00:06:52 -!- masm [~masm@bl17-207-242.dsl.telepac.pt] has quit [Quit: Leaving.] 00:07:34 -!- rostayob [~rostayob@dyn1195-50.wlan.ic.ac.uk] has quit [Ping timeout: 260 seconds] 00:12:49 _schulte_ [~eschulte@c-174-56-50-60.hsd1.nm.comcast.net] has joined #scheme 00:13:35 -!- rageous [~Adium@75-168-46-109.mpls.qwest.net] has quit [Ping timeout: 260 seconds] 00:15:09 shadwick_away [~erik@host0-66.wifi.ubc.ca] has joined #scheme 00:15:15 -!- shadwick_away is now known as shadwick 00:15:55 -!- aking [~aking@67.23.13.119] has quit [Ping timeout: 265 seconds] 00:16:00 aking [~aking@67.23.13.119] has joined #scheme 00:25:29 -!- Lajla is now known as dat_eyesocket 00:55:15 virl [~virl__@85-127-158-77.dynamic.xdsl-line.inode.at] has joined #scheme 00:55:48 homie`` [~levgue@xdsl-78-35-154-53.netcologne.de] has joined #scheme 00:58:01 -!- homie` [~levgue@xdsl-84-44-153-51.netcologne.de] has quit [Ping timeout: 244 seconds] 01:01:17 -!- homie`` [~levgue@xdsl-78-35-154-53.netcologne.de] has quit [Quit: ERC Version 5.3 (IRC client for Emacs)] 01:03:20 xwl_ [user@nat/nokia/x-pkjwxnnvrmpmdwzg] has joined #scheme 01:03:22 -!- soveran [~soveran@186.19.214.247] has quit [Remote host closed the connection] 01:15:29 -!- dzhus [~sphinx@176.14.94.92] has quit [Remote host closed the connection] 01:20:59 rostayob [~rostayob@host86-137-12-68.range86-137.btcentralplus.com] has joined #scheme 01:25:00 soveran [~soveran@186.19.214.247] has joined #scheme 01:25:08 -!- sporous [~sporous@antispammeta/bot/irssi/sporous] has quit [Ping timeout: 240 seconds] 01:26:06 -!- soveran [~soveran@186.19.214.247] has quit [Remote host closed the connection] 01:27:01 sporous [~sporous@antispammeta/bot/irssi/sporous] has joined #scheme 01:27:54 -!- Euthydemus [~euthydemu@unaffiliated/euthydemus] has quit [Ping timeout: 272 seconds] 01:29:13 Euthydemus [~euthydemu@unaffiliated/euthydemus] has joined #scheme 01:30:57 soveran [~soveran@186.19.214.247] has joined #scheme 01:31:03 -!- soveran [~soveran@186.19.214.247] has quit [Remote host closed the connection] 01:31:09 there seems to be a parser combinator library included in racket 01:31:24 racket/combinator-parser 01:34:00 soveran [~soveran@186.19.214.247] has joined #scheme 01:34:32 -!- soveran [~soveran@186.19.214.247] has quit [Remote host closed the connection] 01:34:39 -!- jonrafkind [~jon@crystalis.cs.utah.edu] has quit [Read error: Operation timed out] 01:35:26 soveran [~soveran@186.19.214.247] has joined #scheme 01:42:00 no sorry, just combinator-parser 01:44:16 -!- soveran [~soveran@186.19.214.247] has quit [Remote host closed the connection] 01:46:50 snits [~snits@75-167-2-163.phnx.qwest.net] has joined #scheme 01:52:43 cswords [~cswords@c-98-223-234-80.hsd1.in.comcast.net] has joined #scheme 01:59:45 -!- rostayob [~rostayob@host86-137-12-68.range86-137.btcentralplus.com] has quit [Ping timeout: 260 seconds] 02:05:31 -!- shadwick [~erik@host0-66.wifi.ubc.ca] has quit [Ping timeout: 246 seconds] 02:19:47 -!- dat_eyesocket [~Lajla@2001:0:5ef5:79fd:1036:2b2d:ae33:eb94] has quit [Read error: Connection reset by peer] 02:24:09 Lajla [~Lajla@2001:0:5ef5:79fb:245f:2fd8:ae33:eb94] has joined #scheme 02:29:13 homie [~levgue@xdsl-78-35-154-53.netcologne.de] has joined #scheme 02:36:42 adu [~ajr@pool-72-83-26-98.washdc.fios.verizon.net] has joined #scheme 02:42:05 -!