Re: Idiomatic way to include doc-string for multimethods.

2011-12-05 Thread Meikel Brandmeyer (kotarak)
Hi,

the first form is idiomatic. This seems to be a problem in emacs.

Sincerely
Meikel
 

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Re: Idiomatic way to include doc-string for multimethods.

2011-12-05 Thread Meikel Brandmeyer (kotarak)
Hi,

BTW: the linked discussion pre-dates the time when docstring support à la 
defn was added to defmulti. Now that it is available, you should use it 
just as for defn.

Sincerely
Meikel

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keyword with slash to string

2011-12-05 Thread finbeu
Hello,

weird, I know, but I have keywords in a map like this: 

:first/second 

I want to convert such a keyword to a string and I'm doing this with the 
name function. This doesn't work with a slash:

(def x :first/second)
(name x)
second

(The reason why I have such keywords at all is that data.json allows me to 
keywordize keys from a json map.)

Is there a function that returns the full string first/second?  
Or even better: is there a function that transforms a map with keywords to 
a map with Strings as keys? The constraint is that keywords can have a 
slash.

Thx.

- Finn 





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Re: keyword with slash to string

2011-12-05 Thread Meikel Brandmeyer (kotarak)
Hi,

(defn to-string-keys
  [the-map]
  (into (empty the-map) (for [[k v] the-map] [(if-let [nspace (namespace 
k)] (str nspace / (name k)) (name k)) v])))

Sincerely
Meikel

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Re: keyword with slash to string

2011-12-05 Thread finbeu
I'm impressed. Thank you very much!

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Re: keyword with slash to string

2011-12-05 Thread Meikel Brandmeyer (kotarak)
Hi,

keywords can qualified - just as symbols. Compare: :foo, :user/foo, ::foo 
(assuming you are in a fresh REPL). You can also use namespace aliases: 
(require '[some.name.space :as short]) ::short/foo.

(shameless-promotion self http://bit.ly/cqbm6F)

Sincerely
Meikel

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ANN: Clojure/West CFP

2011-12-05 Thread Alex Miller
Clojure/West is a new Clojure conference March 16-17th in San Jose,
CA.  The Clojure/West call for presentations is now open!  For full
details go here:
   http://clojurewest.org/call-for-presentations/

You can submit 50 minute sessions - speakers for these will receive
hotel, airfare, and admission to the conference - see the page for
more details.

You may also submit 25, 50, or 80 minute unsessions.  The
unsessions may be anything outside the normal speaker+slides format
- a guided discussion, a panel, a workshop, a working group, a hacker
dojo, a BOF, etc.  The facilitator/organizer of the unsession will
receive free admission.  The unsessions will be posted on the site in
early January with open voting!

We will also have lightning talks with an open call closer to the
conference.

All session and unsession talks must be submitted by January 6th!

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ANN: Clojure/West training March 12-15th

2011-12-05 Thread Alex Miller
In the week leading up to the Clojure/West conference, we will have
five training classes available:

- Mar 12-13, 14-15 - Clojure Web with Chris Granger (creator of Noir,
Pinot, Korma)
- Mar 13-15 - Cascalog with Sam Ritchie (committer on Cascalog)
- Mar 13-15 - Intro to Clojure with members of Clojure/core
- Mar 14-15 - Pallet with Hugo Duncan and Antoni Batchelli (lead
developers on Pallet)

Lots more info here:
http://clojurewest.org/training

Registration will open soon

Join the mailing list for future announcements:
http://eepurl.com/gP51T



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Re: Google chart library

2011-12-05 Thread Chris Gray
On Sun, 4 Dec 2011 21:53:39 -0800 (PST), thenwithexpandedwingshesteershisflight 
mathn...@gmail.com wrote:
 Has anyone tried using the google chart library in Clojurescript ?
 
 http://code.google.com/apis/chart/interactive/docs/quick_start.html
 
 - it uses a dynamically-loaded-from-the-web api that I cannot work out
 quickly how to deal with. It's not google closure-style javascript by
 the looks of things.

I don't know if anyone has or not, but you might have a look at projects
that use google maps.  It has the same sort of api loaded from the web.
My little google map project is
https://github.com/chrismgray/spot-tracks but I'm sure there are others
as well.

Cheers,
Chris

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Re: Unexpected behaviour in unchecked-multiply when using vars as arguments

2011-12-05 Thread Stuart Sierra
  (side note: what is different between Long/MAX_VALUE and the 
 function call (Long/MAX_VALUE)?

None. Both are syntax sugar for (. Long MAX_VALUE)

 It seems like unchecked-multiply doesn't like vars, but thats surprising.
 What am I doing wrong here?

unchecked-multiply only does unchecked arithmetic when the arguments are 
primitive. Vars cannot have primitive values, they must be boxed as 
java.lang.Long. So it reverts to normal Clojure arithmetic.

The unchecked-* functions are intended as a performance optimization when 
doing operations with primitives.

