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http://pastebin.com/d47fa9f40 10:53:18 map: expects type as 1st argument, given: (make-color 0 0 0); other arguments were: (list (make-color 42 47 47) (make-color 42 47 47) (make-color 42 47 47) (make-color 28 37 40) (make-color 42 47 47) (make-color 28 37 40) (make-color 42 47 47) (make-color 28 37 40) (make-color 42 47 47) (make-color 28 37 40) (make-color 28 37 40)... 10:53:29 for the given call in the last line 10:56:48 -!- dzhus is now known as dzhus[afk] 11:05:10 map expects a procedure as its 1st argument, (make-color 0 0 0) is not a procedure, it is a calling the procedure make-color. 11:05:54 hm 11:06:01 -!- dzhus[afk] is now known as dzhus 11:07:09 i have no clue :] 11:07:34 so, you were passing in (check-pixel (lambda (x) true)) as f 11:07:42 yup 11:07:49 it returns a struct 11:07:52 i see that 11:07:57 but how can i get that fixed? :] 11:08:02 which is a procedure call that evaluated to make-color 0 0 0) 11:09:12 hmm, so you are trying to test for a procedure? 11:09:26 -!- gottesmm [n=gottesmm@c121h014.wless.reed.edu] has quit [Read error: 60 (Operation timed out)] 11:09:41 try (procedure? f) 11:10:12 pfo [n=pfo@chello084114049188.14.vie.surfer.at] has joined #scheme 11:10:33 hm 11:10:59 i'm not trying to test for a procedure, it's just that map expects it 11:11:17 question is: how do i change check-pixel to work with map :] 11:12:01 is ~~p equal to p? 11:14:20 ? :o 11:14:24 instead of (make-color 0 0 0), try make-color, (no parens) 11:14:56 HG` [n=wells@xdslec048.osnanet.de] has joined #scheme 11:15:00 which is the variable that is the procedure 11:15:06 -!- foof [n=user@dn157-046.naist.jp] has quit [Remote closed the connection] 11:16:23 foof [n=user@dn157-046.naist.jp] has joined #scheme 11:16:58 [(boolean=? true (f 'something)) make-color] 11:17:01 so like this? 11:17:04 what is check-pixel supposed to be doing? 11:17:34 well, you are handing over check-pixel some random function and if it evals to true then return a white pixel, otherwise a black one 11:17:44 yes, but im not sure why you are passing in (lambda (x) true) 11:18:03 this was the example from my teacher :] 11:18:16 (lamba (x) true) just returns true 11:18:25 it is the easiest function returning true i guess 11:18:31 so the image is supposed to be completely white 11:19:34 yes, so you are handing it a pixel, which is not a procedure, which you are handing to filter-image, which then tries to pass the pixel as the first argument to map, but it is not a procedure 11:20:24 so maybe it is actually working correctly, but you dont want to apply it to a list 11:20:28 hm 11:20:33 -!- projections [n=projecti@88.235.101.2] has left #scheme 11:20:37 in filter-image 11:20:43 certainly not :] 11:20:48 -!- geofft [n=geofft@LUNATIQUE.MIT.EDU] has left #scheme 11:20:58 :) 11:21:07 or 11:21:08 well 11:21:12 (image->color-list img) 11:21:21 returns a list with (make-color .. .. ..) for each pixel 11:21:31 so in fact i want to apply the function to a list 11:21:41 because an image is sort of a list 11:25:11 gottesmm [n=gottesmm@c022h039.dorm.reed.edu] has joined #scheme 11:25:20 -!- poucet [n=vincenz@li23-146.members.linode.com] has quit ["leaving"] 11:25:27 so, you want to change the list that image->color-list returns, to one of black and white pixels? 