Re: [Haskell-cafe] SIGPLAN Programming Languages Software Award
I think the history of generics in Java is Pizza (http://pizzacompiler.sourceforge.net/) - GJ (http://lamp.epfl.ch/pizza/gj/) - Java I think that if you consider that history, and in particular the Pizza compiler, then the connection to FP becomes rather obvious. Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] cap 3: stopping thread 3 (stackoverflow)
I don't think a stack overflow event indicates an RTS bug. Stack overflow events usually result in the RTS trying to adjust the stack size, and only if that fails, the program is halted. (... and why can't I copy/paste the text from threadscope's output window) As a workaround, you can use the show-ghc-events binary that is provided by the ghc-events package. Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Cabal: top level dependency base -any
Hi. Could anyone shed light on the meaning of this error message? cabal: cannot configure xmonad-0.9.1 It requires base ==3.* For the dependency on base ==3.* there are these packages: base-3.0.3.1 and base-3.0.3.2. However none of them are available. base-3.0.3.1 was excluded because of the top level dependency base -any base-3.0.3.2 was excluded because of the top level dependency base -any It's not a great error message. Yes, xmonad-0.9.1 requires base ==3.*. So far, so good. Now, base is a special package. It comes with ghc, and cannot be upgraded. That's why Cabal will rule out all base versions but the one you already have installed. If you have a recent ghc, that'll be base-4. So Cabal is correct to fail in this case: you cannot install this version of xmonad with this version of ghc. But yes, the error message could (and hopefully soon will) be improved. Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Cabal: top level dependency base -any
Hi. So would it be correct to infer that the -any restriction will only (and always) come into play with special packages such as base? No. Unfortunately, -any really means any version is allowed, so that's why the error message is really misleading. Are there any other special packages besides base? W.r.t. Cabal's dependency resolution? No. Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Data constructor synonyms
Remember that constructors are functions, except that you can't pattern match against them. .. The downside is that you can't pattern-match against these functions. The thing is that I need pattern matching, just functions won't do. It's only a preprocessor, but Conor's she allows pattern synonyms: http://personal.cis.strath.ac.uk/~conor/pub/she Anyway, a new question arose. If I have already declared a type, can I add new constructors to it from other modules? Again, not within Haskell itself. she also has a feature that allows something like this. There are various other techniques or proposals. For example: http://www.cs.ru.nl/~wouters/Publications/DataTypesALaCarte.pdf http://people.cs.uu.nl/andres/OpenDatatypes.html Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] lhs2tex and line numbers
Hi. How could I convince lhs2tex to add in poly mode line numbers before each code line in code block? A long time ago, I've written some experimental code that achieves line numbering in lhs2tex. I've committed the files to the github repository, so you can have a look at the .fmt file and the demo document in https://github.com/kosmikus/lhs2tex/tree/master/ExtLibrary/lineno HTH, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] lhs2tex build failure
The latest version on GitHub should fix the problem. I'll make a new release soon. https://github.com/kosmikus/lhs2tex Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Re: Hackage accounts and real names
Let me summarise the main arguments against the restriction: 1. It stops people from contributing [..] 2. Inconsistency [..] 3. Privacy issues [..] 4. It inteferes with people's freedom - who has the right to dictate what name a person (or, for that matter, a group of people) should be known as? 5. It encourages dishonesty: if you want to contribute but not reveal your real name, you have the option to lie about it, and can be fairly confident your lie will never be called. +1 for allowing nicks. Another +1 from me. I must admit that I had never really thought about this restriction, but the arguments against the restriction clearly convince me. I have heard no valid arguments in favour of the restriction. I can see that there are advantages to requiring real names, but that only makes sense if it is enforced (and I certainly don't advocate that). The way it is now, where some people who just silently use pseudonyms get accounts, and others, who are not willing to lie, are rejected, is very bad. If people are really worried about trust, then a comment/reviewing system for Hackage is a better solution. Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell course, training
Hi Günther, all going well this year I'll be able to invest some money on becoming a better Haskeller. I think I've reached the point where I need some tutoring, so provided I've got money for travel and course fees, and time, where do I get it? I'm not a student so some courses aren't available to me. please consider the summer school in Applied Functional Programming that we at Utrecht University are going to offer this year for the second time: http://www.utrechtsummerschool.nl/index.php?type=coursescode=H9 While the school is mainly aimed at students (bachelor- and master-level), we have no formal requirement that participants must be students, and we will certainly consider other applications. Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: lhs2TeX \eval{} problem
Hi.
