Ranjit, try the following to see it in action even at the REPL: (def xt (make-array Float/TYPE 3 3))
(def myloop (for [x (range 3) y (range 3)] (aset xt x y 1))) (aget xt 1 1) ;; xt hasn't been changed myloop ;; force REPL to de-lazify (aget xt 1 1) ;; changed now On Sep 13, 9:28 am, Mark Nutter <manutte...@gmail.com> wrote: > Erg, gmail hiccup. Started to say if you try to use it in code that's > *not* being called from the REPL, you'll be scratching your head > trying to figure out why aset never gets called. > > Mark > > On Mon, Sep 13, 2010 at 12:27 PM, Mark Nutter <manutte...@gmail.com> wrote: > > The REPL automatically realizes the lazy sequence in the process of > > printing it out, but if you try to us > > > On Mon, Sep 13, 2010 at 11:07 AM, Ranjit <rjcha...@gmail.com> wrote: > >> Thanks Armando for catching my stupid mistake. That fixed everything. > > >> Meikel, I'm not sure I understand what you're saying. When I evaluate > >> this in the REPL > > >> (for [x (range 2) y (range 2)] (aset xt x y (+ x y))) > >> (aget xt 0 0) > >> (aget xt 1 1) > > >> I get back 0 and 2 as I expect. Isn't the call to aset consuming the > >> lazy sequence? > > >> Thanks. > > >> On Sep 13, 11:00 am, Meikel Brandmeyer <m...@kotka.de> wrote: > >>> Hi, > > >>> On 13 Sep., 15:07, Ranjit Chacko <rjcha...@gmail.com> wrote: > > >>> > (for [x (range 3) y (range 3)] (aset xt x y 1)) > > >>> Note that that this will not do what you think it does. for creates a > >>> lazy sequence which is thrown away immediately. So the aset calls are > >>> never done. for is a list comprehension, not a looping construct. > >>> Replace for with doseq. As a rule of thumb: side-effects => command > >>> starting in "do". > > >>> Sincerely > >>> Meikel > > >> -- > >> 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
