Re: [Haskell-cafe] haskellwiki and Project Euler
2008/2/24, Daniel Fischer <[EMAIL PROTECTED]>: > Hi all, > I try not to be too rude, although I'm rather disgusted. > I know there are several sites out on the web where solutions to PE problems > are given. That is of course absolutely against the sporting spirit of > Project Euler, Actually, I've found this solutions pretty usefull. After I solved another PE problem I went there to find out how newbie I still was! And I've learned really huge amout of usefull stuff. In fact, I've put my own solution there because the one that was already on site was crappy against my newbie stuff. I hope it will be helpfull to someone else. If you are afraid about spoiling "sport spirit" of PE by someone that just copies the solution then you are naive. Just google for answer. If you are in compete with someone on PE I'm sure that if he doesn't want to be fair then he won't be fair and removing this site won't help it. Another issue is submitting someone else's code. This would anger me personally a lot! If you have evidence of such behaviour then I would vote for removing the suspected stuff immiedietly. Cheers, Radek. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
Hello, It seems that I'm getting sucked into this argument solely due to my unwillingness to allow people to damage useful content that has been added to the Haskell wiki. This started a couple of weeks ago when a user by the name Marypoppins decided to arbitrarily remove all the Euler Problems solutions from the wiki. I treated this as vandalism and immediately reverted all the changes. I'd like to state up front that I otherwise have no personal stake in this, since the solutions pages are not ones that I've made significant contributions to, nor have I even spent a significant amount of time working on Project Euler problems. (They have not enough universal quantifiers in them for my tastes.) I do however, think it's important to not allow valid contributions to the wiki to be damaged by people without good reason. On 23/02/2008, Daniel Fischer <[EMAIL PROTECTED]> wrote: > Hi all, > I try not to be too rude, although I'm rather disgusted. > I know there are several sites out on the web where solutions to PE problems > are given. That is of course absolutely against the sporting spirit of > Project Euler, but hey, not all people are sporting. > I've found http://www.haskell.org/haskellwiki/Euler_problems irritating for a > while, but wasn't overly annoyed by it while it only contained code for > solving a few dozen problems. > Today I learnt that it now contains code for all problems. > Really bad! Why is this even the least bit bad? If you publish a bunch of problems, expect people to publish a bunch of solutions to them. They will do this regardless of what you demand, since there's educational value to others in doing so. If you're running a contest and you don't want people to be able to look up all the solutions, then simply produce a bunch of problems to which nobody has the solution, and make them available all at once, with a time limit on solving them. If you want to see how this is done correctly, have a look at what the ICFP does. If Project Euler is instead, not a contest, as people on the Talk pages on the wiki have claimed, then nobody should have any problem with publishing solutions, as the only person one could possibly cheat by looking up the solution is oneself. However, if one had already given up on solving said problem, then there would likely be significant educational value in reading a solution to it. > On top of that, the code for many problems isn't even Haskell, but C, WTF! This indeed is a problem, as it is the Haskell wiki after all. However, I feel that it's more valuable to keep such solutions until such time as their Haskell counterparts are made available. > Other code was submitted without consent of the author, copied from the PE > fora, which are restricted access and so, even if perhaps not legally, but in > spirit, do not fall under the legitimate resources for haskellwiki: > "You are also promising us that you wrote this yourself, or copied it from a > public domain or similar free resource. DO NOT SUBMIT COPYRIGHTED WORK > WITHOUT PERMISSION!" This is a legitimate concern. If the copyright of the original authors can be proved, said solutions should indeed be removed. However, any claim that the content as a whole, or the list of numeric solutions violates the copyright of PE is clearly ridiculous. The problem statements do not appear on the wiki, and the exact solutions, even if PE were to publish them (that list doesn't appear to be anywhere on the PE site), clearly qualifies as fair use. > To make matters worse still, there was a page containing nothing but the > answers. That was changed, but Cale chose to reintroduce that crap. > I just removed it again. Your turn, Cale. I will not tolerate people coming along and arbitrarily blanking pages for inappropriate reasons like this. Sorry. Such a list of solutions would be useful to someone working on the problems, as a fast way to check their solutions, for instance. It doesn't harm people wanting to solve the problems on their own, as they can simply avoid looking at it. > I call on the Haskell community to vote for immediate removal of these pages > from the wiki! > Show that you're a sporting bunch. I call for the opposite. Sorry. - Cale ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Binary IEEE floating point format for AMQP
