I've been doing some more research on this. This article seems a good
introduction:
http://www.dcc.uchile.cl/~cgutierr/cursos/FDB/p16-bancilhon.pdf
It turns out the naive implementation (a bottom-up fixed point
iterator) is pretty easy to understand, and would not be hard to
implement -- minus
At this point I think maybe a broader more abstract view is in order.
How about watchers for every mutable construct in Clojure?
On Feb 1, 7:12 am, Mark Fredrickson
wrote:
> I know its been discussed before, but I would like to register a
> request for a feature: watchers on namespaces. My ne
+1 for this request. I have a question as well, aren't the namespace
bindings stored in one of clojure's concurrency objects? Since the
ability to interact with a running program is one of the features that
sets clojure apart from most other mainstream programming languages,
if more than one per
Hi,
Am 01.02.2009 um 03:26 schrieb Onorio Catenacci:
(defn init-sheet
#^{:doc "Initialize a worksheet with a particular month"}
([current-month]
(if debugging (println "In init-sheet"))
)
)
You don't need #^ to attach the docstring. In fact your version
I know its been discussed before, but I would like to register a
request for a feature: watchers on namespaces. My needs are simple,
just a callback when something in the namespace changes. It does not
matter to me what binding changed, if something was added, if
something was deleted.
My
On Jan 13, 10:07 am, cliffc wrote:
-snip-
> 5- The debianshootoutresults generally badly mis-represent Java.
> Most of them have runtimes that are too small (<10sec) to show off the
> JIT, and generally don't use any of the features which commonly appear
> in large Java programs (heavy use of v
Some examples...
; using ->
(f1 (f2 (f3 (f4 x
; can be "flattened" to
(-> x f4 f3 f2 f1)
Useful for nested maps...
user=> (def m {:one {:a 1 :b 2 :c {:x 10 :y 11}}} )
#'user/m
user=> (-> m :one :c :x)
10
user=> (-> x :one :b)
2
On Sun, Feb 1, 2009 at 5:31 AM, Jason Wolfe wrote:
>
> On Jan
On Jan 31, 7:09 pm, wubbie wrote:
> Hi,
>
> I saw in ants.clj a notation (->).
> what is it?
> For example,
> (defn place [[x y]]
> (-> world (nth x) (nth y)))
Did you check the docs?
On the website:
http://clojure.org/API#toc21
Within clojure itself:
user> (doc ->)
> I think it means any class that implements java.util.Collection.
To be precise, I think "nil" is also always OK.
Sometimes other seq-able things like Java arrays can be passed too,
although I don't think this is ever promised to work (if it doesn't,
you can always explicitly call seq on them
Hi,
I saw in ants.clj a notation (->).
what is it?
For example,
(defn place [[x y]]
(-> world (nth x) (nth y)))
thanks in advance.
-sun
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On Feb 1, 2:42 am, Mark Volkmann wrote:
> When a function parameter is named "coll", does that generally mean it
> can be any kind of collection except a map?
> For example, the some function takes a predicate function and a
> "coll", but it can't be a map.
I thought all functions with coll took
In Feb 1, 2:32 am, e wrote:
> I don't understand this: (def z (zip/zipper rest rest cons t))
>From the API docs on zipper:
(zipper branch? children make-node root)
The branch? predicate is rest, because if a node has children, then
rest will not be nil, and therefore true.
The children pr
On Jan 31, 6:42 pm, Mark Volkmann wrote:
> When a function parameter is named "coll", does that generally mean it
> can be any kind of collection except a map?
> For example, the some function takes a predicate function and a
> "coll", but it can't be a map.
I think it means any class that imple
> ;For my own reference--this is an example of a Clojure sequence
> comprehension
> (for [current-month [months]]
> (let [current-sheet (init-sheet current-month)])
> )
Two things:
- I think you want (for [current-month months] ...
As-is, this will loop a single time, binding current-
On Sat, Jan 31, 2009 at 8:26 PM, Onorio Catenacci wrote:
>
> Hi all,
>
> I feel like a bloody noob for having to ask this (I've been coding C++
> for years but Clojure, Lisp and Java are all new territory for me) but
> I'm missing something obvious and basic here and I'm still struggling
> with t
Hmm, that's an interesting question. It looks to me like into could
be implemented exactly like clojure.set/union, e.g., (reduce conj to
from), so I'm not sure why it's written the way it is ... I must be
missing something.
Anyway, I think clojure.set/union is just a special case of into, at
lea
When a function parameter is named "coll", does that generally mean it
can be any kind of collection except a map?
For example, the some function takes a predicate function and a
"coll", but it can't be a map.
--
R. Mark Volkmann
Object Computing, Inc.
