date:20090115



On Jan 15, 2009, at 2:57 AM, bOR_ wrote:


That is, if I understand blocking correctly. Currently assuming that
blocking only happens when two things would like to write the same
ref?


Blocking in this case refers to this definition:

http://en.wikipedia.org/wiki/Blocking_(computing)

You should use send-off if any of the operations in the action may  
cause the the thread it runs in to block (sleep) while waiting for  
something. That something is often I/O completion, but a thread can  
also block waiting to acquire a lock, or waiting for a time interval  
to elapse.


If anything in the action requires waiting, use send-off, otherwise  
use send.


--Steve



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Re: 1 2 isn't working properly

2009-01-15 Thread HB


Do *1 *2 *3 ... are saved in a built in sequence that we can inspect
its contents?

On Jan 14, 2:20 pm, Martin Wood-Mitrovski marvot...@gmail.com wrote:
 On Wed, 14 Jan 2009 04:15:18 -0800 (PST)

 HB hubaghd...@gmail.com wrote:

  Lets say that the result of each method invocation will be saved in a
  stack.
  The stack now contains, Google and Wicket
  When I run (str *1) , I will get the last item in the stack which it
  is Wicket and the result of the method invocation iteself (which it
  is also Wicket) will be pushed into the stack.
  So the stack now contains:
  Google, Wicket, Wicket
  Am I right?

 sounds right to me.
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Re: Synchronization Benchmarks

2009-01-15 Thread Christophe Grand


stuhood a écrit :
 Hey gang,

 First time poster!

 I figured the best way to explore the interesting parts of Clojure
 (for me: STM, Java interop) would be to implement a simple locking
 problem in Java and Clojure, and pit them against eachother. The
 results are about what I expected, but I'm sure you all can tell me
 how I might make Clojure more competitive.

 http://github.com/stuhood/clojure-conc/tree/master

 The benchmark contains 4 bi-directional dictionary implementations:
  * MDict - Java implementation using the synchronized keyword,
  * RWDict - Java implementation using a ReadWriteLock,
  * CLJDict - Clojure implementation using the (locking x) macro on
 Java HashMaps,
  * STMDict - Clojure implementation using two refs on maps.
   

I'm pretty sure that STMDict doesn't need two refs on maps but one ref 
on two maps (which would allow you to use commute in lieu of alter)
 and since 'this is not hinted in STM-put, STM-getValue and STM-getKey I 
think you have a reflective call for each (.state this).

(defn STM-init []
  ; returns the state of a new STMDict: a ref to two HashMaps
  ; see gen-class docs
  [[] (ref [{} {}])])
  (defn- bidi-assoc [[ktov vtok] k v] [(assoc ktov k v) (assoc vtok v k) ])
(defn STM-put [#^com.mailtrust.dict.STMDict this key value]
(dosync
  (commute (.state this) bidi-assoc key value)))
 
(defn STM-getValue [#^com.mailtrust.dict.STMDict this key]
(get (first @(.state this)) key))
 
(defn STM-getKey [#^com.mailtrust.dict.STMDict this value]
(get (second @(.state this)) value))


(untested code)

Christophe

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Re: 1 2 isn't working properly


On Jan 15, 2009, at 7:28 AM, HB wrote:

Do *1 *2 *3 ... are saved in a built in sequence that we can inspect  
its contents?


No, they are separate vars. Here's the code from the core of the read- 
eval-print loop in clojure/src/clj/clojure/main.clj that shows how  
they're updated:


 (let [input (read)]
   (skip-if-eol *in*)
   (let [value (eval input)]
 (print value)
 (set! *3 *2)
 (set! *2 *1)
 (set! *1 value)))

As a group, *1, *2, and *3 form (effectively) a small queue (not a  
stack as someone mentioned previously). If at any point, you want to  
see all three together, you can evaluate an expression that puts them  
all in a vector:


Clojure
user= :a
:a
user= :b
:b
user= :c
:c
user= :d
:d
user= [*1 *2 *3]
[:d :c :b]

Note that evaluating the vector makes that the new most recent  
value: it causes a new *1 to be pushed into the queue:


user= [*1 *2 *3]
[[:d :c :b] :d :c]
user=

--Steve



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Re: 1 2 isn't working properly

2009-01-15 Thread HB


As a group, *1, *2, and *3 form (effectively) a small queue (not a  stack as 
someone mentioned previously).
It was me :)

On Jan 15, 3:00 pm, Stephen C. Gilardi squee...@mac.com wrote:
 On Jan 15, 2009, at 7:28 AM, HB wrote:

  Do *1 *2 *3 ... are saved in a built in sequence that we can inspect  
  its contents?

 No, they are separate vars. Here's the code from the core of the read-
 eval-print loop in clojure/src/clj/clojure/main.clj that shows how  
 they're updated:

               (let [input (read)]
                 (skip-if-eol *in*)
                 (let [value (eval input)]
                   (print value)
                   (set! *3 *2)
                   (set! *2 *1)
                   (set! *1 value)))

 As a group, *1, *2, and *3 form (effectively) a small queue (not a  
 stack as someone mentioned previously). If at any point, you want to  
 see all three together, you can evaluate an expression that puts them  
 all in a vector:

         Clojure
         user= :a
         :a
         user= :b
         :b
         user= :c
         :c
         user= :d
         :d
         user= [*1 *2 *3]
         [:d :c :b]

 Note that evaluating the vector makes that the new most recent  
 value: it causes a new *1 to be pushed into the queue:

         user= [*1 *2 *3]
         [[:d :c :b] :d :c]
         user=

 --Steve

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(newby) Quicksort in clojure

2009-01-15 Thread e


What would be a good way to implement quicksort in clojure (or any
persistent language)?  I mean, not just something that works or has
the right theoretical runtime.   I've thought about just looking to
see how sort was implemented in clojure, but I don't know if it would
get to my point once I found out -- for all I know heapsort is way
better in such pointer-machine-like environments (that's how I think
of it, at least).

So I know about the way Haskell intros do it:

*recursively concatenate the quicksort of everything less than a pivot
with the pivot, and append the quicksort of everything greater than
the pivot to the end of that.

That gets you the right answer, but it is pointed out (for example
here: 
http://augustss.blogspot.com/2007/08/quicksort-in-haskell-quicksort-is.html)
that the preferred, elegant, in place partition algorithm (that I
think I read Knuth came up with?) is noteworthy, starting from both
ends and walking toward the middle, swapping as you go.  I admire
Lennart Augustsson for doing that exercise -- whatever the controversy
surrounding it might be (did he show Haskell can be just as serious as
C, or did he defeat the point of high-level languages? . . . .etc,
etc.)

Now in clojure, I could just use var-set and var-get, like folks
helped me (on my stubbornness) to get going here, but what should I
do, short of * above?  One interesting answer I came up with was to
step back and say, HOLD IT.  This language was built with concurrency
in mind.  You don't make your money doing it the single threaded way.
just use C for that.

So I'm even considering (but not limiting the challenge to) parallel
approaches.  In such an environment it might be ok to do a little
extra work . . . maybe make some extra copies, etc., because of the
speedups.  Step one could start with one thread that spawns a thread
(agent here?) for each partition (those in turn doing the same thing)
and when those answers come back, the sort it done.

I may do the parallel route to understand the thread model, but is
there something simple, also, as to the best way to think about
quicksort in clojure?