- Lajla is now known as Rekcuflluks 02:47:49 -!- lusory [~bart@bb115-66-195-54.singnet.com.sg] has quit [Ping timeout: 248 seconds] 02:53:45 -!- hypnocat [~hypnocat@unaffiliated/hypnocat] has quit [Quit: ZNC - http://znc.sourceforge.net] 03:01:13 -!- cswords [~cswords@c-98-223-234-80.hsd1.in.comcast.net] has quit [Read error: Connection reset by peer] 03:12:48 schemenewb [63e70dd8@gateway/web/freenode/ip.99.231.13.216] has joined #scheme 03:12:49 shadwick [~erik@S01060026f395c2b7.vc.shawcable.net] has joined #scheme 03:14:19 Hi, is there a way to check, with built in methods, whether a specific key has already been hashed by the mutable hash table returned by (make-hash)? 03:17:55 no, and it does not matter. make-hash could in theory just return 0 all the time and the hashtable will still work (just a 'bit' slower) 03:20:15 -!- rotty [~rotty@de.xx.vu] has quit [Ping timeout: 260 seconds] 03:21:04 realitygrill [~realitygr@adsl-76-226-129-104.dsl.sfldmi.sbcglobal.net] has joined #scheme 03:21:39 Is hash-ref lazy? 03:21:51 Lajla [~Lajla@2001:0:5ef5:79fb:c5b:2fd8:ae33:eb94] has joined #scheme 03:25:19 -!- Rekcuflluks [~Lajla@2001:0:5ef5:79fb:245f:2fd8:ae33:eb94] has quit [Ping timeout: 260 seconds] 03:26:26 rotty [~rotty@de.xx.vu] has joined #scheme 03:27:49 -!- forcer [~forcer@hmbg-5f77e160.pool.mediaWays.net] has quit [Ping timeout: 276 seconds] 03:28:03 leppie: `make-hash' constructs the table in Racket 03:28:08 it's not a hash function 03:28:18 schemenewb: `hash-ref' isn't lazy 03:28:25 tuubow_ [~adityavit@c-69-136-105-164.hsd1.nj.comcast.net] has joined #scheme 03:28:27 although i'm not sure what you're really asking 03:28:51 -!- Lajla is now known as Rekcuflluks 03:29:15 if the key was found is the failure-result still evaluated as a side effect. i guess not. 03:30:17 you're also right, that my question was ambigious. i should have just asked that straight away. 03:30:36 bfgun [~b_fin_g@r186-52-138-88.dialup.adsl.anteldata.net.uy] has joined #scheme 03:31:52 schemenewb: if you provide a *value* as the failure result, then it's always evaluated 03:32:06 if you provide a thunk, then it's only called if the lookup fails 03:32:20 rudybot: (define h (hash 1 "hi")) 03:32:20 samth: your sandbox is ready 03:32:20 samth: Done. 03:32:46 rudybot: (hash-ref h 1 (begin (displayln "hello") #f)) 03:32:46 samth: ; Value: "hi" 03:32:47 samth: ; stdout: "hello\n" 03:32:56 rudybot: (hash-ref h 1 (lambda () (begin (displayln "hello") #f))) 03:32:56 samth: ; Value: "hi" 03:33:02 schemenewb: like that 03:33:20 samth: oops :) 03:33:52 so hash-ref is a function? 03:34:04 -!- bfig [~b_fin_g@r186-52-178-252.dialup.adsl.anteldata.net.uy] has quit [Ping timeout: 260 seconds] 03:37:19 schemenewb, yeah, it's a function, so it just evaluates all of its arguments when you call it per the evaluation model, see it like (lambda () ... ) evaluates to a function if you will 03:38:36 I'm trying to use this to cache function's results (e.g. for generating fibonacci numbers). Is there a better approach? 03:39:11 schemenewb, you mean as in generate a lazy stream of 'all the fibonnaci numbers'? 03:39:43 I don't think he means lazy so much as memoized 03:39:43 calculate the nth number "recursively" without explicitly implementing the lookup 03:40:34 those """" are confusing 03:40:36 I'm lost, shadwick by the way, sorry about that last night, I think I was sleepwalking. 