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03:50 PLT_Notify: racket: master Eli Barzilay * f0d1b6b (7 files in 4 dirs): New Racket version 5.1.0.6. - http://bit.ly/dZHtRK
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06:01 Eren`: how can I get the binary representation of a number?
06:02 Eren`: what I am doing is to return Boolean if the given number is a power of 2, without using any arithmetic operation
06:03 Eren`: it's just a left-shift operation to multiply a number by 2, so I will control if the number has only one "1" in it
06:03 Eren`: but I couldn't find a binary representation of a number in racket :)
06:09 Eren`: ok, "bitwise-bit-count" does the work, it counts a number of 1s in the number
06:10 Eren`: however, I get procedure is not defined error
06:10 Eren`: although it is documented in the website
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07:36 eli: Eren`: That depends on what you mean by "get the binary representation".
07:37 eli: (Since numbers are already represented in binary form.)
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08:32 Eren`: eli: I mean, in python you can see binary representation with "bin(6)"
08:32 Eren`: I was referring to a function like "bin()" in python
08:38 DT``: Eren`, (format "~B") (or printf), or (string->number number 2)
08:39 eli: Eren`: That's not a "binary representation" -- that's a base-2 ASCII representation.
08:39 eli: And yes -- what DT`` said.
08:39 eli: rudybot: (format "~b" 6)
08:39 rudybot: eli: your sandbox is ready
08:39 rudybot: eli: ; Value: "110"
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09:25 Eren`: thank you
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10:33 tauntaun: A bit of confusion may be caused by a typo in http://docs.racket-lang.org/reference/threads.html?q=mailbox&q=thread-receive#%28part._threadmbox%29
10:33 rudybot: http://tinyurl.com/3zvy3ll
10:34 tauntaun: The first sentence should read either "can receive an arbitrary message" or "can receive arbitrary messages."
10:34 tauntaun: Which leads to the question: how many messages can a thread's mailbox hold?
10:48 eli: rudybot: (define t (thread (lambda () (sync (make-semaphore 0))))) (for ([i (in-range 100000)]) (thread-send t i))
10:48 rudybot: eli: why not use in-range directly?
10:48 eli: rudybot: eval (define t (thread (lambda () (sync (make-semaphore 0))))) (for ([i (in-range 100000)]) (thread-send t i))
10:48 rudybot: eli: Done.
10:48 eli: rudybot: eval (define t (thread (lambda () (sync (make-semaphore 0))))) (for ([i (in-range 1000000)]) (thread-send t i))
10:48 rudybot: eli: Done.
10:48 eli: rudybot: eval (define t (thread (lambda () (sync (make-semaphore 0))))) (for ([i (in-range 10000000)]) (thread-send t i))
10:48 rudybot: eli: error: evaluator: terminated (out-of-memory)
10:49 eli: tauntaun: ^
10:49 offby1: .oO("why not use in-range directly?" .... heh)
10:50 eli: Yeah, that auto-guessing-when-you-should-eval can be confusing when combined with come-up-with-a-reasonable-looking-random-nonsense.
10:52 eli: tauntaun: fixed.
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10:52 PLT_Notify: racket: master Eli Barzilay * 000e52d (1 files in 1 dirs): Minor but potentially confusing typo - http://bit.ly/hT9yAr
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11:10 tauntaun: Thread mailboxes appear to lose messages when the thread sleeps for more than about 1 second.  Why? (Am I missing something obvious?)
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12:46 PLT_Notify: racket: master Ryan Culpepper * 0bec757 (2 files in 1 dirs): syntax/parse: fixed bug in ~literal uncovered by litset changes
12:46 PLT_Notify: racket: master Ryan Culpepper * a19a034 (1 files in 1 dirs): added ffi/unsafe/security
12:46 PLT_Notify: racket: master Ryan Culpepper * 73ab167 (46 files in 25 dirs): created racket/syntax from parts of unstable/syntax
12:46 PLT_Notify: racket: master Ryan Culpepper * 86f6546 (3 files in 3 dirs): removed define-pattern-variable
12:46 PLT_Notify: racket: master Ryan Culpepper * 76c75d5 (2 files in 2 dirs): added stx-map to syntax/stx from unstable/syntax
12:46 PLT_Notify: racket: master Ryan Culpepper * 3e5a54c (3 files in 3 dirs): unstable/syntax: removed unused code and exports
12:46 PLT_Notify: racket: master Ryan Culpepper * eb60d3d (1 files in 1 dirs): fixed bug in expansion of (this-package-in main)
12:46 PLT_Notify: racket: master Ryan Culpepper * ae8d945 (1 files in 1 dirs): added line breaks
12:46 PLT_Notify: racket: master commits 000e52d...ae8d945 - http://bit.ly/h8Fq0c
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12:51 PLT_Notify: racket: master Stephen Chang * 9f84886 (3 files in 3 dirs): fix lazy stepper to work with print and write output-styles ... - http://bit.ly/efwC1H
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14:49 PLT_Notify: racket: master Casey Klein * 143e1e6 (3 files in 2 dirs): Improves error for references to not-yet-defined metafunctions ...
14:49 PLT_Notify: racket: master Casey Klein * 989103c (2 files in 2 dirs): Improves term-let's "too few ellipses" error ...
