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00:51 mithos28: Is there a list anywhere of what bit patterns are used to represent values in racket?
00:52 mithos28: I'm trying to debug a crash, where it is trying to free 0x9000000000000000
00:56 jonrafkind: thats a big number
00:56 mithos28: right, likely a constant like '() or #f
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00:57 mithos28: something is corrupting lots of memory actually, as scheme_do_eval has 54550296 arguments supposedly
01:01 didi: mithos28: Looks like a memory position for a x86_64 machine.
01:10 mithos28: Well, I can corrupt memory at startup
01:11 mithos28: now to see if anyone can fix my issue
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07:43 MightyFoo: why would the racket type checker whinge about:  Expected Index, but got Positive-Fixnum in:...
07:43 MightyFoo: isn't a Positive-Fixnum a subtype of Index?
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07:57 soegaard: Index can be stored in a Fixnum.
07:57 soegaard: Oops.
07:58 soegaard: I read Positive-Integer and not Positive-Fixnum.
08:04 soegaard: It seems the upper limit of an Index is smaller than the largest fixnum
08:04 soegaard: See figure 2: http://www.ccs.neu.edu/racket/pubs/padl12-stff.pdf
08:07 noelw: typed racket just likes whinging.
08:07 noelw: Also, the numeric hierarchy is SOOOOOOO complex
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08:10 MightyFoo: the scheme numeric tower is pretty hefty... the typed racketeers didn't choose an easy life for themselves
08:12 MightyFoo: and *tell me* about the whinging!
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09:03 red_trumpet: hi :)
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09:23 MightyFoo: red_trumpet: hello
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10:19 samth: jeapostr1phe: what's with the 1 ?
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10:20 jeapostr1phe: samth: i think it's the name my irc client automatically uses if mine isn't available
10:20 samth: :)
10:20 jeapostr1phe: samth: i just had a crash so maybe i was really connected
10:20 jeapostr1phe: before
10:20 jeapostr1phe: i use linux on a macbook air and the nvidia display driver crashes too much
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10:22 samth: ta-da
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10:26 jeapostrophe: :)
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11:31 asumu: Also, some fun Racket behavior: `racket foo.rkt` on a non-existent `foo.rkt` can still run the program...
11:31 asumu: (if it was previously compiled in that directory)
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11:32 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/MxX4bQ
11:32 RacketCommitBot: racket/master 5d57f6e Matthew Flatt: ffi/unsafe/custodian: fix weak-reference problem...
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12:25 soegaard: Is #:break working with for: in Typed Racket ?
12:27 stamourv: soegaard: I don't know.
12:28 stamourv: We didn't do anything to make it work, but it may work naturally.
12:28 stamourv: Do you have an example I could try?
12:28 soegaard: It was added very recently to Racket
12:28 soegaard: two secs, and I'll have an example
12:28 stamourv: Right, byt `for:' expands into `for', so it may just work.
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12:30 soegaard: rudybot: (for ([x 10] #:break (> x 3)) (display x))
12:30 rudybot: soegaard: your sandbox is ready
12:30 rudybot: soegaard: error: #<undefined>:1:13: for: bad sequence binding clause at: #:break in: (for ((x 10) #:break (> x 3)) (display x))
12:30 soegaard: Oh. Rudybot is too old.
12:30 soegaard: Anywas it prints 0123.
12:30 soegaard: (for: ([x 10] #:break (> x 3)) (display x))
12:30 soegaard: Gives the error:
12:31 soegaard: There were multiple syntax errors. The first error follows:
12:31 soegaard: expected optionally type-annotated identifier in: #:break
12:32 stamourv: Right.
12:33 stamourv: Most changes to the `for' forms, `for:' and co get for free, but changes to the clause syntax, we need to add manually.
12:33 stamourv: I
12:33 stamourv: 'll fix it.
12:33 soegaard: Thanks
12:34 soegaard: If I recall correctly Matthew added #:break and one other keyword at the same time.
12:35 stamourv: Sounds right.
12:35 stamourv: I'll see if I can add all of them.
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13:46 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/b5wgKg
13:46 RacketCommitBot: racket/master e501695 Jens Axel Søgaard: Improved performance of prime? for small numbers
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14:46 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/AnfUFA
14:46 RacketCommitBot: racket/master dbffc84 Greg Hendershott: Render `@hyperlink` in Markdown....
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15:35 samth: the math library is so cool
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16:38 bartbes: markdown?
16:38 bartbes: oh, scribble to markdown?
16:38 asumu: bartbes: scribble can render to markdown now
16:39 asumu: yea.
