Re: clojure, not the go to for data science

2019-11-07 Thread Brad Blood 
Not sure how helpful this will to be to others, but just started using some 
new tools to expedite in my data normalization/ cleansing/prep: 
https://www.bisok.com/data-science-workbench/


On Sunday, 20 December 2015 15:37:11 UTC-6, Matt Revelle wrote:
>
> Hey all, just chiming in that I use Clojure for exploratory analysis, 
> prototyping, and "production." Most of my work involves social networks and 
> aside from my own libs I use: core.matrix, Loom, and gg4clj (ggplot!). I'm 
> also a big fan of core.typed type annotations and Schema for data 
> validation and coercion.
>
> I used Clojure for implementing the method described in this paper: 
> Revelle, Matt, et al. "Finding Community Topics and Membership in Graphs." 
> *Machine 
> Learning and Knowledge Discovery in Databases*. Springer International 
> Publishing, 2015. 625-640.
>
> And the code is available at:
> https://github.com/gmu-dmml-lab/senc
>
> I also have a utility library that will likely become a few separate 
> libraries in the future:
> https://github.com/mattrepl/munge
>
> It has some basic IO for common formats (Matrix Market, various graph 
> formats, R tables), helper functions (some of which are no longer needed) 
> for core.matrix and Loom, and simple text processing.
>
> My biggest pain point with using Clojure is the kludgy access to decent 
> plots (nothing on the JVM comes close to ggplot) as well as missing 
> functions for probability distributions and model fitting. I've tried 
> various substitutes (or written my own), but nothing is as polished as R.
>
> -Matt
>
> On Sunday, December 20, 2015 at 1:11:12 AM UTC-5, Christopher Small wrote:
>>
>> You're quite welcome; I was happy to add your work there :-) It's always 
>> wonderful seeing folks using Clojure for scientific research. I'm happy to 
>> add similar showcasings to the list.
>>
>> I should add that I've been wanting to make it easier for folks to submit 
>> suggestions through the site, and add interactive features, but I've been a 
>> bit busy. If anyone else is interested in contributing, I'd be grateful.
>>
>> Cheers
>>
>> Chris
>>
>>
>>
>> On Sat, Dec 19, 2015 at 11:31 AM, Boris V. Schmid  
>> wrote:
>>
>>> Just noticed one of my research paper made it to the showcase :-). 
>>> Thanks for that!
>>>
>>> As for clojure resources: I have been mainly used clojure itself, and 
>>> visualization libraries, (incanter, quil and gg4clj [to make plots in R 
>>> with ggplot2, but you can use it to run any R code]), and sometimes a stray 
>>> java library for smoothing or clustering things. The inter-op with java is 
>>> often not too bad. I use light table as an IDE.
>>>
>>> Boris
>>>
>>>
>>> On Thursday, April 9, 2015 at 3:17:44 AM UTC+2, Christopher Small wrote:

 Made some updates to http://clojure-datascience.herokuapp.com/. In 
 particular, went with the tagline "Resources for the budding Clojure Data 
 Scientist." Couldn't come up with anything else sufficiently punny and 
 appropriate.

 Again; please contribute! I'll be starting a list in the about page 
 mentioning everyone who's contributed.

 Chris


 On Tuesday, April 7, 2015 at 8:24:27 PM UTC-7, Emrehan Tüzün wrote:
>
> Clojure isn't the first tool coming into mind on data science at the 
> moment but the number of useful libraries are growing up. You can check 
> out 
> https://github.com/razum2um/awesome-clojure#science-and-data-analysis.

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Re: clojars down?

2016-01-01 Thread Brad Koch 
Anyone know if there are any mirrors available that we can use in the time 
being?

Our production deploys are broken right now because lein won't be able to 
fetch the dependencies during build.  We can't tolerate the risk of not 
being able to make new deployments for an extended period of time, and a 
mirror we could point to would be the easiest way to get builds working 
again for now.

