And array-get seems to be aget by now. a.
Jarkko Oranen schrieb: > On Mar 20, 1:52 pm, Glen Rubin <rubing...@gmail.com> wrote: > > Hey all, > > > > I am working through the problems on project euler. On question > > number 11 (http://projecteuler.net/index.php?section=problems&id=11), > > I was unable to come up with a solution, so I cheated and looked at > > some other people's answer's here: > > http://clojure-euler.wikispaces.com/Problem+011 > > > > Unfortunately, I am so dumb I cannot even understand the solutions > > very well...hahhaha. The first solution on that page defines the > > following function: > > > > (defn select-dir [array x y ncol span fnx fny] > > (when (not (zero? span)) > > (lazy-cons > > (array-get array x y ncol) > > (select-dir array (fnx x) (fny y) ncol (dec span) fnx fny)))) > > > > Right off the bat, I am wondering what is lazy-cons? I could not find > > it in the api. > > That's because it has been removed. It became obsoleted by seq > behaviour changes sometime before 1.0 was released. > > a more up-to-date version of that would be: > > (defn select-dir [array x y ncol span fnx fny] > (when-not (zero? span) > (lazy-seq > (cons (array-get array x y ncol) > (select-dir array (fnx x) (fny y) ncol (dec span) fnx > fny))))) > > Another approach that is common when constructing lazy seqs, > forming a closure over the constant parameters: > > (defn s-dir [array x y ncol span fnx fny] > (letfn [(worker [x y span] > (when-not (zero? span) > (lazy-seq > (cons (array-get array x y ncol) > (worker (fnx x) (fny y) (dec span))))))] > (worker x y span))) -- 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 To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