16:39 asumu: Thanks to greghendershott
16:40 bartbes: I should properly use scribble sometime..
16:40 bartbes: and slideshow, for something other than displaying standard-fishes
16:40 stamourv: Scribble is great!
16:40 stamourv: I wrote my website with it.
16:41 jonrafkind: how do you customize how the scribble html output looks
16:41 jonrafkind: as in the navigation elements and whatnot
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16:44 stamourv: I don't.
16:44 stamourv: Last time I tried to to web design, I ended up with angry fruit salad. So I just don't.
16:45 bartbes: heh
16:45 bartbes: can I get a link to your site?
16:45 stamourv: http://www.ccs.neu.edu/home/stamourv/
16:45 stamourv: It's pretty basic.
16:46 bartbes: ah yes, I can see the scribble navigation ;)
16:46 stamourv: With a bit of css, you could also make the output not look like the Racket docs.
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16:47 bartbes: yeah, probably
16:47 bartbes: I prefer to stay away from webdev though
16:48 jonrafkind: well as far as personal pages for academics go at least its not so bad looking
16:48 jonrafkind: most pages are the absolute bare minimum in terms of design
16:48 bartbes: heh, reminds me of a course website I had to look at way too often
16:48 bartbes: bright red background and black text
16:49 bartbes: it's not good for your eyes, especially in the morning
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17:08 Cryovat: stamourv: I like your hair :D
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18:57 stamourv: Cryovat: Thanks!
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19:17 lewis1711: I really need to benchmark stuff more often. it's so easy in racket and I do a lot of stuff because I assume it's faster, then I benchmark it and it's not (fun fact- using lists as trees is much faster than vectors, it seems)
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19:27 acarrico: Is there a way to restrict the initial imports of #lang, like you can with require using except-in?
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19:35 asumu: acarrico: not really, but you can override #lang imports so it's usually not a huge problem.,
19:35 asumu: Do you have an example use case?
19:35 asumu: lewis1711: why not trees as trees? :p
19:36 acarrico: Alternatively, is there a #lang that just has require?
19:36 acarrico: asumu: in this case I wanted to exclude some stuff from racket/base.
19:36 asumu: No, since even #%kernel has the runtime primitives.
19:37 asumu: You can define one yourself though.
19:37 lewis1711: asumu: I don't follow. aren't trees just lists, really? what data strcture would I use?
19:37 asumu: lewis1711: when I think of trees, I think of a data definition like: A Tree<A> is either * (mt-tree) or * (node Tree<A> Tree<A>)
19:38 acarrico: asumu: ok thanks, I thought there might be something hanging around. Also, what is the best way to get a list of what is exported from a module?
19:38 asumu: acarrico: I think there's a function module->exports
19:38 asumu: rudybot: (module->exports 'racket/list)
19:38 rudybot: asumu: ; Value: ((0 (add-between ()) (append* ()) (append-map ()) (argmax ()) (argmin ()) (cons? ()) (count ()) (drop ()) (drop-right ()) (eighth ()) (empty ()) (empty? ()) (fifth ()) (filter-map ()) (filter-not ()) (first ()) (flatten ()) (fourth ()) (last ()) (last-pair ()) (make-list ()) (ninth ()) (partition ()) (range ()) (rest ()) (second ()) (seventh ()) (shuffle ()) (sixth ()) (split-at ()) (split-at-right ()) (take
19:38 rudybot: asumu: ; Value#2: ((0 (remove-duplicates ())))
19:38 lewis1711: asumu: what would that look like in racket? :/ those look like ML or haskell trees to me
19:39 asumu: rudybot: eval (struct mt-tree) (struct node (left right)) (node (node (mt-tree) (mt-tree)) (mt-tree))
19:39 rudybot: asumu: error: #<undefined>:1:0: struct: bad syntax; missing fields in: (struct mt-tree)
19:39 asumu: rudybot: eval (struct mt-tree ()) (struct node (left right)) (node (node (mt-tree) (mt-tree)) (mt-tree))
19:39 rudybot: asumu: ; Value: #(struct:node #(struct:node #(struct:mt-tree) #(struct:mt-tree)) #(struct:mt-tree))
19:40 lewis1711: oh rigt
19:40 lewis1711: I can't use structs for these trees because they're n-arity
19:40 acarrico: doesn't work on '#%kernel though.
19:40 lewis1711: by that I mean, n isn't fixed
19:43 acarrico: lewis1711: must be small n if lists really are faster.
