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• Sorting data by relevance, from multiple tables

  - by Oden

  Hey, How is it possible to sort data from multiple tables by relevance? My table structure is following: I have 3 tables in my database, one table contains the name of solar systems, the second for e.g. of planets. There is one more table, witch is a connection between solar systems and planets. If I want to get data of a planet, witch is in the Milky Way, i post this data to the server, and it gives me a multi-dimensional array witch contains: The Milky Way, with every planet in it Every planet, witch name contains the string Milky Way (maybe thats a bat example because i don't think that theres but one planet with this name, but the main concept is on file) But, i want to set the most relevant restaurants to the top of the array. (for the relevance i would check the description of the restaurants or something like that) So, how would you do that kind of data sorting?

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• How to Format Code in Research Reports

  - by RoseOfJericho

  I am currently writing a formal research report, and I'll be including code with this report. Question: Is there an accepted way of displaying code in research reports? I'm thinking both in terms of font, spacing, et cetera, and whether the code should be displayed inside the document, or in an appendix. The code will be JavaScript and PHP. None of the sections of code will be more than 25 lines (so they're mere snippets). There will be approx. half a dozen snippets. Each of the snippets will have a couple of paragraphs explaining what is happening in the code, and a discussion on its pros/cons. I have no contact with the body the report will be submitted to, and they have no published guidelines on how to format code (please do not question these points). Any help considered and appreciated.

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• Haskell - Parsec Parsing <p> element

  - by Martin

  I'm using Text.ParserCombinators.Parsec and Text.XHtml to parse an input like this: This is the first paragraph example\n with two lines\n \n And this is the second paragraph\n And my output should be: <p>This is the first paragraph example\n with two lines\n</p> <p>And this is the second paragraph\n</p> I defined: line= do{ ;t<-manyTill (anyChar) newline ;return t } paragraph = do{ t<-many1 (line) ;return ( p << t ) } But it returns: <p>This is the first paragraph example\n with two lines\n\n And this is the second paragraph\n</p> What is wrong? Any ideas? Thanks!

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• Language to learn metaprogramming

  - by Erup

  What's the best language (in terms of simplicity, readability and code elegancy) in your opinion, to learn and work with metaprogramming? I think metaprogramming is the "future of coding". Not saying that code will extinct, but we can see this scenario coming on new technologies.

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• What applications is Python optimal for?

  - by Alan

  I'm already a professional J2EE developer by day, and Rails developer by night. I'm planning on adding Python to my list of skills. I'm already convinced a language is just a tool, so I'm not interested in a religious war. I agree with the Pragmatic Programmers that learning one language/year is a good thing for your professional development So, in your considered opinion, what kinds of applications does Python hit the sweet spot? And why? What advantages does it have, and why do these advantages outweigh the costs in adopting Python? ADD: I also plan on learning a pure functional language like Scheme.

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• Java compilers or JVM languages that support goto?

  - by unknown

  Is there a java compiler flag that allows me to use goto as a valid construct? If not, are there any third-party java compilers that supports goto? If not, are there any other languages that support goto while at the same time can easily call methods written in Java? The reason is I'm making a language that is implemented in Java. Gotos are an important part of my language; I want to be able to compile it to native or JVM bytecode, although it has to be able to easily use Java libraries (ie. C supports goto, but to use it I'd have to rewrite the libraries in C). I want to generate C or Java, etc source files, and not bytecode or machine code. I'm using a third-party compiler to do that.

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• awk can and perl cannot

  - by alvin

  somewhere i read about one specific feature present in awk which is absent in perl. failed in locating it again. would appreciate it, if anyone of you could remember. (yep, this might be a useless trivia.) but still curious.

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• What is the best Linux distribution as a Xen host?

  - by St3fan

  I ordered a server for the home office and I would like to partition it with Xen. I think this will keep things clean and easier to maintain. I will be running things like MySQL, PostgreSQL, Tomcat and my own code on this machine. My question is: what freely available Linux distribution has the best Xen hosting facilities?

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• Appending an element to a collection using LINQ

  - by SRKX

  I am trying to process some list with a functional approach in C#. The idea is that I have a collection of Tuple<T,double> and I want to change the Item 2 of some element T. The functional way to do so, as data is immutable, is to take the list, filter for all elements where the element is different from the one to change, and the append a new tuple with the new values. My problem is that I do not know how to append the element at the end. I would like to do: public List<Tuple<T,double>> Replace(List<Tuple<T,double>> collection, T term,double value) { return collection.Where(x=>!x.Item1.Equals(term)).Append(Tuple.Create(term,value)); } But there is no Append method. Is there something else?

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• What's the Java equivalent of the term "pythonic"?

  - by Chris Sears

  If I wanted a single word that meant "conforming to Java language conventions", what would that be? Python has the term "pythonic". Would it be "javaish"?

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• Prolog: using the sort/2 predicate

  - by Øyvind Hauge

  So I'm trying to get rid of the wrapper clause by using the sort library predicate directly inside split. What split does is just generating a list of numbers from a list that looks like this: [1:2,3:2,4:6] ---split-- [1,2,3,2,4,6]. But the generated list contains duplicates, and I don't want that, so I'm using the wrapper to combine split and sort, which then generates the desired result: [1,2,3,4,6]. I'd really like to get rid of the wrapper and just use sort within split, however I keep getting "ERROR: sort/2: Arguments are not sufficiently instantiated." Any ideas? Thanks :) split([],[]). split([H1:H2|T],[H1,H2|NT]) :- split(T,NT). wrapper(L,Processed) :- split(L,L2), sort(L2,Processed).

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• Tips for learning MUMPS (M) / Cache?