I could see something like this adding to Tim's examples page.

Thanks.
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configurable bash script to launch Clojure available

I've checked in a bash script for launching Clojure to clojure-contrib/ 
launchers/bash/clj-env-dir.


It's configured using environment variables (one required and several  
optional). It sets up the CLASSPATH for the Clojure instance it  
launches based on the contents of a directory. This is a mechanism  
similar to Java's java.ext.dirs facility but implemented without using  
java.ext.dirs. I've tested this on Mac OS X Leopard and Ubuntu Intrepid.


Here's a description of the environment variables it uses:

# Environment variables:
#
# Required:
#
#  CLOJURE_EXT  The path to a directory containing (either directly or  
as

#   symbolic links) jar files and/or directories whose paths
#   should be included in CLASSPATH. These paths will be
#   prepended to any prior definition of the CLASSPATH
#   environment variable.
#
# Optional:
#
#  CLOJURE_JAVA The command to launch a JVM instance for Clojure
#   default: java
#   example: /usr/local/bin/java6
#
#  CLOJURE_OPTS Java options for this JVM instance
#   default:
#   example:-Xms32M -Xmx128M -server
#
#  CLOJURE_MAIN The Java class to launch
#   default: clojure.main
#   example: clojure.contrib.repl_ln

clj-env-dir can be used directly to launch Clojure or as a building  
block for creating launch scripts for a variety of purposes.


Here are two examples of using it as a building block: (these also use  
CLOJURE_CONTRIB whose value should be the path to an svn download  
directory for clojure-contrib)


clj (stock clojure.main call, can launch a repl, script, or just  
eval based on arguments to clj)


#!/bin/bash

export CLOJURE_MAIN=clojure.main
CLJ=$CLOJURE_CONTRIB/launchers/bash/clj-env-dir
OPTS=

exec $CLJ $OPTS $@

cljr (repl using clojure.contrib.repl_ln)

#!/bin/bash

export CLOJURE_MAIN=clojure.contrib.repl_ln
CLJ=$CLOJURE_CONTRIB/launchers/bash/clj-env-dir
OPTS=--init @repl_init.clj --repl

exec $CLJ $OPTS $@

--Steve



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Re: question about understanding/exploring agents

2009-01-15 Thread bOR_


I think I know when to use one and when to use the other, but the
extra clarification doesn't hurt. However, what happens if you get it
wrong? use send where you should have used send-off, and visa versa? I
would like to know what they do differently.

On 15 jan, 13:12, Stephen C. Gilardi squee...@mac.com wrote:
 On Jan 15, 2009, at 2:57 AM, bOR_ wrote:

  That is, if I understand blocking correctly. Currently assuming that
  blocking only happens when two things would like to write the same
  ref?

 Blocking in this case refers to this definition:

 http://en.wikipedia.org/wiki/Blocking_(computing)

 You should use send-off if any of the operations in the action may  
 cause the the thread it runs in to block (sleep) while waiting for  
 something. That something is often I/O completion, but a thread can  
 also block waiting to acquire a lock, or waiting for a time interval  
 to elapse.

 If anything in the action requires waiting, use send-off, otherwise  
 use send.

 --Steve

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newbie destructuring question

2009-01-15 Thread wubbie


came across over the net the following examples.
I can understand full destructuring because [ and ]
mirrors the structure of tree.
But in partial desctructuring, [[a [b]] has extra pair of outer-most
[] which leads to confusion. Any explanation on that?
Also not sure about the last (on strings).

Thanks in advance
sun



(def flat flat)
(def tree '((one (two)) three (((four)

;; Simple binding (like Common Lisp's LET*).
(let [var1 flat
  var2 tree]
  (list var1 var2))

- (flat ((one (two)) three (((four)

;; Full destructuring.
(let [var1 flat
  [[a [b]] c [[[d tree]
  (list var1 a b c d))

- (flat one two three four)

;; Partial destructuring.
(let [[[a [b]]  leftover :as all] tree]
  (list a b leftover all))

- (one two (three (((four
((one (two)) three (((four)

;; Works on strings, too.
(let [[a b c  leftover] 123go]
  (list a b c leftover))

- (\1 \2 \3 (\g \o))





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Re: question about understanding/exploring agents



On Jan 15, 2009, at 9:26 AM, bOR_ wrote:


I think I know when to use one and when to use the other, but the
extra clarification doesn't hurt. However, what happens if you get it
wrong? use send where you should have used send-off, and visa versa? I
would like to know what they do differently.


There are two pools of threads servicing agent actions. The send pool  
is fixed in size and based on the number of available cores. The send- 
off pool is variable in size and grows as needed to accommodate the  
largest number of simultaneous pending send-off calls that your  
program produces.


If you use send-off when you could have used send, your send-off  
thread pool may grow larger than it needed to grow.


If you use send when you should have used send-off, other actions sent  
to other agents may be delayed. Where the expected to run very soon,  
they may now have to wait behind a blocking operation which could  
easily increase the wait time from tens of microseconds or less to  
tens of milliseconds or more--a huge factor.


--Steve



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Re: No Indentation in SLIME

2009-01-15 Thread Vincent Foley


By default Return is bound to the command newline which does not
indent.  If you press the Tab key, you'll be placed at the correct
indentation spot.  To make this automatic, you need to rebind Return
to newline-and-indent:

(global-set-key (kbd C-m) 'newline-and-indent)

Hope this helps.

Vincent

On Jan 15, 2:27 am, Kyle Smith mr.kyle.sm...@gmail.com wrote:
 Hello,

 I'm new to Clojure, SLIME, and emacs in general but I've noticed my
 SLIME REPL does not indent properly when I use return or C-j. This
 is the error message I see:

 calculate-lisp-indent: Symbol's function definition is void: clojure-
 indent-function

 I've experienced this when setting up Clojure + SLIME via .emacs and
 also when running Clojure Box. When I open a .clj file indentation
 works just fine. I just have trouble with the SLIME REPL.

 One thing I noticed is if I evaluate the function clojure-indent-
 function, function clojure-backtracking-indent, and custom clojure-
 mode-use-backtracking-indent (from clojure-mode.el) within the
 *scratch* buffer my SLIME REPL will indent correctly.

 I've seen a few posts with similar problems but I haven't found a
 solution that works.

 Thanks,
 Kyle
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Re: Accessing this in gen-class constructor


On Tue, Dec 30, 2008 at 1:24 PM, CuppoJava patrickli_2...@hotmail.com wrote:

 Haha yeah... it's a rather poor API.

 I'm making do with a temporary post-constructor hook that I manually
 call after instantiating the object right now. But it's tedious and
 error-prone.

I've posted a feature request:
http://code.google.com/p/clojure/issues/detail?id=45

Now you can submit your CA, submit a patch, and nobody will ever have
to suffer your pain again. :-)

--Chouser

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Re: command-line in clojure.contrib suggestions


On Mon, Jan 12, 2009 at 10:58 PM, aria42 ari...@gmail.com wrote:

 Couldn't it have access to the other bindings so far like let? And
 then just have the order of options reflect the partial order induced
 by dependency? So is this possible...

 (with-command-line *command-line-args*
  my-program
  [[size The size of something #(if % (Integer/parseInt %) 99)]
   [picture Path to Picture #(load-picture % size)]]
  (do-stuff-with-picture))

I guess I'm not convinced it's good to have code mixed in with the
command-line specs like that.  Can you show me your real-world
example?

