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• Functional Programming - Lots of emphasis on recursion, why?

  - by peakit

  I am getting introduced to Functional Programming [FP] (using Scala). One thing that is coming out from my initial learnings is that FPs rely heavily on recursion. And also it seems like, in pure FPs the only way to do iterative stuff is by writing recursive functions. And because of the heavy usage of recursion seems the next thing that FPs had to worry about were StackoverflowExceptions typically due to long winding recursive calls. This was tackled by introducing some optimizations (tail recursion related optimizations in maintenance of stackframes and @tailrec annotation from Scala v2.8 onwards) Can someone please enlighten me why recursion is so important to functional programming paradigm? Is there something in the specifications of functional programming languages which gets "violated" if we do stuff iteratively? If yes, then I am keen to know that as well. PS: Note that I am newbie to functional programming so feel free to point me to existing resources if they explain/answer my question. Also I do understand that Scala in particular provides support for doing iterative stuff as well.

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• When using a package or framework is there a standard way to use version control?

  - by PurplePilot

  i.e. Do you put the whole package under VCS or just the components you are programming? Packages by there nature will get upgraded and that code will need to be added into the VCS, plus there is a lot of code that is static. Specifically I am going to be working on Joomla, adding and building modules, customising modules and the look and feel. Initially this will be just me but will expand to possibly two more developers as the project ramps up. My reaction would be just to VCS the lot, it means that i know it is all there and deployment via CI is easier(?). The alternative is to exclude the bulk of the code that is not being altered which could be error prone and laborious. As there is not a specific answer for this and i am looking for either experience or best practice advice i have marked it community wiki.

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• What happened to Perl?

  - by llasa

  I will try to keep this as objective as possible. I've been dealing with PHP since 3 years know, I have always known of Perl but never really "dived" into it. So I took a look at some Perl code examples and I thought: Wow, It's like PHP just failed at cloning it. My questions are: What is bad about Perl? What are the disadvantages that made it so extremely unpopular so that it is actually dying right know? Why could PHP take over? What does PHP have (or what did it have in the times of PHP4) that made it rise in popularity compared to Perl? I'm rather young and the questions above are a bit subjective and I think you can only really answer them when you have experienced the rise of PHP along with the fall of Perl. Unless my question before I hope that this one here can be more or less completely answered. There have to be definite disadvantages Perl has compared to PHP that made it fall.

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• Limitations in running Ruby/Rails on windows

  - by johnc

  In the installation documentation to RoR it mentions that there are many limitations to running Ruby on Rails on Windows, and in some cases, whole libraries do not work. How bad are these limitations, should I always default to Linux to code / run RoR, and is Iron Ruby expected to fix these limitations or are they core to the OS itself? EDIT Thanks for the answer around installation and running on Linux, but I am really trying to understand the limitations in functionality as referenced in the installation documentation, and non-working libraries - I am trying to find a link to the comment, but it was referenced in an installation read me when I installed the msi package I think

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• Google Visualization legend format Jquery ui tabs

  - by Liam

  I've got an issue when using the Google Visualization api line chart with Jquery ui tabs. I've got two graphs on two tabs. The first graph, which is visible by default displays fine: the second chart on the hidden tab seems to be messing up the key: I've tried changing the options but nothing I do seems to make any difference. Here are my options: options = { 'title': title, titleTextStyle: { color: color, fontSize: 20 }, 'width': 950, 'height': 400, hAxis: { minorGridlines: { count: x } }, chartArea: { width: 880 }, legend: { position: 'bottom', textStyle: { fontSize: 10 } } }; // Instantiate and draw our chart, passing in some options. var chart = new google.visualization.LineChart(document.getElementById(divId)); chart.draw(data, options); $('#tabs').tabs(); any thoughts on what is causing this and how to prevent it?? Edit If I remove the tabs() call it displays correctly. As per answer below from @Vipul tried setting the div to a fixed width, no difference.

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• What is technically more advanced: Python or Assembler? [closed]

  - by el ka es

  I wondered which of these languages is more powerful. With powerful I don't mean the readability, assembler would be naturally the winner here, but something resulting from, for example, the following factors: Which of them is more high-level? (Both aren't really but one has to be more) Who would be the possibly fastest in compiled state? (There is no Python compiler out there as far as I know but it wouldn't be hard writing one I suppose) Which of the both has the better code length/code action ratio? What I mean is If you get to distracted by the, compared to Python, improved readability of assembler, just think of writing plain binary/machine code as what assembler assembles to. Both languages are so basic that it should be possible to answer the question(s) in a rather objective view, I hope.