I'm working on an implementation of the framing layer for AMQP (www.amqp.org). I almost had 0.9 finished when I found they had released the spec for 0.10, so I have to redo quite a lot of work. Amongst the new features of 0.10 are wire formats for floating point. These are the 4 and 8 byte IEEE formats. * Is there a principled way of converting a Haskell Float or Double (or Rational, for that matter) to and from IEEE format? * Since many computers use IEEE format natively, is there a quicker way of doing this on those architectures? Paul. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
Am Sonntag, 24. Februar 2008 11:37 schrieb Cale Gibbard: > Hello, > > It seems that I'm getting sucked into this argument solely due to my > unwillingness to allow people to damage useful content that has been > added to the Haskell wiki. I'm sorry, I was angry that someone posted my code on that page and over-reacted. I apologize. > > This started a couple of weeks ago when a user by the name Marypoppins > decided to arbitrarily remove all the Euler Problems solutions from > the wiki. I treated this as vandalism and immediately reverted all the > changes. > > I'd like to state up front that I otherwise have no personal stake in > this, since the solutions pages are not ones that I've made > significant contributions to, nor have I even spent a significant > amount of time working on Project Euler problems. (They have not > enough universal quantifiers in them for my tastes.) > > I do however, think it's important to not allow valid contributions to > the wiki to be damaged by people without good reason. Agreed, and the page with the code may indeed be considered a valid contribution. However, it certainly would be more valuable if it wasn't bare code, but also included explanations of the mathematical or programmatical ideas behind it. The page with just the answers I cannot but find worthless. > Why is this even the least bit bad? If you publish a bunch of > problems, expect people to publish a bunch of solutions to them. They > will do this regardless of what you demand, since there's educational > value to others in doing so. The educational value would be more visible if the code was explained, but okay. > If Project Euler is instead, not a contest, as people on the Talk > pages on the wiki have claimed, then nobody should have any problem > with publishing solutions, as the only person one could possibly cheat > by looking up the solution is oneself. However, if one had already > given up on solving said problem, then there would likely be > significant educational value in reading a solution to it. > > > On top of that, the code for many problems isn't even Haskell, but C, > > WTF! > > This indeed is a problem, as it is the Haskell wiki after all. > However, I feel that it's more valuable to keep such solutions until > such time as their Haskell counterparts are made available. I disagree, more valuable would be an explanation of the ideas behind it, and perhaps contrasting a C (python,...) programme with a Haskell one to highlight the different approaches. > > > Other code was submitted without consent of the author, copied from the > > PE fora, which are restricted access and so, even if perhaps not legally, > > but in spirit, do not fall under the legitimate resources for > > haskellwiki: "You are also promising us that you wrote this yourself, or > > copied it from a public domain or similar free resource. DO NOT SUBMIT > > COPYRIGHTED WORK WITHOUT PERMISSION!" > > This is a legitimate concern. If the copyright of the original authors > can be proved, said solutions should indeed be removed. PE has a share-alike license, the very least to be demanded if someone posts other's code is proper attribution. Daniel ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
On Sun, 24 Feb 2008, Daniel Fischer wrote: > Agreed, and the page with the code may indeed be considered a valid > contribution. However, it certainly would be more valuable if it wasn't bare > code, but also included explanations of the mathematical or programmatical > ideas behind it. > > The page with just the answers I cannot but find worthless. > As this is a wiki we're talking about, feel free to add content? Taking things off it because they're not everything you want them to be is definitely not appropriate, and "not valuable enough yet" generally has little place in discussions about whether content belongs. -- [EMAIL PROTECTED] "I think you mean Philippa. I believe Phillipa is the one from an alternate universe, who has a beard and programs in BASIC, using only gotos for control flow." -- Anton van Straaten on Lambda the Ultimate ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
