I was perplexed too but I think most( or all ) of the concurrency
features in Clojure is based on java.util.concurrent. I might be wrong
about this though.
So once you start programming java.util.concurrent you can learn
clojure STM. Someone who has more expertise can comment about this.
Thanks,
On 05/19/2011 02:06 AM, Sean Corfield wrote:
I've actually found the Clojure community to be one of the most
welcoming and most helpful of almost any technology that I've picked
up in about 30 years. YMMV, I guess, and I'm sure it depends on your
programming background.
Same here, except 30 ye
On Thu, May 19, 2011 at 3:13 AM, MohanR wrote:
> I was perplexed too but I think most( or all ) of the concurrency
> features in Clojure is based on java.util.concurrent. I might be wrong
> about this though.
Certainly some of them are. Promise/deliver uses CountDownLatch. Atom
unsurprisingly is
So I think readng the actual STM source with Java' features might
help.
Are there actually books on this topic ? Peter Van roy's Data flow
concurrency book ?
Thanks,
Mohan
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Hello
I wonder if I could ask for advice on how to construct a lazy sequence. My
application might be of interest to some of you.
The context for this is that I have an embedded system with very limited
facilities for proper debugging.
I have inserted a 'trace' facility in the embedded code that
Hi,
how about this?
(def sentence-spec {1 {:n 2 :fmt "[1] a=%d b=%d"}
4 {:n 0 :fmt "[4]"}
5 {:n 1 :fmt "[5] z=%d"}})
(defn input-reader
[inputQ eof?]
(fn [byteArray]
(.put inputQ (or byteArray eof?
(defn input-bytes
[inputQ eof?]
(->> (rep
See the source of clojure.contrib.duck-streams/read-lines
http://clojuredocs.org/clojure_contrib/clojure.contrib.duck-streams/read-lines
For the second question: Use read-lines directly.
If you want a lazy-seq that doesn't close the stream when it's empty,
; untested
(defn take-bytes [rdr]
(
I think there are a few things most people agree about:
- The people in the comunity are genaraly very nice and help noobs
(stackoverflow, irc. mailinglist ...)
- Clojure.org has very cool content.
- Clojure.org is not a good place for noob
So i propose some things that I think would make a bette
Given the following function
(defn proint-down-from [x]
(when (pos? x)
(println x)
(recur (dec x
What role does the ? operator play. It looks like it is creating a
variable name.
Thanks.
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Hi,
The ? is merely a convention used to name predicate functions
(ie. functions that return true or false).
It is not enforced, but clojure.core follows it. It's a good idea to follow
it.
I think ruby has a similar convention.
Thanks,
Ambrose
On Thu, May 19, 2011 at 9:09 PM, octopusgrabbus wro
? isn't an operator, it is part of a function's name.
user=> (doc pos?)
-
clojure.core/pos?
([x])
Returns true if num is greater than zero, else false
nil
user=>
Hope that helps!
Alex
On Thu, May 19, 2011 at 8:09 AM, octopusgrabbus
wrote:
> Given the following function
> What role does the ? operator play. It looks like it is creating a
> variable name.
> Thanks.
>
In clojure (and other languages like Ruby) the ? is not an operator, it's
actually part of the function name. Normally ? means that the function
returns a boolean. Think of it as asking a question, s
Hi,
? is not an operator, but part of the name "pos?". pos? is a function, which
returns true if a number is positive, false otherwise.
Function names ending in "?" by convention indicate that they return a
boolean value (true or false). They are called "predicates".
Sincerely
Meikel
PS: In f
Many Thanks. I'm interested in learning Clojure and not everything is
obvious in books.
On May 19, 9:20 am, Meikel Brandmeyer wrote:
> Hi,
>
> ? is not an operator, but part of the name "pos?". pos? is a function, which
> returns true if a number is positive, false otherwise.
>
> Function names e
Hi!
I am thinking about using Clojure for distributed NLP.
Being an absolute newbie in Clojure I look for nice expressive code
snippets.
For example, I need an easy way to read text files such as in the
following Python code:
>>> for line in open("file.txt"):
... for word in line.split():
... if w
Hi,
something like the following should work.
(with-open [rdr (java.io.FileReader. "file.txt")]
(doseq [line (line-seq rdr)
word (.split line "\\s")]
(when (.endsWith word "ing")
(println word
Sincerely
Meikel
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There is clojure.contrib.duck-streams/read-lines
http://clojuredocs.org/clojure_contrib/clojure.contrib.duck-streams/read-lines
Then it's a matter of
(filter (partial re-matches #".*ing") (read-lines "/path/to/file"))
Jonathan
On Thu, May 19, 2011 at 4:52 PM, Meikel Brandmeyer wrote:
> Hi,
>
On Apr 23, 9:38 am, Shantanu Kumar wrote:
> > 5. Provide a mode to prevent write operations
>
> > Interesting idea but isn't that better handled by grants on the user
> > accessing the database?