On Friday, January 1, 2016 at 2:00:40 PM UTC-5, Nicolás Berger wrote:
>
> Clojars is down because of the ongoing DDoS attacks on linode. Please 
> check http://status.linode.com/ for status on that
> El 1 ene. 2016 15:53, "Angel Java Lopez"  
> escribió:
>
>> It's down here... chrome, page not available, from Buenos Aires, Argentina
>>
>> On Fri, Jan 1, 2016 at 3:51 PM, Mimmo Cosenza > > wrote:
>>
>>> it’s down here too. 
>>>
>>> http://status.linode.com/
>>>
>>> mimmo
>>>
>>> On 01 Jan 2016, at 19:49, Bobby Eickhoff >> > wrote:
>>>
>>> Is anyone else having trouble connecting to clojars.org?  Firefox can't 
>>> connect: "The connection has timed out".  Neither can lein:
>>>
>>> INFO: I/O exception (java.net.NoRouteToHostException) caught when 
>>> processing request to {s}->https://clojars.org:443: No route to host
>>>
>>>
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Re: Count vowels in a string

2014-05-22 Thread Brad Kurtz 
keep is cool, thanks for showing me that :)

On Wednesday, May 21, 2014 2:35:50 AM UTC-5, Vesa Marttila wrote:

 On Wednesday, May 21, 2014 2:03:14 AM UTC+3, Brad Kurtz wrote:

 I saw a rant online about interviewing developers that mentioned 
 candidates not being able to count the number of vowels in a string. So 
 naturally, I decided to see if I could do it in Clojure!

 I wanted to see others' opinions on other ways of doing it.

 *https://gist.github.com/bradkurtz/6ce500d0361ccdc08c8e 
 https://gist.github.com/bradkurtz/6ce500d0361ccdc08c8e*


 Hi,

 I ended up with this: https://gist.github.com/ponzao/7399c08bb3b40d349289

 (def vowels
   #{\a \e \i \o \u})
  
 (defn count-vowels
   [s]

   (count (keep vowels (.toLowerCase s

 Vesa


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Count vowels in a string

2014-05-20 Thread Brad Kurtz 
I saw a rant online about interviewing developers that mentioned candidates 
not being able to count the number of vowels in a string. So naturally, I 
decided to see if I could do it in Clojure!

I wanted to see others' opinions on other ways of doing it.

*https://gist.github.com/bradkurtz/6ce500d0361ccdc08c8e*

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Re: Count vowels in a string

2014-05-20 Thread Brad Kurtz 
I like the one-liner. That was the kind of feedback I was looking for, 
thanks.

On Tuesday, May 20, 2014 6:13:48 PM UTC-5, puzzler wrote:

 You're seriously overthinking this if it's any more than a one-liner.

 (defn count-vowels [s] (count (filter #{\a \e \i \o \u \A \E \I \O \U} 
 (seq s


 On Tue, May 20, 2014 at 4:03 PM, Brad Kurtz bkurt...@gmail.comjavascript:
  wrote:

 I saw a rant online about interviewing developers that mentioned 
 candidates not being able to count the number of vowels in a string. So 
 naturally, I decided to see if I could do it in Clojure!

 I wanted to see others' opinions on other ways of doing it.

 *https://gist.github.com/bradkurtz/6ce500d0361ccdc08c8e 
 https://gist.github.com/bradkurtz/6ce500d0361ccdc08c8e*
  
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Re: Looking for help with a Stack Overflow error

2014-05-18 Thread Brad Kurtz 
I've seen David Nolen talk a bit about core.logic and I admit it seems 
interesting. Since I'm new to Clojure I didn't think to look into it. I'll 
take a look at your solution Leif. Thanks for the suggestions everyone.

On Sunday, May 18, 2014 6:28:15 PM UTC-5, Leif wrote:

 Hi, Brad (and Karsten).

 I solved the problem with core.logic, to try out its CLP(FD) features.  It 
 took about 220-230ms to find a solution.  It took about 400ms to find all 
 solutions.

 Here it is for you to peek at after you try it:
 https://gist.github.com/leifp/b4af5f4cd7289c38b55a

 The code looked very similar to the problem statement, no careful 
 hand-crafting required.  The one minor irritation is that there is no way 
 to easily specify equations involving vectors of logic vars.  I think I 
 could've done it in this case with macros, but I wouldn't want to do that 
 if I had hundreds or thousands of variables.  Maybe I'm just not 
 experienced enough with core.logic, experts chime in if so.

 --Leif

 On Friday, May 16, 2014 3:31:26 PM UTC-4, Brad Kurtz wrote:

 I'm pretty new to Clojure so I'm trying out simple examples to see if I 
 can get myself in the functional programming/Lisp mindset. My team lead 
 sends out puzzles from his Mensa calendar, and every once in a while I find 
 one that seems fun to solve as a Clojure program.