03:40:48 I was the 'anencephalic' thingie. 03:40:52 ahhhhh yes 03:40:55 I just ignored that 03:41:10 schemenewb, I am not sure what you mean. 03:41:15 schemenewb: a hash table is a fine approach for that 03:41:31 schemenewb: sorry, I missed the beginning. You just wanna cache the results for each result of the fibs function? 03:41:52 so that later computations of the same argumnet need only to look up the result? 03:41:58 exactly 03:42:28 its not my idea though 03:42:43 so something along the lines of just: if n in cache, fetch from cache, else compute 03:42:48 so dont help me too much ;) just looking for tools. 03:43:09 ah, well I started scheme yesterday-ish so I'm not too versed in what's available in it 03:43:35 actually 03:43:40 why not a vector? 03:43:51 oh ok. well given a particular input, i want to simply just lookup the output of a given function instead of recomputing it. im trading off memory for speed. 03:43:54 a lookup on N will need to compute all subsequent values anyways 03:44:14 im not too focused on fibonacci numbers 03:44:31 yeah, keep a vector with the values at each index the value for that fibonacci index 03:44:57 rudybot: (define (cached f) (define table (make-hash)) (define (g x) (cond [(hash-ref table x #f)] [else (define v (f x)) (hash-set! table x v) v])) g) 03:44:57 samth: Done. 03:45:00 your function need only look like: is the vector as long as N? yes: grab Nth item; no: compute Nth item, store in vector 03:45:12 samth is a hashtable really necessary? 03:45:13 schemenewb: that's a general memozing function 03:45:26 shadwick: not necessary, but easy that way 03:45:36 samth: please dont do my homework :( i should have been more clear. at least thats what I wrote so far 03:45:36 samth because a lookup for (fib n) will require all values < n to be computes anyways 03:45:48 so if you use a vector it'll still be contiguous/full 03:45:56 samth: thank you though :) 03:46:08 schemenewb: sorry, didn't realize it was homework 03:46:16 schemenewb: just don't look at that line 03:46:18 samth: yeah i should have been more explicit about that 03:46:34 ill look at it when im done and its working 03:47:19 your function body needs to be some conditional, where you first check the cache, and if it's not there, compute and store it 03:47:32 so that next time for that N, it will be in the cache 03:48:35 shadwick: a hash table is pretty close to your proposed idea. what if I want to compute a the nth fib number for a very large n? a good hash table implementation will take care of that with chaining etc. pp. 03:48:56 schemenewb: yes... 03:49:05 but fibs is a bit special 03:49:16 well im trying to avoid that conditional by using the behavior of hash-ref 03:49:24 how do you compute (fib n) ? (+ (fib (- n 1) (- n 2))) 03:49:33 i.e. all values < n still need to be computed and cached anyways 03:49:37 hence i said a vector was fine 03:49:37 excatly, but this is not a implementation specifically for fib. numbers 03:49:48 oh, I thought this was tailored just to fibs 03:50:09 sorry, i should have been more clear about that 03:58:44 I guess you're right, for the fib. sequence direct addressing should be very fast, although that speed argument is probably beaten by some low level implementation tricks used for the hash table, since our vector implementation relies on scheme's library for very large numbers 04:00:13 I have no idea how the hash table works in Scheme 04:00:15 never used it myself 04:00:33 I just assumed if you need to store n elements from [0 .. n) then you might as well use a vector 04:00:43 instead of hashing and dealing with all that.. 04:01:37 does the hashtable only take fixnums as keys?.. 04:05:32 -!