The only time I have found the solutions page useful is when I was working on problem 100, which I'd been thinking about on and off for several months. Eventually, I gave up and looked at the solution there, and was absolutely none the wiser as to how it was solved! I thought about it more over the next few months, and eventually just copied and ran that program, put it into PE, and looked at the forum, and finally understood how I should have solved the problem. Without the solutions page, I would probably never have been able to solve the problem, and would know even less about Diophantine Equations than I currently do. However, the only value was the actual numerical solution, since when I have solved a problem myself and want to see if my answer could be improved, I just look in the forum where I can see a range of methods of solution instead of just one. That said, I vote to keep the solutions (providing they are written by the page editor) since IMO they do no harm. On 24/02/2008, Daniel Fischer <[EMAIL PROTECTED]> wrote: > > Am Sonntag, 24. Februar 2008 11:37 schrieb Cale Gibbard: > > > Hello, > > > > It seems that I'm getting sucked into this argument solely due to my > > unwillingness to allow people to damage useful content that has been > > added to the Haskell wiki. > > > I'm sorry, I was angry that someone posted my code on that page and > over-reacted. I apologize. > > > > > > This started a couple of weeks ago when a user by the name Marypoppins > > decided to arbitrarily remove all the Euler Problems solutions from > > the wiki. I treated this as vandalism and immediately reverted all the > > changes. > > > > I'd like to state up front that I otherwise have no personal stake in > > this, since the solutions pages are not ones that I've made > > significant contributions to, nor have I even spent a significant > > amount of time working on Project Euler problems. (They have not > > enough universal quantifiers in them for my tastes.) > > > > I do however, think it's important to not allow valid contributions to > > the wiki to be damaged by people without good reason. > > > Agreed, and the page with the code may indeed be considered a valid > contribution. However, it certainly would be more valuable if it wasn't > bare > code, but also included explanations of the mathematical or programmatical > ideas behind it. > > The page with just the answers I cannot but find worthless. > > > > > Why is this even the least bit bad? If you publish a bunch of > > problems, expect people to publish a bunch of solutions to them. They > > will do this regardless of what you demand, since there's educational > > value to others in doing so. > > > The educational value would be more visible if the code was explained, but > okay. > > > > If Project Euler is instead, not a contest, as people on the Talk > > pages on the wiki have claimed, then nobody should have any problem > > with publishing solutions, as the only person one could possibly cheat > > by looking up the solution is oneself. However, if one had already > > given up on solving said problem, then there would likely be > > significant educational value in reading a solution to it. > > > > > On top of that, the code for many problems isn't even Haskell, but C, > > > WTF! > > > > This indeed is a problem, as it is the Haskell wiki after all. > > However, I feel that it's more valuable to keep such solutions until > > such time as their Haskell counterparts are made available. > > > I disagree, more valuable would be an explanation of the ideas behind it, > and > perhaps contrasting a C (python,...) programme with a Haskell one to > highlight the different approaches. > > > > > > > Other code was submitted without consent of the author, copied from > the > > > PE fora, which are restricted access and so, even if perhaps not > legally, > > > but in spirit, do not fall under the legitimate resources for > > > haskellwiki: "You are also promising us that you wrote this yourself, > or > > > copied it from a public domain or similar free resource. DO NOT SUBMIT > > > COPYRIGHTED WORK WITHOUT PERMISSION!" > > > > This is a legitimate concern. If the copyright of the original authors > > can be proved, said solutions should indeed be removed. > > > PE has a share-alike license, the very least to be demanded if someone > posts > other's code is proper attribution. > > > Daniel > > > ___ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
On 24/02/2008, Daniel Fischer <[EMAIL PROTECTED]> wrote: > Am Sonntag, 24. Februar 2008 11:37 schrieb Cale Gibbard: > > This is a legitimate concern. If the copyright of the original authors > > can be proved, said solutions should indeed be removed. > > PE has a share-alike license, the very least to be demanded if someone posts > other's code is proper attribution. > To clarify, everything on the wiki is implicitly published under a simple permissive license which is avilable here: http://haskell.org/haskellwiki/HaskellWiki:Copyrights If code cannot be made available under that license, it indeed should be removed. - Cale ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell + Windows Mobile?
