It would be nice if the compiler handled these things with greater
cleverness. In the mean time, some macros might be in order.
I'd also like to add that clojure.core is not generally an exemplar of style. :)
-Per
On Wed, Mar 24, 2010 at 11:58 PM, Sean Devlin francoisdev...@gmail.com wrote:
On 25 Mar, 01:16, Mark Engelberg mark.engelb...@gmail.com wrote:
I tried following Rob Wolfe's zip file instructions. The bin\lein deps
command seemed to work fine, but when I then invoked bin\repl, I got the
following error:
[...]
jfr wrote:
Hello,
I've just started to play a little bit with clojure to get a feel for
the language. It seems to be quite interesting (and it's a relief to
leave my clumsy IDE behind and use Emacs). Concerning immutable data:
Is the following code ok or should (must) I use transients as
Is this it?
http://www.assembla.com/spaces/clojure/tickets/259
On Mar 23, 8:26 pm, Mark J. Reed markjr...@gmail.com wrote:
As far as I can tell, you're doing nothing wrong and just hitting a
bug in Clojure. Which is still in 1.2.0-master...
On Tue, Mar 23, 2010 at 11:43 AM, Konstantin
I thank all the people who have sent me solutions to my Conj
problem. Unfortunately, none of them seem to work.
The issue is adding a value to a defined vector - (def savedColors
[black, white])
One solution was given as: (swap! savedColors conj newcolor)
This produces still the following
On Thu, Mar 25, 2010 at 6:52 PM, WoodHacker ramsa...@comcast.net wrote:
I thank all the people who have sent me solutions to my Conj
problem. Unfortunately, none of them seem to work.
The issue is adding a value to a defined vector - (def savedColors
[black, white])
One solution was given
Hi,
I've no idea whether this is reasonable but when I read your post
suddenly the following thought appeared...
What if defn would accept either a vector for the parameters or a map?
(defn foo {:dont know :what for}
;; ...
)
I did no deeper thinking on this at all, er, skip the deeper, I
Would a Clojure app benefit sigificantly from a declarative functional
UI along the lines of
Lunascript http://www.asana.com/luna or FlapJax http://www.flapjax-lang.org/
?
The results look quite impressive ... but I don't have much to compare
to in Clojure. I am relatively new to both Clojure and
That's the one. But the solution given by the bug reporter doesn't
address the case that came up on this thread, since it's not the class
of the invocant but the types of the parameters that prevent the match
from being found.
On Thu, Mar 25, 2010 at 7:06 AM, atucker agjf.tuc...@googlemail.com
Hi,
Interesting. Seems more readable, more DRY, indeed. Especially if this
becomes idiomatic for optional named arguments ...
And the general case could be:
(defn funkymonkey [x y z {:keys [[a -1] [b -2] [c -3]], d :d, e [:e
-4], :or {b -3, g -6}} [x y z a b c])
?
Which leads to the
I fixed a couple of other issues, most of which show only on Windows.
You should see Kanjis now on the right-hand side when drawing.
Eugen
On Mar 23, 5:30 pm, Zmitro Lapcjonak idob...@gmail.com wrote:
On Mar 17, 4:56 pm, Eugen Dück eu...@dueck.org wrote:
The complete jnlp can be found
Right. Let's make this clear: outside of the Java interoperability
stuff, you cannot change the value of a variable in Clojure. Ever.
All the data types are immutable; you can only build new values on top
of existing ones, not modify the old ones.
When you conj something onto a vector, it
I agreed with you until I had to go over every single line of the
thing, in order. It actually reads pretty well from top to bottom.
Then again, some functions are by necessity just plain nasty.
On Mar 25, 2:02 am, Per Vognsen per.vogn...@gmail.com wrote:
It would be nice if the compiler
Question on best practices on handling SQL database concurrency issues
I am pmapping a evaluation to a long list (which calls a
computationally intense script) from within clojure. The script
itself is designed to be completely free of concurrency side-effects.