I'm having a problem with lhs2Tex and \eval{}. It doesn't work.
I have the following in a file test.lhs:
%include polycode.fmt
One
%option ghci
Two
\eval{4}
Three
When I try to run this file through lhs2Tex, it crashes:
lhs2Tex test.lhs
... polycode junk removed ...
One
%option ghci
Two
lhs2TeX: fd:7: hGetLine: end of file
Has someone encountered this problem before, or knows how to solve this?
Two issues:
First, it's
%options ghci
and not
%option ghci
Second, the \eval is executed in the context of the current file,
i.e., the source must be a valid literate Haskell file. An empty
literate file causes the literate preprocessor to fail. This
works for me:
%include polycode.fmt
One
%options ghci
Two
\eval{4}
Three
x = 0
HTH,
Andres
--
Andres Loeh, Universiteit Utrecht
mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de
http://www.andres-loeh.de
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Re: [Haskell-cafe] Re: lhs2TeX \eval{} problem
Oh, well that teaches me not to type myself... Copy-and-paste is way better! Now lhs2TeX no longer crashes, unfortunately it still doesn't work correctly. It now simply hangs after printing the line Two. It doesn't crash, or eat memory or cpu. It just sits there, doing nothing, until I kill the process. Are you sure you added the extra line at the end? Try to call ghci on the source file. If it manages to load it without errors, then lhs2TeX should succeed as well. Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANN: lhs2tex-1.15 (was: lhs2tex, Haskell Platform and cygwin)
Also, it would be nice if there were an lhs2tex version which worked out-of-the-box with base=4, since hacking the Makefile for that seems, er, sub-optimal? I've just uploaded 1.15 which should work better on Windows. Sorry, I should have released a new version a long time ago. Please let me know if this works. Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] lhs2tex + pretty print
The attached document works for me.
HTH,
Andres
--
Andres Loeh, Universiteit Utrecht
mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de
http://www.andres-loeh.de
\documentclass{article}
%include polycode.fmt
%options ghci
\begin{document}
\section{Test}
test = putStrLn \\section{Result}\n\nIt works!
\perform{test}
\end{document}
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Re: [Haskell-cafe] Functors and the Visitor Pattern
Although, now I'm second guessing myself, because I can't figure out how we could create some design pattern that simulates an applicative functor. I'm pretty sure the Visitor pattern doesn't take you this far (but I am willing to be corrected). So, is there a way to create applicative functors in non-functional languages? What would that pattern look like? Perhaps this paper can answer your question: Jeremy Gibbons, Bruno C.d.S. Oliveira The essence of the Iterator pattern http://web.comlab.ox.ac.uk/oucl/work/jeremy.gibbons/publications/iterator.pdf HTH, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] The votes are in!