 With this particular puzzle, I've tried a couple of different ways of 
 solving the puzzle, and I decided to try a recursive function. I'm fairly 
 certain that what I've done here is not anywhere near ideal, and I'm 
 looking for insight into how to better write this solution.

 Also, with my latest attempt I seem to be getting a stack overflow error, 
 and I'm not quite sure why. I'm pretty sure it has to do with the 
 permutation sequence (it's basically 10 factorial, or around 3 million 
 sequences), but I don't really know how to better represent this problem in 
 Clojure. Can anyone help? Thanks!

 https://github.com/bradkurtz/clojure-puzzles/tree/master/billiards



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Looking for help with a Stack Overflow error

2014-05-16 Thread Brad Kurtz 
I'm pretty new to Clojure so I'm trying out simple examples to see if I can 
get myself in the functional programming/Lisp mindset. My team lead sends 
out puzzles from his Mensa calendar, and every once in a while I find one 
that seems fun to solve as a Clojure program.

With this particular puzzle, I've tried a couple of different ways of 
solving the puzzle, and I decided to try a recursive function. I'm fairly 
certain that what I've done here is not anywhere near ideal, and I'm 
looking for insight into how to better write this solution.

Also, with my latest attempt I seem to be getting a stack overflow error, 
and I'm not quite sure why. I'm pretty sure it has to do with the 
permutation sequence (it's basically 10 factorial, or around 3 million 
sequences), but I don't really know how to better represent this problem in 
Clojure. Can anyone help? Thanks!

https://github.com/bradkurtz/clojure-puzzles/tree/master/billiards

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Re: Looking for help with a Stack Overflow error

2014-05-16 Thread Brad Kurtz 
I have since fixed the original stack overflow error I was getting, it was 
a result of not using recur. However, I'm still trying to find the best 
way to actually iterate through the permutations to find the result...

On Friday, May 16, 2014 2:31:26 PM UTC-5, Brad Kurtz wrote:

 I'm pretty new to Clojure so I'm trying out simple examples to see if I 
 can get myself in the functional programming/Lisp mindset. My team lead 
 sends out puzzles from his Mensa calendar, and every once in a while I find 
 one that seems fun to solve as a Clojure program.

 With this particular puzzle, I've tried a couple of different ways of 
 solving the puzzle, and I decided to try a recursive function. I'm fairly 
 certain that what I've done here is not anywhere near ideal, and I'm 
 looking for insight into how to better write this solution.

 Also, with my latest attempt I seem to be getting a stack overflow error, 
 and I'm not quite sure why. I'm pretty sure it has to do with the 
 permutation sequence (it's basically 10 factorial, or around 3 million 
 sequences), but I don't really know how to better represent this problem in 
 Clojure. Can anyone help? Thanks!

 https://github.com/bradkurtz/clojure-puzzles/tree/master/billiards


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Monitoring a Clojure app, possibly with New Relic

2013-12-13 Thread Brad Koch 
I need to implement some performance monitoring and exception tracking for 
my Clojure app.  My first thought was to just use New Relic.  I implemented 
it according to Heroku's New Relic instructions for 
Clojurehttps://devcenter.heroku.com/articles/newrelic#clojure-configuration. 
 It initialized the dashboard successfully, but no data is ever sent.  I've 
seen two other https://groups.google.com/forum/#!topic/clojure/mfwIvW1KZAM 
reports http://stackoverflow.com/q/13420912/425313 of no data being 
received as well.  The logs note the capture of things such as SQL queries, 
but the agent doesn't seem to send them in the report back.

I filed a ticket with them, but their customer support has been awful; they 
responded only once a week ago and have ignored requests for updates.

Has anyone had this issue with New Relic on a Clojure app, and did you find 
a way to resolve it?  Does anyone use something different for monitoring 
that works well?

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How to go about 'proving' why dynamically typed languages are better

2013-10-06 Thread Brad Bowman 

 zcaudate z...@caudate.me Oct 05 08:35PM -0700

I'm a little bit miffed over this current craze of `types` and
`correctness` of programs. It smells to me of the whole `object` craze of
the last two decades. I agree that types (like objects) have their uses,
especially in very well defined problems, but they have got me in trouble
over and over again when I am working in an area where the goal is unclear
and requirements are constantly changing.


Joe Armstrong and Simon Peyton Jones discuss Erlang and Haskell
http://www.infoq.com/interviews/armstrong-peyton-jones-erlang-haskell

This interview covers some of the strong-types vs flexible development
(apparent) dichotomy, but in a playful, open and non-dogmatic way. (catmatic?)