-S

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Re: Google chart library

2011-12-05 Thread Sam Ritchie
Here's a Google Maps Clojurescript example of mine that might be helpful:
https://github.com/sritchie/contour

Cheers,
Sam

On Mon, Dec 5, 2011 at 6:48 AM, Chris Gray chrismg...@gmail.com wrote:

 On Sun, 4 Dec 2011 21:53:39 -0800 (PST),
 thenwithexpandedwingshesteershisflight mathn...@gmail.com wrote:
  Has anyone tried using the google chart library in Clojurescript ?
 
  http://code.google.com/apis/chart/interactive/docs/quick_start.html
 
  - it uses a dynamically-loaded-from-the-web api that I cannot work out
  quickly how to deal with. It's not google closure-style javascript by
  the looks of things.

 I don't know if anyone has or not, but you might have a look at projects
 that use google maps.  It has the same sort of api loaded from the web.
 My little google map project is
 https://github.com/chrismgray/spot-tracks but I'm sure there are others
 as well.

 Cheers,
 Chris

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703.662.1337
@sritchie09

(Too brief? Here's why! http://emailcharter.org)

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[ANN] Clojure Koan-Engine 0.1.1

2011-12-05 Thread Sam Ritchie
Hey all,

I've separated out the macro magic behind the wonderful
clojure-koanshttps://github.com/functional-koans/clojure-koans into
its own project
(clojure-koan-enginehttps://github.com/functional-koans/clojure-koan-engine),
making it easy for anyone to write koans for any clojure library! Thanks to
Colin Jones and Aaron Bedra for letting me help out on this.

For those of you who haven't seen one yet, a clojure koan is pairing of
doc-string and some clojure form that evaluates to something truthy once
its blanks are filled in. For example (from the clojure sets
koanshttps://github.com/functional-koans/clojure-koans/blob/master/src/koans/sets.clj
):

(meditations
**You can create a set in two ways.
(= #{} (set __))
 )

To make it really easy to start writing koans, I've also created a koan
project template https://github.com/functional-koans/koan-template
and aLeiningen pluginhttps://github.com/functional-koans/lein-koan.
The latter allows you to add koans even to existing projects, providing a
sort of built-in tutorial that encourages users to dig into the code. The
READMEs are bountiful! You should partake of them.

Finally, here are a few placeholder projects I've created with the template
generator that I intend to populate in the next month:

https://github.com/sritchie/cascalog-koans
https://github.com/sritchie/core.logic-koans
https://github.com/sritchie/core.match-koans

Enjoy!
Sam

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@sritchie09

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Re: A few enhancements

2011-12-05 Thread joegallo
I've added a new ticket http://dev.clojure.org/jira/browse/CLJ-891 to jira 
for adding the ability to make (symbol some-ns bar) work.  That tackles 
half of the issue in #4, and reduces your example to just (symbol *ns* 
(name sym)).

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Re: [ANN] Clojure Koan-Engine 0.1.1

2011-12-05 Thread David Nolen
On Mon, Dec 5, 2011 at 11:10 AM, Sam Ritchie sritchi...@gmail.com wrote:

 Hey all,

 I've separated out the macro magic behind the wonderful 
 clojure-koanshttps://github.com/functional-koans/clojure-koans into
 its own project 
 (clojure-koan-enginehttps://github.com/functional-koans/clojure-koan-engine),
 making it easy for anyone to write koans for any clojure library! Thanks to
 Colin Jones and Aaron Bedra for letting me help out on this.

 For those of you who haven't seen one yet, a clojure koan is pairing of
 doc-string and some clojure form that evaluates to something truthy once
 its blanks are filled in. For example (from the clojure sets 
 koanshttps://github.com/functional-koans/clojure-koans/blob/master/src/koans/sets.clj
 ):

 (meditations
 **You can create a set in two ways.
 (= #{} (set __))
  )

 To make it really easy to start writing koans, I've also created a koan
 project template https://github.com/functional-koans/koan-template and 
 aLeiningen pluginhttps://github.com/functional-koans/lein-koan.
 The latter allows you to add koans even to existing projects, providing a
 sort of built-in tutorial that encourages users to dig into the code. The
 READMEs are bountiful! You should partake of them.

 Finally, here are a few placeholder projects I've created with the
 template generator that I intend to populate in the next month:

 https://github.com/sritchie/cascalog-koans
 https://github.com/sritchie/core.logic-koans
  https://github.com/sritchie/core.match-koans

 Enjoy!
 Sam

 --
 Sam Ritchie, Twitter Inc
 703.662.1337
 @sritchie09


Very cool.

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Re: Clojure Koan-Engine 0.1.1

2011-12-05 Thread Fogus
Really great.  Looking forward to boring everyone with contracts-
koans.  The next step is to have this project spit out a 4clojure-
esque site automatically.  ;-)

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Ending or closing malformed line in REPL

2011-12-05 Thread jlhouchin
Hello,

While I am going through the Programming Clojure 2nd edition book, I
am entering the code into a REPL.

Sometimes when entering the code I enter a typo and hit enter and
cannot get the REPL to close that malformed line.

It often happens with an errant closing ] or ).
Frequently this occurs when I go back in the history to edit a
previous line to edit, explore and play with it. The closing paren is
already in the line and I accidentally hit enter.