 Also, other suggestions might be being able to declare an option or
 conditional dependencies. Ideally we could have lots
 of optional keyword arguments :default, :required, :depends, etc...

 This is probably more heavy than most people use, but I would
 definitely find it useful.

There are certainly plenty of features that could be added, and I'm
not at all opposed to that.  But every feature added to the API will
be painful to change later as it might break people's code, so I'd
like to add features slowly and carefully.

Thanks for the ideas.

--Chouser

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Re: No Indentation in SLIME

2009-01-15 Thread Bill Clementson


Hi Kyle,

On Wed, Jan 14, 2009 at 11:27 PM, Kyle Smith mr.kyle.sm...@gmail.com wrote:
 I'm new to Clojure, SLIME, and emacs in general but I've noticed my
 SLIME REPL does not indent properly when I use return or C-j. This
 is the error message I see:

 calculate-lisp-indent: Symbol's function definition is void: clojure-
 indent-function

 I've experienced this when setting up Clojure + SLIME via .emacs and
 also when running Clojure Box. When I open a .clj file indentation
 works just fine. I just have trouble with the SLIME REPL.

 One thing I noticed is if I evaluate the function clojure-indent-
 function, function clojure-backtracking-indent, and custom clojure-
 mode-use-backtracking-indent (from clojure-mode.el) within the
 *scratch* buffer my SLIME REPL will indent correctly.

 I've seen a few posts with similar problems but I haven't found a
 solution that works.

The function clojure-indent-function is defined in clojure-mode.el
but clojure-mode.el is only loaded when a Clojure source file is
opened. Therefore, if for example you opened a Clojure source file and
then started the slime repl, you would not have the problem. However,
you don't want to always open a Clojure source file before you start a
repl, so to fix this, make certain that clojure-mode.el is started
before you start the repl. This can be done in a number of ways -
adding the following to your .emacs startup code is probably the
easiest:

(add-hook 'slime-connected-hook (lambda ()
  (require 'clojure-mode)))

--
Bill Clementson

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Re: configurable bash script to launch Clojure available


On Thu, Jan 15, 2009 at 8:58 AM, Stephen C. Gilardi squee...@mac.com wrote:
 I've checked in a bash script for launching Clojure to
 clojure-contrib/launchers/bash/clj-env-dir.

I had a launch script (which I've now lost due to my own clumsiness)
that defaulted to a repl if given no file options, and always loaded a
.clojurerc.clj file before starting a repl (whether it was by default
or specifically asked via -r).  This allowed me to load repl-utils and
get *print-length* set up before getting a prompt.  But if a file was
named with now -r, it was run with no repl.  It used appropriate
combinations of clojure.lang.Repl or clojure.lang.Script and file
paths to make this happen.

As far as I can tell this is impossible with clojure.main, which
appears to only allow loading a file *or* starting a repl.  Am I
missing a method to support this, or should I go back to using
Script/Repl?

My script also accepted a -cp argument to augment any automatic or
default classpath it set up.  I found this useful when tracking down
gen-class issues, but I never had this nice symlink-dir setup, which
might very well be better.

I apologize for not speaking up earlier in clojure.main's development,
when such issues probably could have been addressed more easily.

--Chouser

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Re: command-line in clojure.contrib suggestions


On Thu, Jan 15, 2009 at 11:10 AM, Matt Revelle mreve...@gmail.com wrote:

 Perhaps for built-in types, the command-line spec should support
 defining the destination type and handle the conversion from string.

That's an interesting idea.  It would allow the automatic help text to
be more specific as well.

--Chouser

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Re: test-is: set! *e


Hi Allen,

Good idea.  But instead of setting *e I've modified report to print
a brief stack trace for every error.  See if that works.

-Stuart Sierra

On Jan 14, 11:30 pm, Allen Rohner aroh...@gmail.com wrote:
 Here's a trivial patch that I've found useful. After catching an
 uncaught exception in a test, set! *e so you can examine the stack
 trace afterward.

 ===
 --- src/clojure/contrib/test_is.clj     (revision 314)
 +++ src/clojure/contrib/test_is.clj     (working copy)

 @@ -233,7 +289,8 @@
          (try (t)
               (catch Throwable e
                 (report :error Uncaught exception, not in assertion.
 -                       nil e))
 +                       nil e)
 +              (set! *e e))
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Re: configurable bash script to launch Clojure available

2009-01-15 Thread Konrad Hinsen


On Jan 15, 2009, at 17:31, Chouser wrote:

 I had a launch script (which I've now lost due to my own clumsiness)
 that defaulted to a repl if given no file options, and always loaded a
 .clojurerc.clj file before starting a repl (whether it was by default
 or specifically asked via -r).  This allowed me to load repl-utils and
 get *print-length* set up before getting a prompt.  But if a file was
 named with now -r, it was run with no repl.  It used appropriate
 combinations of clojure.lang.Repl or clojure.lang.Script and file
 paths to make this happen.

 As far as I can tell this is impossible with clojure.main, which
 appears to only allow loading a file *or* starting a repl.  Am I
 missing a method to support this, or should I go back to using
 Script/Repl?

If I understand correctly what you are looking for, it exists. Here  
is my standard command line for starting Clojure:

java  -cp $HOME/.clojure/clojure.jar:$HOME/.clojure/clojure- 
contrib.jar clojure.main -i $HOME/.clojure/repl-init.clj -r

This first executes repl-init.clj (from where I load repl-utils, set  
*print-length* etc.) and then starts the repl.

Konrad.


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Re: configurable bash script to launch Clojure available

2009-01-15 Thread Mark Volkmann


I think a script like this should be included with the Clojure
download. It's seems to me that everyone needs one and currently has
to write their own by copying example script code from the Getting
Started page. Maybe we can't reach a concensus on everything the
script should do, but providing a good, basic starting point would be
useful. The basic features I would want include:

1) If I run clj, it starts a REPL.
2) If I run clj file-path, it runs that file as a Clojure script.
3) Some way to modify the classpath used by the script without
modifying the script.

On Thu, Jan 15, 2009 at 7:58 AM, Stephen C. Gilardi squee...@mac.com wrote:
 I've checked in a bash script for launching Clojure to
 clojure-contrib/launchers/bash/clj-env-dir.

 It's configured using environment variables (one required and several
 optional). It sets up the CLASSPATH for the Clojure instance it launches
 based on the contents of a directory. This is a mechanism similar to Java's
 java.ext.dirs facility but implemented without using java.ext.dirs. I've
 tested this on Mac OS X Leopard and Ubuntu Intrepid.

 Here's a description of the environment variables it uses:

 # Environment variables:
 #
 # Required:
 #
 #  CLOJURE_EXT  The path to a directory containing (either directly or as
 #   symbolic links) jar files and/or directories whose paths
 #   should be included in CLASSPATH. These paths will be
 #   prepended to any prior definition of the CLASSPATH
 #   environment variable.
 #
 # Optional:
 #
 #  CLOJURE_JAVA The command to launch a JVM instance for Clojure
 #   default: java
 #   example: /usr/local/bin/java6
 #
 #  CLOJURE_OPTS Java options for this JVM instance
 #   default:
 #   example:-Xms32M -Xmx128M -server
 #
 #  CLOJURE_MAIN The Java class to launch
 #   default: clojure.main
 #   example: clojure.contrib.repl_ln

 clj-env-dir can be used directly to launch Clojure or as a building block
 for creating launch scripts for a variety of purposes.