- samth is now known as samth_away 04:06:53 -!- jrslepak [~jrslepak@c-71-233-148-123.hsd1.ma.comcast.net] has quit [Quit: What happened to Systems A through E?] 04:08:02 i think it can map from any value 04:08:04 schemenewb: here's a memoisation macro that works for fib (using hash table) http://www.telegraphics.com.au/svn/puzzles/trunk/quad/ch3_memofib.scm , http://www.telegraphics.com.au/svn/puzzles/trunk/quad/ch3_def.scm 04:08:28 -!- CampinSam [~CampinSam@24-176-98-217.dhcp.jcsn.tn.charter.com] has quit [Quit: leaving] 04:09:31 thats awesome Oo 04:10:06 im still new to all the macros and they are amazing every time 04:10:38 qu1j0t3: so it's adding pattern-matching for the arguments?.. 04:14:38 -!- X-Scale [email@2001:470:1f14:135b::2] has quit [Remote host closed the connection] 04:21:06 -!- pygospa [~Pygosceli@kiel-5f77bae2.pool.mediaWays.net] has quit [Disconnected by services] 04:21:16 pygospa [~Pygosceli@kiel-5f77b9ce.pool.mediaWays.net] has joined #scheme 04:23:49 shadwick: well, it pre-populates the hash table with some seed mappings. it's a refinement of a simpler macro: http://www.telegraphics.com.au/svn/puzzles/trunk/quad/ch2_memoise.scm 04:24:26 jonrafkind [~jon@jonr5.dsl.xmission.com] has joined #scheme 04:25:35 -!- Rekcuflluks is now known as MaximusFrag 04:26:07 I need to learn about these macros at some point haha 04:28:32 The keys of hashes are basically limited by whatever hash function one supplies. 04:28:47 And syntax-case will make you wish you were anencephalic 04:30:39 is there any good references on syntax-case? i've been trying to learn to write some unhygenic macros 04:30:54 arbscht [~arbscht@fsf/member/arbscht] has joined #scheme 04:32:02 Lajla [~Lajla@2001:0:5ef5:79fb:282f:2fd8:ae33:eb94] has joined #scheme 04:32:06 -!- MrFahrenheit [~RageOfTho@users-55-233.vinet.ba] has quit [Ping timeout: 252 seconds] 04:34:06 -!- MaximusFrag [~Lajla@2001:0:5ef5:79fb:c5b:2fd8:ae33:eb94] has quit [Ping timeout: 272 seconds] 04:43:39 bigfg [~b_fin_g@r186-52-167-53.dialup.adsl.anteldata.net.uy] has joined #scheme 04:43:39 -!- bfgun [~b_fin_g@r186-52-138-88.dialup.adsl.anteldata.net.uy] has quit [Read error: Connection reset by peer] 04:44:55 Is there a better way of doing this http://pastebin.com/xCPhBEeq ? 04:45:26 Specifically I don't like the set! statement. 04:51:57 schemenewb, http://pastebin.com/GPZhAwgd is there any e4ason this doesn't work? 04:52:35 (or x y) is just the same as (if x x y) in this case by the way, it just doesn't evaluate x twice, that's the only difference 04:53:56 tomodo [~tomodo@gateway/tor-sasl/tomodo] has joined #scheme 04:54:28 -!- snits [~snits@75-167-2-163.phnx.qwest.net] has quit [Quit: leaving] 04:55:08 i think it doesnt return the value of (f x) if x hasn't been given as an arugment yet, since y is set to a value 04:56:13 Huh 04:56:15 I don't get it. 04:56:17 also y is out of the scope of let 04:56:27 Is it 04:56:28 no it's not. 04:56:33 It is inside 04:56:58 hm ok 04:57:01 Burried inside like the secrets of the true reason of the Iraqi war in the deepest cellars of the pentagon. 