During the evaluation, several
Isn't programming not all about cheating the computer in doing what you want
it to do? In the book programming clojure you can find an example with locks
as well.
2010/3/25 Scott sbuck...@gmail.com
Question on best practices on handling SQL database concurrency issues
I am pmapping a
id prefer best practices if possible
typically, cheating has consequences down the line
On Mar 25, 10:43 am, Joop Kiefte iko...@gmail.com wrote:
Isn't programming not all about cheating the computer in doing what you want
it to do? In the book programming clojure you can find an example with
Are the writes commutative? Since you are using pmap, I presume so. In
that case, you could funnel the writes through an agent serving as a
queue.
-Per
On Thu, Mar 25, 2010 at 9:59 PM, Scott sbuck...@gmail.com wrote:
id prefer best practices if possible
typically, cheating has consequences
Hi,
maybe you can put finished work packages into a Queue and have a
(different) thread reading them from the queue and writing them to the
database linearly. So the workers don't have to know about the
database and the DB writer doesn't have to care for the computation.
Since you can't write to
Ok, I just looked at frequencies as Miki suggested.
(reduce #(assoc %1 %2 (inc (get %1 %2 0))) {} [One Two Two
Three Three Three])
would be more like it. Thanks for the infos...
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To post to this group,
Thanks I will take a look at it .Neverless, the idea was to write my
own code ;-)
You can also use frequencies from c.c.seq-utils (http://
richhickey.github.com/clojure-contrib/seq-api.html#clojure.contrib.seq/
frequencies)
HTH,
--
Miki
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I would suggest using a more concurrency-aware database. I've had luck
with H2 (http://www.h2database.com/). It supports mixed local and
remote connections in a thread-safe manner. Additionally it supports
simple clustering, sounds like you could have use for such.
Best Regards,
Joonas
--
You
Is it as simple as moving to a better database, such as
mySQL?
PostgreSQL is considerably better (even than MySQL, which still uses
locks AFAIK)
for anything concurrent. The PostgreSQL is using multiple version
concurrency (MVC)
approach - the same approach the clojure STM is using.
The
thanks for your suggestions
two clear options 1) agents and queued transactions 2) MVC enabled
databases (postgresql, h2 (neat project))
Ill try the first option and see how it scales, and worst case move to
the second
Thanks again
Scott
On Mar 25, 12:47 pm, prhlava prhl...@googlemail.com
I know it's not Clojure, but you can at least scratch the Lisp on the
iP* itch.
Scheme for the iPhone:
http://jlongster.com/software/iphone/scheme-iphone-example/
http://jlongster.com/blog/2010/02/23/farmageddon/
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I published a blog post earlier today, along with a short screencast
that might be of interest:
Like any group of super-smart programmers using a relatively new
language, a lot of folks in the Clojure community have looked at
existing build tools (the JVM space is the relevant one here,
Chas Emerick cemer...@snowtide.com writes:
I published a blog post earlier today, along with a short screencast
that might be of interest:
Like any group of super-smart programmers using a relatively new
language, a lot of folks in the Clojure community have looked at
existing build tools
On Mar 25, 11:55 am, Chas Emerick cemer...@snowtide.com wrote:
I published a blog post earlier today, along with a short screencast
that might be of interest:
Like any group of super-smart programmers using a relatively new
language, a lot of folks in the Clojure community have looked at
On Mar 25, 2010, at 6:08 PM, Rob Wolfe wrote:
No, XML is not the worst thing (at least for me).
The real problem is here:
http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
I'm not sure what you're referring to there. :-)
Let's suppose that from time to time
On Mar 25, 2010, at 19:55 , Chas Emerick wrote:
I published a blog post earlier today, along with a short screencast that
might be of interest:
Like any group of super-smart programmers using a relatively new language, a
lot of folks in the Clojure community have looked at existing build
I am trying to convert a long string of numbers to a number, but get a
java.lang.numberformatexception
My long string of numbers has new line characters in it, so I am
filtering out the newline characters before converting it back to a
string. Then I try to use Integer. on it but get the above
Brian,
FWIW, I'd claim that maven does deliver on all five points you list.
