Conrad, What's your use case that requires for and not map? I haven't seen something like this yet, and you've got my curious.
Sean On Jan 8, 4:41 pm, Conrad <drc...@gmail.com> wrote: > Thanks again Sean/Chouser- Sounds like there isn't any easy way to do > in-step iteration using the "for" construct, as I suspected- This is > of course easily remedied for writing a convenience function for "(map > vec ...)" > > (As I mentioned in the top post, I am aware the simple example I gave > can be written more elegantly without the "for" construct.) > > On Jan 8, 2:07 pm, Sean Devlin <francoisdev...@gmail.com> wrote: > > > > > Oh, right. I saw "paralell" and the brain hit autopilot. > > > And I think you CAN improve on your fn a little bit. This should do > > the trick > > > (map + (range 1 5) (range 11 15)) > > > The mapping fn itself will be applied to as many arguments as you have > > collections. Since + is variadic, it will do the job nicely. > > > Sean > > > On Jan 8, 11:56 am, Chouser <chou...@gmail.com> wrote: > > > > On Fri, Jan 8, 2010 at 11:34 AM, Sean Devlin <francoisdev...@gmail.com> > > > wrote: > > > > Take a look at pmap > > > > I don't think that's the kind of "parallel" being asked about. > > > > > On Jan 8, 11:13 am, Conrad <drc...@gmail.com> wrote: > > > >> Looping variables in a clojure "for" loop are iterated in a serial, > > > >> cartesian fashion: > > > > >> > (for [a (range 5) b (range 10 15)] > > > > >> (+ a b)) > > > >> (10 11 12 13 14 11 12 13 14 15 12 13 14 15 16 13 14 15 16 17 14 15 16 > > > >> 17 18) > > > > >> I was wondering if there's a standard idiom for looping in parallel > > > >> fashion- Doesn't look like it's supported by the "for" macro directly. > > > >> The best code I can come up with to do this is: > > > > >> > (for [[a b] (map vector (range 5) (range 10 15))] > > > > >> (+ a b)) > > > >> (10 12 14 16 18) > > > > >> Is there a more elegant way to do this? > > > > Probably not. 'map' is the primary way to walk multiple seqs in > > > step. 'zipmap' does this too, though only for building > > > a hash-map. Of course you can always use recur as well. > > > > --Chouser > > > -- > > > -- I funded Clojure 2010, did you?
-- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