>
> The intention here is to proactively prevent errors from a development
> standpoint. And then, so
On 18 May 2011 18:54, Emeka wrote:
> David,
> How is Clojure doing in Africa?
There really aren't that many people using it among the people that I
have spoken to. I've worked in the UK, Europe and the US and in
comparison South Africa is a little bit behind and quite conservative
when it comes t
I think there can be multiple words on each line, so they have to be split
into words first. Maybe something like:
(ns example
(:use [clojure.contrib.duck-streams :only (read-lines)]))
(let [lines (read-lines "file.txt")
words (mapcat #(.split % "\\s") lines)
ing-words (filter (pa
I think line-seq needs a java.io.BufferedReader instead of a
java.io.FileReader. clojure.java.io has a reader function that constructs a
java.io.BufferedReader from a filename, so this worked for me:
(ns example
(:use [clojure.java.io :only (reader)]))
(with-open [rdr (reader "file.txt")]
Oops. Just noticed that the original was not quoted in either of my
previous emails, which makes things really confusing. My first reply (the
one using read-lines) was an extension of odyssomay/Jonathan's code, and the
second (with reader) was an extension of Meikel's code. Sorry guys.
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Hi, I started learning clojure for a few months and this is what I have for
the problem, and I find it running very slow if exceeding 100k trials, maybe
it's because of using set? Any feedbacks will be appreciated. thx
(require '[clojure.set :as set])
(def doors #{:a :b :c})
(defn rand-nth-set
I had a similar issue with an existing project - it went away when I
created a new project and did "lein deps".
On May 18, 11:39 pm, Tassilo Horn wrote:
> Exception in thread "main" java.lang.IllegalArgumentException: No value
> supplied for key: 55298
>
> I have to say that this project uses a
On May 19, 6:52 pm, Meikel Brandmeyer wrote:
> Hi,
>
> something like the following should work.
>
> (with-open [rdr (java.io.FileReader. "file.txt")]
> (doseq [line (line-seq rdr)
> word (.split line "\\s")]
> (when (.endsWith word "ing")
> (println word
>
> Sincerely
>
Just in case I'll mention that Meikel's use of (with-open) will
automatically close the reader.
On May 19, 11:40 am, dokondr wrote:
> On May 19, 6:52 pm, Meikel Brandmeyer wrote:
>
> > Hi,
>
> > something like the following should work.
>
> > (with-open [rdr (java.io.FileReader. "file.txt")]
> >
On Thu, May 19, 2011 at 12:52 PM, siyu798 wrote:
> Hi, I started learning clojure for a few months and this is what I have for
> the problem, and I find it running very slow if exceeding 100k trials, maybe
> it's because of using set? Any feedbacks will be appreciated. thx
> (require '[clojure.se
On May 18, 5:06 pm, Sean Corfield wrote:
> I've seen a number of people struggle with the instructions here:
>
> http://clojure.org/getting_started
>
> Let's walk thru the process from a complete n00b's p.o.v. (since this
> is the Getting Started page)...
>
> First thing discussed, the github repo
Update-proxy is not thread-safe. I took a look at the guts of it and:
(. cv (visitField (+ (. Opcodes ACC_PRIVATE) (. Opcodes ACC_VOLATILE))
fmap (. imap-type (getDescriptor)) nil nil))
i.e. there's a private volatile mutable field rather than atom holding
the function m
That was very helpful - thanks Meikel and Jonathon.
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The official way to get started has way too many sharp edges
(Download JDK, install, set JAVA_HOME, add JAVA_HOME/bin to path, download
clojure.zip, extract, sacrifice chicken, run java -cp clojure.jar clojure.main)
... at which point you get a kinda crappy REPL. Oops.
Compare to (on linux):
sud
On Thu, May 19, 2011 at 5:35 PM, pmbauer wrote:
> The official way to get started has way too many sharp edges
> (Download JDK, install, set JAVA_HOME, add JAVA_HOME/bin to path, download
> clojure.zip, extract, sacrifice chicken, run java -cp clojure.jar
> clojure.main) ... at which point you get
Hi Armando,
I'm working on a Clojurej library for sentiment analysis which doesn't contain
everything you'd want for nlp but quite a nice subset of input modules (plain
text corpora, rss feeds, html, etc...),
tokenising/normalising filters (noise removal, porter stemmer, etc),
distance/similarit
Found a new bug and it's a head-scratcher. Autocomplete quit working
sometime overnight. Now I get a SocketException message "Software
caused connection abort" if I hit control-space at the REPL. REPL
process is connected OK -- I can evaluate forms at it -- so it's not
the REPL-to-Eclipse socket co
>
> The recommended way definitely should be one of the painless installs.