 Here are two examples of using it as a building block: (these also use
 CLOJURE_CONTRIB whose value should be the path to an svn download directory
 for clojure-contrib)

 clj (stock clojure.main call, can launch a repl, script, or just eval
 based on arguments to clj)

#!/bin/bash

export CLOJURE_MAIN=clojure.main
CLJ=$CLOJURE_CONTRIB/launchers/bash/clj-env-dir
OPTS=

exec $CLJ $OPTS $@

 cljr (repl using clojure.contrib.repl_ln)

#!/bin/bash

export CLOJURE_MAIN=clojure.contrib.repl_ln
CLJ=$CLOJURE_CONTRIB/launchers/bash/clj-env-dir
OPTS=--init @repl_init.clj --repl

exec $CLJ $OPTS $@

 --Steve





-- 
R. Mark Volkmann
Object Computing, Inc.

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Re: configurable bash script to launch Clojure available


On Thu, Jan 15, 2009 at 11:45 AM, Konrad Hinsen
konrad.hin...@laposte.net wrote:

 If I understand correctly what you are looking for, it exists. Here
 is my standard command line for starting Clojure:

 java  -cp $HOME/.clojure/clojure.jar:$HOME/.clojure/clojure-
 contrib.jar clojure.main -i $HOME/.clojure/repl-init.clj -r

 This first executes repl-init.clj (from where I load repl-utils, set
 *print-length* etc.) and then starts the repl.

You're absolutely right, that works just fine.  In fact, it's
essentially what I already have.

But it wasn't working for me, because in my startup .clj I had (left
over from my old script):

(when (= (System/getProperty repl) yes)
  (set! *print-length* 103)
  (use 'clojure.contrib.repl-utils))

Maybe I should always start a repl.  Why did I think I sometimes
wanted no repl? :-)

Anyway, thanks for the example.
--Chouser

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Re: configurable bash script to launch Clojure available



On Jan 15, 2009, at 11:31 AM, Chouser wrote:


I had a launch script (which I've now lost due to my own clumsiness)
that defaulted to a repl if given no file options, and always loaded a
.clojurerc.clj file before starting a repl (whether it was by default
or specifically asked via -r).  This allowed me to load repl-utils and
get *print-length* set up before getting a prompt.  But if a file was
named with [no] -r, it was run with no repl.  It used appropriate
combinations of clojure.lang.Repl or clojure.lang.Script and file
paths to make this happen.

As far as I can tell this is impossible with clojure.main, which
appears to only allow loading a file *or* starting a repl.  Am I
missing a method to support this, or should I go back to using
Script/Repl?


Given the clj script I posted earlier (which uses clojure.main  
directly) all of the following are possible. I think one of these  
covers the case you're asking about. If not, please let me know.


Launch a repl with no command-line-arguments:

clj

Run a script:

clj my-script

Run a script with command line args:

clj my-script 1 2 3

Load an init file from classpath then run a repl:

clj --init @my-init.clj --repl

Load an init file from classpath then run a repl with command line args:

clj --init @my-init.clj --repl 1 2 3

Load an init file from classpath and run a script with command line  
args:


clj --init @my-init.clj my-script 1 2 3

Load two init files and run a repl with command line args:

clj --init @my-init.clj --init my-script --repl 1 2 3

I recognize that having this documented at http://clojure.org/repl_and_main 
 will be very helpful to everyone. I'm working on that and I'll  
upload it before the end of this weekend.


--Steve



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Re: Only 9 agent send-offs complete?

2009-01-15 Thread Justin Johnson

I found my problem.  There were some issues with the underlying Subversion
actions happening at the same time.  I wasn't catching those errors though
because I wasn't looking at agent-errors.

I have it working correctly now with an agent per project (since a series of
updates for the project is the task), with the call to (apply await agents),
and ending with (shutdown-agents).

Thanks for your response.

Justin

On Wed, Jan 14, 2009 at 5:47 PM, Timothy Pratley
timothyprat...@gmail.comwrote:


 Your omission of (apply await agents) is allowing the program to
 terminate before all your created threads finish I think.
 If I might further comment, your threading model is not quite right to
 me...
 You've created 5 agents and then used them to 'send-off' as many
 threads as there are projects.
 I would recommend instead using an agent to represent each task and
 using send to take advantage of the thread pool so you don't need to
 worry about how many threads there are.
 


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Re: (newby) Quicksort in clojure

2009-01-15 Thread James Reeves


On Jan 15, 1:37 pm, e evier...@gmail.com wrote:
 What would be a good way to implement quicksort in clojure (or any
 persistent language)?

Lennart Augustsson's point is that destructive updates are part of the
Quicksort algorithm. If we accept that, then you'd want to use a plain
old java array in your algorithm.

Personally, I'd be inclined to use mergesort in a functional
programming language. It's easier to implement, easier to parallize
and better with linked lists.

- James
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Re: configurable bash script to launch Clojure available

2009-01-15 Thread Phil Hagelberg


Mark Volkmann r.mark.volkm...@gmail.com writes:

 I think a script like this should be included with the Clojure
 download. It's seems to me that everyone needs one and currently has
 to write their own by copying example script code from the Getting
 Started page.

Strongly agree. If 1.0 is released without this it would be a shame.

-Phil

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Re: How to reduce a list of booleans?



On Jan 15, 2009, at 1:53 PM, Daniel Jomphe wrote:

What would you consider the normal way of solving this small problem  
of mine?


(reduce #(and %1 %2) [true false true])

--Steve



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Re: Bug in .hashCode for vectors/lists (Old subject: Bugs in contains? (?))


Er, oops, forgot you can't HTML here.

Anyway, the upshot is that now

user= (import '(java.util ArrayList))
nil
(doseq [s ['(1 2) (seq '(1 2)) [1 2] (seq [1 2]) (ArrayList. [1
2])]]
  (print \n (.hashCode s))
  (doseq [t ['(1 2) (seq '(1 2)) [1 2] (seq [1 2]) (ArrayList. [1
2])]]
(print \t (.equals s t

 994 truetruetruetruetrue
 994 truetruetruetruetrue
 994 truetruetruetruetrue
 994 truetruetruetruetrue
 994 truetruetruetruetrue

and

user=  (map #(contains? (hash-set [1 2]) %) '((1 2) [1 2]))
(true true)

Woohoo, thanks Rich!

-Jason
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Re: How to reduce a list of booleans?

2009-01-15 Thread Christophe Grand


Daniel Jomphe a écrit :
 I'm in the following situation:

(and '(true true))
;doesn't work

   
(every? identity [true false true])

Christophe

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How to reduce a list of booleans?

2009-01-15 Thread Daniel Jomphe


I'm in the following situation:

   (and '(true true))
   ;doesn't work

I tried apply, reduce, and a few other things. Reading the apidocs,
reduce is said to be the proper choice to compute a boolean from a
seq. But:

   (reduce and '(true true))
   ;Exception: Can't take value of a macro: #'clojure.core/and

Also, the following isn't the solution:

   (reduce 'and '(true false true))
   ;true

In any case, I think using reduce with and wouldn't be nice because
it won't return false as soon as it can like and does. Therefore, I
came up with the following working solution:

   (defmacro and-booleans [logical-booleans-list]
 `(and ~...@logical-booleans-list))

   (and-booleans (true false true))
   ;false

But I wonder if I have overlooked something fundamental, either about
reduce or anything else.