04:57:14 well I get "expand: unbound identifier in module in: y" 04:57:21 Using let over define is just a stylistic thing, I like more 04:57:31 Huh 04:57:32 Ohhh 04:57:33 the other one 04:57:36 Yeah that's right 04:57:37 sorry 04:57:50 You need to move a parenthesis I did not see the final y 04:58:21 even then y does not refer to the value of (f x) if x isnt found in the hash table 04:58:31 i think 04:59:16 Yeah, that's true 04:59:21 I did miss your last y. 05:00:31 thanks for the input though :) 05:00:46 http://pastebin.com/vqwQdeWB but like 05:00:50 you just move the problem around like that 05:01:23 Again with the y out of scope though, sorry, I'm terrible 05:01:26 But you get the idea. 05:01:38 yeah I tried using or too, but unfortunately then f isnt evaluated in the right scope for its side effects or something like that 05:02:17 That shouldn't matter with lexical scoping and all that good stuff..? 05:03:00 or isn t that relevant, you can use if, it just duplicates an expression 05:08:27 I really want something like this http://pastebin.com/j46StUan to work 05:08:29 snits [~snits@75-167-2-163.phnx.qwest.net] has joined #scheme 05:10:07 attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has joined #scheme 05:33:35 realitygrill_ [~realitygr@adsl-76-226-124-232.dsl.sfldmi.sbcglobal.net] has joined #scheme 05:35:52 -!- realitygrill [~realitygr@adsl-76-226-129-104.dsl.sfldmi.sbcglobal.net] has quit [Ping timeout: 276 seconds] 05:35:52 -!- realitygrill_ is now known as realitygrill 05:40:11 schemenewb: I quickly rearranged your code but have no idea now what your goal was hahaha 05:40:55 schemenewb: I typed this in pastebin, so definitely double check the parens: http://pastebin.com/n5ycxYhR 05:42:09 well hash-ref evaluates its second argument (if it is a function) given that the first does not evaluate to a previously hashed key. thus i make the second argument be a function, that is supposed to evaluate f with argument x, create a key x with value y and return y 05:43:25 oh I was looking at the first link you pasted 05:43:25 oops 05:44:22 so what's wrong with this one? if it evaluates the lambda argument to hash-ref, does the function not return that computed y? 05:48:29 -!- kudkudyak [~user@94.72.137.15] has quit [Ping timeout: 245 seconds] 05:49:24 djcb [~user@a88-114-95-13.elisa-laajakaista.fi] has joined #scheme 05:49:28 no it does, but it also evaulates f with x, if the key exists 05:49:42 because hash-ref is a function 05:50:12 or something like that. honestly i dont know, i just know I get that behavior. 05:51:26 and that mangled paste I made doesn't work? 05:51:49 -!- adu [~ajr@pool-72-83-26-98.washdc.fios.verizon.net] has quit [Quit: adu] 05:57:05 -!- homie [~levgue@xdsl-78-35-154-53.netcologne.de] has quit [Read error: Connection reset by peer] 06:00:10 homie [~levgue@xdsl-78-35-154-53.netcologne.de] has joined #scheme 06:02:16 Skola_ [~bas@5352A3FB.cm-6-3c.dynamic.ziggo.nl] has joined #scheme 06:06:34 Lajjla [~Lajla@2001:0:5ef5:79fb:100e:2fd8:ae33:eb94] has joined #scheme 06:08:46 shadwick: it probably does, but doesn't provide much more clarity over my working solution http://pastebin.com/xCPhBEeq 06:09:27 although it does avoid a set! 06:09:44 -!