--~--~-~--~~~-
I don't understand this: (def z (zip/zipper rest rest cons t))
Also, it didn't make sense why down arbitrarily brought you to the left
child. Why wouldn't you have to say, "down-left"?
Thanks.
On Sat, Jan 31, 2009 at 10:03 AM, James Reeves
wrote:
>
> On Jan 31, 3:06 am, Jeffrey Straszheim
> w
Hi all,
I feel like a bloody noob for having to ask this (I've been coding C++
for years but Clojure, Lisp and Java are all new territory for me) but
I'm missing something obvious and basic here and I'm still struggling
with the syntax a bit.
I'm trying to learn clojure by simply translating an
What's the difference between into and clojure.set/union? While their
source code is quite different, they seem to do the same thing to me.
--
R. Mark Volkmann
Object Computing, Inc.
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Yup, that fixed it.
Thanks!
-Conrad
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cloj
clj-record
http://github.com/duelinmarkers/clj-record
Author: John Hume
Category: db
License: MIT
Dependencies: clojure-contrib
Inspired by Rails' ActiveRecord, a convenient persistence API with
support for declarative validations, callbacks, and associations.
--~--~-~--~~---
> Patch welcome.
>
> Rich
http://code.google.com/p/clojure/issues/detail?id=62&colspec=ID%20Type%20Status%20Priority%20Reporter%20Owner%20Summary
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To
Some naive caching code does speed up my sample by 4 times. Will
investigate further later this week, need to take my flu to bed now..
diff --git a/src/jvm/clojure/lang/Reflector.java
b/src/jvm/clojure/lang/Reflector.java
index f530b78..eccebb8 100644
--- a/src/jvm/clojure/lang/Reflector.java
+
That seems simple enough. Thanks.
On Jan 31, 10:03 am, James Reeves wrote:
> On Jan 31, 3:06 am, Jeffrey Straszheim
> wrote:
>
> > Does anyone know of a gentle introduction to the Zipper stuff, and how
> > it is used in Clojure?
>
> My understanding of zippers is that they are a way of efficie
On Jan 30, 8:40 pm, Jon Harrop wrote:
> Apologies if you've seen this before but I just thought it was absolutely
> hillarious:
>
> http://www.3ofcoins.net/2009/01/30/common-lisp-clojure-and-seriousness/
Hey, I have to admit, I was scared when I saw you show up here, but
now I think I understand
Iris looks really good. They seem to have put a lot of work into
multiple, efficient evaluation strategies, and various levels of
expressivity versus safety. That kind of work is priceless.
However, I'm not sure if you can built your own predicates in Java
code (and therefore in Clojure code).
> I'm must be missing something obvious for the [s1 s2] case of union:
>
> Is it only that you've measured (conj s1 s2) to be faster when s2 is
> the smallest ?
Yes, that's it. "conj" iterates through the second argument, and
since count is O(1) for sets, it makes sense to always iterate thro
On Jan 31, 11:41 am, Conrad wrote:
> Hi everyone- I'm a new Clojurist trying to understand how to make use
> of Clojure parallelism... I wrote this simple program that calculates
> the number of prime numbers in a number range. It is purposely
> inefficient:
>
> (defn prime [a]
> (not-any? #(
Hi everyone- I'm a new Clojurist trying to understand how to make use
of Clojure parallelism... I wrote this simple program that calculates
the number of prime numbers in a number range. It is purposely
inefficient:
(defn prime [a]
(not-any? #(integer? (/ a %)) (range 2 a)))
(defn primes [a b]
Hi everyone- I'm a new Clojurist trying to understand how to make use
of Clojure parallelism... I wrote this simple program that calculates
the number of prime numbers in a number range. It is purposely
inefficient:
(defn prime [a]
(not-any? #(integer? (/ a %)) (range 2 a)))
(defn primes [a b]
On Jan 30, 4:00 pm, eyeris wrote:
> While testing Compojure, I've been using the embedded Jetty API. This
> has been convenient for getting up and running quickly. However I
> don't like having to restart my script each time I need to test a
> change.
I'd advise moving the code that starts the J
Name: Roland Sadowski (fyuryu on IRC).
Library name: Clojure+Processing
Library home page URL: http://github.com/rosado/clj-processing/tree/master
Category: visualization, graphics, wrapper
License: Common Public License Version 1.0
Dependencies: a recent version of Processing (processing.org)
De
Hi,
Am 31.01.2009 um 15:55 schrieb André Thieme:
On 31 Jan., 02:47, Jason Wolfe wrote:
I think this behavior is as-intended, although I agree that it is
confusing.
I am worried that you could be right.
That’s why I suggested to modify the doc string of lazy-cat.
In my opinion the real step
Personally, I AOT compile a stub servlet class and load my webapp into
Tomcat. This will require that you set up your directory structure
following the Servlet API spec.