> This works:
>
> * Download NetBeans, configuring on the NB homepage for J2SE, and run
> installer
>
So does this:
>
> * Download Eclipse J2SE
>
Sure, but that's still a lot of work just to get a simple repl.
Th
On Thu, May 19, 2011 at 5:47 PM, Andreas Kostler
wrote:
> Hi Armando,
> I'm working on a Clojurej library for sentiment analysis which doesn't
> contain everything you'd want for nlp but quite a nice subset of input
> modules (plain text corpora, rss feeds, html, etc...),
> tokenising/normalisin
On Thu, May 19, 2011 at 5:50 PM, pmbauer wrote:
>> The recommended way definitely should be one of the painless installs.
>> This works:
>>
>> * Download NetBeans, configuring on the NB homepage for J2SE, and run
>> installer
>>
>> So does this:
>>
>> * Download Eclipse J2SE
>
> Sure, but
On Thu, May 19, 2011 at 5:48 PM, Ken Wesson wrote:
> Found a new bug and it's a head-scratcher.
And right on its heels, another one. CCW's REPL seems to have the
desirable property that ctrl-dn at the most recent history item gets
you a blank prompt. Or rather, it did. Now it gives me
*clojure-ve
>
> If ALL you want is a SIMPLE repl you can just go to the tryclojure site. :)
>
Not quite.
As far as official disto's go, the current state is a little raw for getting
started
And having the official getting started instructions be (as you suggested)
"So now you go download this 100MB IDE" is
Scala gets parallel collections (i.e. leverage multi-core CPUs)
http://www.infoq.com/news/2011/05/scala-29;jsessionid=BCF6B009442F5F0D9C18A06D3790C3DA
just to give this thread a new spark...:)
2011/5/19 Ken Wesson
> On Thu, May 19, 2011 at 5:50 PM, pmbauer
> wrote:
> >> The recommended way de
On Thu, May 19, 2011 at 5:58 PM, pmbauer wrote:
>> If ALL you want is a SIMPLE repl you can just go to the tryclojure site.
>> :)
>
> Not quite.
> As far as official disto's go, the current state is a little raw for getting
> started
> And having the official getting started instructions be (as yo
On Thu, May 19, 2011 at 6:02 PM, Ken Wesson wrote:
> On Thu, May 19, 2011 at 5:58 PM, pmbauer wrote:
>> "So now you go download this 100MB IDE" is a little heavy. No?
> Don't forget the JDK alone weighs in at three-quarters of that:
>
> jdk-6u25-ea-bin-b03-windows-i586-27_feb_2011.exe, 76.69 MB
On Thursday, May 19, 2011 4:38:17 PM UTC-4, Ken Wesson wrote:
>
> On Thu, May 19, 2011 at 12:52 PM, siyu798 wrote:
> > Hi, I started learning clojure for a few months and this is what I have
> for
> > the problem, and I find it running very slow if exceeding 100k trials,
> maybe
> > it's becau
Mmm, not quite.
Doesn't clojure run just fine with the 15MB JVM?
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On Thu, May 19, 2011 at 6:16 PM, siyu798 wrote:
> On Thursday, May 19, 2011 4:38:17 PM UTC-4, Ken Wesson wrote:
>> On Thu, May 19, 2011 at 12:52 PM, siyu798 wrote:
>> > (set/difference doors opened-door picked-door)
>>
>> Shouldn't that be wrapped in (first ...) or somethin
On Thu, May 19, 2011 at 6:00 PM, László Török wrote:
> Scala gets parallel collections (i.e. leverage multi-core CPUs)
>
>
> http://www.infoq.com/news/2011/05/scala-29;jsessionid=BCF6B009442F5F0D9C18A06D3790C3DA
>
> just to give this thread a new spark...:)
>
Clojure used to have parallel collec
On Thu, May 19, 2011 at 6:36 PM, David Nolen wrote:
> On Thu, May 19, 2011 at 6:00 PM, László Török wrote:
>>
>> Scala gets parallel collections (i.e. leverage multi-core CPUs)
>>
>>
>> http://www.infoq.com/news/2011/05/scala-29;jsessionid=BCF6B009442F5F0D9C18A06D3790C3DA
>>
>> just to give this
On Thu, May 19, 2011 at 6:17 PM, pmbauer wrote:
> Mmm, not quite.
> Doesn't clojure run just fine with the 15MB JVM?
Do you mean the JRE? And if so: for development, rather than just deployment?