Simon Peyton Jones is one of the Haskell leaders, yet admits to
being envious of type-free generics.  Joe Armstrong of Erlang fame
also sees the benefit to thinking in and annotating types.
These two are both leaders of typed or dynamic cults but have
a pleasant friendly and frank conversation about the issues.
(Erlang's Dialyzer sounds somewhat like core.typed)

A sample:

SPJ: So, I've told you what I most envy about Erlang. What do you most envy 
about Haskell?


JA: All the types. I mean they're very nice. I wish we had them. On the other 
hand, wouldn't you love to have all these generic turn-to-binary, these sort 
of things? How can you live without them?


SPJ: I have a little bit of residual envy about generics.

JA: You just take anything and compare it to the serializer and then send it?

SPJ: That's sinfully easy, and shouldn't be allowed.


So if these two can agree that there's strengths and weaknesses in both
approaches, that settles it for me.  It's a matter of knowing your
trade-offs and choosing your tools appropriately.

My suspicion is that type affinity is related to some trait of personality,
and so trying to prove superiority is a likely to work as proving you
are right in any other clash of personalities.

Brad

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Re: What people want from Clojure error messages

2013-01-24 Thread brad bowman 
On Friday, January 25, 2013 6:27:48 AM UTC+11, Michael Klishin wrote:
[..] 

 Because poor error messages primarily trip newcomers to the language,
 I am a bit surprised to see this issue discussed on the closed
 mailing list said beginners cannot join [quickly or at all].

 So, if you have something specific to say on the topic, say it here.


As a Clojure beginner with no Java experience, I find the error messages to 
often
be very Java-centric, usually needing my best-guess interpretation into the
Clojure in front of me (nil and NullPointer being the only specific I can 
recall right now).
I'll collect any more I come across, especially since I'm sure I can 
generate weirder,
why would you even type that? code than people who have already learned 
Clojure.
It looks like the Java-ness was touched on in the clojure-dev discussion 
also.

When Perl, after 15 or so years, finally included the variable name in 
uninitialized
warnings it was truly a blessed day.  Perl also has a use diagnositics 
pragma that
nicely decrypts and decorates error messages:
  perl -Mdiagnostics -Mstrict -E 'my $x; print $x'
This opt-in feature is newbie-friendly without burdening more experienced 
users.

Brad

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Re: A tutorial for how to setup your clojure development environment for: Emacs, Leiningen and Linux.

2012-06-22 Thread brad bowman 
On Thursday, June 21, 2012 12:58:19 PM UTC+10, John Gabriele wrote:

 On Jun 18, 10:23 pm, Chris Zheng zcaud...@gmail.com wrote: 
  {snip} 
  So basically, if a 'lead clojure evangelist' can either 'officially' or 
  'unofficially' recommend ONE emacs setup, along with a bunch of 
  videos/tutorials that demonstrate how to code and how fast it is to 
 design 
  and code using the repl. Then that be enough to get people at least 
  interested. 

 People are very opinionated about their editor/IDE. I think the Getting 
 +Started docs are good --- they separate: 

   * if you want just Emacs plus the repl, here you go (clojure-mode 
 readme) 
   * if you want Emacs + inferior-lisp, do this (this doc needs work) 
   * if you want Emacs + swank/slime, do this (swank-clojure readme) 

 and of course also info on Eclipse, Clooj, and other editors/ide's as 
 well. 


I'm right at the start of this process, completely unfamiliar with Clojure,
Leiningen, Emacs, Java and all of the projects with cute names.
I don't even know what I want.

I've cut and pasted various git-clone and lein commands, but have no idea
about the bigger picture.  I'm happy to dawdle along on my own, but if my
current (and hopefully temporary) ignorance can provide feedback on a
start-up guide then let me know.

At present I'm often wondering what is this thing? why do I want it?.
Slime for example.  I don't especially want answers here, but something like
a glossary for the clojure ecosystem would be handy (not that I've looked 
hard).

Another document that might useful is a platform Rosetta stone
matching clojure tools and libraries to those that fill a similar role in 
other
languages (Java and Ruby for starters).  This is more of a nice to have.

Thanks,

Brad

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Re: Alan Kay talk

2012-04-24 Thread Brad Lucas 
The link Tim provided is the direct link but it doesn't 'work' unless 
you are already on the site.


I had the same problem.