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• What's the easiest way to sort an EF4 EntityCollection<T>?

  - by Will

  I'd love to add some sorting to an EntityCollection that is bound to an ItemsControl (in xaml). I'd also like to do it as simply as possible. It appears that this is not possible. If I wrap the collection in a "sorted" version of the collection property within the Entity I lose collection change notifications. I can't use a CollectionViewSource because the entity collection's BindingListCollectionView does not support sorting for some goddamned reason (note: I've seen the blog post with the "dirty" hack to get around this, so please don't answer with that kthx). Is there a simple (couple lines of xaml, couple lines of code, whatever) way to achieve this??

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• Accessing HTTP status code while using WCF client for accessing RESTful services

  - by Hemant

  Thanks to this answer, I am now able to successfully call a JSON RESTful service using a WCF client. But that service uses HTTP status codes to notify the result. I am not sure how I can access those status codes since I just receive an exception on client side while calling the service. Even the exception doesn't have HTTP status code property. It is just buried in the exception message itself. So the question is, how to check/access the HTTP status code of response when the service is called.

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• Create a mirrored linked list in Java

  - by glacier89

  Linked-List: Mirror Consider the following private class for a node of a singly-linked list of integers: private class Node{ public int value; public Node next; } A wrapper-class, called, ListImpl, contains a pointer, called start to the first node of a linked list of Node. Write an instance-method for ListImpl with the signature: public void mirror(); That makes a reversed copy of the linked-list pointed to by start and appends that copy to the end of the list. So, for example the list: start 1 2 3 after a call to mirror, becomes: start 1 2 3 3 2 1 Note: in your answer you do not need to dene the rest of the class for ListImpl just the mirror method.

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• will paginate, nested routes, ruby, rails

  - by Sam

  I'm trying to get will paginate to link to my nested route instead of the regular posts variable. I know I'm supposed to pass some params to paginate but I don't know how to pass them. Basically there is an array stored in @posts and the other param paginate has access to is category_id. The nested route is /category/1/posts but hitting next and previous on will paginate returns a url like this posts?page=1&category_id=7. <%= will_paginate @most_recent_posts "What do I do here?" %> This is the result of Yannis's answer: In your controller you can do: @posts = @category.posts.paginate And in your view: <%= will_paginate(@post) %> Doing this comes up with the following URL posts?page=2&post_category_id=athlete_management routes.rb #there are more routes but these are the relevant ones map.resources :posts map.resources :post_categories, :has_many => :posts solution map.resources :post_categories do |post_category| post_category.resources :posts end map.resources :posts Had to declare the resource after the block Thanks stephen!

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• How to modyfy resource in a DLL from this DLL?

  - by CichyK24

  I'm writing an add-on for IE using VC++ and ATL. It's a simple DLL and I have a text file that I use as a resource. This answer helped me in doing this. I have a question about updating resource. MSDN describes how to do it but there is a function (BeginUpdateResource) that need filename of exe or dll with resource. Is it possible to update resource in my DLL from my DLL? I can easily read it that way, but to update I have to provide DLL's name. Is it necessary? Also if I won't give full path to my DLL it looks for file on desktop and not where DLL is stored. I don't know why this behave like this.

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• Prevent Character Escape When Calling xmlwriter.xwriter.WriteElementString, C%

  - by Ibrar Afzal

  I have a string <entry key="Provider">Comcast Cable Communications, Inc.</entry> <entry key="Challenged">No</entry> I need to call the using xmlwriter..WriteElementString I need to what the string mentioned earler. Problem here is the xwriter.WriteElementString will escape all "<" and "" symbols with &lt and &gt. I have checked MSDN to see if there is a way to disable it, but have not found an answer. Is there a way to disable the auto-escape features?

