Re: Clojure Kata

Hi Patrick, On Sun, Jan 24, 2010 at 9:58 PM, CuppoJava wrote: > It's an elegant puzzle. Thanks Sean! > > Here's my take: > (defn sift [pred? s] >  (lazy-seq >    (if (seq s) >      (let [key (first s) >            [vals remaining] (split-with #(not (pred? %)) (rest s))] >        (cons [key vals]

Re: Clojure Kata

Here a different version, without the sequence abstraction. I realise its idiomatically obsolete, but thought you guys might enjoy it. (defn sift "Sift. Old Skool." [key-pred in-s] (reduce (fn [coll elem] (if (key-pred elem) (conj coll [(str elem) []]) (conj (po

Re: Jython interop

On 25 tammi, 00:26, rob wrote: > Hi, > > I was wondering if anyone has tried somehow calling Jython functions > from within Clojure, and how you went about doing this if so.  I have > not used Jython, but I would imagine the Jython interpreter can be > invoked in the same way as any other java cod

Re: Full Disclojure - I Need Topics!

I would be interested in native / C interoperability; perhaps either (or both) of these libraries: http://github.com/bagucode/clj-native http://github.com/Chouser/clojure-jna And others, if there are similar ones. In general, "the Clojure way of interacting with native code". Best Regards, Joona

Help needed regarding the use of macro

Hi, I am new to clojure. I want to use try-catch block to the (.getPage *wc* ~url) statement of code. But I am getting this error: java.lang.Exception: Can't bind qualified name:nlplabs.webfetch.agent/ exception Would u pls help me to sort out this problem? Thanx in advance Code snippet: (ns nl

Re: Help needed regarding the use of macro

2010/1/25 Manish : > Hi, > I am new to clojure. I want to use try-catch block to the  (.getPage > *wc* ~url) statement of code. But I am getting this error: > java.lang.Exception: Can't bind qualified name:nlplabs.webfetch.agent/ > exception > > Would u pls help me to sort out this problem? > > Tha

Re: Help needed regarding the use of macro

Nothing is declared in this namespace as "exception" On Jan 25, 5:03 pm, Michael Wood wrote: > 2010/1/25 Manish : > > > > > Hi, > > I am new to clojure. I want to use try-catch block to the  (.getPage > > *wc* ~url) statement of code. But I am getting this error: > > java.lang.Exception: Can't bi

Re: Help needed regarding the use of macro

Thanx for ur quick response, And its not making difference by changing "exception" to "e". I am still getting this error: java.lang.Exception: Can't bind qualified name:nlplabs.webfetch.agent/ e Thanx Regards Manish Zedwal On Jan 25, 5:03 pm, Michael Wood wrote: > 2010/1/25 Manish : > > > > > Hi

Re: Help needed regarding the use of macro

I think you'll have to use "exception#" instead of "exception", in order to generate a local symbol. Otherwise, the quoting will try to resolve "exception" in the current namespace. Also, don't expand "~url" more than once -- what if the expression passed for "url" has side effects? It would ge

Re: Help needed regarding the use of macro

Hi On Mon, Jan 25, 2010 at 12:41 PM, Manish wrote: > Hi, > I am new to clojure. I want to use try-catch block to the  (.getPage > *wc* ~url) statement of code. But I am getting this error: > java.lang.Exception: Can't bind qualified name:nlplabs.webfetch.agent/ > exception > > Would u pls help me

Re: Full Disclojure - I Need Topics!

* (ns) in depth, or at least why namespaces need at least one "." * What's this error kit people keep talking about? duck streams? * Using Nailgun to avoid the JVM startup cost for tests in Leiningen (still in flight, see its group) * love, don't fear paredit (I really need this) Thanks for puttin

Re: Promise/Deliver use cases

It might be nice to have a built-in mechanism to get with a timeout. Maybe (await-for ...) could be modified to work on both agents and promises? Note though, that getting a promise with a timeout doesn't require explicitly closing over the promise. The anonymous function that is created in the o

Re: Full Disclojure - I Need Topics!