Of course, I could have built my final boolean value imperatively, in
effect reimplementing and for lists as a function that wraps the
ant built-in macro. But I'm hoping to leave imperative programming
as much behing me as possible.

What would you consider the normal way of solving this small problem
of mine?
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Re: How to reduce a list of booleans?

2009-01-15 Thread wwmorgan


Look at every?. The predicate true? returns true if its argument is
the boolean literal true, and false otherwise. If, instead, you want
to check for logical truth (false and nil are false, everything else
is true), then use identity. As you can see, every? falls out at the
first false result.

user= (every? true? (list true true true))
true
user= (every? true? (lazy-cat [true false] (println not executed)))
false
user= (every? true? (lazy-cat [true true] (println executed)))
executed
true
user= (every? true? [])
true
user= (every? true? (list true 1))
false
user= (every? identity (list true 1))
true

On Jan 15, 1:53 pm, Daniel Jomphe danieljom...@gmail.com wrote:
 I'm in the following situation:

    (and '(true true))
    ;doesn't work

 I tried apply, reduce, and a few other things. Reading the apidocs,
 reduce is said to be the proper choice to compute a boolean from a
 seq. But:

    (reduce and '(true true))
    ;Exception: Can't take value of a macro: #'clojure.core/and

 Also, the following isn't the solution:

    (reduce 'and '(true false true))
    ;true

 In any case, I think using reduce with and wouldn't be nice because
 it won't return false as soon as it can like and does. Therefore, I
 came up with the following working solution:

    (defmacro and-booleans [logical-booleans-list]
      `(and ~...@logical-booleans-list))

    (and-booleans (true false true))
    ;false

 But I wonder if I have overlooked something fundamental, either about
 reduce or anything else.

 Of course, I could have built my final boolean value imperatively, in
 effect reimplementing and for lists as a function that wraps the
 ant built-in macro. But I'm hoping to leave imperative programming
 as much behing me as possible.

 What would you consider the normal way of solving this small problem
 of mine?
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Re: How to reduce a list of booleans?

2009-01-15 Thread Daniel Jomphe


 (every? identity [true false true])

So obvious, yet so overlooked each time I read the function names in
the api!

Thanks to both you! Looks like I'll be having a bunch of fun through
this learning curve in the future. :)
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Problem using fn macro

2009-01-15 Thread Hugh Winkler


I just encountered a surprise attempting to return a function from a
function. In the below case, if the function parameter is named fn,
then calling the function throws an exception. If the function
parameter is named f, no problem. (Using svn as of yesterday)

(defn no-problem[f]
  (fn [] (apply f [])))
(no-problem #(prn 99))  ;; returns a function as expected

(defn problem[fn]
  (fn [] (apply fn [])));; same code as above but renamed
function parameter to fn

(problem #(prn 99)) ;; prints out 99 and throws an exception :


java.lang.IllegalArgumentException: Wrong number of args passed to:
dispatch$eval--3402$fn (NO_SOURCE_FILE:0)
 [Thrown class clojure.lang.Compiler$CompilerException]

Restarts:
 0: [ABORT] Return to SLIME's top level.
 1: [CAUSE] Throw cause of this exception

Backtrace:
 0: clojure.lang.Compiler.eval(Compiler.java:4179)
 1: clojure.core$eval__3733.invoke(core.clj:1582)
 --more--

Regards,

Hugh

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Re: newbie destructuring question

2009-01-15 Thread James Reeves


On Jan 15, 2:54 pm, wubbie sunj...@gmail.com wrote:
 But in partial desctructuring, [[a [b]] has extra pair of outer-most
 [] which leads to confusion. Any explanation on that?

Extra pair of []? What do you mean?

The destructuring pattern is: [[a [b]]  leftover]
The pattern you're matching is: ((one (two)) three (((four

So:
a = one
b = two
leftover = '(three (((four

All seems pretty correct to me. Is it just the  that's confusing?

 Also not sure about the last (on strings).

Well, if you turn a string into a sequence, you get a sequence of
chars. \a is a char, so (seq abc) is (\a \b \c).

The destructuring pattern is: [a b c  leftover]
The pattern you're matching is: (\1 \2 \3 \g \o)

So: a = 1, b = 2, c = 3 and leftover = (\g \o)

Does that make things any clearer, or have I just confused you
further? :)

- James
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Re: newbie destructuring question

2009-01-15 Thread wubbie


 Extra pair of []? What do you mean?

Sorry, my bad.

-sun

On Jan 15, 1:25 pm, James Reeves weavejes...@googlemail.com wrote:
 On Jan 15, 2:54 pm, wubbie sunj...@gmail.com wrote:

  But in partial desctructuring, [[a [b]] has extra pair of outer-most
  [] which leads to confusion. Any explanation on that?

 Extra pair of []? What do you mean?

 The destructuring pattern is: [[a [b]]  leftover]
 The pattern you're matching is: ((one (two)) three (((four

 So:
 a = one
 b = two
 leftover = '(three (((four

 All seems pretty correct to me. Is it just the  that's confusing?

  Also not sure about the last (on strings).

 Well, if you turn a string into a sequence, you get a sequence of
 chars. \a is a char, so (seq abc) is (\a \b \c).

 The destructuring pattern is: [a b c  leftover]
 The pattern you're matching is: (\1 \2 \3 \g \o)

 So: a = 1, b = 2, c = 3 and leftover = (\g \o)

 Does that make things any clearer, or have I just confused you
 further? :)

 - James
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Re: Problem using fn macro

2009-01-15 Thread Vincent Foley


When you're using fn as a parameter name, you are shadowing the fn
special form.  Like Mark Volkmann said, it is best that you refrain
from using special form names and core macros and functions names to
name your own things.  f is the prefered notation to name a function
passed to another function.

Be safe,

Vince.

On Jan 15, 2:12 pm, Hugh Winkler hwink...@gmail.com wrote:
 I just encountered a surprise attempting to return a function from a
 function. In the below case, if the function parameter is named fn,
 then calling the function throws an exception. If the function
 parameter is named f, no problem. (Using svn as of yesterday)

 (defn no-problem[f]
   (fn [] (apply f [])))
 (no-problem #(prn 99))  ;; returns a function as expected

 (defn problem[fn]
   (fn [] (apply fn [])))    ;; same code as above but renamed
 function parameter to fn

 (problem #(prn 99)) ;; prints out 99 and throws an exception :

 java.lang.IllegalArgumentException: Wrong number of args passed to:
 dispatch$eval--3402$fn (NO_SOURCE_FILE:0)
  [Thrown class clojure.lang.Compiler$CompilerException]

 Restarts:
  0: [ABORT] Return to SLIME's top level.
  1: [CAUSE] Throw cause of this exception

 Backtrace:
  0: clojure.lang.Compiler.eval(Compiler.java:4179)
  1: clojure.core$eval__3733.invoke(core.clj:1582)
  --more--

 Regards,

 Hugh
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Re: Problem using fn macro

2009-01-15 Thread redc...@gmail.com


by having a parameter named fn you are shadowing the global fn
so what is happening is the (fn ...) form inside the function is
trying to apply the function you passed in to the arguments. the
function
you passed in takes no arguments so you get the  Wrong number of args
passed to
exception.