The results of the Haskell logo competition are in! You can view them at http://www.cs.cornell.edu/w8/~andru/cgi-perl/civs/results.pl?num_winners=1id=E_d21b0256a4fd5ed7algorithm=beatpath Congratulations Jeff Wheeler! Is there also a measure of how strong the winner wins over the losers? Scroll to the bottom of the results page linked above and click on the button, and you'll get a matrix comparing each logo to each other logo. You still have to interpret the results yourself, though. Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Hac5 projects page
on http://www.haskell.org/haskellwiki/Hac5/Projects, you can list a project under “Project descriptions” and under “Experiences”. What’s the difference? Project descriptions are supposed to be projects you're currently working on or want to work on during the Hackathon. Experiences are not necessarily projects (and feel free to update the description on the page to reflect that), but general Haskell-related things you are familiar with. So, if for example I am looking for someone with a lot of experience in writing library bindings using the FFI, I could look in that list if anyone attending might be able to help me ... HTH, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Type wildcards
Type wildcards that allow partially specifying types, e.g: f :: _ - String f x = show x This will instruct the type-inferrer to fill out the wild-card part only (e.g: Show a = a). Also see http://hackage.haskell.org/trac/haskell-prime/wiki/PartialTypeAnnotations Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:and...@cs.uu.nl mailto:m...@andres-loeh.de http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Associated data types
Hi. Date: Wed, 10 Dec 2008 13:36:11 + From: Lennart Augustsson [EMAIL PROTECTED] Subject: Re: [Haskell-cafe] Associated data types For an associated data type D, we know that the type function D is injective, i.e., for different indicies given to D we'll get different data types. This makes much more powerful reasoning possible in the type checker. If associated data types are removed there has to be some new mechanism to declare an associated type as injective, or the type system will lose power. -- Lennart 2008/12/10 Eyal Lotem [EMAIL PROTECTED]: If we have associated type synonyms, is there still reason to have associated data types? [...] Another, somewhat related, issue is that associated type synonyms cannot currently be partially applied, whereas associated data types can. Cheers, Andres -- Andres Loeh, Universiteit Utrecht mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.andres-loeh.de ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Function Composition
Can anyone explain why Shape.Polygon would have a different type to (Shape).Polygon, I thought the brackets would be redundant. Here is the output from a Hugs session Animation :v -- Hugs Version 20050113 Animation :t Shape Shape :: Shape - Region Animation :t Polygon Polygon :: [Vertex] - Shape Animation :t (Shape.Polygon) Polygon :: [Vertex] - Shape Animation :t ((Shape).Polygon) Shape . Polygon :: [Vertex] - Region Animation :t Shape.(Polygon) Shape . Polygon :: [Vertex] - Region Shape.Polygon is a qualified name, and you probably have a module called Shape. Use spaces around the dot ... Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Decidable type systems? (WAS: Associated Type Synonyms question)
Can someone explain to me why decidability is of any practical interest at all? What's the (practical) difference between a decision procedure which might never terminate and one which might take 1,000,000 years to terminate? Actually, why push it out to 1,000,000 years: in the context of a compiler for a practical programming language, a decision procedure which might take an hour to terminate might as well be undecidable ... surely all we really need is that the decision procedure _typically_ terminates quickly, and that where it doesn't we have the means of giving it hints which ensure that it will. I'm tempted to agree with you. I don't care if the compiler terminates on all my programs, or if it sometimes quits and says: I don't know if this is correct. However, I do think that it is of very much importance that programmers and compiler implementors know which programs are legal and which are not. If a problem is decidable, it has the nice property that the problem (*not* the algorithm) can be used as a specification. Implementors are free to implement different algorithms, as long as they all solve the problem. If the problem is undecidable, how do you make sure that different compilers accept the same programs? If you don't want to find a subproblem that is decidable, you'll have to specify an algorithm, which is usually far more complicated, error-prone, and difficult to grasp for programmers. Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] REMINDER: Contributions to the HCA Report (November 2005 edition)