Try going to the main page for the video here 
http://tele-task.de/archive/lecture/overview/5819/


There is a group of links of which one of is the flash link which will 
then 'work'. Try http://tele-task.de/archive/video/flash/14029/


- Brad

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PersistentHashMap vs PersistentArrayMap in Postal Question

2012-03-04 Thread Brad Lucas 
I'm using Postal (https://github.com/drewr/postal) and found something
I don't know how to fix.

I have my application working fine if I have a var with my smtp
properties created as follows:

(def smtp-original {:host foo.com
  :port 2525
  :user me
  :pass pwd
  })

Since I want to release my project for others I thought to modify it
to read the smtp values from a Properties file. I used the routine
from Dave Ray's answer on StackOverFlow (http://stackoverflow.com/a/
7781443/406220).

;; Load smtp information out of a file from 
http://stackoverflow.com/a/7781443/406220
(defn load-props
  [file-name]
  (with-open [^java.io.Reader reader (clojure.java.io/reader file-
name)]
(let [props (java.util.Properties.)]
  (.load props reader)
  (into {} (for [[k v] props] [(keyword k) (read-string v)])

This works well in that it returns a Map that looks just like the smtp-
original when reading the following file.

host=foo.com
port=2525
user=me
pass=pwd


The trouble is when I run my app and it calls into Postal I get a
java.lang.ClassCastException.

I notice that the smtp-original created with a def is a
clojure.lang.PersistentHashMap while the return from load-props is a
clojure.lang.PersistentArrayMap.

I looked into Postal but don't see why this matters.

So, I guess I have a few questions.

Can I convert the PersistentArrayMap to a PersistentHashMap? Is this
the right way to go?
Is load-props doing something unusual? It seems fine.
Does anyone understand the internals of Postal? Why would it not work
with the PersistentArrayMap?

Any ideas or pointers would be greatly appreciated. I'm looking to
understand what is going on.

Thanks

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Re: PersistentHashMap vs PersistentArrayMap in Postal Question

2012-03-04 Thread Brad Lucas 
That did the trick. Thanks.

Oh and I'll be careful on StackOverflow :)

- Brad


On Mar 4, 12:51 pm, Dave Ray dave...@gmail.com wrote:
 Brad,

 As Kevin points out, because the values in the property file go
 through read-string, they're read as Clojure literals, symbols in this
 case. One solution is to make the string values look like string
 literals to the reader:

 host=foo.com
 port=2525
 user=me
 pass=pwd

 Try that and never believe anything you read on StackOverflow :)

 Dave







 On Sun, Mar 4, 2012 at 10:23 AM, Brad Lucas b...@beaconhill.com wrote:
  I'm using Postal (https://github.com/drewr/postal) and found something
  I don't know how to fix.

  I have my application working fine if I have a var with my smtp
  properties created as follows:

  (def smtp-original {:host foo.com
                       :port 2525
                       :user me
                       :pass pwd
                       })

  Since I want to release my project for others I thought to modify it
  to read the smtp values from a Properties file. I used the routine
  from Dave Ray's answer on StackOverFlow (http://stackoverflow.com/a/
  7781443/406220).

  ;; Load smtp information out of a file 
  fromhttp://stackoverflow.com/a/7781443/406220
  (defn load-props
   [file-name]
   (with-open [^java.io.Reader reader (clojure.java.io/reader file-
  name)]
     (let [props (java.util.Properties.)]
       (.load props reader)
       (into {} (for [[k v] props] [(keyword k) (read-string v)])

  This works well in that it returns a Map that looks just like the smtp-
  original when reading the following file.

  host=foo.com
  port=2525
  user=me
  pass=pwd

  The trouble is when I run my app and it calls into Postal I get a
  java.lang.ClassCastException.

  I notice that the smtp-original created with a def is a
  clojure.lang.PersistentHashMap while the return from load-props is a
  clojure.lang.PersistentArrayMap.

  I looked into Postal but don't see why this matters.

  So, I guess I have a few questions.

  Can I convert the PersistentArrayMap to a PersistentHashMap? Is this
  the right way to go?
  Is load-props doing something unusual? It seems fine.
  Does anyone understand the internals of Postal? Why would it not work
  with the PersistentArrayMap?

  Any ideas or pointers would be greatly appreciated. I'm looking to
  understand what is going on.