I would love to know how I can cause that line to execute, and give me
the error, so that I can go on and try again.

Currently I end up having to exit the REPL and create a new one.

If that is the only thing I can do, that is fine. I just wanted to
learn if there was some other means of completing that line.

Thanks.

Jimmie

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Re: Unexpected behaviour in unchecked-multiply when using vars as arguments

2011-12-05 Thread Linus Ericsson
2011/12/5 Stuart Sierra the.stuart.sie...@gmail.com

   (side note: what is different between Long/MAX_VALUE and the
  function call (Long/MAX_VALUE)?

 None. Both are syntax sugar for (. Long MAX_VALUE)


  It seems like unchecked-multiply doesn't like vars, but thats surprising.
  What am I doing wrong here?

 unchecked-multiply only does unchecked arithmetic when the arguments are
 primitive. Vars cannot have primitive values, they must be boxed as
 java.lang.Long. So it reverts to normal Clojure arithmetic.

 The unchecked-* functions are intended as a performance optimization when
 doing operations with primitives.


OK, then the problem seems to be to refer to primitives with symbols with
unchecked-* functions. How do I do that?

The loop where high performance is required is

hash = -3750763034362895579
for each byte b in array-of-bytes-to-be-hashed do :
hash = hash * 1099511628211 (without caring about overflowing)
hash = hash ^ byte
return hash

and I really cannot see how to do this without using something that hold
values somehow, but how do I bypass the numeric stack in clojure?

I have tried with the following approach (just for the first step):

fnv (def hash (Long. -3750763034362895579))
#'fnv/hash
fnv (def hash2 (Long. (unchecked-multiply hash 1099511628211)))
; Evaluation aborted. (because of integer overflow)

How should I do to get it working correctly? There simply must be a way to
store primitives, but I'm apparently have gotten something wrong here.

(the hash in question is the quite quick FNV-hash, which is in public
domain, nice and everything)

/Linus

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Re: Unexpected behaviour in unchecked-multiply when using vars as arguments

2011-12-05 Thread David Nolen
You can't store primitives in vars. But you can cast their contents to
primitives with (long ...) (int ...) etc

David

On Mon, Dec 5, 2011 at 12:16 PM, Linus Ericsson 
oscarlinuserics...@gmail.com wrote:



 2011/12/5 Stuart Sierra the.stuart.sie...@gmail.com

   (side note: what is different between Long/MAX_VALUE and the
  function call (Long/MAX_VALUE)?

 None. Both are syntax sugar for (. Long MAX_VALUE)


  It seems like unchecked-multiply doesn't like vars, but thats
 surprising.
  What am I doing wrong here?

 unchecked-multiply only does unchecked arithmetic when the arguments are
 primitive. Vars cannot have primitive values, they must be boxed as
 java.lang.Long. So it reverts to normal Clojure arithmetic.

 The unchecked-* functions are intended as a performance optimization when
 doing operations with primitives.


 OK, then the problem seems to be to refer to primitives with symbols with
 unchecked-* functions. How do I do that?

 The loop where high performance is required is

 hash = -3750763034362895579
 for each byte b in array-of-bytes-to-be-hashed do :
 hash = hash * 1099511628211 (without caring about overflowing)
 hash = hash ^ byte
 return hash

 and I really cannot see how to do this without using something that hold
 values somehow, but how do I bypass the numeric stack in clojure?

 I have tried with the following approach (just for the first step):

 fnv (def hash (Long. -3750763034362895579))
 #'fnv/hash
 fnv (def hash2 (Long. (unchecked-multiply hash 1099511628211)))
 ; Evaluation aborted. (because of integer overflow)

 How should I do to get it working correctly? There simply must be a way to
 store primitives, but I'm apparently have gotten something wrong here.

 (the hash in question is the quite quick FNV-hash, which is in public
 domain, nice and everything)

 /Linus

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Re: Unexpected behaviour in unchecked-multiply when using vars as arguments

2011-12-05 Thread Linus Ericsson
David and Stu to the rescue. Of course that's the way to do it.

Thank you both,

/Linus

2011/12/5 David Nolen dnolen.li...@gmail.com

 You can't store primitives in vars. But you can cast their contents to
 primitives with (long ...) (int ...) etc

 David

 On Mon, Dec 5, 2011 at 12:16 PM, Linus Ericsson 
 oscarlinuserics...@gmail.com wrote:



 2011/12/5 Stuart Sierra the.stuart.sie...@gmail.com

   (side note: what is different between Long/MAX_VALUE and the
  function call (Long/MAX_VALUE)?

 None. Both are syntax sugar for (. Long MAX_VALUE)


  It seems like unchecked-multiply doesn't like vars, but thats
 surprising.
  What am I doing wrong here?

 unchecked-multiply only does unchecked arithmetic when the arguments are
 primitive. Vars cannot have primitive values, they must be boxed as
 java.lang.Long. So it reverts to normal Clojure arithmetic.

 The unchecked-* functions are intended as a performance optimization
 when doing operations with primitives.


 OK, then the problem seems to be to refer to primitives with symbols with
 unchecked-* functions. How do I do that?