Bulat Ziganshin wrote: > is there any haskell implementation for Windows Mobile? does they are > support creation of GUI apps and internet networking features? CeGCC (http://cegcc.sourceforge.net/) is a cross compiler for Windows CE, so it's possible to port GHC to Windows Mobile with some effort. But for GUI applications i personally would use C# and Microsoft's development tools. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
On Sun, 24 Feb 2008, Daniel Fischer wrote: > b) posting C/C++ code there indicates that the reason for that is to be a > spoil-sport, not to further learning/thinking Haskell. > No, it doesn't. It provides code that people can port - an obvious step in building a more complete wiki page. -- [EMAIL PROTECTED] "The reason for this is simple yet profound. Equations of the form x = x are completely useless. All interesting equations are of the form x = y." -- John C. Baez ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
On Sun, 24 Feb 2008, Daniel Fischer wrote: > Hi all, > I try not to be too rude, although I'm rather disgusted. > I know there are several sites out on the web where solutions to PE problems > are given. That is of course absolutely against the sporting spirit of > Project Euler, but hey, not all people are sporting. What sporting spirit? The site itself doesn't indicate any such thing whatsoever and doesn't ask that people don't post solutions - as such, anything you have to say here is entirely about the culture on the forums there, not the problem set itself. As such, you've taken it upon yourself to enforce the spirit of your PE participation upon others. That's far from sporting and in direct violation of the spirit of the wiki. Let people play how they choose. > Other code was submitted without consent of the author Can you demonstrate this? A statement from the author that they didn't consent, for example? -- [EMAIL PROTECTED] 'In Ankh-Morpork even the shit have a street to itself... Truly this is a land of opportunity.' - Detritus, Men at Arms ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
2008/2/24, Rodrigo Queiro <[EMAIL PROTECTED]>: > The only time I have found the solutions page useful is when I was working > on problem 100, which I'd been thinking about on and off for several months. > Eventually, I gave up and looked at the solution there, and was absolutely > none the wiser as to how it was solved! I thought about it more over the > next few months, and eventually just copied and ran that program, put it > into PE, and looked at the forum, and finally understood how I should have > solved the problem. > > Without the solutions page, I would probably never have been able to solve > the problem, and would know even less about Diophantine Equations than I > currently do. However, the only value was the actual numerical solution, > since when I have solved a problem myself and want to see if my answer could > be improved, I just look in the forum where I can see a range of methods of > solution instead of just one. > > That said, I vote to keep the solutions (providing they are written by the > page editor) since IMO they do no harm. I agree with this (I personally contributed some small solutions and tried to at least comment them a minimum), but I noticed a smartass replaced valid solutions by references to the sequences dictionary... As the goal of PE is to solve the question by program (at least in my understanding), I feel this qualify as vandalism... especially as the program replaced whatever their value were in Haskell whereas the sequence dictionary has no relation to Haskell. Otherwise I don't see where the fact that this page exists is in any way harmful or unsporting, I never looked it up before solving a question by myself but have found it valuable to check my solution against. -- Jedaï ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Binary IEEE floating point format for AMQP
On Sun, Feb 24, 2008 at 12:21:00PM +, Paul Johnson wrote:
> I'm working on an implementation of the framing layer for AMQP
> (www.amqp.org). I almost had 0.9 finished when I found they had released
> the spec for 0.10, so I have to redo quite a lot of work.
>
> Amongst the new features of 0.10 are wire formats for floating point.
> These are the 4 and 8 byte IEEE formats.
>
> * Is there a principled way of converting a Haskell Float or Double (or
> Rational, for that matter) to and from IEEE format?
>
> * Since many computers use IEEE format natively, is there a quicker way of
> doing this on those architectures?
{-# LANGUAGE MagicHash #-}
import Data.Int
import GHC.Exts
foo :: Double -> Int64 --ghc only
foo (D# x) = I64# (unsafeCoerce# x)
Stefan
signature.asc
Description: Digital signature
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Re: [Haskell-cafe] haskellwiki and Project Euler