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On Thursday, May 19, 2011 6:36:34 PM UTC-4, Ken Wesson wrote:
>
> On Thu, May 19, 2011 at 6:16 PM, siyu798 wrote:
> > On Thursday, May 19, 2011 4:38:17 PM UTC-4, Ken Wesson wrote:
> >> On Thu, May 19, 2011 at 12:52 PM, siyu798 wrote:
> >> >(set/difference doors opened-do
I'm beginning to think this has degenerated a bit into argument for
arguments sake.
Yes, JRE. You don't need the JDK to read/eval .clj files. And in the
context of where this all started, namely, critiques to the current getting
started experience for new users, a 75MB JDK + 100MB IDE is exact
On May 18, 11:39 pm, Tassilo Horn wrote:
> I tried it by first deinstalling any clojure/swank/SLIME packages I
> had. Then I installed clojure-mode 1.9.0 from the marmalade-repo.
>
> In a terminal, I did
>
> $ lein upgrade # ==> 0.6.3
> $ lein plugin install swank-clojure 1.4.0-SNAPSHO
Just adding my +1 - as someone relatively new to clojure, leiningen is a
great way to get up and running, for a reasonably experienced developer.
(It's a big improvement on when I first tried clojure a couple of years
ago!)
There seem to be windows instructions at
https://github.com/technomancy/le
pmbauer wrote:
>I'm beginning to think this has degenerated a bit into argument for
>arguments sake.
>
>Yes, JRE. You don't need the JDK to read/eval .clj files. And in the
>context of where this all started, namely, critiques to the current
>getting
>started experience for new users, a 75MB J
On Thu, May 19, 2011 at 12:16 AM, Thorsten Wilms wrote:
> After initially installing a Clojure package on Ubuntu, I then learned that
> it was totally unnecessary for a project using Leiningen ...
Yeah, part of me wishes that Leiningen would get official endorsement
as "the" build tool for Clojur
On Thu, May 19, 2011 at 7:13 PM, pmbauer wrote:
> Lein is one such option, but unlikely to get official recognition giving
> clojure/core's (arguably correct) decision to stick to maven.
Talk about a heavyweight, intimidating experience. :)
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On Thu, May 19, 2011 at 7:43 PM, mike.w.me...@gmail.com wrote:
> The "download the massive IDE" path seems to presume that a newcomer
> actually needs something more than "a simple REPL" in order to get started.
> I'd claim that's wrong - at least in a world where any computer you'd run
> clojure
On Thu, May 19, 2011 at 6:43 PM, siyu798 wrote:
>> There's a difference between :a and #{:a}, though, and it will cause
>> the switch case to never win since if prize-door is :a and picked-door
>> ends up #{:a} they won't compare equal.
>
> prize-door is a set
Eh. Your implementation is a bit ...
Hi Ken,
I hadn't thought of using explicit metadata for this purpose, I guess
I was thinking that the class of the object would determine what it
could do.
Just working through this, if we take your example above, what if I
wanted to override the 'put' method rather than define a new one,
since w
Google just launched and interesting power tool to clean up messy data which
you might want to look at:
http://code.google.com/p/google-refine/wiki/Screencasts
Sounds pretty nifty isn't it?
What they do not mention in the screencast (or anywhere else for that
matter), is that it comes with cloju
It's not really the Emacs tools that are a problem, but the huge
amount of web pages trying - with good intentions - to help you
installing the Emacs-Clojure stack, but usually lacking some important
detail. It feels like playing a jig-saw puzzle without being able to
look at the picture on the box
It's a way older older version of clojure but it's in there. I've played
around with it.
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Phil Hagelberg writes:
Hi Phil,
>> $ lein upgrade # ==> 0.6.3
>> $ lein plugin install swank-clojure 1.4.0-SNAPSHOT
>
> There is no Leiningen version 0.6.3--I'm assuming you're running
> 1.5.2?
Ups, you are correct. ;-)
>> Reflection warning, swank/util/io.clj:15 - call to java.lang
On Thu, May 19, 2011 at 11:26 PM, Lachlan wrote:
> Just working through this, if we take your example above, what if I
> wanted to override the 'put' method rather than define a new one,
> since we don't have access to 'proxy-super'. For example making a map
> that enforces storage of dates in a
On Fri, May 20, 2011 at 2:54 AM, Ken Wesson wrote:
> => (def r (put (DateMap. {}) :foo (java.util.Date.)))
> #'user/r
> => r
> {:foo "Thu May 19 22:44:37 PDT 2011"}
> => (get-as-date r :foo)
> #
Bah, copy and paste error. Test it and you'll find it works
regardless. Somehow I got the result from
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