11:26:19 -!- ASau [n=user@193.138.70.52] has quit [Remote closed the connection] 11:26:31 yes 11:26:49 depending on whether a function given to check-pixel evals to true or false 11:31:33 maybe this is what you want? 11:31:35 http://pastebin.com/d15e5e41d 11:32:02 you need to build a procedure that changes the list or builds a new one to pass into map 11:32:15 hm 11:32:37 wow, i have no clue what !set does 11:33:12 that is the assignment operator, it might be something else if you are using a slightly different language 11:34:15 so (set! x 10) is like x = 10 11:34:37 yep 11:34:59 did that work? 11:35:39 ah, it is kind of not the assignment 11:36:17 because there are some tests given, and we shouldnt use things we haven't learned about yet 11:36:43 ah, im sorry, but i dont want to do your homework for you either so perhaps it is for the best heh 11:36:57 hmm 11:37:07 :P 11:37:17 yeah, well I don't want that either 11:37:28 i suggest you try building a list then, instead of mutating it, 11:37:39 i have e.g. 11:37:39 (filter-img robocup (lambda (x) (make-color 255 0 0))) 11:37:42 this test 11:37:53 which generates a completely red image 11:37:54 and it works 11:38:25 but the lambda function then again evals to a color, why is there no error thrown? 11:38:37 which is (make-color 255 255 255)? 11:38:44 check-pixel evals to some (make-color . . .) too 11:38:50 255 0 0 = red 11:39:58 that works the way you had it before? 11:40:08 alaricsp [n=alaricsp@88-202-197-217.rdns.as8401.net] has joined #scheme 11:40:09 (filter-img robocup (lambda (x) (make-color 255 0 0))) works quite well 11:40:29 with the version of filter-img you posted? 11:40:33 yes 11:40:41 mmc [n=mima@cs138007.pp.htv.fi] has joined #scheme 11:40:50 so i thought i just needed to return some (make-color . . .) in check-pixel as well 11:40:56 but it wouldn't let me do that 11:41:43 -!- antoszka [n=antoszka@unaffiliated/antoszka] has quit ["+++ killed by SIGSEGV +++"] 11:42:38 oh, that is because (lambda (x) (make-color 255 0 0)) creates a procedure 11:43:24 its not (make-color 255 0 0), its a procedure that makes that particular pixel 11:43:44 and takes 1 argument that it does not use 11:43:52 hm 11:44:13 but, out of my point of view 11:44:37 i give check-pixel (f) (make-color . . .) to filter-img 11:45:30 yea, you are calling check-pixel, try passing in a lambda expression that calls check-pixel maybe? 11:46:38 (filter-img robocup (lambda (x) (check-pixel (lambda (x) true)))) 11:46:39 like this? :D 11:46:45 because it looks weird :D 11:47:06 weird, works :D 11:47:12 brb 11:47:23 lambda creates procedures, and the error is that you are trying to apply something that is not a procedure in map, the other one worked because it was a procedure 11:47:32 cracki [n=cracki@sglty.kawo2.RWTH-Aachen.DE] has joined #scheme 11:48:48 ok 11:48:50 funny one 11:48:53 i was just on the toilet 11:49:01 and i think i got the answer :D 11:49:29 oh boy works :D 11:49:31 [(boolean=? true (f 'something)) (lambda (x) (make-color 0 0 0))] 11:49:31 [else (lambda (x) (make-color 255 255 255))] 11:49:46 thanks man 11:49:47 :) 11:50:23 no problem, im just learning scheme as well 11:50:31 hehe 11:50:46 i'm doing scheme in university, for like a month now 11:51:07 cool 11:51:13 2 weeks until java 11:51:19 they dont teach any of the classes in scheme at mine :( 11:51:31 sh10151 [n=user@cpe-76-181-82-14.columbus.res.rr.com] has joined #scheme 11:51:38 actually, i think programming languages a little bit 11:53:01 -!