  Thanks

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ANN: quote-downloader 1.0.0

2012-02-26 Thread Brad Lucas 
Yahoo provides downloadable historical quote data if you exercise a
properly formatted URL. The data is returned in CSV format and is
easily stored in a file. I wrote quote-downloader to accept stock
symbols from the command line and request and store the data in
symbol.csv files locally.

The program demonstrates reading from the command line, building a
unique URL and reading from it as well as saving the results to a file
and

The code is on github here
https://github.com/bradlucas/quote-downloader

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Re: clj-time and clojure 1.3

2011-11-20 Thread Brad 
Thanks. It would be nice if KirinDave id put a notice up. Also, it
would be nice if when you search for clj-time and go to getwoven
rather than 404-ing it pointed to your version.

I have an idea.

I notice that you have a pointer to Clojars under Installation. This
seems like a nice standard for people to follow. You find the source
of something which you try quickly this way.

I think the reverse would be nice. If you find clj-time for example by
going to Clojars first it would be nice if there was a pointer back to
the source that was used to build the jar submitted to Clojars.

- Brad


On Nov 17, 12:48 pm, Sean Corfield seancorfi...@gmail.com wrote:
 On Wed, Nov 16, 2011 at 5:39 PM, Sean Corfield seancorfi...@gmail.com wrote:
  I have taken over clj-time from Mark McGranahan:

 https://github.com/seancorfield/clj-time

  (although github seems to be omitting the navigation bar on that repo
  - I'll open a support ticket).

 github fixed that problem - apparently it was a weird caching issue...

 Now if we can get KirinDave to put a notice on his repo saying mine's
 the master, given that in the absence of the getwoven repo, github now
 says mine's a clone of his, rather than the getwoven one...
 --
 Sean A Corfield -- (904) 302-SEAN
 An Architect's View --http://corfield.org/
 World Singles, LLC. --http://worldsingles.com/

 Perfection is the enemy of the good.
 -- Gustave Flaubert, French realist novelist (1821-1880)

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clj-time and clojure 1.3

2011-11-16 Thread Brad 
Just curious what happened with getwoven and clj-time.

It seems that Sean has updated clj-time over on Clojars and this
version works fine under 1.3.

If you search on clj-time though you get links to a getwoven project.
https://github.com/getwoven/clj-time/ with 404s. This is the one I
originally used. Now when I search github I see 
https://github.com/KirinDave/clj-time.

Just wondering what is happening and where the appropriate project is?

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where is defvar?

2011-11-14 Thread Brad 
I'm working on moving to Clojure 1.3

Some code is using defvar which use to be in clojure.contrib.def

http://dev.clojure.org/display/design/Where+Did+Clojure.Contrib+Go
mentions that contrib.def partially migrated to clojure.core.incubator
but this new library doesn't  appear to have it.

Is there somewhere else I should look?




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Re: where is defvar?

2011-11-14 Thread Brad 
Thanks. I couldn't find this mentioned anywhere so I added a comment
on clojuredocs

http://clojuredocs.org/clojure_contrib/clojure.contrib.def/defvar



On Nov 14, 7:26 pm, Alan Malloy a...@malloys.org wrote:
 (def name doc init)

 On Nov 14, 4:03 pm, Brad b...@beaconhill.com wrote:







  I'm working on moving to Clojure 1.3

  Some code is using defvar which use to be in clojure.contrib.def

 http://dev.clojure.org/display/design/Where+Did+Clojure.Contrib+Go
  mentions that contrib.def partially migrated to clojure.core.incubator
  but this new library doesn't  appear to have it.

  Is there somewhere else I should look?

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extend already refers to: #'clj-time.core/extend in namespace

2011-09-08 Thread Brad 
I started using the clj-time library and found that it works great.
Only issue I don't understand is this one about extend already refers
to another version of extend.

It seems that clj-time has a function called extend that conflicts
with the same named function in clojure.core.

The recommendation online is to put (:refer-clojure :exclude [extend])
in your ns declaration. I've done this.

My core.clj file looks like the following:

(ns test.core
  test project
  (:refer-clojure :exclude (extend))
  (:use clj-time.core))

(defn foo
  []
  (print asdf))

It sounded like doing this would inside my project use the extend
inside of clj-time.core rather than the clojure one.

The following two scenarios happen and don't make sense to me.

