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09:09 Jonas_: Hi
09:09 Jonas_: does anybody know here of a racket language called combo?
09:10 Jonas_: shoud be some kind of mixture between "advanced student" and "essentials of programming languages"
09:10 Jonas_: I build a function simulation framework in "advanced student" and now need to use the "eval" function from "essentials of programming languages"
09:11 Jonas_: my teacher told me a couple of days ago that with the combo language eval is added to "advanced student" but I can't seem to find the option/language in my installation
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12:06 scifi: hi i have some troubles with my code, i cant seam to be able to define   a pair between 2 lists, that analises if in each list
12:06 scifi: there are pairs
12:07 scifi: of numbers
12:07 jeapostrophe: i don't understand your question
12:07 jeapostrophe: what is a pair between 2 lists?
12:07 scifi: ill refraze
12:07 scifi: frase
12:07 jeapostrophe: wait, are you a student working on an assignment?
12:08 scifi: i want to make a pair of two list
12:08 scifi: no
12:08 scifi: essencialy im just trying to learn
12:08 scifi: some values
12:08 scifi: i have a test soon
12:08 scifi: so im training
12:08 jeapostrophe: what is a pair of two lists?
12:09 scifi: essencialy (cons (list    1) (list 2))
12:09 jeapostrophe: okay, so do that?
12:09 scifi: well
12:09 scifi: i wanna make something like
12:09 scifi: condicional
12:09 scifi: and analise if in every list
12:09 scifi: there is a pair in them
12:09 jeapostrophe: (andmap pair? l) ?
12:10 scifi: (cond ((and (pair? (car (list 1)
12:10 scifi: problem its a list of severall
12:10 scifi: pairs
12:10 scifi: 2 list of severall pairs
12:11 scifi: map?
12:11 scifi: andmap=?
12:12 Jonas_: @jeapostrophe - do you know a language called combo?
12:12 jeapostrophe: Jonas_: i do not. should i?
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12:12 jeapostrophe: scifi: i'm sorry, i just don't understand. try writing test cases and applying the design recipe
12:13 scifi: hm what does andmap means
12:13 scifi: btw
12:13 jeapostrophe: look it up in the help desx
12:13 scifi: ok
12:13 scifi: sure
12:13 scifi: i will
12:13 Jonas_: @jeapostrophe - hmmm, I had hoped so, I'm looking for a language which can make use of the "eval" function as well as the syntax of the advanced learner language in dr racket
12:13 Jonas_: I had heard that combo can do it but can't find this language (setting?!) in dr racket
12:14 jeapostrophe: Jonas_: ah. unless an instructor has made a custom language called combo, it does not exist. it has never been in any release of drracket in the last 10 years
12:15 Jonas_: @jeapostrophe - Ok thanks for the info. Any ideas which language I could use instead for "eval" and "empty?"/"first"/"rest"?
12:16 jeapostrophe: #lang racket
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12:19 Jonas_: @jeapostrophe: Fantastic, thank you so much, that worked beautifully!
12:19 scifi: ok i know aht andmap is
12:19 scifi: but cant i do
12:19 scifi: and (andmap
12:20 scifi: (and (andmap pair? lst1) (andmap pair? lst2))
12:20 scifi: and aply an if statement to it
12:20 scifi: it says its an error
12:20 scifi: aplied
12:21 scifi: it expects a procedure
12:22 scifi: nvm
12:22 scifi: it works
12:22 scifi: xD
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12:56 tv|z: I just forked github.com:plt/racket.git and added #:tcp@ to ws-serve (for wss support).
12:56 tv|z: Is it ok to request a pull or is there some process I missed?
12:58 jonrafkind: i guess a request is fine
12:59 jonrafkind: do you have one ready?
12:59 tv|z: yes
13:01 tv|z: ok, I filed the request
13:01 jonrafkind: cool
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14:15 eli: tv|z: It's more effective to send it to the dev@racket-lang.org list, we can't pull on GH since it's just a mirror.
14:16 jonrafkind: you should clarify what "it" is
14:17 eli: The same as your "one".
14:18 jonrafkind: oh, I thought a pull request was specific to github
14:19 jonrafkind: and otherwise you sent around patches
14:19 eli: It is.