- cel [n=cel@121.Red-79-151-50.dynamicIP.rima-tde.net] has quit [] 11:55:35 -!- dzhus is now known as dzhus[afk] 11:55:53 -!- dzhus[afk] is now known as dzhus 11:57:33 -!- gottesmm [n=gottesmm@c022h039.dorm.reed.edu] has quit ["Ex-Chat"] 12:04:37 photon [n=photon@unaffiliated/photon] has joined #scheme 12:07:17 blackened` [n=blackene@ip-89-102-208-138.karneval.cz] has joined #scheme 12:10:01 -!- dzhus is now known as dzhus[afk] 12:13:01 -!- jedc [n=lore17@c-98-232-225-102.hsd1.or.comcast.net] has quit ["Leaving"] 12:13:15 jedc [n=lore17@c-98-232-225-102.hsd1.or.comcast.net] has joined #scheme 12:14:23 jed17 [n=jed1@c-98-232-225-102.hsd1.or.comcast.net] has joined #scheme 12:14:46 -!- jed17 [n=jed1@c-98-232-225-102.hsd1.or.comcast.net] has left #scheme 12:15:16 -!- jedc [n=lore17@c-98-232-225-102.hsd1.or.comcast.net] has left #scheme 12:15:45 -!- sh10151 [n=user@cpe-76-181-82-14.columbus.res.rr.com] has quit [Read error: 110 (Connection timed out)] 12:24:31 Edico [n=Edico@unaffiliated/edico] has joined #scheme 12:26:25 ehm 12:26:35 when i apply a function to a list using map 12:26:42 e.g. (map somefunction list) 12:27:00 how can i access the list-item in somefunction? 12:27:55 It is passed as an argument to somefunction 12:28:31 i thought of that 12:28:43 so (define (somefunction x) ...) 12:28:48 the x contains the current item 12:28:58 yes 12:29:29 good, this ain't working for me :) 12:29:39 What's good about that? 12:29:40 :) 12:30:24 (define (alpha x) 12:30:24 (make-alpha-color transparency x-red x-green x-blue))) 12:31:13 http://pastebin.com/m94844cc 12:31:16 x-red: name is not defined, not a parameter, and not a primitive name 12:31:50 You didn't define x-red 12:31:55 Where does it come from? 12:32:26 isn't it passed to alpha? 12:32:33 No, only x is 12:32:55 If you want to have the red component of x, you probably need to call a procedure that extracts it from x 12:33:16 (image->alpha-color-list img) 12:33:21 this is a list of structs 12:33:32 so each element i'm working on is a struct 12:33:58 and how do you obtain the value from a slot of a struct object? 12:34:03 so I'd like x to be the current item working on, and x-red its selector 12:34:52 -!- alaricsp 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Is there no function that reads characters one-by-one without having to press enter? 15:12:56 you'd have to switch your terminal to unbuffered mode 15:12:58 -!- projections [n=projecti@88.235.101.2] has quit [] 15:13:16 if you're using chicken, I think you can use the stty egg to make that happen 15:14:41 sh10151 [n=user@cpe-76-181-82-14.columbus.res.rr.com] has joined #scheme 15:16:05 -!- sepult_ [n=sepult@xdsl-87-78-75-92.netcologne.de] has quit [Client Quit] 15:17:39 -!- higepon827 [n=taro@FLH1Aip247.tky.mesh.ad.jp] has quit [Read error: 113 (No route to host)] 15:18:38 if not, try the ncurses egg 15:18:54 technically speaking, unix doesnt behave as r5rs read-char does. 15:20:23 eat least the terminal doesnt. 15:20:33 Using curses is probably a better idea than messing with the terminal manually, I think 15:20:48 -!