- Lajla [~Lajla@2001:0:5ef5:79fb:282f:2fd8:ae33:eb94] has quit [Ping timeout: 272 seconds] 06:12:00 -!- Lajjla is now known as _ttoille 06:12:13 -!- _ttoille is now known as Lajla 06:12:23 -!- Lajla is now known as _ttoille 06:20:49 -!- _ttoille is now known as H_ekiM 06:28:37 the only reason I did was to avoid the set! haha 06:29:32 -!- ozzloy [~ozzloy@unaffiliated/ozzloy] has quit [Read error: Operation timed out] 06:32:28 ozzloy [~ozzloy@ozzloy.lifeafterking.org] has joined #scheme 06:32:40 -!- ozzloy [~ozzloy@ozzloy.lifeafterking.org] has quit [Changing host] 06:32:40 ozzloy [~ozzloy@unaffiliated/ozzloy] has joined #scheme 07:01:09 Operaist2 [~OperaIst@ppp-124-120-220-233.revip2.asianet.co.th] has joined #scheme 07:01:26 is there some sort of set procedure in scheme? 07:03:11 set?? 07:03:27 set??what 07:03:34 -!- H_ekiM [~Lajla@2001:0:5ef5:79fb:100e:2fd8:ae33:eb94] has quit [Ping timeout: 272 seconds] 07:03:56 Operaist2, set! 07:04:08 -!- djcb [~user@a88-114-95-13.elisa-laajakaista.fi] has quit [Remote host closed the connection] 07:05:34 i want to store something in a set 07:05:44 and i woudl like to read some socumentation on other related procedures 07:05:48 for use with my awesome program 07:06:06 do you have any bubble gum to chew while you kick ass 07:09:07 Lajla [~Lajla@2001:0:5ef5:79fb:100e:2fd8:ae33:eb94] has joined #scheme 07:12:11 preflex_ [~preflex@unaffiliated/mauke/bot/preflex] has joined #scheme 07:13:21 well thx for your help 07:13:26 you have been so helpful today 07:13:35 and not being a jerkface smartpants asshole at all 07:13:42 -!- preflex [~preflex@unaffiliated/mauke/bot/preflex] has quit [Ping timeout: 272 seconds] 07:13:43 -!- preflex_ is now known as preflex 07:20:12 -!- Skola_ [~bas@5352A3FB.cm-6-3c.dynamic.ziggo.nl] has quit [Quit: Lost terminal] 07:23:04 -!- jonrafkind [~jon@jonr5.dsl.xmission.com] has quit [Ping timeout: 245 seconds] 07:23:39 forcer [~forcer@hmbg-5f77e160.pool.mediaWays.net] has joined #scheme 07:27:58 -!- dwyer [~dwyer@tsunami.OCF.Berkeley.EDU] has quit [Quit: leaving] 07:28:10 -!- forcer [~forcer@hmbg-5f77e160.pool.mediaWays.net] has quit [Ping timeout: 260 seconds] 07:28:24 -!- Lajla is now known as maesuanda 07:29:44 -!- Skola [~bas@5352A3FB.cm-6-3c.dynamic.ziggo.nl] has quit [Ping timeout: 245 seconds] 07:34:27 shadwick: I guess it is a tradeoff between set and more lines. Thanks for the input though! 07:34:35 Everyone thanks for your help, have a good one! 07:38:23 Operaist2: google "racket set", first link "http://docs.racket-lang.org/reference/sets.html" for a description of mathematical sets in racket. If you're looking for mutation (i.e. set! and the like) google "racket assignment" and you'll find this (third link) http://docs.racket-lang.org/guide/set_.html . On another note, your inital question was very imprecise. A "set procedure" could mean both of those and possibly more things. 07:40:20 -!- schemenewb [63e70dd8@gateway/web/freenode/ip.99.231.13.216] has quit [Quit: Page closed] 07:42:08 -!- maesuanda [~Lajla@2001:0:5ef5:79fb:100e:2fd8:ae33:eb94] has quit [Ping timeout: 245 seconds] 07:42:09 forcer [~forcer@hmbg-5f77ce60.pool.mediaWays.net] has joined #scheme 07:43:51 asdfhjkl [~bob@i5E879AE1.versanet.de] has joined #scheme 07:45:00 cdidd [~cdidd@95-27-162-253.broadband.corbina.ru] has joined #scheme 07:48:10 hkBst [~marijn@gentoo/developer/hkbst] has joined #scheme 07:51:19 -!