14:19 jonrafkind: so how can you send a pull request that is not associated with github
14:20 eli: A pull request is equivalent to a patch.
14:21 samth: eli, you could pull from his github project
14:22 samth: and then push to master
14:22 eli: As could Jay, who I already forwarded it to.
14:22 samth: right
14:22 samth: i didn't mean that you personally should do it, only that it isn't specific to github
14:23 eli: Yes, yes. like I said, a pull request is equivalent to a patch.  Can we go back to work now?
14:23 samth: i doubt it
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14:37 scifi: is there a way to a program to return a pair like (2.1) (2.2) without using
14:37 scifi: cons or list
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14:43 jonrafkind: `values' ?
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14:50 scifi: hm?
14:50 scifi: values
14:50 scifi: ???
14:52 jonrafkind: ?????????????//////////////////////////////////////////////
14:52 scifi: i got it
14:52 scifi: lol
14:53 scifi: thanks
14:54 scifi: i schemed it serves me a lot
14:54 scifi: never saw its notation
14:56 scifi: btw is there something similar to break
14:56 scifi: in scheme
14:57 scifi: that jumps off a procedure
14:58 rapacity: you can use continuations
14:58 rapacity: let/cc
14:59 eli: (let/ec break (stuff) (break) (stuff))
15:01 scifi: ty
15:01 eli: yw
15:03 jeapostrophe: eli: you can point me to your reference if you want
15:05 eli: jeapostrophe: ?  You mean the url?
15:10 samth: jeapostrophe, what's the deal w/ drdr?
15:14 Lajla: Can someone explain why (apply apply + '()) for instance doesn't work and produces an error?
15:15 clklein: Lajla: For the same reason that (apply +) doesn't work
15:15 clklein: ("apply expects at least 2 arguments")
15:16 Lajla: clklein, how to fix it
15:17 Lajla: (apply apply + '() '())?
15:17 jeapostrophe: eli: in response to my confusion about the push
15:17 jonrafkind: (apply apply + '((1 2)))
15:17 jeapostrophe: samth: my vnc thing fixed a few problems but not others
15:17 jonrafkind: (apply apply + '(()))
15:17 jeapostrophe: i have no idea why
15:17 Lajla: Ahhh, yes
15:18 Lajla: (apply apply + '() '()) seems to also be accepted to produce 9
15:18 Lajla: 0*
15:19 jeapostrophe: samth: and right now i need to finish the pldi paper so i probably won't try much this week
15:20 samth: jeapostrophe, i was just wondering why it isn't running
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15:21 jeapostrophe: ah... the connection to the git server stalled:
15:21 jeapostrophe: purify-http-port: Connection ended before headers ended
15:21 jeapostrophe: and then it hung forever
15:21 samth: fun
15:21 samth: you should write some service that tells you if its dead
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15:24 jeapostrophe: i did but i'm not runnig
15:24 jeapostrophe: i thought eli said he could do it on the machine that is monitoring all the sites so i haven't
15:25 jonrafkind: maybe you can use nagios
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16:17 clklein: I'm trying to write a specialized version of `set!' that only works on variables introduced using a special binder, call it `slet'
16:18 jonrafkind: make-set!-transformer
16:18 clklein: I thought maybe a syntax parameter was the way to do it (record which variables can be the target of `slet'), but I'm not sure if I'm on the right track.
16:18 samth: well, just have `slet' expand to (let ([hidden-state ...]) (let-syntax ([name (some struct that `my-set!' knows about)]) ...))
16:18 jonrafkind: or maybe syntax-properties
16:19 samth: jonrafkind, syntax properties def won't work
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16:26 clklein: samth: I don't follow. I take it that `my-set!' will get a hold of the struct somehow (syntax-local-value maybe?) and check that it's an OK target, but `name' also needs to be a transformer that expands into references to the variable.
16:27 samth: exactly, clklein
16:28 clklein: so it's an applicable struct?
16:28 samth: yes
16:28 clklein: that's pretty cool
16:29 samth: clklein, you can even use `set!' instead of `my-set!' if you use `make-set!-transformer'
16:30 clklein: I thought I didn't follow because I forgot that transformers are regular ol' procedures. I thought I needed some weird struct-transformer hybrid that I didn't know how to get.
16:31 clklein: Anyway, this sounds easy enough, but out of curiosity, is there a reasonable way to do this using a syntax parameter?