- gottesmm [n=gottesmm@c121h014.wless.reed.edu] has quit [Read error: 60 (Operation timed out)] 15:20:52 It's also a fatter dependency 15:20:54 nah, messing with the term manually is pretty easier. 15:20:59 er, pretty easy. 15:21:03 fairly portable, and tiny. 15:21:07 Yes, it'll be fatter 15:21:28 just have to be careful with control codes and backspaces 15:23:11 sepult [n=sepult@xdsl-87-78-75-92.netcologne.de] has joined #scheme 15:24:34 cornucopic [n=r00t@115.241.26.243] has joined #scheme 15:24:39 -!- sepult [n=sepult@xdsl-87-78-75-92.netcologne.de] has quit [Remote closed the connection] 15:25:08 sepult [n=sepult@xdsl-87-78-75-92.netcologne.de] has joined #scheme 15:36:18 gottesmm [n=gottesmm@c022h039.dorm.reed.edu] has joined #scheme 15:36:27 -!- npe [n=npe@91.181.23.242] has quit [] 15:38:05 Judofyr [n=Judofyr@c349BBF51.dhcp.bluecom.no] has joined #scheme 15:38:15 alaricsp [n=alaricsp@88-202-197-217.rdns.as8401.net] has joined #scheme 15:48:07 annodomini [n=lambda@c-75-69-96-104.hsd1.nh.comcast.net] has joined #scheme 15:52:47 -!- Judofyr [n=Judofyr@c349BBF51.dhcp.bluecom.no] has quit [Remote closed the connection] 15:55:25 -!- sh10151 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(define (somefunction x) ...) x? 17:00:10 -!- MasochisticLibra [n=Masochis@c-24-2-191-235.hsd1.ct.comcast.net] has quit [Read error: 104 (Connection reset by peer)] 17:00:13 rudybot: eval (map (lambda (thing) (printf "Yes, the thing is ~s~%" thing)) (list 1 'bob "a string")) 17:00:13 *offby1: ; Value: (# # #) 17:00:14 *offby1: ; stdout: "Yes, the thing is 1\nYes, the thing is bob\nYes, the thing is \"a string\"\n" 17:00:29 rudybot: eval (map (lambda (thing) (format "Yes, the thing is ~s~%" thing)) (list 1 'bob "a string")) 17:00:30 *offby1: ; Value: ("Yes, the thing is 1\n" "Yes, the thing is bob\n" "Yes, the thing is \"a string\"\n") 17:00:35 rudybot: eval (map (lambda (x) (+ x x) (list 1 2 3 4)) 17:00:37 hkBst: your sandbox is ready 17:00:37 hkBst: error: eval:1:0: read: expected a `)' to close `(' 17:00:42 rudybot: eval (map (lambda (x) (+ x x) (list 1 2 3 4))) 17:00:42 hkBst: error: map: expects at least 2 arguments, given 1: # 17:00:44 MasochisticLibra [n=Masochis@c-24-2-191-235.hsd1.ct.comcast.net] has joined #scheme 17:00:50 rudybot: eval (map (lambda (x) (+ x x)) (list 1 2 3 4)) 17:00:50 hkBst: ; Value: (2 4 6 8) 17:00:56 hexa: ^^^ 17:00:58 When the whip comes down -- I'll be running this town!! 17:01:00 o m g 17:01:08 which part of all of this would be useful? :D 17:01:27 ah ok, the last 17:01:29 hexa: in short, I think your idea is right. 17:01:34 thanks :P 17:01:35 hexa: the one without the errors 17:01:41 I'm not entirely certain, since I don't really understand what you meant, but I'm guessing. 17:01:45 hkBst: :) 17:01:49 hah :) 17:01:53 "The one with the ever-widening hole in it!" 17:02:01 thanks 17:04:32 -!- gottesmm [n=gottesmm@c022h039.dorm.reed.edu] has quit ["Ex-Chat"] 17:04:53 r00t_ [n=r00t@115.241.110.83] has joined #scheme 17:05:09 -!- cornucopic [n=r00t@115.241.26.243] has quit [Read error: 110 (Connection timed out)] 17:05:14 -!- a-s [n=user@92.80.117.81] has quit [Remote closed the connection] 17:06:06 -!- r00t_ 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[n=reprore@ntkngw261071.kngw.nt.ftth.ppp.infoweb.ne.jp] has joined #scheme 18:52:28 -!