The first is I slime-connect to a new swank session. The repl is in
user. I open my test/core.clj file and compile it. When I return to
the repl and (ns test.core) I get a sldb trace which I need to quit.
It has the following complaint:

extend already refers to: #'clj-time.core/extend in namespace:
test.core

The second is a variation where I start a new swank session and in the
repl change the name space to test.core (ns test.core). Then I open
test/core.clj and compile it. This time I just a warning printed to
the REPL as follows:

WARNING: extend already refers to: #'clojure.core/extend in namespace:
test.core, being replaced by: #'clj-time.core/extend

Can anyone explain what is going on here. I don't quite get it.

- Brad


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Re: extend already refers to: #'clj-time.core/extend in namespace

2011-09-08 Thread Brad 
Btw, I'm using

clojure-1.2.0.jar
clj-time-0.3.0.jar

- Brad

On Sep 8, 5:03 pm, Brad b...@beaconhill.com wrote:
 I started using the clj-time library and found that it works great.
 Only issue I don't understand is this one about extend already refers
 to another version of extend.

 It seems that clj-time has a function called extend that conflicts
 with the same named function in clojure.core.

 The recommendation online is to put (:refer-clojure :exclude [extend])
 in your ns declaration. I've done this.

 My core.clj file looks like the following:

 (ns test.core
   test project
   (:refer-clojure :exclude (extend))
   (:use clj-time.core))

 (defn foo
   []
   (print asdf))

 It sounded like doing this would inside my project use the extend
 inside of clj-time.core rather than the clojure one.

 The following two scenarios happen and don't make sense to me.

 The first is I slime-connect to a new swank session. The repl is in
 user. I open my test/core.clj file and compile it. When I return to
 the repl and (ns test.core) I get a sldb trace which I need to quit.
 It has the following complaint:

 extend already refers to: #'clj-time.core/extend in namespace:
 test.core

 The second is a variation where I start a new swank session and in the
 repl change the name space to test.core (ns test.core). Then I open
 test/core.clj and compile it. This time I just a warning printed to
 the REPL as follows:

 WARNING: extend already refers to: #'clojure.core/extend in namespace:
 test.core, being replaced by: #'clj-time.core/extend

 Can anyone explain what is going on here. I don't quite get it.

 - Brad

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Re: Convert Map to string for use in URL as parameters question

2011-08-02 Thread Brad 
Thanks. This is much more succinct.


On Aug 2, 12:19 am, Sean Corfield seancorfi...@gmail.com wrote:
 On Mon, Aug 1, 2011 at 3:47 PM, Brad b...@beaconhill.com wrote:
  ;; My test input map
  (def input {:a 1 :b 2 :c 3 :d 4})
 ...
  Is there a simpler, better way to do this?

 How about:

 (require '[clojure.string :as str])

 (defn map-to-query-string [m]
   (str/join  (map (fn [[k v]] (str (name k) = v)) m)))
 --
 Sean A Corfield -- (904) 302-SEAN
 An Architect's View --http://corfield.org/
 World Singles, LLC. --http://worldsingles.com/
 Railo Technologies, Inc. --http://www.getrailo.com/

 Perfection is the enemy of the good.
 -- Gustave Flaubert, French realist novelist (1821-1880)

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Re: Convert Map to string for use in URL as parameters question

2011-08-02 Thread Brad 
Great. Encoding the parameters was the next thing to figure out.
Thank you.

On Aug 2, 12:51 am, Matjaz Gregoric gre...@gmail.com wrote:
 Depending on your input, you might also want to make sure to properly
 urlencode the keys and values.
 There is a function in hiccup that does what you want (including
 urlencoding):

 https://github.com/weavejester/hiccup/blob/10c3ebe175edc80eed1a0792ec...

 On Tue, Aug 2, 2011 at 12:47 AM, Brad b...@beaconhill.com wrote:
  I wanted to take a Map and convert it to a string suitable for use as
  parameters in a URL. I have got it working below two different ways
  but wondered if there was a better or more idiomatic way to do this.

  ;; My test input map
  (def input {:a 1 :b 2 :c 3 :d 4})

  ;; What I'd like the input map convert into. A string that looks like
  keyword=valuekeyword=value, 
  (def output a=1b=2c=3d=4)

  ;; This function converts each MapEntry to the key=value
  (defn map-entry-to-string-pair
   Convert a key value from a map into a string that looks like
  key=value.
  For example,
     (def input {:a 1 :b 2 :c 3 :d 4})
     (map-entry-to-string-pair (first input)) = \a=1\
   [mapentry]
   (str (name (first mapentry)) = (second mapentry)))

  ;; The following two functions build the result string. There is not
  much of a difference between them. The first uses
  ;; let to hold a variable after mapping map-entry-to-string-pair over
  the input map. The other just uses the same mapping
  ;; after converting it to a vector.