On Jan 15, 11:12 am, Hugh Winkler hwink...@gmail.com wrote:
 I just encountered a surprise attempting to return a function from a
 function. In the below case, if the function parameter is named fn,
 then calling the function throws an exception. If the function
 parameter is named f, no problem. (Using svn as of yesterday)

 (defn no-problem[f]
   (fn [] (apply f [])))
 (no-problem #(prn 99))  ;; returns a function as expected

 (defn problem[fn]
   (fn [] (apply fn [])))    ;; same code as above but renamed
 function parameter to fn

 (problem #(prn 99)) ;; prints out 99 and throws an exception :

 java.lang.IllegalArgumentException: Wrong number of args passed to:
 dispatch$eval--3402$fn (NO_SOURCE_FILE:0)
  [Thrown class clojure.lang.Compiler$CompilerException]

 Restarts:
  0: [ABORT] Return to SLIME's top level.
  1: [CAUSE] Throw cause of this exception

 Backtrace:
  0: clojure.lang.Compiler.eval(Compiler.java:4179)
  1: clojure.core$eval__3733.invoke(core.clj:1582)
  --more--

 Regards,

 Hugh
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Re: when performance matters

2009-01-15 Thread Mark H.


On Jan 15, 12:09 am, bOR_ boris.sch...@gmail.com wrote:
 I remember from 5 years ago that a collegue of mine improved a
 diffusion algorithm for a successor of me by some heavy algorithms. My
 own algorithm was a simple loop-over-the- array once, dump-a-fraction-
 of-each-cell-into-spatially-neighbouring-cells-in-the-new-array, and
 sum what is in every cell of the new array (you are doing the same
 thing, right?). However, there are far faster algorithms.

 If you are interested, I'll inquire.

It's just idle curiosity on my part but Asbjørn may very well be
interested ;-)

Dump a fraction of each cell into spatially neighbouring cells in the
new array is a stationary iterative method, probably Jacobi iteration
(since there is a new array -- Asbjørn is recycling the old array
so he is doing Gauss-Seidel iteration).  Gauss-Seidel often converges
a bit faster but the heavy algorithms (FFT, multigrid,
preconditioned iterative solvers) converge much faster.  However there
is a higher setup cost with some of these and for the application it's
not clear whether an accurate solve is needed.

mfh
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Re: Synchronization Benchmarks

2009-01-15 Thread Mark H.


Welcome to the group! :-)

On Jan 15, 1:38 am, stuhood stuh...@gmail.com wrote:
 The benchmark contains 4 bi-directional dictionary implementations:
  * MDict - Java implementation using the synchronized keyword,
  * RWDict - Java implementation using a ReadWriteLock,
  * CLJDict - Clojure implementation using the (locking x) macro on
 Java HashMaps,
  * STMDict - Clojure implementation using two refs on maps.

Doesn't Java already have a more optimized thread-safe hash table that
works by locking individual buckets, rather than the whole table?
Maybe I'm just confused ;-P

mfh
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Re: Synchronization Benchmarks

2009-01-15 Thread Christian Vest Hansen


On Thu, Jan 15, 2009 at 8:35 PM, Mark H. mark.hoem...@gmail.com wrote:

 Welcome to the group! :-)

 On Jan 15, 1:38 am, stuhood stuh...@gmail.com wrote:
 The benchmark contains 4 bi-directional dictionary implementations:
  * MDict - Java implementation using the synchronized keyword,
  * RWDict - Java implementation using a ReadWriteLock,
  * CLJDict - Clojure implementation using the (locking x) macro on
 Java HashMaps,
  * STMDict - Clojure implementation using two refs on maps.

 Doesn't Java already have a more optimized thread-safe hash table that
 works by locking individual buckets, rather than the whole table?
 Maybe I'm just confused ;-P

It does: 
http://java.sun.com/javase/6/docs/api/java/util/concurrent/ConcurrentHashMap.html

Alternative implementations of concurrency-aware HashMaps also exists
out on the 'nets (NBHashMap by Cliff Click and FashHashMap in
Javolution).


 mfh
 




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Re: Synchronization Benchmarks

2009-01-15 Thread Christian Vest Hansen


On Thu, Jan 15, 2009 at 8:47 PM, Christian Vest Hansen
karmazi...@gmail.com wrote:
 On Thu, Jan 15, 2009 at 8:35 PM, Mark H. mark.hoem...@gmail.com wrote:
 On Jan 15, 1:38 am, stuhood stuh...@gmail.com wrote:
 The benchmark contains 4 bi-directional dictionary implementations:
...

 Doesn't Java already have a more optimized thread-safe hash table that
 works by locking individual buckets, rather than the whole table?
 Maybe I'm just confused ;-P

Ah! but a mere hash table is not bi-directional :-)


-- 
Venlig hilsen / Kind regards,
Christian Vest Hansen.

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Re: Problem using fn macro

2009-01-15 Thread Hugh Winkler


OK, thanks all, got it.

Hugh


On Thu, Jan 15, 2009 at 1:33 PM, redc...@gmail.com redc...@gmail.com wrote:

 by having a parameter named fn you are shadowing the global fn
 so what is happening is the (fn ...) form inside the function is
 trying to apply the function you passed in to the arguments. the
 function
 you passed in takes no arguments so you get the  Wrong number of args
 passed to
 exception.

 On Jan 15, 11:12 am, Hugh Winkler hwink...@gmail.com wrote:
 I just encountered a surprise attempting to return a function from a
 function. In the below case, if the function parameter is named fn,
 then calling the function throws an exception. If the function
 parameter is named f, no problem. (Using svn as of yesterday)

 (defn no-problem[f]
   (fn [] (apply f [])))
 (no-problem #(prn 99))  ;; returns a function as expected

 (defn problem[fn]
   (fn [] (apply fn [])));; same code as above but renamed
 function parameter to fn

 (problem #(prn 99)) ;; prints out 99 and throws an exception :

 java.lang.IllegalArgumentException: Wrong number of args passed to:
 dispatch$eval--3402$fn (NO_SOURCE_FILE:0)
  [Thrown class clojure.lang.Compiler$CompilerException]

 Restarts:
  0: [ABORT] Return to SLIME's top level.
  1: [CAUSE] Throw cause of this exception

 Backtrace:
  0: clojure.lang.Compiler.eval(Compiler.java:4179)
  1: clojure.core$eval__3733.invoke(core.clj:1582)
  --more--

 Regards,

 Hugh
 


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Re: Clojure Box, alpha

2009-01-15 Thread bOR_


Sort of got distracted and stopped paying attention to getting that to
run. I'll report when I get to it and learn more :).

On Jan 5, 11:43 pm, Shawn Hoover shawn.hoo...@gmail.com wrote:
 On Mon, Jan 5, 2009 at 4:24 PM, bOR_ boris.sch...@gmail.com wrote:

  Just downloaded clojurebox and it installs like a charm here (windows
  vista business). It looks like I am stuck with windows at my new
  workspace (just had my first day of work there), so to have clojurebox
  was a nice thing. One question is how I would go about to setting up a
  emacs --daemon and emacsclient combination in clojurebox? Being able
  to detach and quit the emacs client and later on connect back to it
  saves me from accidentally stopping a long simulation in windows
  because I quitted the emacs program.