19:43 lewis1711: yes
19:44 acarrico: rudybot: (module->exports '#%kernel)
19:44 rudybot: acarrico: your sandbox is ready
19:44 rudybot: acarrico: error: module->exports: expects argument of type <module path, module-path index, or resolved-module-path>; given: '#%kernel
19:47 acarrico: I guess you can't use #%kernel with #lang anyway because of the special characters.
19:47 acarrico: I guess asumu's idea of defining your own is the best way.
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19:53 greghendershott: DrRacket expressions pane doesn't seem to have history?
19:53 greghendershott: I find myself pressing C-p or M-p out of habit, but either go up or get a √
19:54 Kaylin: ctrl + arrow keys (up/down) seems to work for me
19:55 acarrico: M-p works for me
19:55 Kaylin is on windows, if it matters.
19:55 acarrico: do you have it in emacs mode?
19:57 greghendershott: Kaylin: Oh right, that used to work for me on Windows. I've been on OSX the last year.
19:57 lewis1711: http://pastebin.com/QDchXMx5 how do I functionally update the struct of a struct? line 37 "bound indentifier in module: x"
19:58 greghendershott: acarrico: Yes, emacs mode
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20:02 greghendershott: ok OSX 10.7 wants ctrl up/down for "Mission Control", DrR doesn't get them. I disabled that in OSX and now it works
20:02 greghendershott: *has used DrRacket mostly on Windows and OSX 10.6 before. is easily confused*
20:03 greghendershott: ok I'll sort it out — thanks for confirming it's supposed to work, that's what I needed to know!
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20:32 monktopher: Hi everyone. I'm currently working through h2dp 2e, and I'm stuck on the graphical editor problem. Does anyone know where I can find the solution to that problem?
20:33 monktopher: (the graphical editor problem in chapter 2.5.6)
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21:16 asumu: monktopher: the solutions for the textbook aren't online.
21:18 asumu: Anything in particular you're stuck on?
21:24 lewis1711: my crappy benchmarks leads me to assume that nested structures are expensive to update functionally
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21:37 lewis1711: http://pastebin.com/FcpZycGz why is the functional update so much slower? is there a simple optimisation I'm missing?
21:41 chandler: The functional version allocates, which is slower than not allocating. There isn't really anything you can do about that.
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21:56 greghendershott: lewis1711: I ran it and got about 1.3x slower, is that what you're seeing, too? Because I wouldn't necessarily sweat 1.3x unless this were actually a hot spot in your overall app.
21:57 greghendershott: Speed aside, functional/immutable hashes/structs etc. can sometimes be awkward as you need to "pass around" the updated thing.
21:59 lewis1711: greghendershott: twice as slow here. am just debating in my mind whether functional game entites/monters is worth it
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22:09 greghendershott: Sometimes it's easier to take a slow bug-free program and make it faster, than it is to take a fast buggy program and make it less buggy.
22:10 greghendershott: If you think sticking with functional for now will make it easier to get it correct, that would be a plus.
22:10 greghendershott: But if you don't think it really will, then of course it doesn't matter.
22:11 greghendershott: Just one of the trade-offs I would consider, myself.
22:17 greghendershott: In info.rkt is a version like "5.3.1.9" valid and practical?  Ex: (define required-core-version "5.3.1.9")
22:18 greghendershott: Otherwise to be safe I could use "5.2" and wait to update until Racket 5.2 is released.
22:20 lewis1711: I thought 5.3.1 was the latest...
22:21 greghendershott: It is but there are nightly builds of the upcoming release, or you can even build from source.
22:21 lewis1711: oh right
22:21 greghendershott: I have a Planet package that should use something that got added after 5.3.1. I'm not sure whether to update now, or wait.
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23:41 lewis1711: how can I pattern match against the value of multiple symbols?
23:42 mithos28: match*
23:43 lewis1711: rudybot: (define (f x y) (match (x y) [('x 'y) #t]))
23:43 rudybot: lewis1711: your sandbox is ready
23:43 rudybot: lewis1711: error: #<undefined>:1:30: match: syntax error in pattern in: ((quote x) (quote y))
23:43 lewis1711: rudybot: (define (f x y) (match* (x y) [('x 'y) #t]))
23:43 rudybot: lewis1711: Done.
23:43 lewis1711: rudybot: (f 'x 'y)
23:43 rudybot: lewis1711: ; Value: #t
23:43 lewis1711: rudybot: (f 'a 'y)
23:43 rudybot: lewis1711: error: match: no matching clause for '(a y)
23:43 lewis1711: mithos28: you're a lifesaver :)
23:43 mithos28: Is anyone running a windows box on here? I want to know what (find-system-path 'collects-dir) is on windows.
23:43 mithos28: No problem
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