Dear Haskellers, the deadline for the November 2006 edition of the Haskell Communities and Activities Report is only a few days away -- but this is still enough time to make sure that the report contains a section on *your* project, on the interesting stuff that you've been doing; using or affecting Haskell in some way. Many projects that have been included in former reports have not yet updated their entries. Please have a look at http://haskell.org/communities/topics.html and at the May 2005 edition for reference. * Has your project been listed in previous Reports, but is not yet updated? Please write a short update! * Are you no longer working on a project that was included in the Report? Write up what you are working on instead, and tell me if someone else has picked up the project. * Is some project you have heard about not included in any previous Report? Please let me know ... There is still time to write a completely new entry, on a new compiler, tool, library, company, user group, idea, ... -- as long as there is a connection to the Haskell language, there is a place for it in the Report! Submissions are due by next Tuesday, that is Tuesday, 01 November 2005. Please mail your entries to hcar at haskell dot org, in plain text or pseudo-(La)TeX format. More information can be found in the original Call for Contributions at http://www.haskell.org/pipermail/haskell/2005-October/016575.html I look forward to receiving your contributions. Thanks a lot, Andres (current editor) -- Haskell Communities and Activities Report (http://haskell.org/communities) 11/2005 edition submission deadline: 01 November 2005 [EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANNOUNCE: Haskell Communities Activities Report (8th ed., May 2005)
On behalf of the many, many contributors, I am pleased to announce that the Haskell Communities and Activities Report (8th edition, May 2005) http://www.haskell.org/communities/ is now available from the Haskell Communities home page in several formats: PDF, for screenreading as well as printing, HTML, for those of you who prefer not to deal with plugins or external viewers, and PostScript, for those of you who have nice quick printers that do not grok PDF. Many thanks go to all the people that contributed to this report, both directly, by sending in descriptions, and indirectly, by doing all the interesting things that are reported. I hope you will find it as interesting a read as we did. If you haven't encountered the Haskell Communities and Activities Reports before, you may like to know that the first of these reports was published in November 2001. Their goal is to improve the communication between the increasingly diverse groups, projects and individuals working on, with, or inspired by Haskell. The idea behind these reports is simple: Every six months, a call goes out to all of you enjoying Haskell to contribute brief summaries of your own area of work. Many of you respond (eagerly, unprompted, and well in time for the actual deadline ;) ) to the call. The editor collects all the contributions into a single report and feeds that back to the community. When we try for the next update, six months from now, you might want to report on your own work, project, research area or group as well. So, please put the following into your diaries now: End of October 2005: target deadline for contributions to the November 2005 edition of the HCA Report Unfortunately, many Haskellers working on interesting projects are so busy with their work that they seem to have lost the time to follow the Haskell related mailing lists and newsgroups, and have trouble even finding time to report on their work. If you are a member, user or friend of a project so burdened, please find someone willing to make time to report and ask them to `register' with the editor for a simple e-mail reminder in the middle of October (you could point us to them as well, and we can then politely ask if they want to contribute, but it might work better if you do the initial asking). Of course, they will still have to find the ten to fifteen minutes to draw up their report, but maybe we can increase our coverage of all that is going on in the community. Feel free to circulate this announcement further in order to reach people who might otherwise not see it. Enjoy! Andres Loeh hcar at haskell.org andres at cs.uu.nl -- Haskell Communities and Activities Report (http://haskell.org/communities) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] lhs2TeX and line numbers in error messages produced by LaTeX
I use lhs2TeX for typesetting literate haskell code. The problem is that LaTeX uses the line numbers from the .tex file generated by lhs2TeX and not the line number from the original .lhs file when producing error messages. Does anyone have a solution for this problem? Sorry, I don't. I think it's very much work to change lhs2TeX so that the generated .tex file will have the same line numbers than the original (%include would have to be mapped to \input statements and each code block would have to produce exactly as many lines as the input was etc.), and AFAIK LaTeX does not have any such thing as LINE pragmas. I usually look at the generated file to find what LaTeX complains about and map this to the original location mentally. I could make lhs2TeX generate line hints as LaTeX comments, to facilitate this process, but this would still require to read the generated file, because the hints wouldn't be interpreted by LaTeX automatically. Cheers, Andres ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] REMINDER: Contributions to the HCA Report (May 2005 edition)