  (defn convert-map-to-url-string1
   Convert a map from keyword values to a string that consists of
  keyword=value pairs separated by s for use in a URL
  For example,
     (def input {:a 1 :b 2 :c 3 :d 4})
     (convert-map-to-url-string1 input) = \a=1b=2c=3d=4\
   [m]
   (let [pairs (map map-entry-to-string-pair m)]
     (join  pairs)))

  (defn convert-map-to-url-string2
   Convert a map from keyword values to a string that consists of
  keyword=value pairs separated by s for use in a URL
  For example,
     (def input {:a 1 :b 2 :c 3 :d 4})
     (convert-map-to-url-string2 input) = \a=1b=2c=3d=4\
   [m]
   (join  (vec (map map-entry-to-string-pair m

  Is there a simpler, better way to do this?

  - Brad

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Convert Map to string for use in URL as parameters question

2011-08-01 Thread Brad 
I wanted to take a Map and convert it to a string suitable for use as
parameters in a URL. I have got it working below two different ways
but wondered if there was a better or more idiomatic way to do this.

;; My test input map
(def input {:a 1 :b 2 :c 3 :d 4})

;; What I'd like the input map convert into. A string that looks like
keyword=valuekeyword=value, 
(def output a=1b=2c=3d=4)

;; This function converts each MapEntry to the key=value
(defn map-entry-to-string-pair
  Convert a key value from a map into a string that looks like
key=value.
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(map-entry-to-string-pair (first input)) = \a=1\
  [mapentry]
  (str (name (first mapentry)) = (second mapentry)))


;; The following two functions build the result string. There is not
much of a difference between them. The first uses
;; let to hold a variable after mapping map-entry-to-string-pair over
the input map. The other just uses the same mapping
;; after converting it to a vector.

(defn convert-map-to-url-string1
  Convert a map from keyword values to a string that consists of
keyword=value pairs separated by s for use in a URL
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(convert-map-to-url-string1 input) = \a=1b=2c=3d=4\
  [m]
  (let [pairs (map map-entry-to-string-pair m)]
(join  pairs)))

(defn convert-map-to-url-string2
  Convert a map from keyword values to a string that consists of
keyword=value pairs separated by s for use in a URL
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(convert-map-to-url-string2 input) = \a=1b=2c=3d=4\
  [m]
  (join  (vec (map map-entry-to-string-pair m


Is there a simpler, better way to do this?

- Brad

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Re: Pure-functional N-body benchmark implementation

2009-08-18 Thread Brad Beveridge 





On 2009-08-17, at 8:58 PM, FFT fft1...@gmail.com wrote:

 On Mon, Aug 17, 2009 at 9:25 AM, Bradbevbrad.beveri...@gmail.com  
 wrote:

 On Aug 17, 1:32 am, Nicolas Oury nicolas.o...@gmail.com wrote:
 I was referring to the rules of the benchmark game. When you  
 benchmark
 language, using another language is not fair.

 If you were to do your own program, of course you could use Java.
 However, in the particular circumstance, it is a bit annoying to use
 Java just to create a data structure type.

 Ah, that makes more sense re the cheating then.  Your insight for
 array range check elimination got me thinking - why can't the  
 accessor
 macros (posx, etc) that use aset/aget have their ranges eliminated by
 the JVM?  After all, it should be a simple constant fold.  I found
 another 2-3x speed up by coercing the indexes with (int x), ie
 (defmacro mass [p] `(double (aget ~p (int 0

 I'm not seeing this. Maybe you are running this on -client?
I'm running Java 1.5 32bit on OS X 10.5 with -server.

 I don't have the Java version running on my machine, but I saw
 runtimes go from 833ms to 295ms for 10 iterations, a 2.8x speed
 up, which should put the no cheating version on the same standing  
 as
 the Java implementation.

 You can't get a consistent timing for anything less than 1-10M  
 iterations here.
Why do you think that?  Everything I've read says that hotspot kicks  
in at 10,000, and I always do a warmup run.
I see consistent enough timings, within 50ms each run. When coerced  
ints gives an immediate 3x speedup something is happening. What JVM  
are you running  what settings?  I'll compile the java version soon  
so I can do a direct compare on a single machine. I take it that your  
setup is showing clojure 3x slower than the java version?

Brad

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