 The loop where high performance is required is

 hash = -3750763034362895579
 for each byte b in array-of-bytes-to-be-hashed do :
 hash = hash * 1099511628211 (without caring about overflowing)
 hash = hash ^ byte
 return hash

 and I really cannot see how to do this without using something that hold
 values somehow, but how do I bypass the numeric stack in clojure?

 I have tried with the following approach (just for the first step):

 fnv (def hash (Long. -3750763034362895579))
 #'fnv/hash
 fnv (def hash2 (Long. (unchecked-multiply hash 1099511628211)))
 ; Evaluation aborted. (because of integer overflow)

 How should I do to get it working correctly? There simply must be a way
 to store primitives, but I'm apparently have gotten something wrong here.

 (the hash in question is the quite quick FNV-hash, which is in public
 domain, nice and everything)

 /Linus

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Re: Unexpected behaviour in unchecked-multiply when using vars as arguments

2011-12-05 Thread David Powell
On Mon, Dec 5, 2011 at 5:29 PM, Linus Ericsson oscarlinuserics...@gmail.com
 wrote:

 David and Stu to the rescue. Of course that's the way to do it.


Not sure if this is what you want, but Clojure 1.3 introduced ^:const.
 This lets you store a primitive constant value:

  (def ^:const hash -3750763034362895579)

Then you can use hash anywhere as if you'd inlined the value.  hash will be
stored as a primitive, and will work with unchecked-multiply.

-- 
Dave

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Re: Ending or closing malformed line in REPL

2011-12-05 Thread jlhouchin
My apologies for the noise.

I had entered
(interleave (whole-numbers) [A B C] [)
on the repl and hit enter.

When I went back and tried again and looked and looked. The problem is
the open string  prior to what appears to be a closing paren. In this
instance it isn't a closing paren but a part of the string which is
waiting to be closed. When I entered the closing  and then closing
paren. I was fine.

I should have provided more context in the original post and you could
have seen my error.

Again, my apologies.

Jimmie

On Dec 5, 11:03 am, jlhouchin jlhouc...@gmail.com wrote:
 Hello,

 While I am going through the Programming Clojure 2nd edition book, I
 am entering the code into a REPL.

 Sometimes when entering the code I enter a typo and hit enter and
 cannot get the REPL to close that malformed line.

 It often happens with an errant closing ] or ).
 Frequently this occurs when I go back in the history to edit a
 previous line to edit, explore and play with it. The closing paren is
 already in the line and I accidentally hit enter.

 I would love to know how I can cause that line to execute, and give me
 the error, so that I can go on and try again.

 Currently I end up having to exit the REPL and create a new one.

 If that is the only thing I can do, that is fine. I just wanted to
 learn if there was some other means of completing that line.

 Thanks.

 Jimmie

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swank-cdt problems

2011-12-05 Thread AndyK
I'd like to be using swank-cdt, but I'm running into the tools.jar
problem

warning: unabled to add tools.jar to classpath.
CDT  1.4.0a startup failed:  #RuntimeException
java.lang.RuntimeException: java.io.IOException: Not a debuggee, or
not listening for debugger to attach

In project.clj, I've tried
:extra-classpath-dirs [/usr/lib/jvm/java-6-sun/lib/tools.jar]
and
:dev-resources-path /usr/lib/jvm/java-6-openjdk/lib/tools.jar

Neither worked

I've also tried symlinking tools.jar as mentioned here
http://groups.google.com/group/clojure/msg/70236500461be9c6?dmode=source

I have swank 1.4.0-SNAPSHOT installed as a leiningen plugin and I run
it in Emacs23 using M-x clojure-jack-in

Any suggestions?

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Re: swank-cdt problems

2011-12-05 Thread AndyK
After a bit more messing around - the problem is a little different...

I fixed the swank plugin version to 1.4.0-SNAPSHOT and updated clojure-
mode to 1.11.4

Now I get
error in process filter: Search failed: (run-hooks 'slime-load-
hook) ; on port
when I try to run clojure-jack-in

Thoughts?

On Dec 5, 1:32 pm, AndyK andy.kri...@gmail.com wrote:
 I'd like to be using swank-cdt, but I'm running into the tools.jar
 problem

 warning: unabled to add tools.jar to classpath.
 CDT  1.4.0a startup failed:  #RuntimeException
 java.lang.RuntimeException: java.io.IOException: Not a debuggee, or
 not listening for debugger to attach

 In project.clj, I've tried
 :extra-classpath-dirs [/usr/lib/jvm/java-6-sun/lib/tools.jar]
 and
 :dev-resources-path /usr/lib/jvm/java-6-openjdk/lib/tools.jar

 Neither worked

 I've also tried symlinking tools.jar as mentioned 
 herehttp://groups.google.com/group/clojure/msg/70236500461be9c6?dmode=source

 I have swank 1.4.0-SNAPSHOT installed as a leiningen plugin and I run
 it in Emacs23 using M-x clojure-jack-in

 Any suggestions?