Dear Haskellers, the deadline for the May 2005 edition of the Haskell Communities and Activities Report is only a few days away -- but this is still enough time to make sure that the report contains a section on *your* project, on the interesting stuff that you've been doing; using or affecting Haskell in some way. Many projects that have been included in former reports have not yet updated their entries. Please have a look at http://haskell.org/communities/topics.html and at the November 2004 edition for reference. * Has your project been listed in previous Reports, but is not yet updated? Please write a short update! * Are you no longer working on a project that was included in the Report? Write up what you are working on instead, and tell me if someone else has picked up the project. * Is some project you have heard about not included in any previous Report? Please let me know ... There is still time to write a completely new entry, on a new compiler, tool, library, company, user group, idea, ... -- as long as there is a connection to the Haskell language, there is a place for it in the Report! Submissions are due by next Tuesday, that is Tuesday, 03 May 2005. Please mail your entries to hcar at haskell dot org, in plain text or pseudo-(La)TeX format. More information can be found in the original Call for Contributions at http://www.haskell.org/pipermail/haskell/2005-April/015688.html I look forward to receiving your contributions. Thanks a lot, Andres (current editor) -- Haskell Communities and Activities Report (http://haskell.org/communities) 05/2005 edition submission deadline: 03 May 2005 [EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Call for Contributions -- HCA Report (May 2005 edition)
Dear Haskellers, it is nearly time for the eighth edition of the Haskell Communities Activities Report http://www.haskell.org/communities/ Submission deadline: 03 May 2005 (please send your contributions to hcar at haskell.org, in plain ASCII or LaTeX format) This is the short story: * If you are working on any project that is in some way related to Haskell, write a short entry and submit it to the me. * If you are interested any project related to Haskell that has not previously been mentioned in the HCA Report, tell me, so that I can contact the project leaders and ask them to submit an entry. * Feel free to pass on this call for contributions to others that might be interested. More detailed information: The Haskell Communities Activities Report is a bi-annual overview of the state of Haskell as well as Haskell-related projects over the last, and possibly the upcoming 6 months. If you have only recently been exposed to Haskell, it might be a good idea to browse the November 2004 edition -- you will find interesting topics described as well as several starting points and links that may provide answers to many questions. Contributions will be collected until the beginning of May. They will be compiled into a coherent report which will appear sometime during May. As always, this is a great opportunity to update your webpages, make new releases, announce of even start new projects, or to point at some developments you want every Haskeller to see! As the purpose of the report is to collect recent or current activities, we encourage you to update all existing summaries and reports. We will probably drop any topics that have not had any activity for the past year, i.e., since May 2004, but we would very much prefer you to present an updated description of the topic. Of course, new entries are more than welcome. Reports should generally be kept brief and informative, ranging from a few sentences to a few hundred words, to keep the whole report reasonably sized. Looking forward to your contributions, Andres (current editor) --- topics New suggestions for current hot topics, activities, projects, etc. are welcome - especially with names and addresses of potential contacts, but here is a non-exclusive list of likely topics (see also http://www.haskell.org/communities/topics.html ): General Haskell developments; Haskell implementations; Haskell extensions; Standardization and documentation; Haskell tutorials, howtos and wikis; Organisation of Haskell tool and library development; Haskell-related projects and publications; new research, fancy tools, long-awaited libraries, cool applications; Feedback from specialist mailing lists to the Haskell community as a whole; Haskell announcements; all (recent) things Haskell Announcements: if you've announced anything new on the Haskell list over the last six months, you'll want to make sure that is reflected in this edition! Project pings: if you're maintaining a Haskell tool or library or somesuch, you'll want to let everyone know that it is still alive and actively maintained, even if there have been no new additions, but all the more if there have been new developments. Tutorials: if you've fought with some previously undocumented corner of Haskell, and have been kind enough to write down how you did manage to build that graphical user interface, or if you've written a tutorial about some useful programming techniques, this is your opportunity to spread the word (short, topic-specific, and hands-on tutorials that only show how to achieve a certain practical task would do a lot to make things easier for new Haskellers - please write some!) Applications: if you've been working quietly, using Haskell for some interesting project or application (commercial or otherwise), you might want to let others know about what you're using Haskell for, and about your experiences using the existing tools and libraries; are you using Haskell on your job? An interesting thread about using Haskell and more generally functional programming for non-Haskell things seems to recur with reasonable frequency - why not write a sentence or two about your use of Haskell for our report? Feedback: if you're on one of the many specialist Haskell mailing lists, you'll want to report on whatever progress has been made there (GUI API discussions, library organisation, etc.) If you're unsure whether a contact for your area of work has come forward yet, have a look at the report's potential topics page, or get in touch with me. I have contacted last time's contributors, hoping they will volunteer to provide updates of their
Re: [Haskell-cafe] The difference between ($) and application
