> class. Hopefully, I'll be able to make a WIP PR before 15th.
>
> One problem I am facing is this: In this class, there is a *lot* of
> initialization going on. A part of that is generating non-commutative
> symbols to represent the basis elements. Since we planning to support n
> dimensional coordinate system for rectangular coordinates, I would need n
> basis elements.
> So, I basically need to do initialization n times like so:
> self.e1 = Symbol('e1') ... upto n times.
>
> Obviously this is not feasible since we don't know n.
> I can get a tuple of symbols using the symbols('e1: '+ str(n+1)) but then
> again is the problem of initializing the object properties.
>
> The only way I can think of doing this is to use the exec statement.
>
> sym_tuple = symbols('e1:' + str(n+1))
> for i in range(1, n+1):
> cmd = 'self.e' + str(i) + ' = sym_tuple[ ' + str(i-1) + ']'
> exec cmd
>
> But then again, I know that using exec is frowned upon in general. So, is
> there a better way to go about this?
>
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