  Currently if I try to C-x #, I get the message No server editing
  buffers exist

 The emacs that you start with the Clojure Box icon becomes a server, but it
 has no clients waiting on it. If you later run c:\Program Files\Clojure
 Box\emacs\emacs\bin\emacsclient.exe from the command line or as an editor
 for a program like subversion, the file to edit will pop up in the Clojure
 Box and you can use C-x #. Does that help?

 Shawn
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Re: How to reduce a list of booleans?


On Jan 15, 2:05 pm, Daniel Jomphe danieljom...@gmail.com wrote:
  (every? identity [true false true])

 So obvious, yet so overlooked each time I read the function names in
 the api!

Hi Daniel,

FYI, the reason and doesn't work is that it's a macro, not a
function.  Only functions can be used with apply.

If you had a hypothetical and function like this:

(defn and-fn [ args] (every? identity args))

Then you could use apply:

(apply and-fn [true true])
;= true
(apply and-fn [true false true])
;= false

But, obviously, just using every? in the first place is a lot
simpler.
-Stuart Sierra

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Two errors building closure

2009-01-15 Thread Ron Parker


I am trying to build Clojure on Fedora 10. When I first run ant, I get
a message about the compliance level 1.4 not supporting target version
1.5.  So I add source=1.5 to the javac task.  Then I get a lot of
warnings and the following 3 errors.

[javac] 354. ERROR in /home/rdp/lisp/clj/clojure/src/jvm/clojure/
lang/Numbers.java (at line 900)
[javac] : toBigDecimal(x).divide(toBigDecimal(y), mc);
[javac]   ^^
[javac] The method divide(BigDecimal, int) in the type BigDecimal
is not applicable for the arguments (BigDecimal, MathCont
ext)
[javac] --
[javac] 355. ERROR in /home/rdp/lisp/clj/clojure/src/jvm/clojure/
lang/Numbers.java
[javac]  (at line 907)
[javac] : toBigDecimal(x).divideToIntegralValue(toBigDecimal
(y), mc);
[javac]   ^
[javac] The method divideToIntegralValue(BigDecimal) in the type
BigDecimal is not applicable for the arguments (BigDecimal
, MathContext)
[javac] --
[javac] 356. ERROR in /home/rdp/lisp/clj/clojure/src/jvm/clojure/
lang/Numbers.java (at line 914)
[javac] : toBigDecimal(x).remainder(toBigDecimal(y), mc);
[javac]   ^
[javac] The method remainder(BigDecimal) in the type BigDecimal is
not applicable for the arguments (BigDecimal, MathContex
t)

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test-is reporting problem

2009-01-15 Thread Stuart Halloway


The improved error reposting in test-is breaks some tests, e.g. from  
the book:

(deftest test-lazy-index-of-any-with-match
  (is (with-out-str (is (zero? (index-of-any zzabyycdxx #{\z \a}
  Iterating overz\n)
  (is (with-out-str (is (= 3 (index-of-any zzabyycdxx #{\b \y}
  Iterating overz\nIterating over z\nIterating over a\n))

The problem is that it tries to take the value of with-out-str, not  
realizing that it is a macro.

Should I

(1) rewrite the test to not use a macro?
(2) take a stab at fixing this in test-is?
(3) get out of the way and let another Stuart handle it?  :-)

Stuart

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Re: A quasiquote for Clojure?


 unquotewould not be defined by Clojure, so still an error if allowed
  to get evaluated.

  Things like your sql would be macros that handled (unquotex)
  internally.

 SVN 1184 implements this.

 Feedback welcome on its utility for macro writers.

 Rich


I like this a lot.  Any chance of getting the same treatment for
unquote-splicing?

user '~x
(clojure.core/unquote x)
user '~...@x
; Exception: can't embed object in code
; Desired output: (clojure.core/unquote-splicing x)

Or am I just doing this wrong?

Thanks!
Jason
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Newbie question on agent here

2009-01-15 Thread wubbie


Hi
Came across Chouser's posting below:
I know *agent* is for global designation.

My question is how the first agent (agent nil) and *agent* used
later in another nested send-off related?
Also m after (fn is a function name so that it can be referred to
later inside the same function?

Thanks
sun


user= (def z (atom 0))
#'user/z
user= (send-off (agent nil) (fn m [_] (Thread/sleep 500) (swap! z
inc) (send-off *agent* m)))
#Agent clojure.lang.ag...@6fa9fc
user= @z
3
user= @z
8
user= (swap! z + 1000)
1031
user= @z
1035
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(newbie) running clojure app without repl

2009-01-15 Thread linh


Hi!
I've had no experience in Lisp or clojure before. I've only worked
with Java and Ruby, so this question may seem stupid. Is there any way
to run a clojure app without REPL?

For example something like: clojure my_app.clj

I've read that you can compile clojure with the comile function, but
this function must be called from a clojure application since it's a
clojure function, am I right or wrong?

Thanks,
Linh


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Re: (newbie) running clojure app without repl

2009-01-15 Thread Eric Lavigne



 Hi!
 I've had no experience in Lisp or clojure before. I've only worked
 with Java and Ruby, so this question may seem stupid. Is there any way
 to run a clojure app without REPL?

 For example something like: clojure my_app.clj


Something like this:

java-cpclojure.jar:my_app_dirclojure.lang.Scriptmy_app.clj

-- 
Education is what survives when what has been learned has been forgotten.

   - B. F. Skinner

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Re: Example Java oriented SWT GUI application in Clojure

2009-01-15 Thread e

anyone able to get this going on a Mac yet?  The main window comes up, but
shortly after crashes.

On Mon, Jan 12, 2009 at 5:24 PM, BerlinBrown berlin.br...@gmail.com wrote:


 Here is an example SWT application.  It is a 'search' tool.  Open a
 file and the search term is highlighted.  It has a java oriented
 approach because I copied the java code verbatim.  This might be
 useful if you are still used to imperative programming.

 Main source:

 http://jvmnotebook.googlecode.com/svn/trunk/clojure/swt/search/src/octane_main.clj

 Additional Files (all you really need is what is in the lib directory)
 http://jvmnotebook.googlecode.com/svn/trunk/clojure/swt/search

 But, I am all ears for suggestions (I am sure there are very, very
 many) and if you want, send me a patch file, I will be glad to update
 it.

 Might help for newbies like me.
 


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Re: Example Java oriented SWT GUI application in Clojure

2009-01-15 Thread Paul Barry

It's probably this:
http://www.eclipse.org/swt/faq.php#carbonapp

On Thu, Jan 15, 2009 at 9:20 PM, e evier...@gmail.com wrote:

 anyone able to get this going on a Mac yet?  The main window comes up, but
 shortly after crashes.


 On Mon, Jan 12, 2009 at 5:24 PM, BerlinBrown berlin.br...@gmail.comwrote:


 Here is an example SWT application.  It is a 'search' tool.  Open a
 file and the search term is highlighted.  It has a java oriented
 approach because I copied the java code verbatim.  This might be
 useful if you are still used to imperative programming.

 Main source:

 http://jvmnotebook.googlecode.com/svn/trunk/clojure/swt/search/src/octane_main.clj

 Additional Files (all you really need is what is in the lib directory)
 http://jvmnotebook.googlecode.com/svn/trunk/clojure/swt/search

 But, I am all ears for suggestions (I am sure there are very, very
 many) and if you want, send me a patch file, I will be glad to update
 it.