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• Database with users design

  - by 1110

  I am in database design development phase. Application will work with large number of users (LARGE :)) I designed 80% of database but I have one Users table which is connected to everything else: Users {UserId, FirstName, LastName, Username, Password, PasswordQuestion, PasswordAnswer, Gender, RoleId, LastLoginDate etc etc} I saw asp.net membership database structure where Users and Membership are two tables. My questions are: Should I use one users table with all users data in it or more tables? If answer is 'more tables', what tables to use? Any advice on how to structure relation between those tables? This is sample relation that I have, and trying to improve. I don't understand why user and userChild are separated tables?

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• How would you go about tackling this problem?

  - by incrediman

  I have a programming contest coming up in about half a week, and I've been prepping :) I found a bunch of questions from this canadian competition, they're great practice: http://cemc.math.uwaterloo.ca/contests/computing/2009/stage2/day1.pdf I'm looking at problem B ("Dinner"). Any idea where to start? I can't really think of anything besides the naive approach (ie. trying all permutations) which would take too long to be a valid answer. Btw, the language there says c++ and pascal I think, but i don't care what language you use - I mean really all I want is a brief description of how to tackle the problem. Like "use X technique treating each programmer as a Y" or something :)

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• Trouble using opaque pointers in Objective C++

  - by morgancodes

  The answer to this quesion explains that opaque pointers are a good way to include C++ member variables in an Objective C++ header. I'm getting compile errors when trying to follow the example. Here's the relevant code from my header, with the corresponding compiler errors shown as comments: struct ADSR_opaque; // error: forward declaration of 'struct ADSR_opaque' @interface LoopyPulser : NSObject{ float _pulseRate; UInt32 tickInterval; UInt32 step; InMemoryAudioFile * audioFilePlayer; ADSR_opaque* env; // error: expected specifier-qualifier-list before 'ADSR_opaque' Pattern * pattern; float loopLengthRatio; float volume; } Is there something simple I'm doing wrong here?

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• How to get a clipboard paste notification and provide my own data?

  - by Uwe Keim

  For a small utility I am writing (.NET, C#), I want to monitor clipboard copy operations and clipboard paste operations. My idea is to provide my own data when pasting into an arbitrary application. The monitoring of a copy operation can be easily done by using a clipboard viewer. Something that seems much more advanced to me is to write a "clipboard paste provider": Answer to "what formats are available" queries of applications. Supply data to application paste operations. I found this posting and this posting, but none of them seems to really help me. What I guess is that I somehow have to mimic/hijack the current clipboard. Question: Is it possible to "wrap" the clipboard in terms of paste operations and provide my own kind of "clipboard proxy"? Thanks Uwe

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• NHibernate's automatic (dirty checking) update behaviour - turning it off

  - by Andrew Bullock

  I've just discovered that if I get an object from an NHibernate session and change a property on object, NHibernate will automatically update the object on commit without me calling Session.Update(myObj)! I can see how this could be helpful, but as default behaviour it seems crazy! How can I stop this happening? Is this default NHib behaviour or something coming from Fluent NHibs AutoPersistenceModel? If there's no way to stop this, what do I do? Unless I'm missing the point this behaviour seems to create a right mess, violating my UoW. Im using NHibernate 2.0.1.4 and a Fluent NHib build from 18/3/2009 Edit, is this guy right with his answer? Edit: I've also read that overriding an Event Listener could be a solution to this. However, IDirtyCheckEventListener.OnDirtyCheck isn't called in this situation. Does anyone know which listener I need to override? Thanks Andrew

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• how to programming SYSTEM for reading_comperhension question in English.

  - by michael123

  hi , i have to do some study for reading_comperhension in English. my work is ok but there is part from natural language - nlp area that i have to used . i want some help about QAsystem , how to answer the reading_comperhension automaticly .i have simple system about it that i get from this website http://www.cs.utah.edu/contest/2003/ , there is simple system in java but did not work to my i try to load the file from Remedia dataset that have the reading_comperhension story, but no result. after run this system , i have to develop by current technique such as rule based or pattern machine or combined with simple named entity.how to make that and which of them is petter to combined with the QAsys. thank you

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• Add new row: ListView vs. DataGrid

  - by Shimmy

  Hello! I have been looking around and even found a couple of related answers and didn't get a certain answer to my question. Is there a way to have in the WPF ListView an additional row like in a DataGrid? I prefer using the ListView since I use 3.5 and the DataGrid is not officially in the box and has many quirks. I would prefer using the ListView if there is an official option to add new rows or else I use the DataGrid. Thanks a lot.