On 25 Jan, 12:18, Joonas Pulakka wrote: > I would be interested in native / C interoperability; perhaps either > (or both) of these libraries: > > http://github.com/bagucode/clj-native > http://github.com/Chouser/clojure-jna > > And others, if there are similar ones. In general, "the Clojure way o

Re: Clojure Conference Poll

This group works as wave group as well :) 2010/1/24 Seth : > When: weekends > Where: DC, Boston, NY, San Fran > Who: at least one, probably more > > Newsgroups are such a painful way to vote on things. Google Wave or > some other wiki-like thing would make it much easier to aggregate > everyone's

Re: Jython interop

> One approach is to compile the Jython code into a class file. This > requires some work on the Python side (similar to using gen-class in > Clojure so that Clojure code can be called from Java), and the Python > class of interest can't use multiple-inheritance. This approach is > discussed in the

Using Clojure in existing projects

Hi All, I was wondering if anyone has had experience using Clojure in existing applications. I have an application originally written using GWT. I was considering using Clojure to extend some the of the back end processing to do, among other things, data mining (I was originally going to use Com

Re: Clojure Kata

Golf! Yeah! Here the low-level version: (defn sift [pred coll] (letfn [(step [sep [f :as s] xs] (if (or (not s) (pred f)) (cons [sep xs] (sift pred s)) (recur sep (next s) (conj xs f] (lazy-seq (when-let [s (seq coll)]

defn

I am trying to learn clojure by learning the programing by example open wiki book. For an excercise demonstrating iteration they give the following example: (defn factorial ([n] (factorial n 1)) ([n acc] (if (= n 0) acc (recur (dec n) (* acc n) first

Re: newbie question about ns and :require

You may find this ns cheatsheet helpful: http://gist.github.com/284277 Justin On Jan 24, 10:28 am, Manfred Lotz wrote: > Hi all, > I'm stumbling about the very basics. > > Calling clojure like this: > > rlwrap java > -cp > /home/manfred/clojure/clojure.jar:/home/manfred/clojure/clojure-contrib

Re: Clojure Conference Poll

I would suggest Estonia, but Germany is good as well! :) Br, Jevgeni On Jan 23, 3:45 pm, "Heinz N. Gies" wrote: > On Jan 23, 2010, at 12:04 , Boštjan Jerko wrote: > > > > > > > > > On 23.1.2010, at 10:33, Edmund wrote: > > >> East coast for we Europeans ? > > >> On Jan 23, 8:53 am, Christophe Gr

Re: Help needed regarding the use of macro

Hi, On Jan 25, 12:41 pm, Manish wrote: > I am new to clojure. I want to use try-catch block to the  (.getPage > *wc* ~url) statement of code. But I am getting this error: > java.lang.Exception: Can't bind qualified name:nlplabs.webfetch.agent/ > exception > > Would u pls help me to sort out this

Why is this code so slow?

Greetings, I'm new to Clojure and working my way through Project Euler problems for learning. I stuck with problem 7, not with solution, but with performance. My code needs about 90sec to find solution. (ns problem7) (defn no-dividers? "checks if number can be divided with any of divider

Re: newbie question about ns and :require

Hi, Am 24.01.2010 um 16:28 schrieb Manfred Lotz: > user=> (ns my (:require clojure.contrib.classpath)) > nil > my=> > > which to me looks fine. No news is good news. > But why does this fail? > > my=> (classpath) > java.lang.Exception: Unable to resolve symbol: classpath in this > context (N

Re: Clojure Kata

Hi Group, thought this nice puzzle would make a good occasion for a first post. :-) A solution to the original problem from c.l.s, with keywords replacing symbols: (ns sogaard-kata (:use clojure.contrib.seq-utils)) (defn sogaard-kata [xs] (map (fn [[k ys]] (into (vec k) (vec ys))) (p

Re: Clojure Conference Poll

I concur. Columbus, OH is a pretty good location :D [But then, I am just being selfish] In all seriousness, it does act as a pretty central location in the midwest region IMO. Raju On Jan 22, 4:15 pm, Wilson MacGyver wrote: > I vote let's turn this into a clojure vacation, and hold it in an > e

Re: Reminder: IEEE Software Issue on "Multiparadigm Programming"

