On Fri, Apr 6, 2012 at 10:49 AM, Ray Racine <[email protected]> wrote: > Morning, > > I'm putting together an equivalent of a dataframe from R in Racket. > > To maximize performance of computation over vectors of real numbers is > FlVector the correct type to use in Typed Racket?
Yes, flvectors in general will be more memory effcient and enable more optimizations in Racket and Typed Racket. > Is there some sort of performance gain by having flvector-length in addition > to vector-length? No, that's just how flvectors work -- they have a different function for getting the length. > Is the following behavior a bug? > >> (vector-length (flvector 1.2 2.3)) > stdin::43119: Type Checker: Expected Vector, but got FlVector in: (flvector > 1.2 No, that operation is a (dynamic) error in Racket as well: -> (vector-length (flvector)) ; vector-length: expects argument of type <vector>; given: #<flvector> -- sam th [email protected] ____________________ Racket Users list: http://lists.racket-lang.org/users