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• Problem passing ELMAH log id to Custom Error page in ASP.NET

  - by Ronnie Overby

  I am using ELMAH to log unhandled exceptions in an ASP.NET Webforms application. Logging is working fine. I want to pass the ELMAH error log id to a custom error page that will give the user the ability to email an administrator about the error. I have followed the advice from this answer. Here is my global.asax code: void ErrorLog_Logged(object sender, ErrorLoggedEventArgs args) { Session[StateKeys.ElmahLogId] = args.Entry.Id; // this doesn't work either: // HttpContext.Current.Items[StateKeys.ElmahLogId] = args.Entry.Id; } But, on the Custom error page, the session variable reference and HttpContext.Current.Items are giving me a NullReference exception. How can I pass the ID to my custom error page?

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• How (and where) to get aligned tRNA sequences (and import it into R)

  - by Tal Galili

  (This is a database / R commands question) I wish (for my thesis work), to import tRNA data into R and have it aligned. My questions are: 1) What resources can I use for the data. 2) What commands might help me with the import/alignment. So far, I found two nice repositories that holds such data: http://trnadb.bioinf.uni-leipzig.de/Resulthttp://trnadb.bioinf.uni-leipzig.de/Result http://gtrnadb.ucsc.edu/download.htmlhttp://gtrnadb.ucsc.edu/download.html And also the readFASTA command from Biostrings, that does basic importing of the data into R. My problem still remains with how to handle the alignment of the tRNA. Since I am not from the field, I might be missing a very basic answer (like where I should download the data from, or what command to use). If you might be willing to advice me, that would be most helpful. Many thanks in advance, Tal

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• Switching from web to desktop development

  - by Dziamid

  Being a web developer (php, symfony, doctrine) for 2 years now, I was recently asked by a friend to come up with a desktop solution. So I developed a project, installed a LAMP on his machine and he is mostly happy using it now. But I'm not. It just doesn't seem right to wait for a server response from a localhost. Obviously php isn't suited for desktop development. So, my question is: what language \ framework would you advice a php programmer if he was going to develop a desktop application (something that you can install, that has it's own gui, but utilizes the similar concepts of web apps: css, javascript, orm). I would like to bring up Python as a possible answer to my question. Does anyone have an experience of developing a desktop app with Python, utilizing an ORM and(or) HTML-based GUI?

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• Google suggest API does not work with Chinese locale

  - by SadSido

  Hi, everyone! I have a problem with Google suggest API when using Chinese locale. I am picking Chinese hieroglyphs at random and use the REST API to retrieve suggestions. Unfortunately, Google always return an empty list of suggestions (I am completely sure, that I convert my request in utf-8, and it is working fine with other languages, ex. Russian): Sample request: http://suggestqueries.google.com/complete/search?qu=%E9%80%9F Google answer: window.google.ac.h(["?",[]]) Does anyone know how to retrieve suggestions for Chinese locale? Maybe I am missing some flags or something? Maybe there is an official document from Google, saying that Chinese is not supported? And are there any people from China, using Google toolbar? Does it really work? I'd appreciate any help! If it matters, I am writing a simple WinAPI application, using C++...

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• RSA encrypted Diffie-Hellman handshake

  - by cmaduro

  Would a RSA encrypted Diffie-Hellman handshake enable secure communication? I'm encrypting communication from a silverlight client to a php webservice. The silverlight client initiates they key agreement by sending the RSA public key encrypted DH parameters to the webservice. Only the webservice has the private key, so a MITM attack is not possible. The webservice sends plain text answer back to the client, and a key is agreed upon. This key is then used to encrypt communication between the webservice and silverlight client with AES, which is also encrypted with the RSA public key. Does anyone see a flaw?

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• convert object to array

  - by zahir hussain

  <?php print_r($response->response->docs); ?> display the following Array ( [0] => Object ( [_fields:private] => Array ( [id]=>9093 [name]=>zahir) Object ( [_fields:private] => Array ( [id]=>9094 [name]=>hussain)..) how to change the object to array... i want the following Array([0]=>([id]=>9093 [name]=>zahir) [1]=>([id]=>9094 [name]=>hussain)...) can i do? no one can answer....

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