- reprore_ [n=reprore@ntkngw261071.kngw.nt.ftth.ppp.infoweb.ne.jp] has quit [Read error: 104 (Connection reset by peer)] 18:54:21 reprore_ [n=reprore@ntkngw261071.kngw.nt.ftth.ppp.infoweb.ne.jp] has joined #scheme 18:56:04 djork_ [n=djork@c-76-100-224-42.hsd1.md.comcast.net] has joined #scheme 18:58:55 -!- jao [n=jao@45.Red-83-37-138.dynamicIP.rima-tde.net] has quit [Read error: 104 (Connection reset by peer)] 19:07:06 bombshelter13_ [n=bombshel@209-161-234-188.dsl.look.ca] has joined #scheme 19:07:22 jao [n=jao@133.Red-83-33-182.dynamicIP.rima-tde.net] has joined #scheme 19:09:45 [bjoern] [n=bjoern@dslb-094-223-187-084.pools.arcor-ip.net] has joined #scheme 19:10:08 <[bjoern]> How can I make drscheme stop torturing me with terrible german? 19:11:05 -!- djork [n=djork@c-76-100-224-42.hsd1.md.comcast.net] has quit [Read error: 110 (Connection timed out)] 19:11:51 [bjoern], send a patch to the authors, that fix the german? 19:12:18 <[bjoern]> I was rooting for the simpler method of switching to english first. 19:12:19 or convince English-speakers that they should speak Hochtdeutch instead of their degenerate dialect? 19:12:29 <[bjoern]> However, I cannot locate the corresponding option. 19:12:42 <[bjoern]> I am working on the latter. 19:12:49 the option is there -- it's just named in bad german 19:13:22 help -> Use DrScheme in English 19:14:06 <[bjoern]> Thank you. 19:14:09 -!- [bjoern] [n=bjoern@dslb-094-223-187-084.pools.arcor-ip.net] has left #scheme 19:16:41 -!- sepult [n=sepult@xdsl-87-78-75-92.netcologne.de] has quit ["KVIrc 3.4.0 Virgo http://www.kvirc.net/"] 19:21:05 was it Hilfe ? 19:21:08 anyway 19:25:40 FunkyDrummer [n=RageOfTh@92.36.167.161] has joined #scheme 19:26:05 -!- reprore_ [n=reprore@ntkngw261071.kngw.nt.ftth.ppp.infoweb.ne.jp] has quit [Read error: 113 (No route to host)] 19:35:15 HG` [n=wells@xdslec048.osnanet.de] has joined #scheme 19:36:18 -!- alaricsp 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[n=Judofyr@c349BBF51.dhcp.bluecom.no] has quit [Remote closed the connection] 21:58:49 -!- npe [n=npe@195.207.5.2] has quit [] 22:00:02 what's the relationship between identifiers and symbols: representation? 22:00:12 are symbols singletons? 22:01:26 -!- hkBst [n=hkBst@gentoo/developer/hkbst] has quit [Remote closed the connection] 22:01:49 `Identifier' is a word that has seen various different meanings. The two most popular in the Scheme world are a string that lexically constitutes a readable symbol, and an object identifying a binding by a symbol and by hygienic context. 22:03:11 I'm thinking of identifier in the sense of r5rs 7.1.1; it seems to be a superset of `variable', and I'd like to parse identifiers as symbols when I encounter them. 22:03:51 In that case it is a string that lexically constitutes a readable symbol. 22:06:21 Symbols are strings only in a qualified sense, though, aren't they? r5rs 6.3.3: "The string->symbol procedure can create symbols for which this write/read invariance may not hold..." 22:06:32 I didn't say that symbols are strings at all. 22:07:08 Maybe `constitute' was misleading; `externally represent' would have been a better choice of verb. 22:08:49 -!- athos [n=philipp@92.250.250.68] has quit ["leaving"] 22:09:01 Now, to be fair, `readable symbol' in turn means a symbol whose string is a valid identifier, but the recursion is grounded by the production rule in Section 7.1.1. 