Date: Tue, 14 Dec 2004 10:24:15 -0500 From: Andrew Pimlott [EMAIL PROTECTED] Subject: Re: [Haskell-cafe] The difference between ($) and application On Tue, Dec 14, 2004 at 11:23:24AM +0100, Henning Thielemann wrote: On Tue, 14 Dec 2004, Andrew Pimlott wrote: (Of course, it's still useful, by itself or in a slice, as a higher-order operator.) You can also use 'id' in this cases, right? I'm thinking of things like zipWith ($) map ($ x) You can indeed use zipWith id map (`id` x) instead. Look at the types: id :: a - a ($) :: (a - b) - (a - b) The function ($) is the identity function, restricted to functions. Nevertheless, I find using ($) in such a situation more descriptive than using id. Cheers, Andres ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANNOUNCE: Haskell Communities Activities Report (7th ed., November 2004)
Right in time, I am pleased to announce -- on behalf of the many contributers -- that the Haskell Communities and Activities Report (7th edition, November 2004) http://www.haskell.org/communities/ is now available from the Haskell Communities home page in several formats: PDF, for screenreading as well as printing, HTML, for those of you who prefer not to deal with plugins or external viewers, and PostScript, for those of you who have nice quick printers that do not grok PDF. Many thanks go to all the people that contributed to this report, both directly, by sending in descriptions, and indirectly, by doing all the interesting things that are reported. I hope you will find it as interesting a read as we did. If you haven't encountered the Haskell Communities and Activities Reports before, you may like to know that the first of these reports was published in November 2001. Their goal is to improve the communication between the increasingly diverse groups, projects and individuals working on, with, or inspired by Haskell. The idea behind these reports is simple: Every six months, a call goes out to all of you enjoying Haskell to contribute brief summaries of your own area of work. Many of you respond (eagerly, unprompted, and well in time for the actual deadline ;) ) to the call. The editor collects all the contributions into a single report and feeds that back to the community. When we try for the next update, six months from now, you might want to report on your own work, project, research area or group as well. So, please put the following into your diaries now: End of April 2005: target deadline for contributions to the May 2005 edition of the HCA Report Unfortunately, many Haskellers working on interesting projects are so busy with their work that they seem to have lost the time to follow the Haskell related mailing lists and newsgroups, and have trouble even finding time to report on their work. If you are a member, user or friend of a project so burdened, please find someone willing to make time to report and ask them to `register' with the editor for a simple e-mail reminder in the middle of April (you could point us to them as well, and we can then politely ask if they want to contribute, but it might work better if you do the initial asking). Of course, they will still have to find the ten to fifteen minutes to draw up their report, but maybe we can increase our coverage of all that is going on in the community. Feel free to circulate this announcement further in order to reach people who might otherwise not see it. Enjoy! Andres Loeh [EMAIL PROTECTED] [EMAIL PROTECTED] -- Haskell Communities and Activities Report (http://haskell.org/communities) ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] REMINDER: Contributions to the HCA Report (November 2004 edition)
Dear Haskellers, the deadline for the November 2004 edition of the Haskell Communities and Activities is approaching quickly -- but there are still a few days left to make sure that the report contains a section on *your* project, on the interesting stuff that you've been doing, using or affecting Haskell in some way. In particular, any information regarding upcoming, Haskell-related, events is highly appreciated (conferences, workshops, summer schools ...). Many FP research groups have not yet updated their reports. Furthermore, please have a look at http://haskell.org/topics.html * Is your project listed, but not yet updated? Please write a short update! * Is a project listed that you are no longer working on? Write up what you are working on instead, and tell me if someone else has picked up the project. * Is something you have heard about not in the list? Please let me know ... There is still time to write a completely new entry, on a new compiler, tool, library, company, user group, idea, ... -- as long as there is a connection to the Haskell language, there is a place for it in the report! Submissions are due by the end of this week, that is Friday, 29 October 2004. Please mail your entries to hcar at haskell dot org, in plain text or pseudo-(La)TeX format. I look forward to receiving your contributions. Thanks a lot, Andres (current editor) -- Haskell Communities and Activities Report (http://haskell.org/communities) 11/2004 edition submission deadline: 29 October 2004 [EMAIL PROTECTED] ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: REMINDER: Contributions to the HCA Report (November 2004 edition)
Sorry, the link was incorrect. The pointer should have been: Furthermore, please have a look at http://haskell.org/communities/topics.html Cheers, Andres -- Haskell Communities and Activities Report (http://haskell.org/communities) 11/2004 edition submission deadline: 29 October 2004 [EMAIL PROTECTED] ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
