00:04 lewis1711: how should I check two hashtables are the same?
00:05 lewis1711: eh forget it I'll just check they return the same thing for the same keys
00:05 mithos28: lewis1711: equal?
00:06 lewis1711: mithos28: nope :(
00:06 lewis1711: http://pastebin.com/9KQrcAkT
00:06 lewis1711: I used a hash-ref for '(1 . 2) instead
00:09 mithos28: because those are not the same hashes
00:09 mithos28: your function creates a mutable one, the one from the reader is an immutable one
00:11 mithos28: asumu: The reason that that function generates gensyms, is that it needs to in case you are instantiating B with something that contains free As
00:11 mithos28: rudybot: init typed/racket
00:11 rudybot: mithos28: your typed/racket sandbox is ready
00:12 mithos28: (: e (All (B) (All (A) (A -> B))))
00:12 mithos28: rudybot: (:  e (All (B) (All (A) (A -> B))))
00:12 rudybot: mithos28: Done.
00:12 mithos28: rudybot: (define (e) (e))
00:12 rudybot: mithos28: error: #<undefined>:1:0: Type Checker: Expected a function of type (A -> B), but got a function with the wrong arity in: (lambda () (#%app e))
00:12 mithos28: rudybot: (define (e x) (e x))
00:12 rudybot: mithos28: error: Type Checker: Summary: 2 errors encountered
00:13 mithos28: rudybot: (plambda: (A) ((x : A)) (inst e A))
00:13 rudybot: mithos28: ; Value: #<procedure>
00:13 rudybot: mithos28: ; stdout: "- : (All (A) (A -> (All (g4355) (g4355 -> A)) : ((! False @ e) | (False @ e))))\n"
00:13 rudybot: mithos28: ; stderr: "Type Checker: Duplicate definition for e in: #%top-interaction\n#<undefined>:1:14: Type Checker: Cannot apply expression of type (All (B) (All (A) (A -> B))), since it is not a function type in: (#%app e x)\n"
00:14 lewis1711: why the hell does make-hash take a different format than hash
00:14 mithos28: you want make-immutable-hash probably
00:14 mithos28: rudybot: init racket
00:14 rudybot: mithos28: your sandbox is ready
00:14 mithos28: rudybot (hash 'a 2 'b 3)
00:14 mithos28: rudybot: (hash 'a 2 'b 3)
00:14 rudybot: mithos28: ; Value: #hash((b . 3) (a . 2))
00:15 asumu: mithos28: fair enough, but it could at least generate a nicer name like A4355.
00:16 mithos28: asumu: I'm gonna look at improving it to do something like that, and to use the original name if its not free in the substituted type
00:21 lewis1711: mithos28: do, looking at the guide and not reference.
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00:46 asumu: Ah, attachments. They never make it on e-mails...
00:48 lewis1711: this test driven development thing is pretty nifty
00:48 lewis1711: though it feels much less annoying in racket as I don't have to go through the trouble of subclassing things
00:49 mithos28: asumu: Its not true that if the prompts are different then the dynamic winds are different
00:49 mithos28: You can capture two different points of dynamic winds with prompt-1 being the base
00:50 mithos28: install prompt2, invoke continuation1, and then invoke continuation2
00:52 mithos28: In the current model, (2007), the dynamic winds would not be executed on invocation of continuation2
00:53 lewis1711: is there anyway to get "default values" in a hash? ie, if you hash-ref it with a key that does not exist
00:53 mithos28: rudybot: (hash-ref #hash() 'key 'default)
00:53 rudybot: mithos28: ; Value: default
00:54 lewis1711: ohhhh, right
00:54 mithos28: Does that work, or do you want the default to be part of the hash? If so you could write an impersonator or use a custom dictionary
00:56 mithos28: asumu: Do you not use gmail? It would warn you about attachments not being attached.
00:57 asumu: mithos28: I use mutt still.