14:49 PLT_Notify: racket: master commits 9f84886...989103c - http://bit.ly/glBMHG
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15:11 PLT_Notify: racket: master Stephen Chang * 5238c33 (3 files in 2 dirs): fix stepper tests broken by lazy stepper - http://bit.ly/gtlIzG
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17:21 tauntaun: Consider a thread that echoes what it receives in its mailbox:
17:21 tauntaun: (define t
17:21 tauntaun: (thread (lambda ()
17:21 tauntaun: 	    (let loop ()
17:21 tauntaun: 	      (if (thread-try-receive)
17:21 tauntaun: 		  (printf "I heard: ~a\n" (thread-receive))
17:21 tauntaun: 		  (sleep 2))
17:21 tauntaun: 	      (flush-output)
17:21 tauntaun: 	      (loop)))))
17:22 tauntaun: Why does the following not print a, then b, then c?
17:22 tauntaun: (thread-send t 'a)
17:22 tauntaun: (thread-send t 'b)
17:22 tauntaun: (thread-send t 'c)
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17:34 stamourv: I don't think there are any ordering guarantees on thread mailboxes
17:45 tauntaun: stamourv: Are you sure about this?  I should also be more clear about what the code does: the problem is not that a, b, c get printed out of order, but that two of the sent messages somehow get dropped altogether.
17:46 stamourv: tauntaun: no, I'm not sure about this
17:46 stamourv: I briefly looked at the docs, and they didn't mention ordering
17:46 tauntaun: What about thread-rewind-receive?
17:48 stamourv: good point
17:49 stamourv: and you say two of the messages are dropped?
17:49 tauntaun: Yes.
17:49 tauntaun: Usually I just get "I heard: b"
17:51 stamourv: got it
17:51 stamourv: thread-try-receive consumes the 'a message
17:51 stamourv: then thread-receive consumes and prints the 'b message
17:51 tauntaun: Doh!
17:52 tauntaun: Sorry.
17:52 stamourv: no problem
17:52 tauntaun: Thanks for restoring my sanity...
17:52 stamourv: was a pleasure
17:59 lithpr: i'm not a student, but i'm working my way though HTDP.. i am a little stumped by:
17:59 lithpr: Define the program convert3. It consumes three digits, starting with the least significant digit,
17:59 lithpr: followed by the next most significant one, and so on. The program produces the corresponding number. For example, the expected value of (convert3 1 2 3)
17:59 lithpr: 
17:59 lithpr: 
17:59 lithpr: sorry
17:59 lithpr: i was trying not to flood
18:00 lithpr: this is easily done with a string append operation, but it says there is some algebra that can be used to solve it
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18:01 lithpr: anyone have any hints?
18:02 bremner: isn't this just the 1's digit, the 10's digit, and the 100's digit?
18:02 lithpr: yes
18:02 lithpr: DOH
18:02 bremner: "algebra" might be overstating it ;)
18:02 lithpr: nm, thank you, i get it now :)
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18:02 lithpr: i was thinking too hard :)
18:02 bremner: consider a right-module over an algebraicly complete field...
18:02 lithpr: appreaciate it bremner :)
18:03 bremner: sure
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18:48 loopole: Hi racket people
18:49 loopole: anybody could tell me how to get the first from (current-command-line-arguments)
18:50 bremner: at a guess, (car (current-command-line-arguments))
18:50 bremner: or (first (current-command-line-arguments)) in #lang racket
18:50 carleastlund: I believe it is a vector, so (first (vector->list (current-command-line-arguments))) is the most obvious way
18:50 carleastlund: (vector-ref (current-command-line-arguments) 0) would of course be much faster, but less mnemonic.
18:51 bremner: dunno, appeals to this C programmer ;)
18:55 samth: also, the first element is unlikely to be what you want, it's usually the program name
18:55 samth: you probably want the second element
18:57 loopole: (first (vector->list (current-command-line-arguments))) seamed to do it... thanks!
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19:06 carleastlund: samth, I don't think that's true in Racket, is it?
19:07 carleastlund: Checking at the REPL, the program name does not appear to be in (current-command-line-arguments).
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19:13 samth: weird
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21:14 Guest80233: hi all...i have a little example i have laid out about an issue ;m having..basically i want to have a racket file loaded as a config file..the idea was that prog-settings defines some skeletel variables and then another user created file would be loaded overtop of the skeletel config..here is a pastebin: (require "catalogd-settings.rkt")
21:15 Guest80233: (test-param #t)
21:15 (nick) Guest80233 -> rekahsoft
21:16 samth: rekahsoft, i don't see what the problem is
21:20 rekahsoft: srry just sec
21:20 rekahsoft: lol having an issue with my keyboard
21:20 rekahsoft: http://pastebin.com/50vu5NnX
21:20 rekahsoft: there is the pastebin
21:21 rekahsoft: now when i run the little program with "racket prog.rkt" it fails with an error (which i can produce if you'd like)
21:22 samth: almost certainly the problem is that you don't want to use `load'
21:23 samth: you should read this section: http://docs.racket-lang.org/guide/eval.html
21:25 rekahsoft: samth: awe...alright..knew something was up :S still a little new to racket :P
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