  - by Jake

  I'm interested in getting involved/up to speed on VistA, the Veterans' Administrations open source medical records system. To that effect, I understand I should learn the MUMPS (M) language upon which the software is based. Does anyone have any getting started tips or book recommendations on this language and environment? Any tips on getting up to speed on VistA is appreciated as well. Audience: experienced developer/consultant. Thanx in adv.

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• Bi-directional communication with 1 socket - how to deal with collisions?

  - by Zwei Steinen

  Hi, I have one app. that consists of "Manager" and "Worker". Currently, the worker always initiates the connection, says something to the manager, and the manager will send the response. Since there is a LOT of communication between the Manager and the Worker, I'm considering to have a socket open between the two and do the communication. I'm also hoping to initiate the interaction from both sides - enabling the manager to say something to the worker whenever it wants. However, I'm a little confused as to how to deal with "collisions". Say, the manager decides to say something to the worker, and at the same time the worker decides to say something to the manager. What will happen? How should such situation be handled? P.S. I plan to use Netty for the actual implementation. Thank you very much in advance!

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• Is PHP still basically Procedural Overall?

  - by coffeeaddict

  I know PHP 5 has some object oriented similarities but it's not a true OOP environment still right? Also does it have a true compiler? I see compiling of scripts which still means procedural. I assume it's not a real compiler in that any PHP compilers out there do not create assemblies?

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• cons operator (::) in F#

  - by Max

  The :: operator in F# always prepends elements to the list. Is there an operator that appends to the list? I'm guessing that using @ operator [1; 2; 3] @ [4] would be less efficient, than appending one element.

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• Why doesn't infinite recursion hit a stack overflow exception in F#?

  - by Amazingant

  I know this is somewhat the reverse of the issue people are having when they ask about a stack overflow issue, but if I create a function and call it as follows, I never receive any errors, and the application simply grinds up a core of my CPU until I force-quit it: let rec recursionTest x = recursionTest x recursionTest 1 Of course I can change this out so it actually does something like this: let rec recursionTest (x: uint64) = recursionTest (x + 1UL) recursionTest 0UL This way I can occasionally put a breakpoint in my code and see the value of x is going up rather quickly, but it still doesn't complain. Does F# not mind infinite recursion?

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• How to initialize F# list when size is unknown, using while..do loop

  - by James Black

  I have a function that will parse the results of a DataReader, and I don't know how many items are returned, so I want to use a while..do loop to iterate over the reader, and the outcome should be a list of a certain type. (fun(reader) -> [ while reader.Read() do new CityType(Id=(reader.GetInt32 0), Name=(reader.GetString 1), StateName=(reader.GetString 2)) ]) This is what I tried, but the warning I get is: This expression should have type 'unit', but has type 'CityType'. Use 'ignore' to discard the result of the expression, or 'let' to bind the result to a name. So what is the best way to iterate over a DataReader and create a list?

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• Suitable compiled language for new project [closed]

  - by Toby

  Hello, I'm about to develop some commercial software that will run on OSX and Linux. The program will be doing some heavy string manipulation, base64 encoding, zlib compression and may require http libraries in the future. Does anyone have a suggestion? Many thanks in advance, Toby.

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• Has anyone "learned how to program in 21 days?"

  - by Sheehan Alam

  I'm not a fan of these learn how to program in X amount of days books. Some even boast, learn how to program in 24 hours. This is a joke and an insult to me as a software engineer who went through a rigorous discipline in computer science and mathematics. So a question to the community, have you benefited from these become a programmer quick books?

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• How to learn a language that has very little coverage?

  - by bennybdbc

  I recently came across the Kogut language, and was interested by it. However, the only website to gain information from is the sourceforge page that hosts the project. I had no idea how to even attempt to look at the language in more depth. So what I'm asking is, has anyone here learnt a language that doesn't have the thousands of resources that Ruby, Python etc. have? What would be the best method to do so?

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• Getting HWND of current Process

  - by Arman

  I have a process in c++ in which I am using window API. I want to get the HWND of own process. Kindly guide me how can I make it possible.

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• Is transmitted bytes event exist in Linux kernel?

  - by alnet

  I need to write a rate limiter, that will perform some stuff each time X bytes were transmitted. The straightforward is to check the length of each transmitted packet, but I think it will be to slow for me. Is there a way to use some king of network event, that will be triggered by transmitted packets/bytes?

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• How to get an internship with a low GPA?

  - by Jason Baker

  A lot of changed majors and some other mitigating circumstances have left me with a pretty low GPA. My GPA in the last couple of semesters hasn't been stellar, but my grades have gotten a LOT better. I want to try and start putting in some resumes to get a good internship this summer. I do think that I have some decent experience for someone at my level, but I see my GPA being a pretty big potential stumbling block. Is there anything I can do to help my chances of getting a good internship? (For the record, the mitigating circumstances aren't something I'd feel comfortable discussing with a potential employer. I'd prefer getting a job by proving my merit, not making excuses.)

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• F# - core benefits

  - by David Neale

  Since the release of VS 2010 I've seen F# more strongly advertised by Microsoft. What are the core benefits of using this language? What problems does it most naturally lend itself to? What is the learning curve like?

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• Haskell map function with predicate

  - by Paul

  I feel like this should be fairly obvious, or easy, but I just can't get it. What I want to do is apply a function to a list (using map) but only if a condition is held. Imagine you only wanted to divide the numbers which were even: map (`div` 2) (even) [1,2,3,4] And that would give out [1,1,3,2] since only the even numbers would have the function applied to them. Obviously this doesn't work, but is there a way to make this work without having to write a seperate function that you can give to map? Filter is almost there, except I also want to keep the elements which the condition doesn't hold for, and just not apply the function to them. Thanks

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