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  • Is Haskell's type system an obstacle to understanding functional programming?

    - by FarmBoy
    I'm studying Haskell for the purpose of understanding functional programming, with the expectation that I'll apply the insight that I gain in other languages (Groovy, Python, JavaScript mainly.) I choose Haskell because I had the impression that it is very purely functional, and wouldn't allow for any reliance on state. I did not choose to learn Haskell because I was interested in navigating an extremely rigid type system. My question is this: Is a strong type system a necessary by-product of an extremely pure functional language, or is this an unrelated design choice particular to Haskell? If it is the latter, I'm curious what would be the most purely functional language that is dynamically typed. I'm not particularly opposed to strong typing, it has its place, but I'm having a hard time seeing how it benefits me in this educational endeavor.

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  • Best way to prevent Google from indexing a directory [duplicate]

    - by Gkhan14
    This question already has an answer here: Stopping Google index some web pages I have 5 answers I've researched many methods on how to prevent Google/other search engines from crawling a specific directory. The two most popular ones I've seen are: Adding it into the robots.txt file: Disallow: /directory/ Adding a meta tag: <meta name="robots" content="noindex, nofollow"> Which method would work the best? I want this directory to remain "invisible" from search engines so it does not affect any of my site's ranking. In other words, I want this directory to be neutral/invisible and "just there." I don't want it to affect any ranking. Which method would be the best to achieve this?

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  • Installing e text editor

    - by kristian nissen
    I am trying to get e-text editor to run. I read http://www.e-texteditor.com/forum/viewtopic.php?p=14953#14953 and Compile e-text editor on Linux as well. But on my 10.04 Lucid it fails at the following step: ./build_externals_linux.sh debug with the following error messages: Building debug binaries Building 32-bit binaries Going to place output in /opt/etexteditor/external/out.debug ./build_externals_linux.sh: line 41: pushd: bakefile: No such file or directory ./build_externals_linux.sh: line 42: ./configure: No such file or directory Cannot compile bakefile ./build_externals_linux.sh: line 46: popd: directory stack empty ./build_externals_linux.sh: line 49: pushd: metakit: No such file or directory ./build_externals_linux.sh: line 50: cd: builds: No such file or directory Cannot compile MetaKit ./build_externals_linux.sh: line 56: popd: directory stack empty ./build_externals_linux.sh: line 59: pushd: pcre: No such file or directory ./build_externals_linux.sh: line 60: ./configure: No such file or directory Cannot compile pcre ./build_externals_linux.sh: line 66: popd: directory stack empty ./build_externals_linux.sh: line 69: pushd: tinyxml: No such file or directory make: *** No rule to make target `clean'. Stop. cannot compile TinyXML ./build_externals_linux.sh: line 77: popd: directory stack empty ./build_externals_linux.sh: line 80: pushd: libtommath: No such file or directory make: *** No rule to make target `clean'. Stop. Cannot compile LTM ./build_externals_linux.sh: line 85: popd: directory stack empty ./build_externals_linux.sh: line 88: pushd: libtomcrypt: No such file or directory make: *** No rule to make target `clean'. Stop. Cannot compile LTC ./build_externals_linux.sh: line 93: popd: directory stack empty ./build_externals_linux.sh: line 96: pushd: wxwidgets: No such file or directory ./build_externals_linux.sh: line 97: ./configure: No such file or directory Cannot compile wxWidgets ./build_externals_linux.sh: line 104: popd: directory stack empty ./build_externals_linux.sh: line 107: pushd: webkit: No such file or directory make: *** No rule to make target `clean'. Stop. ./build_externals_linux.sh: line 109: ./WebKitTools/Scripts/build-webkit: No such file or directory Cannot compile WebKit ./build_externals_linux.sh: line 113: popd: directory stack empty what am I missing?

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  • Maven 2.1.0 not passing on system properties to Java virtual machine

    - by raisercostin
    We use the command line to pass on system properties to the Java virtual machine when running our Hudson builds on a Linux box. It used to work quite well in 2.0.9 by since we upgraded to 2.1.0 it has stopped working altogether. The system properties just never make it to the Java virtual machine. I have created a small test project and indeed it does not work at all. I have attached it in case you want to give it a go. This should work just fine with Maven 2.0.9: mvn2.0.9 -Dsystem.test.property=test test But this will fail: mvn2.1 -Dsystem.test.property=test test The Java code simply does this assertTrue( System.getProperty("system.test.property") != null); , Apr 20, 2009; 12:44pm edward eric pedersson

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  • Is Haskell's type system an obstacle to understanding functional programming?

    - by Eric Wilson
    I'm studying Haskell for the purpose of understanding functional programming, with the expectation that I'll apply the insight that I gain in other languages (Groovy, Python, JavaScript mainly.) I choose Haskell because I had the impression that it is very purely functional, and wouldn't allow for any reliance on state. I did not choose to learn Haskell because I was interested in navigating an extremely rigid type system. My question is this: Is a strong type system a necessary by-product of an extremely pure functional language, or is this an unrelated design choice particular to Haskell? If it is the latter, I'm curious what would be the most purely functional language that is dynamically typed. I'm not particularly opposed to strong typing, it has its place, but I'm having a hard time seeing how it benefits me in this educational endeavor.

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  • System Slow After Uprading Ubuntu

    - by Aragon N
    i have an ubuntu network machine which has release of 10.04.1 LTS Lucid. on this system i have apache, postgresql and django. for some app. development i have to install php and php-curl... due to being on network, i have exported wmvare machine to internet and firstly i have upgraded system and then install php5 packages on it. After all replacing it with its old place, i have considered that the new system query is some slow according to another. Old system query time : 140 ms New system query time : 9.11 s i have checked /etc/network interface and it seems there is no problem. i have checked /etc/resolv.conf and it seems ok i have checked /etc/nsswitch.conf and only host section is different from old one which old system has hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 and then i have checked time host -t A services.myapp.com and i got real 0m0.355s user 0m0.010s sys 0m0.020s and now what can i have to check for boosting my system as before?