00:58 asumu: Also, argh on that corner case. I should look for a test case that relies on that.
01:01 lewis1711: mithos28: that'll do the trick, I only call hash-ref in two places
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01:05 lewis1711: further stupid question - how do I unpack a list again? eg, (string-append "a" "b" "c"), but what to do if I have a list like '("a" "b" "c")
01:05 lewis1711: I know I could foldl but I am sure there was an easier way
01:05 mithos28: apply
01:05 lewis1711: that's the one
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01:12 vu3rdd: anyone here also doing the Brown University CS173 course by Shriram Krishnamurthi starting on 5th?
01:13 mithos28: vu3rdd: I will be attempting to follow it, but unoficially
01:14 mithos28: I took the version from 4 years ago, and TA'd the version 2 years ago
01:14 asumu: mithos28: you had something like this in mind? https://gist.github.com/3616831
01:14 vu3rdd: mithos28: very cool!
01:15 vu3rdd: mithos28: I am taking it. I hope I will be able to do the final project.
01:15 mithos28: asumu: That looks about right, its a little hard to follow
01:16 asumu: I might watch the videos. I'm curious how SK teaches. I've only seen him teach in workshops.
01:16 asumu: (and that wasn't PL but HtDP, which was neat)
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01:17 asumu: mithos28: hard to construct one of these that isn't hard to follow. call/cc is just bad.
01:17 asumu: I can comment it though, at least.
01:17 mithos28: yeah, Those might help
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01:19 mithos28: So the other issue is when is the abort handler triggered? If you don't have the dynamic winds there, is the abort handler supposed to be called when you invoke k2
01:23 asumu: mithos28: yeah, it should. Since k2 is aborting the continuation.
01:23 asumu: (though immediately re-installs it)
01:24 mithos28: but if the dynamic winds are there, it doesn't?
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01:26 asumu: That was Matthew's proposed semantics, I think.
01:28 asumu: It seems like basing whether the handler is run based on that is pretty unfortunate though.
01:29 asumu: Since you have no idea if a given procedure you call will install dynamic winds or not.
01:29 mithos28: I agree that was what he said in the email,  but I think its the wrong semantics
01:29 asumu: Based on the barrier issue or anything else?
01:29 asumu: I agree it won't work for continuation barriers.
01:30 mithos28: based on that it could detect dynamic winds in a continuation without triggering them
01:32 mithos28: If the model installed a dw frame right after the prompt frame with empty spurs, I think that the semantics would be better
01:33 mithos28: then the abort handler would only happen if you were really changing out the continuation below the prompt with something entirely different
01:38 asumu: In which case, the dw frame is basically tagging the prompt frame.
01:39 mithos28: but corresponds to the continuation installed past the prompt
01:40 asumu: Right, that's neat.
01:40 mithos28: so If I capture a continuation up to p1, and then invoke it where p2 is the closest prompt, then I invoke the p2 abort handler, and then install the dw frame above p2
01:46 scott_: why does (member 2 (list 1 2 3 4)) return '(2 3 4)? when does this come in handy?
01:47 asumu: rudybot: (cond [(member 2 (list 1 2 3 4)) => (lambda (lst) (map add1 lst))])
01:47 rudybot: asumu: ; Value: (3 4 5)
01:47 asumu: scott_: you can use the result instead of just having a boolean around that you can't do much with
01:48 scott_: yeah, I'm just wondering where that specific result is useful
01:48 mithos28: and you need it wrapped it a list so that (member #f '(#t #f)) doesn't return just #f
01:48 scott_: ah, good point
01:57 lewis1711 is pleasantly surprised at file reading in racket
01:59 lewis1711: file->lines *thumbsup*
02:00 mithos28: Also look at in-lines, if the file is too big to read in all at once
02:04 lewis1711: is there anything like remove but that doesn't stop at the first instance?