22:11:18 -!- dudleyf [n=dudleyf@ip70-178-212-238.ks.ks.cox.net] has quit [] 22:13:09 saccade_ [n=saccade@65-78-24-47.c3-0.smr-ubr1.sbo-smr.ma.cable.rcn.com] has joined #scheme 22:13:16 -!- Edico [n=Edico@unaffiliated/edico] has quit ["Leaving"] 22:16:54 -!- saccade_ [n=saccade@65-78-24-47.c3-0.smr-ubr1.sbo-smr.ma.cable.rcn.com] has quit [Client Quit] 22:19:53 -!- foof [n=user@dn157-046.naist.jp] has quit [Remote closed the connection] 22:19:57 foof [n=user@dn157-046.naist.jp] has joined #scheme 22:20:23 projections [n=projecti@88.235.101.2] has joined #scheme 22:22:41 -!- copumpkin [n=pumpkin@Aeropuerto.Kiewit.Dartmouth.EDU] has quit ["Leaving..."] 22:23:28 -!- jao` [n=jao@52.Red-83-39-134.dynamicIP.rima-tde.net] has quit [Read error: 101 (Network is unreachable)] 22:25:51 Fare [n=Fare@guest-fw.dc4.itasoftware.com] has joined #scheme 22:26:25 -!- Guest55221 [n=m@dslb-088-066-253-165.pools.arcor-ip.net] has quit ["This computer has gone to sleep"] 22:33:31 meanburrito920_ [n=John@76-217-6-100.lightspeed.irvnca.sbcglobal.net] has joined #scheme 22:34:30 copumpkin [n=pumpkin@64.30.3.122] has joined #scheme 22:36:55 Riastradh: In any case, it sounds like identifier <-> symbol is a reasonable bijection; and I should be able to instantiate symbols as instances of a "memoized" string-subset. 22:38:59 -!- flaschenwein [n=olaf_rog@p5080AA0E.dip0.t-ipconnect.de] has left #scheme 22:48:04 copumpki [n=pumpkin@64.30.3.122] has joined #scheme 22:49:26 jonrafkind [n=jon@c-98-202-86-149.hsd1.ut.comcast.net] has joined #scheme 22:57:07 Gosh, the DrScheme debugger sure has gotten better since I last tried it 22:58:54 can it debug C# now? 23:01:22 *offby1* slaps jonrafkind upside the haid 23:02:11 morphir_ [n=morphir@217.168.81.9] has joined #scheme 23:05:45 saccade_ [n=saccade@65-78-24-47.c3-0.smr-ubr1.sbo-smr.ma.cable.rcn.com] has joined #scheme 23:08:01 Oh foof 23:09:15 gottesmm [n=gottesmm@c121h014.wless.reed.edu] has joined #scheme 23:13:29 synx: try louder 23:13:30 -!- saccade_ [n=saccade@65-78-24-47.c3-0.smr-ubr1.sbo-smr.ma.cable.rcn.com] has quit ["This computer has gone to sleep"] 23:14:05 -!- jewel [n=jewel@dsl-247-202-125.telkomadsl.co.za] has quit [Read error: 113 (No route to host)] 23:14:09 I sent him a pm, sorry. Have an idea/bug for his html parser. 23:15:28 -!- morphir [n=morphir@217.168.81.9] has quit [Read error: 101 (Network is unreachable)] 23:16:41 -!- morphir_ is now known as morphir 23:25:34 -!- ikaros_ [n=ikaros@f051019233.adsl.alicedsl.de] has quit ["Leave the magic to Houdini"] 23:28:22 mejja [n=user@c-f6b6e555.023-82-73746f38.cust.bredbandsbolaget.se] has joined #scheme 23:28:46 -!- Fare [n=Fare@guest-fw.dc4.itasoftware.com] has left #scheme 23:29:06 raikov [n=igr@60.32.127.43] has joined #scheme 23:29:06 reprore [n=reprore@ntkngw261071.kngw.nt.ftth.ppp.infoweb.ne.jp] has joined #scheme 23:31:17 -!- reprore [n=reprore@ntkngw261071.kngw.nt.ftth.ppp.infoweb.ne.jp] has quit [Remote closed the connection] 23:50:48 -!- raikov [n=igr@60.32.127.43] has quit [Read error: 104 (Connection reset by peer)] 23:51:08 raikov [n=igr@60.32.127.43] has joined #scheme 23:56:15 -!- gottesmm [n=gottesmm@c121h014.wless.reed.edu] has quit ["Ex-Chat"] 23:57:49 -!- Mr-Cat [n=Mr-Cat@93-80-227-156.broadband.corbina.ru] has quit [Remote closed the connection]