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k-list m)) (shift k (k k)))) why get error: ERROR: In procedure map: Wrong type argument: (#:66:73 vals>) 2015-12-27T14:48:24Z ec joined #scheme 2015-12-27T14:50:51Z emma joined #scheme 2015-12-27T14:50:51Z emma quit (Changing host) 2015-12-27T14:50:51Z emma joined #scheme 2015-12-27T14:50:59Z cjh` joined #scheme 2015-12-27T14:58:50Z zbigniew quit (Ping timeout: 246 seconds) 2015-12-27T15:18:57Z ggole__ joined #scheme 2015-12-27T15:19:33Z ggole_ quit (Ping timeout: 265 seconds) 2015-12-27T15:20:46Z Riastradh quit (Ping timeout: 240 seconds) 2015-12-27T15:23:54Z amca quit (Remote host closed the connection) 2015-12-27T15:27:22Z jusss quit (Quit: ERC (IRC client for Emacs 24.5.1)) 2015-12-27T15:28:08Z xwl joined #scheme 2015-12-27T15:31:51Z pierpa joined #scheme 2015-12-27T15:36:04Z boycottg00gle joined #scheme 2015-12-27T15:37:09Z boycottg00gle left #scheme 2015-12-27T15:38:05Z wildlander joined #scheme 2015-12-27T15:38:05Z wildlander quit (Max SendQ exceeded) 2015-12-27T15:38:45Z 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timeout: 240 seconds) 2015-12-27T21:10:24Z nilg quit (Read error: Connection reset by peer) 2015-12-27T21:32:18Z xwl quit (Remote host closed the connection) 2015-12-27T21:38:28Z fantazo joined #scheme 2015-12-27T21:42:58Z Necrosporus_ joined #scheme 2015-12-27T21:43:27Z Necrosporus quit (Disconnected by services) 2015-12-27T21:43:31Z Necrosporus_ is now known as Necrosporus 2015-12-27T21:47:58Z untrusted joined #scheme 2015-12-27T21:48:42Z physixer joined #scheme 2015-12-27T21:48:49Z untrusted quit (Remote host closed the connection) 2015-12-27T21:50:30Z physixer: after reading about foldl, and foldr, consider this example: I have a (list "a" "b" "c" "d") and I want output: "a+b+c+d". This looks like neither "left" fold or "right" fold, but more like "in" fold. 2015-12-27T21:50:42Z physixer: Similarly, if I want "|a|b|c|d 2015-12-27T21:50:57Z physixer: sorry "|a|b|c|d|", this is more like "out" fold. 2015-12-27T21:51:47Z physixer: can I construct infold and outfold from foldl and foldr, or are the all at the same level of abstraction (one can't necessarily be reduced into the other) 2015-12-27T22:01:07Z Regulator_ joined #scheme 2015-12-27T22:01:40Z Regulator9 quit (Ping timeout: 272 seconds) 2015-12-27T22:03:23Z fantazo quit (Quit: Verlassend) 2015-12-27T22:21:21Z pjb: physixer: left fold is (((a+b)+c)+d); right fold is (a+(b+(c+d))) 2015-12-27T22:21:32Z pjb: physixer: aren't they equivalent to a+b+c+d? 2015-12-27T22:21:48Z pjb: physixer: where is the mathematical definition of a+b+c+d? A function of 4 arguments??? 2015-12-27T22:22:04Z dpk: fold-left vs fold-right only matters if your reduction procedure is non-commutative 2015-12-27T22:22:21Z pjb: non associative you mean? 2015-12-27T22:22:47Z dpk: err, yes 2015-12-27T22:25:33Z failproofshark quit (Remote host closed the connection) 2015-12-27T22:38:25Z oldskirt quit (Ping timeout: 265 seconds) 2015-12-27T22:43:40Z physixer: well foldl and foldr require providing a base case, infold doesn't require a base case. 2015-12-27T22:45:41Z pjb: physixer: (define (infold fun list) (foldl fun (cdr list) (car list))) 2015-12-27T22:45:59Z pjb: Doesn't seem worthy of a PhD. 2015-12-27T22:46:22Z physixer: pjb: technically right fold is (a+(b+(c+(d+X)))) where X is base case 2015-12-27T22:54:28Z pjb: physixer: ok. in CL reduce doesn't use X when there are at least 2 elements in the sequence. 2015-12-27T22:55:02Z pjb: Well, no. 2015-12-27T22:55:53Z pjb: It depends if it's given or not, and needed or not. The function may be called with 0 or 2 arguments, in CL (+) -> 0 and (*) -> 1 for those cases. 2015-12-27T22:56:26Z pjb: (reduce 'list '()) #| --> nil |# (reduce 'list '() :initial-value 'empty) #| --> empty |# 2015-12-27T22:56:52Z oleo_: https://www.youtube.com/watch?v=9tplRbd-fso 2015-12-27T22:56:54Z pjb: (reduce 'list '(1)) #| --> 1 notice, list not called! |# (reduce 'list '(1) :initial-value 'empty) #| --> (empty 1) |# 2015-12-27T22:57:52Z pjb: oleo_: interesting; but for #lispcafe no? 2015-12-27T22:59:21Z oleo_: no it's not only interesting..... it's a must........ 2015-12-27T22:59:36Z oleo_: :) 2015-12-27T22:59:47Z oleo_: ☺ christmas to you too pjb 2015-12-27T23:04:38Z ineiros quit (Ping timeout: 246 seconds) 2015-12-27T23:05:38Z XTL quit (Ping timeout: 272 seconds) 2015-12-27T23:06:42Z XTL joined #scheme 2015-12-27T23:09:31Z oldskirt joined #scheme 2015-12-27T23:09:44Z mmc quit (Ping timeout: 255 seconds) 2015-12-27T23:13:12Z ineiros joined #scheme 2015-12-27T23:23:00Z oldskirt_ joined #scheme 2015-12-27T23:25:47Z davexunit joined #scheme 2015-12-27T23:25:56Z oldskirt quit (Ping timeout: 255 seconds) 2015-12-27T23:27:11Z tmtwd quit (Ping timeout: 264 seconds) 2015-12-27T23:27:23Z oldskirt_ quit (Ping timeout: 246 seconds) 2015-12-27T23:33:15Z oldskirt joined #scheme 2015-12-27T23:34:19Z teurastaja joined #scheme 2015-12-27T23:34:57Z teurastaja: example using setjmp/longjmp to implement continuations? 2015-12-27T23:38:59Z pjb: No exactamente. continuations make the stack a tree, not setjmp/longjmp. 2015-12-27T23:39:22Z pjb: So if you call setjmp and return from the function that called it, you cannot call longjmp to it anymore. 2015-12-27T23:39:43Z Regulator9 joined #scheme 2015-12-27T23:42:22Z Regulator_ quit (Ping timeout: 272 seconds) 2015-12-27T23:44:41Z Beluki quit (Quit: Beluki) 2015-12-27T23:46:20Z oldskirt quit (Read error: Connection reset by peer) 2015-12-27T23:51:42Z oldskirt joined #scheme 2015-12-27T23:53:53Z mumptai quit (Quit: Verlassend) 2015-12-27T23:55:44Z personp joined #scheme