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Re: swank-cdt problems

2011-12-05 Thread George Jahad
this error:
java.io.IOException: Not a debuggee, or not listening for debugger to
attach

is usually caused by not having this line in your project.clj:
  :jvm-opts [-agentlib:jdwp=transport=dt_socket,server=y,suspend=n]

if that doesn't fix your problem, send me your project.clj and the
name of your OS.

Also, I never use clojure-jack-in, so that may also be a part of the
problem.  I'll look into it, but in the meantime, can you also try
using lein swank and then M-x slime-connect.


On Dec 5, 10:32 am, AndyK andy.kri...@gmail.com wrote:
 I'd like to be using swank-cdt, but I'm running into the tools.jar
 problem

 warning: unabled to add tools.jar to classpath.
 CDT  1.4.0a startup failed:  #RuntimeException
 java.lang.RuntimeException: java.io.IOException: Not a debuggee, or
 not listening for debugger to attach

 In project.clj, I've tried
 :extra-classpath-dirs [/usr/lib/jvm/java-6-sun/lib/tools.jar]
 and
 :dev-resources-path /usr/lib/jvm/java-6-openjdk/lib/tools.jar

 Neither worked

 I've also tried symlinking tools.jar as mentioned 
 herehttp://groups.google.com/group/clojure/msg/70236500461be9c6?dmode=source

 I have swank 1.4.0-SNAPSHOT installed as a leiningen plugin and I run
 it in Emacs23 using M-x clojure-jack-in

 Any suggestions?

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Re: Unexpected behaviour in unchecked-multiply when using vars as arguments

2011-12-05 Thread Linus Ericsson
Thats a great feature as well! It is very good not to clutter the code with
magic constants, but to be able to name them in a sane way.

Thank you all again,

/Linus
 Den 5 dec 2011 18:38 skrev David Powell djpow...@djpowell.net:



 On Mon, Dec 5, 2011 at 5:29 PM, Linus Ericsson 
 oscarlinuserics...@gmail.com wrote:

 David and Stu to the rescue. Of course that's the way to do it.


 Not sure if this is what you want, but Clojure 1.3 introduced ^:const.
  This lets you store a primitive constant value:

   (def ^:const hash -3750763034362895579)

 Then you can use hash anywhere as if you'd inlined the value.  hash will
 be stored as a primitive, and will work with unchecked-multiply.

 --
 Dave

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core.logic and arithmetic equations?

2011-12-05 Thread nchurch
I'm wondering if core.logic can be used to solve equations over reals
or rationals; all the examples I've seen are with with integers and
'Oleg numbers'.  I'm talking about something like this:

http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-22.html#%_sec_3.3.5

What spurred me was this week's unit of the Stanford AI class, where
you have to get multiple values out of an equation like X1 = x2* (f/
Z).  Seems like a case for relational programming, but it's not with
LVars!

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Re: core.logic and arithmetic equations?

2011-12-05 Thread David Nolen
I'm a third (?) of the way through implementing cKanren which brings
Constraint Logic Programming (CLP) to core.logic. It going a bit slower
than expected since this is not a simple port - I'm making quite a few
representation / efficiency changes. cKanren supports arithmetic w/
integers, CLP(FD). It also supports CLP(Tree), which is constraint logic
programming over tree terms (Clojure persistent data structures).

Once cKanren is up and running it shouldn't be hard for someone to extend
core.logic to handle reals - CLP(R).

David

On Mon, Dec 5, 2011 at 4:08 PM, nchurch nchubr...@gmail.com wrote:

 I'm wondering if core.logic can be used to solve equations over reals
 or rationals; all the examples I've seen are with with integers and
 'Oleg numbers'.  I'm talking about something like this:

 http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-22.html#%_sec_3.3.5

 What spurred me was this week's unit of the Stanford AI class, where
 you have to get multiple values out of an equation like X1 = x2* (f/
 Z).  Seems like a case for relational programming, but it's not with
 LVars!

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Re: core.logic and arithmetic equations?

2011-12-05 Thread nchurch
David:

Very good news.  This stuff is awesome as is, but still really excited
to see cKanren in all its optimized glory! Thanks for all your work on
it.

Nick.

On Dec 5, 4:13 pm, David Nolen dnolen.li...@gmail.com wrote:
 I'm a third (?) of the way through implementing cKanren which brings
 Constraint Logic Programming (CLP) to core.logic. It going a bit slower
 than expected since this is not a simple port - I'm making quite a few
 representation / efficiency changes. cKanren supports arithmetic w/
 integers, CLP(FD). It also supports CLP(Tree), which is constraint logic
 programming over tree terms (Clojure persistent data structures).

 Once cKanren is up and running it shouldn't be hard for someone to extend
 core.logic to handle reals - CLP(R).

 David







 On Mon, Dec 5, 2011 at 4:08 PM, nchurch nchubr...@gmail.com wrote:
  I'm wondering if core.logic can be used to solve equations over reals
  or rationals; all the examples I've seen are with with integers and
  'Oleg numbers'.  I'm talking about something like this:

 http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-22.html#%_sec_3.3.5

  What spurred me was this week's unit of the Stanford AI class, where
  you have to get multiple values out of an equation like X1 = x2* (f/
  Z).  Seems like a case for relational programming, but it's not with
  LVars!