- virl [~virl__@85-127-158-77.dynamic.xdsl-line.inode.at] has quit [Remote host closed the connection] 07:56:08 gravicappa [~gravicapp@ppp91-77-191-242.pppoe.mtu-net.ru] has joined #scheme 07:57:15 bas_ [~bas@89.184.179.185] has joined #scheme 07:57:15 -!- bas_ is now known as Skola 07:57:38 -!- realitygrill [~realitygr@adsl-76-226-124-232.dsl.sfldmi.sbcglobal.net] has quit [Remote host closed the connection] 08:04:47 -!- attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has quit [Quit: Leaving.] 08:13:17 djcb [djcb@nat/nokia/x-zakpmjykxakjrjmv] has joined #scheme 08:19:34 attila_lendvai [~attila_le@87.247.47.44] has joined #scheme 08:19:34 -!- attila_lendvai [~attila_le@87.247.47.44] has quit [Changing host] 08:19:34 attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has joined #scheme 08:21:12 -!- gravicappa [~gravicapp@ppp91-77-191-242.pppoe.mtu-net.ru] has quit [Ping timeout: 244 seconds] 08:36:25 -!- tuubow_ [~adityavit@c-69-136-105-164.hsd1.nj.comcast.net] has quit [Ping timeout: 260 seconds] 08:42:57 ahinki [~chatzilla@212.99.10.150] has joined #scheme 08:43:40 gravicappa [~gravicapp@ppp91-77-222-130.pppoe.mtu-net.ru] has joined #scheme 08:55:12 wingo [~wingo@90.164.198.39] has joined #scheme 09:01:16 -!- bipt [~bpt@cpe-071-070-253-241.nc.res.rr.com] has quit [Ping timeout: 276 seconds] 09:06:34 rixed [~rixed@extranet.securactive.org] has joined #scheme 09:18:04 add^_ [~add^_^@m90-141-45-95.cust.tele2.se] has joined #scheme 09:21:31 -!- wingo [~wingo@90.164.198.39] has quit [Ping timeout: 252 seconds] 09:43:21 kpal [~kpal@janus-nat-128-240-225-120.ncl.ac.uk] has joined #scheme 10:00:31 tuubow_ [~adityavit@c-69-136-105-164.hsd1.nj.comcast.net] has joined #scheme 10:05:03 -!- joast [~rick@98.145.91.18] has quit [Ping timeout: 244 seconds] 10:20:17 -!- twem2 [~tristan@puma-mxisp.mxtelecom.com] has quit [Remote host closed the connection] 10:23:18 twem2 [~tristan@puma-mxisp.mxtelecom.com] has joined #scheme 10:35:52 -!- Skola [~bas@89.184.179.185] has quit [Quit: Lost terminal] 10:38:19 bas_ [~bas@89.184.179.185] has joined #scheme 10:38:37 -!- bas_ is now known as Skola 10:38:56 rostayob [~rostayob@host86-137-12-68.range86-137.btcentralplus.com] has joined #scheme 10:41:50 -!- tuubow_ [~adityavit@c-69-136-105-164.hsd1.nj.comcast.net] has quit [Ping timeout: 260 seconds] 10:54:34 -!- shadwick is now known as shadwick_away 11:01:33 -!- attila_lendvai [~attila_le@unaffiliated/attila-lendvai/x-3126965] has quit [Quit: Leaving.] 11:04:48 -!- Operaist2 [~OperaIst@ppp-124-120-220-233.revip2.asianet.co.th] has quit [Quit: ChatZilla 0.9.88 [Firefox 10.0.2/20120216101208]] 11:11:25 -!- xwl_ [user@nat/nokia/x-pkjwxnnvrmpmdwzg] has quit [Read error: Connection reset by peer] 11:13:54 -!- shadwick_away [~erik@S01060026f395c2b7.vc.shawcable.net] has quit [Quit: Leaving] 11:40:37 teiresias [~teiresias@archlinux/trusteduser/teiresias] has joined #scheme 11:47:23 gremmachook [u1735@gateway/web/irccloud.com/x-nnwugrhqhrmjfjso] has joined #scheme 11:48:25 soveran [~soveran@186.19.214.247] has joined #scheme 12:04:24 Hi, I am trying to define a Graph ADT. I can imagine this being a list of procedures, that take a Graph G and perform any operation. For example, (add-edge G u v w) would add an edge from u to v of weight w. However, I'm having trouble forming a (make-graph) initialization procedure. I can imagine starting with a '(), or an empty graph. Is my formation of this ADT correct? Or am I missing somethin 12:04:25 g? 12:04:50 Depends on the representation you choose. 