On 24/02/2008, Chaddaï Fouché <[EMAIL PROTECTED]> wrote: > 2008/2/24, Rodrigo Queiro <[EMAIL PROTECTED]>: > > > > That said, I vote to keep the solutions (providing they are written by the > > page editor) since IMO they do no harm. > > > I agree with this (I personally contributed some small solutions and > tried to at least comment them a minimum), but I noticed a smartass > replaced valid solutions by references to the sequences dictionary... > As the goal of PE is to solve the question by program (at least in my > understanding), I feel this qualify as vandalism... especially as the > program replaced whatever their value were in Haskell whereas the > sequence dictionary has no relation to Haskell. > I encourage you to put your solutions back up, that would be good. Referencing OEIS is a bit of a cheesy way to do things. (Though if it's going to be done, one could at least make use of the excellent Math.OEIS library :) - Cale ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Graphical graph reduction
I think HOPS is what you are looking for http://www.cas.mcmaster.ca/~kahl/HOPS/ It may advertize itself otherwise, but the main thing you 'see' when running programs in fully explicit mode is exactly all the graph reductions. Jacques ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
2008/2/24, Cale Gibbard <[EMAIL PROTECTED]>: > I encourage you to put your solutions back up, that would be good. > Referencing OEIS is a bit of a cheesy way to do things. (Though if > it's going to be done, one could at least make use of the excellent > Math.OEIS library :) Indeed !! But I don't think any of my solutions was replaced, I just noticed this. -- Jedaï ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
What really puzzles me is that while Dan referred to the sporting spirit of PE, this really doesn't seem to be a spirit embodied by many of the users. Reading through the forum will reveal the first few posts to be of the form "wrote a crappy brute force solver for the first few terms, searched OEIS, 'solved'". I really don't understand why someone would do that. On 24/02/2008, Chaddaï Fouché <[EMAIL PROTECTED]> wrote: > > 2008/2/24, Rodrigo Queiro <[EMAIL PROTECTED]>: > > > The only time I have found the solutions page useful is when I was > working > > on problem 100, which I'd been thinking about on and off for several > months. > > Eventually, I gave up and looked at the solution there, and was > absolutely > > none the wiser as to how it was solved! I thought about it more over the > > next few months, and eventually just copied and ran that program, put it > > into PE, and looked at the forum, and finally understood how I should > have > > solved the problem. > > > > Without the solutions page, I would probably never have been able to > solve > > the problem, and would know even less about Diophantine Equations than I > > currently do. However, the only value was the actual numerical solution, > > since when I have solved a problem myself and want to see if my answer > could > > be improved, I just look in the forum where I can see a range of methods > of > > solution instead of just one. > > > > That said, I vote to keep the solutions (providing they are written by > the > > page editor) since IMO they do no harm. > > > I agree with this (I personally contributed some small solutions and > tried to at least comment them a minimum), but I noticed a smartass > replaced valid solutions by references to the sequences dictionary... > As the goal of PE is to solve the question by program (at least in my > understanding), I feel this qualify as vandalism... especially as the > program replaced whatever their value were in Haskell whereas the > sequence dictionary has no relation to Haskell. > > Otherwise I don't see where the fact that this page exists is in any > way harmful or unsporting, I never looked it up before solving a > question by myself but have found it valuable to check my solution > against. > > > -- > Jedaï > ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] how to catch keyboard interrupts?
This is pretty cool, but I have one warning: On Sat, Feb 23, 2008 at 4:37 PM, Uwe Hollerbach <[EMAIL PROTECTED]> wrote: > > data MyInterrupt = MyInt Int > > instance Typeable MyInterrupt where > > typeOf x = typeOf (0 :: Int) I am pretty sure that this makes Dynamic unsound; you could accidentally cast from an Int to a MyInterrupt or vice versa. Try this instead: > data MyException = Interrupt deriving Typeable then you can safely use throwDyn and catchDyn on this type. -- ryan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] how to catch keyboard interrupts?
Thanks, I'll try that. -- Uwe On 2/24/08, Ryan Ingram <[EMAIL PROTECTED]> wrote: > This is pretty cool, but I have one warning: > > On Sat, Feb 23, 2008 at 4:37 PM, Uwe Hollerbach <[EMAIL PROTECTED]> wrote: > > > data MyInterrupt = MyInt Int > > > instance Typeable MyInterrupt where > > > typeOf x = typeOf (0 :: Int) > > I am pretty sure that this makes Dynamic unsound; you could > accidentally cast from an Int to a MyInterrupt or vice versa. Try > this instead: > > > data MyException = Interrupt deriving Typeable > > then you can safely use throwDyn and catchDyn on this type. > > >-- ryan > ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Graphical graph reduction