02:04 lewis1711: I could write my own very easily with filter
02:04 mithos28: remove*
02:06 lewis1711: rudybot: (remove* 1 '(1 2 1))
02:06 rudybot: lewis1711: your sandbox is ready
02:06 rudybot: lewis1711: error: remove*: expected argument of type <list>; given: 1
02:07 lewis1711: rudybot: (remove* '(1) '(1 2 1))
02:07 rudybot: lewis1711: ; Value: (2)
02:07 lewis1711: ohh, right
02:07 lewis1711: I actually read that in the docs but didn't click
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02:12 lewis1711: rudybot: (require racket/string)
02:12 rudybot: lewis1711: Done.
02:13 lewis1711: rudybot: string-split
02:13 rudybot: lewis1711: error: reference to an identifier before its definition: string-split in module: 'program
02:14 lewis1711: http://docs.racket-lang.org/reference/strings.html#%28part._.Additional_.String_.Functions%29 says it should be in there
02:14 rudybot: http://tinyurl.com/9hhvkn4
02:14 mithos28: rudybot: init racket
02:14 scott_: lewis1711: I believe rudybot isn't running the latest version of racket
02:14 rudybot: mithos28: your sandbox is ready
02:15 lewis1711: ohh, there's a new version
02:15 lewis1711: cool
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04:31 lewis1711: actual:     (set 'c)
04:31 lewis1711: expected:   #<set: c>
04:31 lewis1711: any idea what that means? output of rackunit test
04:31 lewis1711: oh nevermind, quoting things wrong
04:31 noelw: Context?
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04:49 lewis1711: http://pastebin.com/PPS76E3r any idea why line 124 loops over and over again and prints (set "q") ? test case on 148 shows expected behaviour. am I misunderstanding how foldl works in racket?
04:52 lewis1711: ok, so just after I post it I figure it out. I was folding with states and states never changes
04:52 lewis1711: sorry, I swear I was looking at it for ages before this
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04:55 lewis1711: actually no that doesn't really help. agh
04:59 noelw: Looks like you're not reducing the size of the list before you make the recursive call
05:00 noelw: If I was Matthias I'd tell you to write out your contracts and use the design recipe
05:00 lewis1711: reducing the size of the list? what do you mean?
05:01 noelw: In the recursive call to eclose
05:01 noelw: the states are getting any smaller
05:01 noelw: the size of the set of states, that is
05:02 lewis1711: oh right
05:02 lewis1711: because even when eclose returns the empty set
05:02 lewis1711: it's still going to continually perform set-union
05:02 lewis1711: right? or did you mean something else?
05:06 Haffe: Hmmm. Another question.
05:06 Haffe: Is there a philosophical reason that the mouse handling event inside a canvas in the racket gui is called on-event?
05:07 Haffe: It seems to me that it would be more intuitive to call it on-mouse-event or on-mouse-acitivity.
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05:45 lewis1711: noelw: just in case you were dyeing to know, I am 90% sure I have it right now :) http://pastebin.com/MwkydjPA
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06:11 noelw: Groovy
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06:58 lewis1711: http://pastebin.com/GZxsKQtH how can I check for the exception without actually triggering it and halting the interprter? 11 is my attempt
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07:13 noelw: (check-exn exn:fail? (lambda () blah blah blah))
07:14 noelw: l8rs
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11:22 MightyFoo: i just completed an euler problem which required some very precise floating point operations
11:22 MightyFoo: i got an answer which was 3e-10 out (so i *ahem* guessed at the last digit)
11:23 MightyFoo: are floating point numbers in racket less precise than their cousins in other languages
11:23 MightyFoo: (or am i just a shabby coder)?
11:23 (nick) MightyFoo -> tim-brown
11:24 ianjneu: They are machine floats.
11:25 tim-brown: that's "double float"?
11:25 tim-brown: rather than "long doubles" or any such?
11:25 ianjneu: The default is double. You have to specifically ask for single-flonums
11:25 ianjneu: I don't think the compiler does semantics changing transformations that assume associativity, like some compilers do.
