or to increase a counter while reducing it, a function like inc+ returning
{:sum sum :count count} and then take the sum/counter, which is the mean.The problem is possible to state as a clean map-reduce problem with only one traversing of the data. It's also possible to remove items form the mean operation (ie, the problem is associative). /Linus 2012/3/29 simon.T <simon.j....@gmail.com> > The obvious way is like the following, which traverse the sequence 2 times. > Wondering what will be the efficient way... > > (defn avg [coll] > (/ (reduce + coll) (count coll))) > > -- > 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 -- 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