 Might help for newbies like me.



 


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Re: Utilities for clojure.contrib?


On Jan 14, 1:03 pm, Jason Wolfe jawo...@berkeley.edu wrote:
   (import '(java.util HashSet))
   (defn distinct-elts? Are all of the elements of this sequence
   distinct?  Works on infinite sequences with repititions, making it
   useful for, e.g., detecting cycles in graphs.
    [s]
    (let [hs (HashSet.)]
      (loop [s (seq s)]
        (cond (empty? s)                    true
              (.contains hs (first s))        false
              :else (do (.add hs (first s)) (recur (rest s)))

  Is there any reason the builtin 'distinct?' couldn't handle these
  cases as well?  What does elts stand for?

 I suppose this is the same as (apply distinct? s).  

Except that distinct? can't take 0 arguments, so (apply distinct? nil)
fails rather than returning true.  Does adding a 0-arg case to
distinct? sound reasonable?

-Jason
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Re: Synchronization Benchmarks

2009-01-15 Thread Stu Hood

Ah! but a mere hash table is not bi-directional :-)
Right =) I got the idea in a Channel 9 video about MS' efforts with STM:
http://channel9.msdn.com/shows/Going+Deep/Software-Transactional-Memory-The-Current-State-of-the-Art/(which
reminds me, the spin-lock approach they try is probably fairly close
to using an Atom in Clojure).

I made the changes that Christophe suggested, and added type hints for the
HashMaps used in CLJDict, and the speed improvement is very impressive. To
see the scalability of the different approaches, I graphed with various
numbers of threads and read percentages:
http://github.com/stuhood/clojure-conc/tree/master/results

Two conclusions:
1. The overhead for STM with low contention is very reasonable,
2. Optimism + MVCC + persistence fall down when faced with a majority of
writes. (see the 100% write case in the writes graph.)

Thanks,
Stu

On Thu, Jan 15, 2009 at 2:52 PM, Christian Vest Hansen karmazi...@gmail.com
wrote:

On Thu, Jan 15, 2009 at 8:47 PM, Christian Vest Hansen
karmazi...@gmail.com wrote:
On Thu, Jan 15, 2009 at 8:35 PM, Mark H. mark.hoem...@gmail.com wrote:
On Jan 15, 1:38 am, stuhood stuh...@gmail.com wrote:
The benchmark contains 4 bi-directional dictionary implementations:
...

Doesn't Java already have a more optimized thread-safe hash table that
works by locking individual buckets, rather than the whole table?
Maybe I'm just confused ;-P

Ah! but a mere hash table is not bi-directional :-)

--
Venlig hilsen / Kind regards,
Christian Vest Hansen.

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Re: (newbie) running clojure app without repl


There is a standalone compiler that runs without the REPL:
clojure.lang.Compile.  The best examples of using it are the Ant
build.xml files for Clojure and clojure-contrib.

If I have time tomorrow I'll try to post a more detailed how-to.

-Stuart Sierra


On Jan 15, 6:53 pm, linh nguyenlinh.m...@gmail.com wrote:
 Hi!
 I've had no experience in Lisp or clojure before. I've only worked
 with Java and Ruby, so this question may seem stupid. Is there any way
 to run a clojure app without REPL?

 For example something like: clojure my_app.clj

 I've read that you can compile clojure with the comile function, but
 this function must be called from a clojure application since it's a
 clojure function, am I right or wrong?

 Thanks,
 Linh
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Re: Macros in interaction with Functions


On Jan 15, 6:04 pm, Daniel Jomphe danieljom...@gmail.com wrote:
 And still, I wasn't prepared for the fact that macros don't mix 100%
 with functions. Either I overlooked an important section in these
 books, or they didn't really cover it much.

It's not covered much.  You get used to it.  Think of it this way --
macros only exist during compilation.  Functions like apply get
evaluated at run-time.  A macro like and has no value at run-time,
so you can't use it as an argument to a function.

-Stuart Sierra


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Re: test-is reporting problem


I was afraid that would happen.  I'll fix it, probably tomorrow.
-the other Stuart

On Jan 15, 6:27 pm, Stuart Halloway stuart.hallo...@gmail.com wrote:
 The improved error reposting in test-is breaks some tests, e.g. from  
 the book:

 (deftest test-lazy-index-of-any-with-match
   (is (with-out-str (is (zero? (index-of-any zzabyycdxx #{\z \a}
       Iterating overz\n)
   (is (with-out-str (is (= 3 (index-of-any zzabyycdxx #{\b \y}
       Iterating overz\nIterating over z\nIterating over a\n))

 The problem is that it tries to take the value of with-out-str, not  
 realizing that it is a macro.

 Should I

 (1) rewrite the test to not use a macro?
 (2) take a stab at fixing this in test-is?
 (3) get out of the way and let another Stuart handle it?  :-)

 Stuart
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Re: test-is reporting problem

2009-01-15 Thread Stu Hood

You do that.
-another Stuart


On Thu, Jan 15, 2009 at 10:32 PM, Stuart Sierra the.stuart.sie...@gmail.com
 wrote:


 I was afraid that would happen.  I'll fix it, probably tomorrow.
 -the other Stuart

 On Jan 15, 6:27 pm, Stuart Halloway stuart.hallo...@gmail.com wrote:
  The improved error reposting in test-is breaks some tests, e.g. from
  the book:
 
  (deftest test-lazy-index-of-any-with-match
(is (with-out-str (is (zero? (index-of-any zzabyycdxx #{\z \a}
Iterating overz\n)
(is (with-out-str (is (= 3 (index-of-any zzabyycdxx #{\b \y}
Iterating overz\nIterating over z\nIterating over a\n))
 
  The problem is that it tries to take the value of with-out-str, not
  realizing that it is a macro.
 
  Should I
 
  (1) rewrite the test to not use a macro?
  (2) take a stab at fixing this in test-is?
  (3) get out of the way and let another Stuart handle it?  :-)
 
  Stuart
 


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Re: Example Java oriented SWT GUI application in Clojure

2009-01-15 Thread e

yeah.  That fixed it.  Thanks.

On Thu, Jan 15, 2009 at 9:53 PM, Paul Barry pauljbar...@gmail.com wrote:

 It's probably this:
 http://www.eclipse.org/swt/faq.php#carbonapp


 On Thu, Jan 15, 2009 at 9:20 PM, e evier...@gmail.com wrote:

 anyone able to get this going on a Mac yet?  The main window comes up, but
 shortly after crashes.


 On Mon, Jan 12, 2009 at 5:24 PM, BerlinBrown berlin.br...@gmail.comwrote:


 Here is an example SWT application.  It is a 'search' tool.  Open a
 file and the search term is highlighted.  It has a java oriented
 approach because I copied the java code verbatim.  This might be
 useful if you are still used to imperative programming.

 Main source:

 http://jvmnotebook.googlecode.com/svn/trunk/clojure/swt/search/src/octane_main.clj

 Additional Files (all you really need is what is in the lib directory)
 http://jvmnotebook.googlecode.com/svn/trunk/clojure/swt/search

 But, I am all ears for suggestions (I am sure there are very, very
 many) and if you want, send me a patch file, I will be glad to update
 it.

 Might help for newbies like me.






 


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Mysterious performance anomalies