Dear Mr Wampler, I'm interested in reviewing manuscripts for SI of IEEE Software on "Multiparadigm Programming". Best regards, Dr. Violeta Damjanovic http://sites.google.com/site/vdamjanovic/ On Jan 23, 6:59 pm, Dean Wampler wrote: > Hi, all, > > Apologies for duplicate notices, but I wanted t

Domain Modelling

Hi, I'm an experienced C# / .Net developer and a relative Lisp newbie. In my .Net programming I have taken a lot of design inspiration Domain Driven Design and Eric Evans book in particular. The idea that a developing a strong model of the problem domain is the most important part of application

Re: Clojure Conference Poll

On Sat, Jan 23, 2010 at 1:24 PM, Konrad Hinsen wrote: > On 22 Jan 2010, at 22:15, Wilson MacGyver wrote: > >> I vote let's turn this into a clojure vacation, and hold it in an >> exotic location. >> >> Otherwise, hey, Columbus Ohio is as good as any other city. :) > > My vote is for Paris, France

Re: Clojure Conference Poll

+1 for a European location. I’m in London but Paris & Berlin are both really cool locations. Cheers, Ian. -- 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 a

Re: Jython interop

On Sun, Jan 24, 2010 at 11:26 PM, rob wrote: > Hi, > > I was wondering if anyone has tried somehow calling Jython functions > from within Clojure, and how you went about doing this if so. I have > not used Jython, but I would imagine the Jython interpreter can be > invoked in the same way as any

Re: Announcement: Vijual Graph Layout Library for Clojure Version 0.1

On 22 Jan, 22:06, Conrad wrote: > http://lisperati.com/vijual/ > > Hope some of you find this library useful. Let me know if you have > feature requests or want to help me improve this library. Many thanks! I shall most certainly use this. -- You received this message because you are subscribed

Re: Full Disclojure - I Need Topics!

Hi, On Jan 25, 8:58 am, rb wrote: > * interacting with a database in general, and covering clojureql in > particular Beware the redesign: the ClojureQL DSL is currently revised. The end result is not clear, yet. However it will change. Sincerely Meikel -- You received this message because yo

Re: Cyclic require

No support for cyclical dependencies is biting me too. I'm trying to use one .clj file per protocol&type, which doesn't seem *too* smelly. It's a habit that goes way back... maybe time to revise my worldview :-) If a namespace is intended to be a stratum then I will refactor to fit that. Fewer, la

Re: Full Disclojure - I Need Topics!

I think I have a good topic. How about the intricacies of syntax-quotes and in particular, nested syntax-quotes? When I was first learning Lisp (Common Lisp), I had to struggle with nested syntax-quotes (backquotes) very much. That was until I read Alan Bawden's superb paper on the subject, and P

Clojure Talk in Paris Feb 15th

While I'm in Paris to do some Tapestry training, I'll also be doing a FREE talk on Clojure: "Clojure: Towards the Essence of Programming" The talk is sponsored by SkillsMatter; it's aimed at people who haven't used Clojure before, but if people on the list want to come out to show some support, t

Re: defn

That's defining a function factorial that can be called with either one or two arguments. When called with one argument, it immediately calls itself with two arguments. So the (factorial n 1) call provides acc with an initial value of 1. The ([n] and ([n acc] lines are the declarations of the pa

Re: Full Disclojure - I Need Topics!

>How about the intricacies of syntax-quotes and in particular, nested >syntax-quotes? Yeah, +1. -- 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 moderat

Re: Full Disclojure - I Need Topics!

Rock, Could you please proved a link to Alan Bawden's paper? Thanks, Sean On Jan 25, 9:06 am, Rock wrote: > I think I have a good topic. > > How about the intricacies of syntax-quotes and in particular, nested > syntax-quotes? > > When I was first learning Lisp (Common Lisp), I had to struggle w

Re: defn

wow! So if it is called with 1 argument, then the body of the function is: (factorial n 1) But if it is called with 2 arguments then the body of the function is: (if (= n 0) acc (recur (dec n) (* acc n))) Is this a standard feature of lisp? Sorry I am very noobish. thx! On J

Re: Clojure Conference Poll

I agree that at least part (well I guess that would be half) of the conference should be on a weekend to permit attendance for those with work conflicts. A suggestion that I recall seeing a while ago was to dovetail ICFP 2010 . That would be late September in the

Re: Clojure Kata

Hello, So far, i've encountered the term of "kata" applied to software in a somewhat similar sense as in the martial arts: very detailed step-by-step explanation of how one things about the problem, solves it bit by bit (does he first play with some functions at the REPL, does he start to code fro

Re: Full Disclojure - I Need Topics!