Of note is that it absolutely is IDE-agnostic (I used NetBeans in the
screencast because that's what I use -- you can load up maven-defined
projects in Eclipse and IntelliJ just as easily). I'm not an emacs
Glen,
You want (java.math.BigInteger. 2342343...). java.lang.Integer is
limited to 2^31-1.
- Chas
On Mar 25, 2010, at 6:40 PM, Glen Rubin wrote:
I am trying to convert a long string of numbers to a number, but get a
java.lang.numberformatexception
My long string of numbers has new line
On Mar 24, 10:57 am, Mark J. Reed markjr...@gmail.com wrote:
On Tue, Mar 23, 2010 at 8:19 PM, Raph mart...@gmail.com wrote:
(My opinion, anyway.I think a byte should be 8 bits and I should be able to
use all of them.)
Er, it is, and you can. A Java byte still gives you all 8 bits' worth
Clojure can be used in so many different ways. I can't think of any
other language where I have so many varied integration options. The
flexibility is confusing and frustrating, but I much prefer its
presence than absence. :) I'm glad I stuck with it.
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I was thinking it might be interesting to see if we could integrate Bespin
Embedded in labrepl, having a nice web based syntax highlighting editor
thats consistent on platforms could be quite cool.
--
Pull me down under...
On Wed, Mar 24, 2010 at 4:26 AM, Stuart Halloway
On Thu, Mar 25, 2010 at 6:17 PM, Brian Carper briancar...@gmail.com wrote:
Ruby: gem install X
Perl: perl -MCPAN -e shell, then install X
If you're just installing CPAN module X, then on most installations
all you need to run is this:
cpan X
You can still go into the interactive shell if
I have a function that I use for adding a JPanel to a ui atom. When I
call swap! that ui atom is sent to that function I call with the swap!
on and is dereferenced inside the function so I don't need to call @ui
on it. However, I want to add listeners to my JPanel that can affect
that atom, but
I would just pass the atom and move the @ inside the function...
On Thursday, March 25, 2010, strattonbrazil strattonbra...@gmail.com wrote:
I have a function that I use for adding a JPanel to a ui atom. When I
call swap! that ui atom is sent to that function I call with the swap!
on and is
I am in complete agreement! Clojure continues to hinder itself by not
providing an official executable. java -cp clojure.jar was good enough
for Clojure 0.9, but that's not where it is anymore.
Even simple things like submitting bug reports would be helped by
having a default clj executable. It
For whats it worth here - IntelliJ IDEA will automatically add maven
dependencies to you pom.xml file for unknown classes ( in java source, not
the clojure plugin - yet), for example if you type com.cemerick.Foo in
your source, and its an unknown class, the intention dialog gives you
options of
Though it might not be the best option here, the Clojure reader is
always ready to serve:
user (type (read-string 123))
java.lang.Integer
user (type (read-string 123123123123123))
java.lang.Long
user (type (read-string 123123123123123123123123123123123123))
java.math.BigInteger
Of course, it
Of course, it might also pose a bit of a security threat:
user (read-string #=(println \I OWN YOU NOW!\))
I OWN YOU NOW!
nil
:)
user= (binding [*read-eval* false]
(read-string #=(println \I OWN YOU NOW!\)))
java.lang.RuntimeException: java.lang.Exception: EvalReader not
allowed when
Another unadvertised function that is useful to be aware of is
clojure.lang.Numbers/reduce which will simplify a number to its most simple
type. I often find that I want to use some BigInteger function, but then it
is important to turn it back into a typical Clojure number at the end.
For
In those hills yonder in the lands of Common Lisp, it's usually
considered good practice to blast the entire read table save for what
you need when you deal with untrusted data. Barring that, a better
option might be a more modular reader: read-number, read-symbol, etc.