I also have some code in same file that my servlet is defined in that
will start a swank server only if the code is not being c
On Jan 31, 3:06 am, Jeffrey Straszheim
wrote:
> Does anyone know of a gentle introduction to the Zipper stuff, and how
> it is used in Clojure?
My understanding of zippers is that they are a way of efficiently
navigating a tree data structure in a functional manner. So if we have
the tree:
I've been playing around with clojure on the android platform. To my
surprise it was pretty easy to get running, after removing the bean
method from the clojure.jar as hinted by Rich somewhere. Of course
clojure code needs to be compiled AOT and eval doesn't work, as was to
be expected, but all
On 31 Jan., 02:47, Jason Wolfe wrote:
> I think this behavior is as-intended, although I agree that it is
> confusing.
I am worried that you could be right.
That’s why I suggested to modify the doc string of lazy-cat.
In my opinion the real step that needs to be done is to go away
from making ni
Ok, I take it back. (no pun intended)
I know that this used to be a problem, but looking through my email
history, it appears that the over-eager take was reported by Chouser,
and subsequently fixed by Rhickey.
On Sat, Jan 31, 2009 at 9:47 AM, André Thieme
wrote:
>
> On 31 Jan., 02:44, Daniel R
On 31 Jan., 02:44, Daniel Renfer wrote:
> user=> (take 0 (lazy-cat [(println 10)] [(println 20)]))
> 10
> nil
>
> What you see here is not an issue with lazy-cat, but rather an issue
> with take. The current implementation of take evaluates one more than
> the n passed to it.
I don’t think so:
I'm considering implementing a small web app using Compojure. I don't
have much experience with Jetty or any other web server save Apache.
While testing Compojure, I've been using the embedded Jetty API. This
has been convenient for getting up and running quickly. However I
don't like having to r
On Jan 30, 2009, at 6:16 PM, Stephen C. Gilardi wrote:
>> A minor annoyance of mine is that clojure.main exits if there is an
>> exception in an --init file, even if you ask for a repl. i.e.
>
>
> +1 in favor of fixing this.
>
Patch welcome.
Rich
--~--~-~--~~~---~
I'm must be missing something obvious for the [s1 s2] case of union:
Is it only that you've measured (conj s1 s2) to be faster when s2 is
the smallest ?
(defn un
([s1 s2]
(reduce conj s1 s2))
... )
user=> (def a #{1 2 3})
user=> (def b #{4 5 6 7})
user
Hello,
I'd like to separate dosync and other funcs as follows.
Any comment? Essentially I want to allow more concurrency.
(if true
(do
(dosync (ref-set r1 1))
(non-ref setting fun))
(else-fun))
Instead of
(if true
(dosync
(ref-set r1 1)
(non-ref setting fun))
Check out the comment left by Blue Phil. Priceless.
On Jan 31, 6:40 am, Jon Harrop wrote:
> Apologies if you've seen this before but I just thought it was absolutely
> hillarious:
>
> http://www.3ofcoins.net/2009/01/30/common-lisp-clojure-and-seriousness/
>
> --
> Dr Jon Harrop, Flying Frog Con
Hi,
Am 31.01.2009 um 12:44 schrieb Jan Rychter:
Phrased differently, I don't understand the utility of StructMaps.
At the moment struct-maps are an optimisation for the
case that you have a lot of maps of the same type.
struct-maps share there key information. No more, no less.
Sincerely
Mei
Daniel,
Last night I updated clj-doc so that it should run without problems:
if you're willing to try it out I'd be willing to fix any problems
that you come up against and let me know about. At this point there
are still rough edges that I want to fix and features that I want to
add (see the TOD
'lo,
Well I just got a very very basic clojure program working from OSGi (Apache
Felix), although its not yet as I'm still seeing some weirdness, but
hopefully I should have something to write about in the morning, anyway, I
had to patch clojure's RT class slightly in order to get it to work:
dif
David Nolen writes:
> At this point you have to roll your own, I have an experimental thing I plan
> on fleshing out temporarily called CLJOS. I've implemented field
> inheritance, type inheritance, basic multiple inheritance, basic
> introspection. Search the mailing list for CLJOS and you'll s
Stuart Sierra writes:
> On Jan 30, 1:09 pm, Jan Rychter wrote:
>> From what I read, the reasoning is that Clojure provides extremely
>> general multimethods where you have to define a dispatch function. On
>> the object side, there is metadata and you can do with it whatever you
>> want. But thi
Hi,
Am 31.01.2009 um 02:19 schrieb CuppoJava:
(defn new_sprite_engine []
...
(add_sprite (new_cursor_sprite))
...)
So, my code (I think) is pretty well separated in terms of
responsibility. But as it's structured right now, I can't load the
file. Is there an elegant way of going about this?
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