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11:26 tim-brown: hmm, maybe i'm doing too many precision-lossy operations
11:26 ianjneu: Ya, we don't have a flonum linear interval analysis to tell you theoretical ranges of your bindings.
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12:19 tim-brown: night all
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14:21 Haffe: Yawn.
14:22 stamourv: Tired?
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17:42 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/p1NWjQ
17:42 RacketCommitBot: [racket/master] ffi/unsafe: change `cast' to avoid pitfalls for you - Matthew Flatt
17:42 RacketCommitBot: [racket/master] racket/class: add `dynamic-get-field' and `dynamic-set-field!' - Matthew Flatt
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19:25 lewis1711: how can I make the accessors of a struct public? ie, provide them outside the module. do i have to do it explicitly for each one?
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19:39 lewis1711: http://docs.racket-lang.org/reference/require.html#%28form._%28%28lib._racket/private/base..rkt%29._struct-out%29%29 got it :)
19:39 rudybot: http://tinyurl.com/cs5zt3q
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21:00 Fare: Hum. How do I do epigrams in scribble?
21:01 Fare: i.e. a quote that's specially typeset on a block that vastly indented, at the start of a chapter.
21:01 offby1: beats me
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21:19 lewis1711: what sort of a function can I use to fold a list into a smaller list, but not an atom?
21:19 lewis1711: ie I don't want to fold all of it, but maybe just two elements based on some condition
21:20 offby1: well, "fold" is pretty general
21:21 offby1: I use for/fold all the time.  Or I did, back when I actually wrote Racket code
21:21 lewis1711: as a stupid example, I have a list of numbers '(1 1 2 3 4). and I want to add all numbers that are eq? to 1, to get '(2 2 3 4)
21:27 lewis1711: rudybot: (for/fold ([n '(1 1 2 3 4)]) #:when (>= n 1) +)
21:27 rudybot: lewis1711: error: #<undefined>:1:0: for/fold: bad syntax in: (for/fold ((n (quote (1 1 2 3 4)))) #:when (>= n 1) +)
21:30 lewis1711: rudybot: (for/fold ([sum 0])
21:30 lewis1711: ([n '(1 1 2 3 4)]
21:30 lewis1711: #:when (>= 1 n))
21:30 lewis1711: (+ sum n))
21:30 rudybot: lewis1711: DrRacket doesn't indent for/fold correctly
21:33 bremner: rudybot: eval 'something
21:33 rudybot: bremner: your sandbox is ready
21:33 rudybot: bremner: ; Value: something
21:47 lewis1711: wish there was a find duplicates
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21:53 lewis1711: I've got it - partition the list, fold one of the partitions, then append the two lists.
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23:33 lewis1711: well, that was the post painful list-processing I have done in quite some time :)
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23:36 asumu: lewis1711: finding duplicates?
23:37 lewis1711: asumu: no, folding only some elements in a collection if they meet some criteria and passing the rest unhindered
23:37 lewis1711: I implemented haskells groupBy
23:37 lewis1711: that helped
23:38 asumu: Oh okay. Racket has a group-by. Also check-duplicate.
23:38 asumu: rudybot: (require unstable/list)
23:38 rudybot: asumu: Done.
23:38 asumu: rudybot: doc group-by
23:38 rudybot: asumu: http://docs.racket-lang.org/unstable/list.html#(def._((lib._unstable%2Flist..rkt)._group-by))
23:38 asumu: rudybot: doc check-duplicate
23:38 rudybot: asumu: http://docs.racket-lang.org/unstable/list.html#(def._((lib._unstable%2Flist..rkt)._check-duplicate))
23:39 lewis1711: why were you not here an two hours ago :(
23:41 lewis1711: the API of check-duplicate is very confusing
23:41 asumu: Sorry. :p At least you got some exercise though.
23:42 lewis1711: that's true
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