Trying to use lazy-seq for the first time, failing.
Hi, I'm trying to use lazy-seq to implement a cool piece of functionality I saw in the Factor programming language. Here is the documentation for that functionality: http://docs.factorcode.org/content/word-produce,sequences.html I think a lazy version of Factor's "produce" word would be super- powerful for some of the things I'm working on. This is the first time I've tried to create my own lazy sequence, so don't laugh. Here is my attempt: http://gist.github.com/136825 For some reason, the lazy sequence that is returned is always empty (?) or at least seems that way. Am I doing something silly? Or perhaps I've misunderstood lazy-seq's operation. Thanks in advance for any advice, -Harold --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Trying to use lazy-seq for the first time, failing.
On Jun 27, 9:48 am, Meikel Brandmeyer wrote: > Hi, > > Am 27.06.2009 um 02:23 schrieb _hrrld: > > > Am I doing something silly? Or perhaps I've misunderstood lazy-seq's > > operation. > > I think, it's the latter. Here my try on an explanation: > (snip...) I found your explanation cogent and helpful, thank you. > And finally you can get something similar with Clojure sequence > library. I think it's slightly different to your code, but maybe > it also works for you. > > (defn slightly-different-produce > [pred generator value] > (take-while pred (iterate generator value))) take-while iterate... This is great also. Much appreciated, -Harold --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Trying to use lazy-seq for the first time, failing.
On Jun 29, 1:15 am, Emeka wrote: > Harold, > > Do you have any material on Factor? I won't going through it. Emeka, Many of these links are relevant: http://www.google.com/search?q=factor+language Regards, -Harold --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Newbish question. Does anyone have any example code for playing a wav sound file?
On Jul 27, 7:00 pm, Rayne wrote: > All I'm trying to do is play a simple .wav sound file once. > > I'll appreciate any examples! I'm hesitant to even share this, since I consider myself a rank Clojure and Java neophyte, but I think it is what you're asking for: http://github.com/harold/clj-sound/tree/master Specifically, have a look at sound-test.clj in that project. It plays the wav file (on my machine at least), but I'd be very surprised if it were anything like the way someone who knew what they were doing would do it. In any event, -Harold --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Processing elements in a lazy seq in parallel
On Aug 10, 12:18 pm, Tom Emerson wrote: > Hello Clojurians, > > file-seq gives me a convenient way to get a seq of all these files. > What I would like to do is process elements in this sequence in > parallel. My first thought was to process the seq with pmap, but this > is suboptimal because I'm not interested in saving the return value of > function called on each file. > Hi Tom, I built something that does something similar to what you're describing. There's likely a better way to do what I've done, but you still may be interested to see it: http://github.com/harold/p4check/tree/master It uses agents to achieve parallelism, and runs quite fast and soaks the cpus in my multi-core machine nicely. It's much faster than the previous single-threaded version was. Hope that helps, -Harold --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