Is there any place that can we download the HOPS program itself? It unfortunately doesn't seem available from that page. On 24/02/2008, Jacques Carette <[EMAIL PROTECTED]> wrote: > I think HOPS is what you are looking for > > http://www.cas.mcmaster.ca/~kahl/HOPS/ > > > It may advertize itself otherwise, but the main thing you 'see' when > running programs in fully explicit mode is exactly all the graph reductions. > > > Jacques > > ___ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskellwiki and Project Euler
Project Euler is excellent, lots of fun, and rewarding. Thanks to Daniel and all the other members of the team. Project Euler problems, by their nature, also happen to be excellent material for teaching and learning Haskell. Having various solutions to them on the wiki is a valuable resource for the Haskell community, in my opinion. Even without the universal quantifiers. I agree that the best way to get the most benefit out of Project Euler itself is by following the rules. So I admit to having added some prominent "spoiler warning" wrappers to the "Euler Problems" wiki pages some time ago. I haven't looked there in a while, I hope they're still there. They help those who want to "do it right" to avoid ruining it for themselves. Here are some use cases for Project Euler solutions posted to our wiki: 1. Haskell newcomers who have already solved the problems in their (former) favorite language. They'll be _amazed_ when they see it in Haskell! 2. People who have already solved a problem in Haskell, and want to see other Haskell solutions concentrated in one place. Often the forum is difficult to use in that way. 3. Someone who is using a certain specific problem for learning to program in Haskell, and has decided to trade the chance for full enjoyment of the problem as a Project Euler problem for the chance for advancement in learning Haskell. I'm not sure I would recommend that, but it is a choice that people are free to make, and appropriate for our wiki if they should so decide. I am opposed to allowing non-Haskell solutions on our wiki, except when they are clearly needed for comparison in order to make a point about Haskell. General discussions about Project Euler solutions should go elsewhere, like anything else off-topic. As for those who want to intentionally cheat - they are only hurting themselves. As others have pointed out, there are plenty of other places out there to do it. If those people think they will earn themselves any respect that way, I think they are naive. I don't feel that we should allow them to prevent _us_ from benefiting just because they decided to do that to themselves. So the bottom line is, in my opinion: o Of course, material that infringes on copyrights or licenses must go. o Non-infringing solutions in Haskell, when wrapped in appropriate spoiler warnings, further the cause of Haskell without causing any significant damage to Project Euler. They should therefore remain. o Solutions having nothing to do with Haskell are off-topic and should not be on our wiki. I hope this position admits the possibility of a continued amicable relationship with the Project Euler team. Regards, Yitz ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Graphical graph reduction
Thank you all for showing interest and responding. > Check out http://thyer.name/lambda-animator/. Requires Java. Wow, this is SUCH a cool tool. Best discovery in a long time! I think I need to brush up on my lambda-calculus, because it took me some time to figure out what settings to use to get something similar to Haskell. Function strategy "substitute by name", Argument strategy "call by need" and Reduce to "weak head normal form" seem to work OK, though. One issue, though. When trying out my infinite-list-of-fibs example, I have an auxiliary function (define nth (lambda (n xs) (if (= n 0)(head xs)(nth (- n 1) (tail xs) and this is not behaving the way I want, i.e. like the Haskell function nth n (x:xs) = if n == 0 then x else nth (n-1) xs because it doesn't do pattern matching, i.e. it doesn't force the argument to be evaluated until it fits the x:xs pattern. I can't figure out to simulate this eager pattern in the lisp that the lambda-animator uses. This means that if I e.g. do a (nth 8 fibs) in the animator, I get a long string of tail's before it actually starts expanding the fibs list... Anyway, on the side, I also started working on this myself in SML New Jersey. (Sorry, this will probably make me unpopular here on Haskell-cafe, but the ability to use references was just too tempting, and I'm not too experienced with purely functional data structures). My approach isn't as general, though, I don't have lambda's and apply's in my syntax tree. I just have functions there as nodes, and then the application of them has to be implemented as reduction rules. This approach does make the graph a bit less messy to look at, though. Also, since I implement the reduction rules myself, the pattern matching problem described above isn't a problem. > I think HOPS is what you are looking for > http://www.cas.mcmaster.ca/~kahl/HOPS/ Yes, HOPS looks very promising. However, I cannot find the download link either. And Kahl hasn't replied to my email yet. Again, thank you all for replying. Kai ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] parsing c