On Jan 25, 2:11 am, mac wrote: > On 25 Jan, 06:50, Mark Engelberg wrote: > > > Debugging techniques, including: > > * How to make sense of Clojure's stack traces. > > * How to use Java debugging and profiling tools with Clojure. > > +1 for this. I haven't had the energy to try any debugging or >

Re: A new lisper's question about a macro

On Mon, Jan 25, 2010 at 3:42 AM, Richard Newman wrote: >> The former is a lot clearer to read, as it uses standard Clojure >> datastructures. > > ... which offers other advantages beyond the human, such as > > (def page-names keys) > > user=> (page-names foobar) > (:page :posts :post) > > Power co

Re: A new lisper's question about a macro

On Mon, Jan 25, 2010 at 3:09 AM, ataggart wrote: > > (zipmap >  (map keyword (take-nth 2 ~params)) >  (map (comp var-get resolve) (take-nth 2 (next ~params > Neat :-) Thanks! - Joel Rosario. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To po

Re: Full Disclojure - I Need Topics!

Sean Devlin napisał(a): > Rock, > Could you please proved a link to Alan Bawden's paper? I guess Rock meant "Quasiquotation in Lisp": https://eprints.kfupm.edu.sa/60346/1/60346.pdf BTW many thanks for your awesome videos. :) Br, Rob -- You received this message because you are subscribed to

Re: Clojure Kata

Laurent, This thread is a set up. Specifically, I'm hoping these guys pick up the blog post: http://www.katacasts.com/ I plan on posting a video in about a week going through everything. Demonstrate the power of the sequence abstraction, and the similarities of regexs and predicates. Show how C

Re: Clojure Kata

ok, great ! :-) 2010/1/25 Sean Devlin : > Laurent, > This thread is a set up.  Specifically, I'm hoping these guys pick up > the blog post: > > http://www.katacasts.com/ > > I plan on posting a video in about a week going through everything. > Demonstrate the power of the sequence abstraction, and

Re: newbie question about ns and :require

Hi, On Sun, 24 Jan 2010 17:07:23 +0100 Meikel Brandmeyer wrote: > > > But why does this fail? > > > > my=> (classpath) > > java.lang.Exception: Unable to resolve symbol: classpath in this > > context (NO_SOURCE_FILE:2) > > Because you used require. Try clojure.contrib.classpath/classpath > i

Re: defn

Yes, that's basically right. I don't know if common lisp has a similar syntax for defining functions with multiple parameter lists, but you'll definitely see it a lot in Clojure code. On Mon, Jan 25, 2010 at 10:22 AM, Glen Rubin wrote: > wow! > > So if it is called with 1 argument, then the bod

Re: Jython interop

Thank you for these good ideas! I'm going to try it. My goal is to use the Natural Language Toolkit in Clojure. I also posted the same question here: http://stackoverflow.com/questions/2129253/clojure-jython-interop Rob On Jan 24, 7:08 pm, Eric Lavigne wrote: > > I was wondering if anyone ha

Re: defn

Glen, learning by example is good, but you should consider backing it with also taking a look at the main documentation pages from clojure.org ! Concerning the topic at hand, you need to "get" : * the syntax for defn : http://richhickey.github.com/clojure/clojure.core-api.html#clojure.core/defn

Re: Full Disclojure - I Need Topics!

Not a precise subject, but something along the lines : "here is how one would do stuff X in a classical mainstream OO language, and now here is how one would do same thing in lisp" could help e.g. java devs cross the bridge. There's been a recent question on the ml regarding the management of big

Re: Full Disclojure - I Need Topics!

Yeah, Quasiquotation in Lisp "https://eprints.kfupm.edu.sa/ 60346/1/60346.pdf", that's the one. I've already posted some material regarding syntax-quote in the Learning Clojure Wiki. As for Bawden's and Graham's tips, it basically all boils down to this (adapted from ACL by Graham): Syntax-quote

Re: Full Disclojure - I Need Topics!

