August 2002 - Haskell-Cafe

aide SVP
by fouad ktiri 30 Aug '02

30 Aug '02

Bonjour, Comment faire pour stocker des données dans une liste comme en programmation normale (x=x+1) Merci beaucoup ______________________________________________________ Boîte aux lettres - Caramail - http://www.caramail.com

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help
by yan zhong 30 Aug '02

30 Aug '02

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RE: Question aboutthe use of an inner forall
by Simon Peyton-Jones 30 Aug '02

30 Aug '02

Now fixed in the 5.04 branch. The fix will get into the HEAD when I merge in the Template Haskell stuff. Thanks for the report Simon | -----Original Message----- | From: Simon Peyton-Jones [mailto:simonpj@microsoft.com] | Sent: 28 August 2002 12:21 | To: Ashley Yakeley | Cc: Haskell Cafe List | Subject: RE: Question aboutthe use of an inner forall | | | No, this is a bug, thank you. Will fix. | | Simon | | | -----Original Message----- | | From: Ashley Yakeley [mailto:ashley@semantic.org] | | Sent: 19 August 2002 11:31 | | To: Jay Cox; Haskell Cafe List | | Subject: Re: Question aboutthe use of an inner forall | | | | | | At 2002-08-18 20:19, Jay Cox wrote: | | | | >#ST> runST (newSTRef (3::Prelude.Int)) | | ># | | >#Ambiguous type variable(s) `a' in the constraint `PrelShow.Show a' | | >#arising from use of `PrelIO.print' at <No locn> #In a 'do' | | expression | | >pattern binding: PrelIO.print it | | | | I don't understand this either, actually: | | | | $ ghci -fglasgow-exts -package lang | | ___ ___ _ | | / _ \ /\ /\/ __(_) | | / /_\// /_/ / / | | GHC Interactive, version 5.04, | | for Haskell | | 98. | | / /_\\/ __ / /___| | http://www.haskell.org/ghc/ | | \____/\/ /_/\____/|_| Type :? for help. | | | | Loading package base ... linking ... done. | | Loading package haskell98 ... linking ... done. | | Loading package lang ... linking ... done. | | Prelude> :module ST | | Prelude ST> :type runST | | | | Inferred type is less polymorphic than expected | | Quantified type variable `s' escapes | | Expected type: ST s a -> t | | Inferred type: (forall s1. ST s1 a) -> a | | Prelude ST> | | | | What's up with that? Can't I even look at the type? Is this the | | monomorphism restriction or something? | | | | -- | | Ashley Yakeley, Seattle WA | | | | _______________________________________________ | | Haskell-Cafe mailing list | | Haskell-Cafe(a)haskell.org | | http://www.haskell.org/mailman/listinfo/haskell-cafe | | | _______________________________________________ | Haskell-Cafe mailing list | Haskell-Cafe(a)haskell.org | http://www.haskell.org/mailman/listinfo/haskell-cafe |

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Say�n haskell-cafe ,
by Green Card 29 Aug '02

29 Aug '02

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RE: Question aboutthe use of an inner forall
by Simon Peyton-Jones 28 Aug '02

28 Aug '02

No, this is a bug, thank you. Will fix. Simon | -----Original Message----- | From: Ashley Yakeley [mailto:ashley@semantic.org] | Sent: 19 August 2002 11:31 | To: Jay Cox; Haskell Cafe List | Subject: Re: Question aboutthe use of an inner forall | | | At 2002-08-18 20:19, Jay Cox wrote: | | >#ST> runST (newSTRef (3::Prelude.Int)) | ># | >#Ambiguous type variable(s) `a' in the constraint `PrelShow.Show a' | >#arising from use of `PrelIO.print' at <No locn> #In a 'do' | expression | >pattern binding: PrelIO.print it | | I don't understand this either, actually: | | $ ghci -fglasgow-exts -package lang | ___ ___ _ | / _ \ /\ /\/ __(_) | / /_\// /_/ / / | | GHC Interactive, version 5.04, | for Haskell | 98. | / /_\\/ __ / /___| | http://www.haskell.org/ghc/ | \____/\/ /_/\____/|_| Type :? for help. | | Loading package base ... linking ... done. | Loading package haskell98 ... linking ... done. | Loading package lang ... linking ... done. | Prelude> :module ST | Prelude ST> :type runST | | Inferred type is less polymorphic than expected | Quantified type variable `s' escapes | Expected type: ST s a -> t | Inferred type: (forall s1. ST s1 a) -> a | Prelude ST> | | What's up with that? Can't I even look at the type? Is this the | monomorphism restriction or something? | | -- | Ashley Yakeley, Seattle WA | | _______________________________________________ | Haskell-Cafe mailing list | Haskell-Cafe(a)haskell.org | http://www.haskell.org/mailman/listinfo/haskell-cafe |

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N queens problem
by Jonata Goulart 25 Aug '02

25 Aug '02

This is the problem to figure out the n queens problem but I didn't understand it very well. Somebody can help me ? how legal and queens functions work? attack (l,c) (ll,cc) = l ==ll || (l+c==ll+cc) || (l-c==ll-cc) legal p m = and [not (attack (l,c) (m, length p +1)) | (l,c) <- zip p [1..]] queens n = r n n where r 0 n = [[]] r m n = [p ++ [m] | p <- r (m-1) n, m <-[1..n], legal p m] _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

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Reklam Vermek ��in Servet �demeyin
by info 24 Aug '02

24 Aug '02

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Re: Videolar�m - 3
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22 Aug '02

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OT: broken mail threads
by Lauri Alanko 22 Aug '02

22 Aug '02

I'm sorry to bring up such petty issues, but this has been nagging me for quite a long while now... The Haskell mailing lists have one rather unflattering characteristic: their mail threads are almost always broken. I'll elaborate. Most mail user agents arrange messages in threads, keeping track of which message is a reply to which. The programs use the In-Reply-To: and References: -headers of the messages for this. By some coincidence, the various Haskell mailing lists have an uncommonly high proportion of replies which do not have these headers. As a result, many followup messages show up as a new thread in the unlucky reader's mail program, and this makes following a discussion more inconvenient. This also affects web archives of the mailing lists. The reason for these lacking headers is most likely faulty mail programs. Since programs are at fault here, not people, I won't mention names, but will simply identify the most common broken user agents. X-Mailer: Claris Emailer 2.0v3, January 22, 1998 (No threading information of any kind) X-Mimeole: Produced By Microsoft Exchange V6.0.6249.0 (Does have some very non-standard Thread-Topic: and Thread-Index: -headers, but no In-Reply-To: or References:) User-Agent: slrn/0.9.7.4 (Linux) (Apparently via a mail-news -gateway. Replies do have a References: -header, but with locally generated message-ids instead of the real ones.) There are also other messages with threading problems, but these are by far the most common sources. If you find yourself using one of these programs, could you please check your configuration or maybe consider switching to a more well-behaving user agent? This would make your messages much easier to follow. Thanks. Lauri Alanko la(a)iki.fi

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Re: Leical and syntactic analyzer
by Jon Cast 22 Aug '02

22 Aug '02

Jonata Goulart <jonatahh(a)hotmail.com> wrote: > Does somebody know where can I find an example of a lexical and > syntactic analyzer for arithmetic and conditional statements > in Haskell? > Thanks hslibs/hssource in the ghc source (<http://www.haskell.org/ghc/dist/5.04/ghc-5.04-src.tar.bz2>). Jon Cast

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