12:05:07 (make-graph) --> an empty graph. 12:05:22 an empty graph can be whatever you like. 12:06:34 What's convenient, is to use a structure. Notably because that gives you a definite type for your graph, so you can have a graph? predicatet that's exclusive to the other type predicates. 12:07:30 -!- Nshag [user@chl45-1-88-123-84-8.fbx.proxad.net] has quit [Ping timeout: 244 seconds] 12:08:41 Nshag [user@chl45-1-88-123-84-8.fbx.proxad.net] has joined #scheme 12:10:03 pjb: In imperative languages, ADT's were typically functions bundled in classes. Is there something in Scheme that allows me to encapsulate? 12:10:25 Yes, but it's not worth the work. 12:10:49 pjb: I found this Queue ADT - http://www.cs.grinnell.edu/~walker/courses/151.sp04/readings/queues.xhtml 12:11:05 You could write macros to define all your "methods" in a single form. You could implement a OO system. Or you could fetch a OO system library. 12:11:15 It's implemented more like a C++/Java class. 12:12:46 Does this make sense? (define (make-graph) '()) and then to create a graph G, I could say (define G (make-graph)), where G results in an empty adjacency list. 12:13:51 -!- rostayob [~rostayob@host86-137-12-68.range86-137.btcentralplus.com] has quit [Quit: WeeChat 0.3.5] 12:15:05 Yes, you could do that. closures are equivalent to classes. 12:15:28 (list? (make-graph)) --> #t doesn't make sense. A graph is not a list. 12:15:54 adjacency lists are not graph. They can be used to _represent_ a graph. 12:16:07 But other representations are possible. This should be abstracted away. 12:16:55 pjb: well, an adjacency list will be a list of lists won't it? 12:17:57 -!- metasyntax|work [~taylor@fw-its-kt209a-2.dyn.ipfw.edu] has quit [Ping timeout: 248 seconds] 12:18:38 If you have the time, could you write down a stub? I'm having a 12:18:44 hard time visualizing this. 12:21:05 Well the problem is that defstruct is not in r5rs. But check the documentation of your scheme implementation. 12:21:39 See also http://srfi.schemers.org/srfi-9/srfi-9.html 12:22:51 MIT Scheme has define-structure. 12:31:55 metasyntax|work [~taylor@fw-its-kt209a-2.dyn.ipfw.edu] has joined #scheme 12:37:30 samth [~samth@c-66-31-201-165.hsd1.ma.comcast.net] has joined #scheme 13:05:46 tupi [~david@139.82.89.24] has joined #scheme 13:08:22 homie` [~levgue@xdsl-78-35-155-72.netcologne.de] has joined #scheme 13:10:46 -!- homie [~levgue@xdsl-78-35-154-53.netcologne.de] has quit [Ping timeout: 248 seconds] 13:15:07 langmartin [~user@host-68-169-155-216.WISOLT2.epbfi.com] has joined #scheme 13:43:04 -!- _schulte_ [~eschulte@c-174-56-50-60.hsd1.nm.comcast.net] has quit [Ping timeout: 246 seconds] 13:45:52 jrslepak [~jrslepak@c-71-233-148-123.hsd1.ma.comcast.net] has joined #scheme 14:06:10 -!- gremmachook [u1735@gateway/web/irccloud.com/x-nnwugrhqhrmjfjso] has left #scheme 14:06:58 joast [~rick@98.145.85.206] has joined #scheme 14:18:09 rostayob 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