Laurent, Which thread are you referring to? Sean On Jan 25, 11:45 am, Laurent PETIT wrote: > Not a precise subject, but something along the lines : "here is how > one would do stuff X in a classical mainstream OO language, and now > here is how one would do same thing in lisp" could help e.g. ja

Re: Clojure Conference Poll

Amit Rathore wrote: > ok folks, we need some more real opinions... :) > we're thinking it will be in the Bay Area, some time during early > fall. weekend seems logical from the responses so far... I've only counted two votes for the Bay Area as a first choice so far in this thread and one of the

Re: Full Disclojure - I Need Topics!

For anyone interested, I have just added the above material to the Learning Clojure Wiki. I hope you find it useful. Here's the link: http://en.wikibooks.org/w/index.php?title=Learning_Clojure&stable=0&shownotice=1#Nested_Syntax-quotes -- You received this message because you are subscribed to

Re: Full Disclojure - I Need Topics!

2010/1/25 Sean Devlin : > Laurent, > Which thread are you referring to? Found it !, here : http://groups.google.com/group/clojure/browse_thread/thread/2cfb3335f3e5f940# > > Sean > > On Jan 25, 11:45 am, Laurent PETIT wrote: >> Not a precise subject, but something along the lines : "here is how >>

Re: newbie question about ns and :require

On Sun, 24 Jan 2010 12:28:16 -0800 (PST) Justin Kramer wrote: > You may find this ns cheatsheet helpful: > > http://gist.github.com/284277 > > Justin > A good pointer. -- Thanks, Manfred -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post

Re: newbie question about ns and :require

On Sun, 24 Jan 2010 12:33:11 -0800 (PST) ".Bill Smith" wrote: > Manfred, > > The (:require clojure.contrib.classpath) tuple tells the ns function > to load the clojure.contrib.classpath library if it has not already > been loaded. Clojure looks for clojure/contrib/classpath.clj (or the > equiva

Final releases for clojure-contrib 1.0.0 and 1.1.0

Hello all, We are finally ready to release clojure-contrib 1.0.0 and 1.1.0! Major/minor version numbers of contrib match major/minor version numbers of Clojure. So if you're using Clojure 1.0, use contrib 1.0.0; if you're using Clojure 1.1, use contrib 1.1.0. Get pre-built ZIP distributions from

Re: Jython interop

Thanks again Marc, I made a note of it on the StackOverflow thread. On Jan 25, 2:41 pm, Marc Downie wrote: > On Mon, Jan 25, 2010 at 5:34 PM, rob wrote: > > Thank you for these good ideas!  I'm going to try it.  My goal is to > > use the Natural Language Toolkit in Clojure.   I also posted the s

Re: JSR223 interpreters in Clojure - can an interpreter be wrapped in an agent or atom?

On Jan 25, 6:19 pm, Alex Stoddard wrote: > Can someone make some good come of my display of ignorance by > suggesting how Clojure's concurrency primitives can interact > productively with the problem of scheduling method calls on JSR223 > interpreters? I'm not quite sure I understand. Do you mean

tweaking stm parameters?

hi, are there plans for the stm to expose parameters sorta like how jvm gc's do, so people can if need be tweak the stm to better fit their personal application? thanks. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send ema

Re: Why is this code so slow?

Changing (concat primes [k]) to (conj primes k) gave me an order of magnitude performance increase. On Jan 24, 1:19 pm, Nebojsa Stricevic wrote: > Greetings, > > I'm new to Clojure and working my way through Project Euler problems > for learning. I stuck with problem 7, not with solution, but w

Re: Why is this code so slow?

Small things (read: I didn't notice any performance change in my tests)... You can also pull the (. Math sqrt number) into the let binding so it's not calculated every time the anonymous function is called. Also the reduce call in no-dividers? doesn't short-circuit when it hits a false. I'd inst

Re: Full Disclojure - I Need Topics!