-Per
On Fri, Mar 26, 2010
In those hills yonder in the lands of Common Lisp, it's usually
considered good practice to blast the entire read table save for what
you need when you deal with untrusted data. Barring that, a better
option might be a more modular reader: read-number, read-symbol, etc.
Clojure doesn't have a
I'm trying to track down the reason that I sometimes see a lot of concurrency
in my system (up to 1200% CPU utilization on a dual quadcore mac that also has
some kind of hyperthreading, allegedly allowing a maximum of 1600% CPU) while
other times it gets stuck at around 100-200%. My system (a
Clojure calls out to Java's java.lang.Math.Random:
This method is properly synchronized to allow correct use by more
than one thread. However, if many threads need to generate
pseudorandom numbers at a great rate, it may reduce contention for
each thread to have its own pseudorandom-number
Hi Lee,
Indeed -- from the docs for Math.random():
This method is properly synchronized to allow correct use by more
than one thread. However, if many threads need to generate
pseudorandom numbers at a great rate, it may reduce contention for
each thread to have its own
I would just pass the atom and move the @ inside the function...
But the non-atom is automatically dereferenced and sent to the
respective function when I use swap! So unless there's another
function to alter atoms, I'm going to have the dereferenced version
there no matter what, right?
On
Ah, right, this is the function called from swap!. So move the
listener stuff out of your swap function and into the function that
calls swap! instead?
On Thu, Mar 25, 2010 at 11:02 PM, Josh Stratton
strattonbra...@gmail.com wrote:
I would just pass the atom and move the @ inside the
I've been using clojure 1.1.0 (via MacPorts clojure+rlwrap) and every
time I type Control-C, it kills closure and dumps me back at my shell.
Is that what is supposed to happen?
Is there some other keystroke I should be using that will interrupt
clojure and put me back at the clojure
Look at clojure.contrib.repl-utils/add-break-thread!:
http://richhickey.github.com/clojure-contrib/repl-utils-api.html
-Per
On Fri, Mar 26, 2010 at 10:20 AM, Douglas Philips d...@mac.com wrote:
I've been using clojure 1.1.0 (via MacPorts clojure+rlwrap) and every time I
type Control-C, it
As others have pointed out using per-thread java.util.Random objects
is probably the best way to go in this particular case. However, I'm
curious if the following code could give any speed gain on your
machine:
(defn rand-seq [] (repeatedly #(. Math (random
(def rand-seq-ref (ref
One of the weirdest things coming to the Java world is to witness what
strange things people take for granted should be in the build tool.
All the example features you mention in your article are convenient,
but I don't see why they belong in the build tool. They should be
completely separate
On 2010 Mar 25, at 11:29 PM, Per Vognsen wrote:
Look at clojure.contrib.repl-utils/add-break-thread!:
http://richhickey.github.com/clojure-contrib/repl-utils-api.html
Nice. Now I have to figure out how to get a clojure rc file! :)
-Doug
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You received this message because you are
I was going to suggest something similar using seque in an atom, but
in neither case (using an atom or a ref) is the contention going to be
minimized -- just shifted from the AtomicLong in java.util.Random to
the now-app-level atom or ref.
- Chas
On Mar 26, 2010, at 12:30 AM, Andrzej
You can put a user.clj file in your class path.
-Per
On Fri, Mar 26, 2010 at 11:42 AM, Douglas Philips d...@mac.com wrote:
On 2010 Mar 25, at 11:29 PM, Per Vognsen wrote:
Look at clojure.contrib.repl-utils/add-break-thread!:
http://richhickey.github.com/clojure-contrib/repl-utils-api.html
Because they're common processes that are ideally built once, and then
reused with minor variation. Library reuse is generally considered to
be a good thing in software development, so it strikes me as odd that
many think that such practices should stop at the build's edge, as it
were.
On Fri, Mar 26, 2010 at 11:50 AM, Chas Emerick cemer...@snowtide.com wrote:
Because they're common processes that are ideally built once, and then
reused with minor variation. Library reuse is generally considered to be a
good thing in software development, so it strikes me as odd that many
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