On Friday, September 9, 2016 at 11:56:58 AM UTC-4, Christoph Ortner wrote: > > I predict that - right now - somebody is writing an answer explaining why > this is terrible and you need an abstract array type with lazy evaluation. > ;)
Well, we already have the built-in constant I. I[i,j] is the j-th element of the i-th unit vector, computed lazily, i.e. the Kronecker delta function. But yes, if you need unit vectors a lot you may be doing something wrong.