Thanks a lot for the videos you've done so far. I watch them all. Here are some ideas for shows, from more Clojure centric to just interesting: * defprotocol, deftype, reify, ... * data-flow programming * pattern matching * monads * performance tuning (unboxed numbers, type hints, ...?) * making

Re: defprotocol and ns best practice?

I think of defprotocol/deftype as a dispatching mechanism to the functions named in the protocol. As such, it doesn't make sense (within the scope of a single namespace) to declare the same function name in two protocols any more than it would make sense to call defn twice with the same name. In

Re: defprotocol and ns best practice?

On Mon, Jan 25, 2010 at 4:29 PM, ataggart wrote: > In the example you present, I'd say you have one protocol with > toString, and say two other protocols, each declaring their own > relevant functions, and a deftype can implement what protocols it > wishes. thanks, that sounds like quite possibly

Re: newbie question about ns and :require

Justin Kramer writes: > You may find this ns cheatsheet helpful: > > http://gist.github.com/284277 That is most helpful. What's not helpful is the weird mix of lists and vectors used by these forms. When I finally made it to :rename accepting a map, I had to take a break. -- Steven E. Harris

Re: newbie question about ns and :require

> What's not helpful is the weird mix of lists and vectors used by these > forms. When I finally made it to :rename accepting a map, I had to take > a break. so, like, this means i /not/ the only one who finds the whole (whatever you want to call it) include/import syntax kinda crazy? phew. -- Y

Re: Domain Modelling

Thanks for the thoughts everyone, I'm having a read through that paper now. I'm still looking for some code to read because while what you are saying makes, I've done so much OOP my brain is having a hard time making the jump. Also added it as an suggestion in this thread if anyone else is intere

Inconsistent behavior in 1.2.0-master w.r.t. previous versions

At the REPL, in 1.2.0-master > (meta (second '(a #^b c))) nil In 1.1.0-new (and I believe all previous versions) > (meta (second '(a #^b c))) {:tag b} Is this intentional, or a bug? Is the new type hint syntax being introduced in 1.2? -- You received this message because you are subscribed t

Re: Inconsistent behavior in 1.2.0-master w.r.t. previous versions

Works for me. user> [*clojure-version* (meta (second '(a #^b c)))] [{:interim true, :major 1, :minor 2, :incremental 0, :qualifier "master"} {:tag b}] -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@google

Re: Inconsistent behavior in 1.2.0-master w.r.t. previous versions

I've double-checked I have the latest from github, cleaned and recompiled, and I'm still getting the same results. user=> [*clojure-version* (meta (second '(a #^b c)))] [{:interim true, :major 1, :minor 2, :incremental 0, :qualifier "master"} nil] Does anyone have an idea what's going on here? O

Re: Inconsistent behavior in 1.2.0-master w.r.t. previous versions

On Mon, Jan 25, 2010 at 10:52 PM, Zach Tellman wrote: > At the REPL, in 1.2.0-master > >> (meta (second '(a #^b c))) > nil > > In 1.1.0-new (and I believe all previous versions) > >> (meta (second '(a #^b c))) > {:tag b} > > Is this intentional, or a bug?  Is the new type hint syntax being > intro

help with serializing/deserializing structs

Hi all, I am writing a distributed program using Clojure. I am trying to write some code to pass structs around to different nodes on the network by serializing and deserializing strings. I do not fully understand how to use *print-dup* and read to do this. The last line of the following gives th

Re: Announcement: Vijual Graph Layout Library for Clojure Version 0.1

Any plans to add SVG support? Seems it would, if anything, be easier than formatting ascii. You could then open it up and color/move stuff. Any ideas about compatibility with graphviz(.org)? Maybe a .dot file export? I've considered making a .dot builder myself. -- You received this message beca

Re: C interop lib (JNA wrapper)

> This looks pretty nice - one question though: is there an API provided > that would let me build callbacks and structs programmatically - as > opposed to the declarative style of defclib? Not currently but it's definetly doable. I already use clojure.asm to generate classes on the fly. I have t

Re: Domain Modelling

On Jan 25, 7:20 pm, Roman Roelofsen wrote: > After playing around with clojureql I noticed how well the relational > data model maps to a functional language. Processing lists (result > sets), joining, filter, group by, etc. are ideas I found in both > worlds. I am currently working on a toy proje