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  • How do I make the directories in a zip file relative to the target directory instead of my working directory

    - by Nathan
    I'm calling the zip command from a script where I cannot change directory. I need to make a zip file of the stuff in data/kit123/ from the directory which data resides in, but I want the contents of the zip to only be the contents of kit123, with paths relative to kit123. This is the directory structure myworkingdir data kit123 kitpart1 file.xcf anotherfile.xcf kitpart2 ... kit124 ... My script runs in myworkingdir and cannot change directories. If I call zip -r kit123.zip data/kit123 then the structure in the zip file will be data kit123 kitpart1 file.xcf anotherfile.xcf kitpart2 but I want it to be kit123 kitpart1 file.xcf anotherfile.xcf kitpart2 Is there a zip option I can use to accomplish this? It seems odd that it should depend on my working directory I know it's not -j. that one destroys the structure within kit123

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  • What are the system requirements for each flavor of Ubuntu Desktop?

    - by Braiam
    I'm thinking about installing Ubuntu Desktop, but I don't know what flavor is the better for my system. What are the minimum and recommended hardware requirements? What kind of CPU? How much memory? Should I have Hardware Acceleration? What flavor should I use? This is an attempt of a canonical answer. My answers have the "official minimal requirements", the recommended are a mix of official sources and opinion based (along with the answer it's told the source). You can comment or edit if you feel that the information is obsolete or incomplete. Is a good rule of thumb that any system capable to run Windows Vista, 7, 8 x86 OS X will almost always be a lot faster with any Ubuntu flavor even if they are lower-spec than described below.

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  • Advantages of Using Directory Submission Service

    Directory Submission Service is an art which includes submitting your website, blog or page to many online directories. For example yellow pages and Google Directory. The basic purpose of Directory Submission Service is to enhance online exposure of your website, business or services. Usually this process ends up with attracting more potential customer towards your website. In this way you can generate more sales and sell more services through your website because most of the customers who are visiting your website are potential customers who need these services.

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  • How to Submit to an Environmental Directory

    Environmental directory is a niche directory that offers inclusion for sites in the environment niche such as agriculture, environmental issues, oceans, sciences, climate change, energy, wildlife and etc. Most environment directories are maintained by a non profit organization. The main purpose of the environmental directory is to provide access of environmental resources to the public.

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  • Using Directory Submission Service to Improve Search Engine Ranking

    So generally speaking a web directory is just like your phone directory but the difference is that it contains links of different websites rather than phone numbers. The Directory Submission Service providing websites put your information in different categories which match your expertise or products or services that you provide. In this way it becomes easier for a particular customer to reach your website when he searches for a particular product or service that he needs.

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  • Is there a way of leveling/compressing the sound system-wide?

    - by JethroDawnfine
    As a Laptop user, I'm sure that a lot of people, even the ones using Netbooks would have already gone through this problem. Especially when listening to podcasts, and using it as an example, the sound might have loud moments and quiet moments, one person speaking loud and the other speaking very quiet in the same episode. Thereby, I always wanted the sound to be compressed system-wide, and I just noted the other day, that in Windows, some Realtek drivers already offer this function. We have already a pulseaudio plugin for equalization system-wide, and although it still has problems like not letting us change its values and listen the change in real time, or cracking the sound while changing pulse volume, I do love it and use it. Now I'm just missing something to keep the sound around 0db (or near the volume level you're using) as a leveler plugin for pulseaudio. Any suggestion?

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  • Why do System.IO.Log SequenceNumbers have variable length?

    - by Doug McClean
    I'm trying to use the System.IO.Log features to build a recoverable transaction system. I understand it to be implemented on top of the Common Log File System. The usual ARIES approach to write-ahead logging involves persisting log record sequence numbers in places other than the log (for example, in the header of the database page modified by the logged action). Interestingly, the documentation for CLFS says that such sequence numbers are always 64-bit integers. Confusingly, however, the .Net wrapper around those SequenceNumbers can be constructed from a byte[] but not from a UInt64. It's value can also be read as a byte[], but not as a UInt64. Inspecting the implementation of SequenceNumber.GetBytes() reveals that it can in fact return arrays of either 8 or 16 bytes. This raises a few questions: Why do the .Net sequence numbers differ in size from the CLFS sequence numbers? Why are the .Net sequence numbers variable in length? Why would you need 128 bits to represent such a sequence number? It seems like you would truncate the log well before using up a 64-bit address space (16 exbibytes, or around 10^19 bytes, more if you address longer words)? If log sequence numbers are going to be represented as 128 bit integers, why not provide a way to serialize/deserialize them as pairs of UInt64s instead of rather-pointlessly incurring heap allocations for short-lived new byte[]s every time you need to write/read one? Alternatively, why bother making SequenceNumber a value type at all? It seems an odd tradeoff to double the storage overhead of log sequence numbers just so you can have an untruncated log longer than a million terabytes, so I feel like I'm missing something here, or maybe several things. I'd much appreciate it if someone in the know could set me straight.

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  • Do I have to prepare Active Directory prior to installing an Exchange service pack?

    - by music2myear
    I'm having trouble determining the proper procedure for installing Exchange 2007 sp3 on a Server 2008 R2 box running Exchange 2007 sp1. It is not clear on websites I have consulted (Microsoft TechNet and others) whether preparing Active Directory is only required on a NEW install of Exchange 2007 sp3, or if it is required when upgrading an existing Exchange 2007 install to sp3. Could someone who has experience with this please set me straight?

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