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Re: on lisp and scheme macros

2011-12-05 Thread Jose A. Ortega Ruiz
On Sat, Dec 03 2011, Stuart Sierra wrote:

 I think that Common Lisp macros are, strictly speaking, more powerful
 than Scheme macros, but I don't have a citation.

That's only true for syntax-rules macros.  syntax-case macros, which
most schemes provide and are required by R6RS, are, strictly speaking,
more powerful than CL macros.

jao
-- 
I went to the woods because I wished to live deliberately, to front only the
essential facts of life, and see if I could not learn what it had to teach,
and not, when I came to die, discover that I had not lived.
 -Henry David Thoreau, naturalist and author (1817-1862)

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No longer able to write a UUID to Postgres with ClojureQL

2011-12-05 Thread Don Jackson

For those of you following along at home, my spate of bad luck continues….

A week or so ago, I was happily writing and reading UUIDs into Postgres with 
ClojureQL.
Then, all of a sudden, it stopped working, and I can't figure out why.

Shame on me for not being more careful about documenting when it worked, and 
what changed.  
And a lot of stuff changed in the interim…

So I wrote small example project to demonstrate the problem:

I have verified that I can write UUIDs into Postgres with java.jdbc itself, so 
that is evidence that the issue is not with java.jdbc, the Postgres JDBC 
library, nor my Postgres server.

(def u1 (. UUID (randomUUID)))
(def u2 (. UUID (randomUUID)))

(defn write-uuid-jdbc
  [uid name]
  (sql/with-connection postgres-db
(sql/insert-values
 :testuuid
 [:uid :name]
 [uid name])))

(defn read-table-clojureql
  []
  @(table postgres-db :testuuid))

(defn write-uuid-clojureql
  [uid name]
  (conj! (table postgres-db :testuuid)
 {:uid uid :name name}))

This illustrates the problem:

(write-uuid-jdbc u1 jdbc) 

works.

(write-uuid-clojureql u2 clojureql) 

throws the following exception:

Bad value for type int : d812274a-a1ff-4ce5-962e-005f3c893459
  [Thrown class org.postgresql.util.PSQLException]

Restarts:
 0: [QUIT] Quit to the SLIME top level

Backtrace:
  0: 
org.postgresql.jdbc2.AbstractJdbc2ResultSet.toInt(AbstractJdbc2ResultSet.java:2759)
  1: 
org.postgresql.jdbc2.AbstractJdbc2ResultSet.getInt(AbstractJdbc2ResultSet.java:2003)

Now write u2 with jdbc:

(write-uuid-jdbc u2 jdbc)

And read the entire table back out using ClojureQL:

(read-table-clojureql)

({:name jdbc, :uid #UUID 2896de2b-2c48-40ab-83a6-cee6c2be16cd} 
 {:name jdbc, :uid #UUID d812274a-a1ff-4ce5-962e-005f3c893459})

So ClojureQL can certainly read the table, and return the UUIDs, but can't 
write them…

Here is the relevant part of project.clj:

  :dependencies [[org.clojure/clojure 1.2.1]
 [postgresql/postgresql 9.1-901.jdbc4]
 [org.clojure/java.jdbc 0.1.1]
 [clojureql 1.1.0-SNAPSHOT]
 ])

I woud definitely appreciate/welcome any suggestions about why this is 
happening, or how it might be fixed….

I've pushed this example test case/project up to GitHub in case anyone wants to 
poke around:

dcj/postgres-uuid-test 

Don







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Re: Clojure + Java Interop + Gnome Interop -- KeyPressEvent fails

2011-12-05 Thread Rett Kent

On 12/03/2011 10:16 AM, Henrik Lundahl wrote:

Hi Rett

There is no such type as org.gnome.gtk.Window$__KeyPressEvents, at least
not in 4.1 of the Java Gnome API
http://java-gnome.sourceforge.net/doc/api/4.1/org/gnome/gtk/Window.html.  
org.gnome.gtk.Window$__KeyPressEvent
exists though. I'd guess you have a typo somewhere, perhaps in the imports?


Not a terribly auspicious first post for technical assistance, I'm 
afraid.  KeyPressEvents was indeed a typo on my part.  The two changes 
that seemed to make a difference are to change 'KeyPressEvents' to 
'KeyPressEvent' and to separate the proxy statements into two connect 
clauses.  I'm not sure why that was necessary, but the following did work.