I'd like to parse some C headers for a toy project. It seems like c2hs probably has the functionality I want, but it's not packaged up as a library. So two questions: Is there an alternative C-parsing library? Has anyone looked into librarifying c2hs's parser? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] A little toy of Haskell Trivia
Ross, I changed the query to "count(distinct package)" and indeed the "noises" of same package imports are filtered out. The two top-10 lists now look somewhat similar. GHC only: http://haskell.ecoin.net/cgi-bin/modules.pl?src=ghc 1 Control.Monad 22 2 Data.Char 20 3 System.IO 17 4 Data.List 16 5 Data.Maybe 16 6 System.IO.Unsafe 14 7 Control.Exception 13 8 Foreign.Ptr 11 9 Data.Word 11 10 Foreign.C 11 GHC+HackageDB: http://haskell.ecoin.net/cgi-bin/modules.pl?src=both 1 Control.Monad 178 2 Data.List 132 3 Data.Maybe 113 4 Data.Char 104 5 System.IO 99 6 Control.Exception 98 7 Data.Word 83 8 System.IO.Unsafe 81 9 Foreign 74 10 Data.Map 68 Steve On Sat, Feb 23, 2008 at 5:25 PM, Ross Paterson <[EMAIL PROTECTED]> wrote: > On Sat, Feb 23, 2008 at 10:59:40AM -0500, Steve Lihn wrote: > > I parsed through all the hackagedb > > modules. I also added the display of repository source (ghc, hdb) and > > package source. HackageDB is 3-4 times bigger than GHC core. The > > result is interesting, looking at the most used modules move up and > > down the rank... > > > > http://haskell.ecoin.net/cgi-bin/modules.pl > > You'd get a different picture again if you excluded same-package imports. > Some of the high-ranking modules are used internally in large packages. > ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] parsing c
On Sun, Feb 24, 2008 at 4:08 PM, Evan Martin <[EMAIL PROTECTED]> wrote: > So two questions: Is there an alternative C-parsing library? You could use gcc-xml[1] with one of the various XML parsers. [1] http://www.gccxml.org/HTML/Index.html -- Adam Langley [EMAIL PROTECTED] http://www.imperialviolet.org ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] parsing c
Evan Martin wrote: > So two questions: Is there an alternative C-parsing library? Has > anyone looked into librarifying c2hs's parser? I have split c2hs into three packages once, the remains of CTK that it uses, the C parser and pretty printer, and c2hs itself. (I also tried to give the modules more sensible hierarchical names - CTK would reside in CTK.* and the C stuff in Language.C.*) However, I found the result fairly hard to use, partly due to CTK and partly because some aspects of the C ADT that c2hs uses appears to be designed for c2hs, not as a general purpose C AST. There's also a lot of room for adding new utility functions for inspecting the AST. I'm reluctant to publish the split packages because they really don't add much value over c2hs and I don't want to create a c2hs fork, or duplicate effort that goes into improving that code. Bertram ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: static constants -- ideas?
jay:
> Don Stewart [EMAIL PROTECTED]:
> >jay:
> >> I also have constants that are too large to compile. I am resigned to
> >> loading them from data files--other solutions seem even worse.
> ...
> >> Data.Binary eases the irritation somewhat.
> >
> >Did you try bytestring literals (and maybe parsing them in-memory with
> >Data.Binary)?
>
> That didn't occur to me, since neither of my large constants includes
> strings I think you're suggesting that each constant could appear in
> the source as a long bytestring and be deserialized into the data
> structure. If that works, it should improve the startup time, but it's
> still not as nice as simply compiling it straight up.
>
> I'll try it.
Here's an example, which stores a Data.Map in a gzip-compressed bytestring
literal (a C
string literal in the compiled code). The Map is reconstructed on
startup.
{-# LANGUAGE OverloadedStrings #-}
import Data.Binary
import qualified Data.Map as M
import qualified Data.ByteString.Char8 as S
import Data.ByteString.Lazy
import Codec.Compression.GZip
--
-- this is a gzip compressed literal bytestring, storing a binary-encoded
Data.Map
--
mytable =
"\US\139\b\NUL\NUL\NUL\NUL\NUL\NUL\ETXEN\219\SO\194
\f\197\224\188\196\CAN\227\US\224\171~\NAKc\GS4ce\161`\178\191\215(\176\190\180\167\231\210\n\241\171\203\191\ti\157\217\149\249<
\ENQ\214\&9>\202\162\179a\132X\233\ESC=\231\215\164\SYN\157\DC2D\226*\146\174o\t\167\DLE\209\"i_\240\193\129\199http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] placeholders in hsql
Is there an ability to use placeholders in SQL statement using hsql? (Actually I'm interested in SQLite.) E.g. "INSERT INTO sales (product_code, qty, price) VALUES (?, ?, ?)" and then supply values that will be escaped and inserted in place of each '?'. -- Roman I. Cheplyaka :: http://ro-che.info/ ...being in love is totally punk rock... signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