16:32 samth: no
16:32 samth: syntax parameters are for having the same variable mean different things in different places
16:32 clklein: oh
16:32 samth: they're similar to parameters, except they vary based on the static context they're used in
16:34 clklein: Your second explanation is what made me think they would work: I want a value (a list of my-set!-able variables) that varies based on static context
16:34 clklein: but it sounds like its the binding associated with the syntax parameter that changes
16:34 samth: do you want to have a name to refer to all of them at once?
16:34 samth: yes
16:35 clklein: got it
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16:35 samth: if you want that name, then a syntax parameter is what you want
16:42 clklein: ok, thanks
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18:12 singintime: hello world :)
18:12 jonrafkind: 42
18:14 singintime: always a good answer... THE answer :P
18:14 samth: hello
18:17 singintime: good to see there's a quite crowded irc channel about racket... I think I'll need some support for the next months
18:18 singintime: I just installed fluxus
18:18 singintime: and know nothing about scheme )
18:18 singintime: :)
18:20 jonrafkind: me neither
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18:22 Axsuul: Is there a "scheme" way of doing this? Going through a data structure such as ..   (a b) 1 ((a b) 2) and finding shared objects.. in this case, (a b) is shared
18:25 singintime: hmmm... from what I know about other functional languages...
18:26 singintime: make a function which tests if an element x is contained in the structure
18:26 singintime: and enclose it in another function
18:27 singintime: which takes just the structure as parameter
18:28 singintime: the outer function calls the inner function
18:28 singintime: where x is the first element of the structure
18:28 singintime: ..
18:28 singintime: ugh
18:28 singintime: it's getting complicated
18:29 singintime: I'll try...
18:30 singintime: (define (shared? xs)
18:30 singintime: (cond
18:30 singintime: ((null? l) #f)
18:31 singintime: ((member? (car l) (cdr l)) #t)
18:31 singintime: (else (shared? (cdr l)))
18:32 singintime: )
18:32 singintime: )
18:32 singintime: (ahem... substitute "xs" with "l" :) )
18:32 singintime: makes sense?
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18:39 singintime: gotta go to bed... goodnight to people east from UTC+1, good evening to the rest of the world!
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18:39 jonrafkind: you should probably do something like get the hash of all the elements and then compare hashes
18:45 Axsuul: thanks, that should help get me started
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18:46 Axsuul: jonrafkind: how do you get the hash?
18:48 jonrafkind: equal-hash-code
18:49 jonrafkind: theres also eq-hash-code
18:50 samth: just build as hash table as you go
18:51 jonrafkind: yea thats probably easier
18:51 samth: (define (f l) (for/fold ([l* null] [h (hash)]) ([e (in-list l)]) (if (hash-ref h e #f) (values (cons e l*) h) (values l* (hash-set h e #t)))))
18:52 samth: composed in my irc client, so it prob won't work
18:57 Axsuul: samth: what does * mean
18:57 jonrafkind: hahahhaa
18:57 Axsuul: oh, is that a valid
18:58 Axsuul: identifier
18:58 jonrafkind: it doesnt mean anything.. its just poor naming conventions
18:58 Axsuul: Ah ok haha
18:59 samth: it's the equivalent of f' in math (we can't use ' b/c it means `quote')
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20:07 chandler: I've also seen ^ used for that, but maybe that's an Indiana thing.
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20:19 clklein: I recently discovered that, on a Mac, shift+option+] gives a great prime symbol which you can use in an identifier
20:19 bremner: yay non-portable identifiers
20:19 clklein: portable?
20:19 bremner: I guess its unicode, so emacs can do it
20:20 bremner: I mean, I'm not buying a mac to edit your code :)
20:21 clklein: just a matter of figuring out how to type it in another environment, as you said
20:24 clklein: jonrafkind: Now, not only do you need to understand what the variable's name means but you also need to learn how to type it
20:24 jonrafkind: ill schedule a lobotomy immediately
20:27 clklein: I think I've managed to refrain from using it in code someone else might edit, but it's only a matter of time before I slip up :)
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20:36 bremner: (define ☃ 'snow-man-with-snow)
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21:17 Guest66121: anyone know how to generate sound in racket? either in real time or into a file.
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