(import '(org.gnome.gtk Button Button$Clicked Gtk Label VBox Widget 
Window Window$DeleteEvent Widget$KeyPressEvent))


(Gtk/init (make-array String 0))
;(defonce gtk-init (.init Gtk (make-array String 0)))

(defn pushme []
  (let [w (Window.)
v (VBox. false 3)
l (Label. Go ahead:\nMake my day)
b (Button. Press me!)]
(.connect b
  (proxy [Button$Clicked] []
(onClicked [source]
  (println (str I was clicked:  (.getLabel b)))
  (println (str I was clicked:  source))
  )))
(.connect w
  (proxy [Widget$KeyPressEvent] []
(onKeyPressEvent [source event]
  (println (str Key was pressed:  (.toString 
(.getKeyval event

  false)
))

(.connect w
  (proxy [Window$DeleteEvent] []
(onDeleteEvent [source event]
  (Gtk/mainQuit) false)
(onDeleteEvents [source event]
  (Gtk/mainQuit) false)
))
(.add v l)
(.add v b)
(.add w v)
(.setDefaultSize w 200 100)
(.setTitle w Push Me)
(.showAll w)
(Gtk/main)
)
  )

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Re: Ending or closing malformed line in REPL

2011-12-05 Thread Stephen Compall
On Mon, 2011-12-05 at 09:51 -0800, jlhouchin wrote:
 When I entered the closing  and then closing
 paren. I was fine.

You may also try backspace; unusually for a REPL, that works.

-- 
Stephen Compall
^aCollection allSatisfy: [:each|aCondition]: less is better

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Re: No longer able to write a UUID to Postgres with ClojureQL

2011-12-05 Thread Sean Corfield
If it helps someone debug this for Don (since he and I discussed this off-list):

The stack trace from ClojureQL originates in its function to return
generated keys and it's calling .getInt on the (generated) key which
fails because it's a UUID.

So the question is probably: why is ClojureQL assuming all generated
keys are integers?

As for what might have changed in Don's setup, I wondered if the :uid
column definition had been changed to indicate (to ClojureQL) that it
is a potentially generated key?

(is there a ClojureQL mailing list?)

Sean

On Mon, Dec 5, 2011 at 3:27 PM, Don Jackson
cloj...@clark-communications.com wrote:

 For those of you following along at home, my spate of bad luck continues….

 A week or so ago, I was happily writing and reading UUIDs into Postgres with
 ClojureQL.
 Then, all of a sudden, it stopped working, and I can't figure out why.

 Shame on me for not being more careful about documenting when it worked, and
 what changed.
 And a lot of stuff changed in the interim…

 So I wrote small example project to demonstrate the problem:

 I have verified that I can write UUIDs into Postgres with java.jdbc itself,
 so that is evidence that the issue is not with java.jdbc, the Postgres JDBC
 library, nor my Postgres server.

 (def u1 (. UUID (randomUUID)))
 (def u2 (. UUID (randomUUID)))

 (defn write-uuid-jdbc
   [uid name]
   (sql/with-connection postgres-db
     (sql/insert-values
      :testuuid
      [:uid :name]
      [uid name])))

 (defn read-table-clojureql
   []
   @(table postgres-db :testuuid))

 (defn write-uuid-clojureql
   [uid name]
   (conj! (table postgres-db :testuuid)
              {:uid uid :name name}))


 This illustrates the problem:

 (write-uuid-jdbc u1 jdbc)


 works.

 (write-uuid-clojureql u2 clojureql)


 throws the following exception:

 Bad value for type int : d812274a-a1ff-4ce5-962e-005f3c893459

   [Thrown class org.postgresql.util.PSQLException]

 Restarts:

  0: [QUIT] Quit to the SLIME top level

 Backtrace:

   0:
 org.postgresql.jdbc2.AbstractJdbc2ResultSet.toInt(AbstractJdbc2ResultSet.java:2759)

   1:
 org.postgresql.jdbc2.AbstractJdbc2ResultSet.getInt(AbstractJdbc2ResultSet.java:2003)


 Now write u2 with jdbc:

 (write-uuid-jdbc u2 jdbc)


 And read the entire table back out using ClojureQL:

 (read-table-clojureql)

 ({:name jdbc, :uid #UUID 2896de2b-2c48-40ab-83a6-cee6c2be16cd}
  {:name jdbc, :uid #UUID d812274a-a1ff-4ce5-962e-005f3c893459})


 So ClojureQL can certainly read the table, and return the UUIDs, but can't
 write them…

 Here is the relevant part of project.clj:

   :dependencies [[org.clojure/clojure 1.2.1]
[postgresql/postgresql 9.1-901.jdbc4]
[org.clojure/java.jdbc 0.1.1]
[clojureql 1.1.0-SNAPSHOT]
])


 I woud definitely appreciate/welcome any suggestions about why this is
 happening, or how it might be fixed….

 I've pushed this example test case/project up to GitHub in case anyone wants
 to poke around:

 dcj/postgres-uuid-test

 Don

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Re: Ending or closing malformed line in REPL

2011-12-05 Thread jlhouchin
On 12/5/2011 7:19 PM, Stephen Compall wrote:
 On Mon, 2011-12-05 at 09:51 -0800, jlhouchin wrote:
 When I entered the closing  and then closing
 paren. I was fine.

 You may also try backspace; unusually for a REPL, that works.

I tried that. But as I was on a new line after hitting the enter/
return key. It wouldn't go back to the previous line.  I would have
loved that it did. That the backspace could backspace over newlines.
That would be sweet.

Now, I do not know if there are any difference in repls or if there is
only one repl. I was using the default 1.3 repl.

Thanks.

Jimmie

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Re: Google chart library

2011-12-05 Thread thenwithexpandedwingshesteershisflight
cheers guys that's very helpful

On Dec 6, 2:43 am, Sam Ritchie sritchi...@gmail.com wrote:
 Here's a Google Maps Clojurescript example of mine that might be 
 helpful:https://github.com/sritchie/contour

 Cheers,
 Sam









 On Mon, Dec 5, 2011 at 6:48 AM, Chris Gray chrismg...@gmail.com wrote:
  On Sun, 4 Dec 2011 21:53:39 -0800 (PST),
  thenwithexpandedwingshesteershisflight mathn...@gmail.com wrote:
   Has anyone tried using the google chart library in Clojurescript ?

  http://code.google.com/apis/chart/interactive/docs/quick_start.html

   - it uses a dynamically-loaded-from-the-web api that I cannot work out
   quickly how to deal with. It's not google closure-style javascript by
   the looks of things.

  I don't know if anyone has or not, but you might have a look at projects
  that use google maps.  It has the same sort of api loaded from the web.
  My little google map project is
 https://github.com/chrismgray/spot-tracksbut I'm sure there are others
  as well.

  Cheers,
  Chris

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Re: Ending or closing malformed line in REPL

2011-12-05 Thread Laurent PETIT
2011/12/6 jlhouchin jlhouc...@gmail.com:
 On 12/5/2011 7:19 PM, Stephen Compall wrote:
 On Mon, 2011-12-05 at 09:51 -0800, jlhouchin wrote:
 When I entered the closing  and then closing
 paren. I was fine.

 You may also try backspace; unusually for a REPL, that works.

 I tried that. But as I was on a new line after hitting the enter/
 return key. It wouldn't go back to the previous line.  I would have
 loved that it did. That the backspace could backspace over newlines.
 That would be sweet.

 Now, I do not know if there are any difference in repls or if there is
 only one repl. I was using the default 1.3 repl.

There are also REPLs embedded in all the major editors / IDEs. As a
shameless plug, I'd say that the namespace of Counterclockwise, a
Clojure Feature for Eclipse, does the job quite well (input history,
syntax coloration, code completion, hyperlinks, non-blocking sends,
multiline input area with auto-indentation, namespace browser with
search box  documentation on mouse over / go to source on mouse
double click, etc.)

If you're interested, go to its Getting Started page :
http://dev.clojure.org/display/doc/Getting+Started+with+Eclipse+and+Counterclockwise

If you do not know / like Eclipse, then just start again from this
general starting page to see what best suits your needs:
http://dev.clojure.org/display/doc/Getting+Started

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Re: Ending or closing malformed line in REPL

2011-12-05 Thread Laurent PETIT
2011/12/6 Laurent PETIT laurent.pe...@gmail.com:
 2011/12/6 jlhouchin jlhouc...@gmail.com:
 On 12/5/2011 7:19 PM, Stephen Compall wrote:
 On Mon, 2011-12-05 at 09:51 -0800, jlhouchin wrote:
 When I entered the closing  and then closing
 paren. I was fine.

 You may also try backspace; unusually for a REPL, that works.

 I tried that. But as I was on a new line after hitting the enter/
 return key. It wouldn't go back to the previous line.  I would have
 loved that it did. That the backspace could backspace over newlines.
 That would be sweet.

 Now, I do not know if there are any difference in repls or if there is
 only one repl. I was using the default 1.3 repl.

 There are also REPLs embedded in all the major editors / IDEs. As a
 shameless plug, I'd say that the namespace of Counterclockwise, a

s/namespace/REPL/

 Clojure Feature for Eclipse, does the job quite well (input history,
 syntax coloration, code completion, hyperlinks, non-blocking sends,
 multiline input area with auto-indentation, namespace browser with
 search box  documentation on mouse over / go to source on mouse
 double click, etc.)

 If you're interested, go to its Getting Started page :
 http://dev.clojure.org/display/doc/Getting+Started+with+Eclipse+and+Counterclockwise

 If you do not know / like Eclipse, then just start again from this
 general starting page to see what best suits your needs:
 http://dev.clojure.org/display/doc/Getting+Started

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Re: Ending or closing malformed line in REPL

2011-12-05 Thread Petr Gladkikh
Clojure REPL in Counterclockwise
(http://code.google.com/p/counterclockwise/) is pretty nice.
And yes, allowing multi-line expressions and having no way to edit
them is annoying.

On Tue, Dec 6, 2011 at 11:45 AM, jlhouchin jlhouc...@gmail.com wrote:
 On 12/5/2011 7:19 PM, Stephen Compall wrote:
 On Mon, 2011-12-05 at 09:51 -0800, jlhouchin wrote:
 When I entered the closing  and then closing
 paren. I was fine.

 You may also try backspace; unusually for a REPL, that works.

 I tried that. But as I was on a new line after hitting the enter/
 return key. It wouldn't go back to the previous line.  I would have
 loved that it did. That the backspace could backspace over newlines.
 That would be sweet.

 Now, I do not know if there are any difference in repls or if there is
 only one repl. I was using the default 1.3 repl.

 Thanks.

 Jimmie

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