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• Problem with text deletion in vi editor

  - by user184256

  When I am writing C code on the vi editor, I am not able to use the backspace keys or my arrow keys to delete or navigate through lines. Some unexpected special characters occur on the screen that is on middle of my code and I am not able to delete them also. If I use my delete key, the whole code gets deleted. I have tried both insert mode using 'i' and 'a'. I am able to manage this situation for C programming by using the text editors but when I am creating LeX and yacc programs, I find this awkward. Can you please help me with this?

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• Project management without experience

  - by Raven13

  I'm a web developer who is part of a three-man team that has been tasked with a rather large and complex development project. Other than some direction and impetus from management, we're pretty much on our own to develop the new website. None of us have any project management experience nor do my two coworkers seem like they would be interested in taking on that role, so I feel like it's up to me to implement some kind of structure to the development process in order to avoid issues down the road. My question is: what can I do as a developer without project managment experience to ensure that our project gets developed successfully and avoid the pitfalls of developing a project without a plan?

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• How to use short breaks at work effectively for self-development?

  - by Alaudo

  At the moment my daily work as a developer requires me to have short 10-20 min breaks after every 2-3 hours. It would be nice if I could use those effectively to improve my expertise in programming or CS in general. I tried several things: Reading jokes online gets boring very soon. Trying to solve some (even the most simple) tasks from different code contests requires more time, as long as I have some idea of an algorithm the time is over. Reading a randomly picked Wikipedia-article about Computer Science: depending upon the article sometimes it requires more time and is not an easy reading for a break. So, I ended up reading StackOverflow questions and answers with most votes: that is entertaining and educative. Do you have any other suggestions?

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• SFML: Monster following player on a straight line

  - by user3504658

  I've searched for this and found a few topics , usually they used a function normalize and using simple vector subtracting which is ok , but how should I do it in sfml ? Instead of using: Movement = p.position() - m.position(); p is the player and m is the monster I used something like this to move on a straight line: sf::Vector2f Tail(0,0); if((mPlayer.getPosition().y - mMonster.GetInstance().getPosition().y) >= (mPlayer.getPosition().x - mMonster.GetInstance().getPosition().x)){ //sf::Vector2f Tail(0,0); Tail.x = mPlayer.getPosition().x - mMonster.GetInstance().getPosition().x; } else if((mPlayer.getPosition().y - mMonster.GetInstance().getPosition().y) <= (mPlayer.getPosition().x - mMonster.GetInstance().getPosition().x)){ //sf::Vector2f Tail(0,0); Tail.y = mPlayer.getPosition().y - mMonster.GetInstance().getPosition().y; } if(!MonsterCollosion()) mMonster.Move(Tail * (TimePerFrame.asSeconds() * 1/2 ) ); It works ok if the the height = the width for the game window, although I think it's not the best looking game when it comes to a moving monster, since it starts fast and then it gets slower so what do you guys advise me to do ?

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• Wiki based requirements engineering tool

  - by Shanon

  Hi, I'm looking to to build a wiki based tool the helps/aides in the requirements engineering process. More specifically I am hoping to end up with a tool that helps inexperienced users easily create and design requirements documents on a wiki platform. I was wondering if there exist any wiki/wiki platforms that either already exist or are easily extendible or would be worth looking at that for this purpose. For instance some of the features I was hoping to add would be to add structure to a document so that information is filled out in a standardised manner. Another idea I was looking at was to somehow create relationships between different types of documents (for example- a goal diagram gets evolves/ helps in the development of the class diagram). So far I have come across FOSwiki which claims to to fully customisalble...but I'm not sure what it means and what I can really do with that. Any input on FOSwiki is also highly appreciated.

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• Designing a simple snake A.I

  - by DillPixel

  I've looked at some stuff online regarding this specific topic, and a lot of the info that I read involved graphs and path finding. I really don't want to get involved in something too complex & out of my level, and also I don't need my snake to be that intelligent (it will be a large board with the snake not growing in size on every munch). How could you structure a simpler AI for the snake that gets the job done relatively well? I would be able to get the snake to move towards the food item correctly, but my issue is that I'm not sure how to deal with the snake colliding with itself. Say the snake has a look ahead, and it finds that its tail is in the way, it could change direction, but what happens next? Any ideas on how to tackle this? Should the snake build an instruction set from every square, or should it think on the go?

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• What has been your experience with paid support from Canonical ?

  - by gabkdlly

  I am considering buying "Ubuntu Desktop Support" from Canonical for 2 reasons: I have a couple of issues that I would like professional help with. ( Specifically a recurring kernel panic, and a slow wireless connection. ) I would like to lend a helping hand toward supporting Ubuntu financially. However, I am a bit worried that once I transfer the money, they will end up just referring me to the bug tracker on Launchpad. Also, free support options like this site have the pleasant property that they are open to the internet, meaning that if my issue gets fixed, it is more likely to help others with the same problem. What does paying for support from Canonical actually get you ?

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• Placing of copyright notice in source code

  - by Diana Dcn

  I'm about to release a project of mine that I'm really proud of under the GNU GPL and I have some questions: Should one attach a copyright notice on each and every source code file from their project? I think it's a bit ridiculous to claim copyright on a 3 line abstract class. Should I attach a copyright notice only to really important source code files? Can I not attach the whole standard thingy? Because it's big and bulky and gets in the way... If so, is the variant below ok/enough? Copyright year firstname lastname. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation.

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• Disabling hardware checking in the start up

  - by sven

  I have a ubuntu (10.04) on my desktop and it doesn't have monitor. I would like to connect the desktop (ubuntu) via teamviewer from my laptop. However, when the PC is powered, pc gives an error about it could not find monitor and it gets stuck in this error and does not continue. Since the ubuntu started correclty, teamviewer doesnt start to work on ubuntu so that I can not connect to the ubuntu. How can I disable hardware/desktop checking at the startup, so that ubuntu would start normally then I can use teamviewer?

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• download file from web source, selectively

  - by KILL3RTACO

  If anyone has heard of Bukkit, you know that their files are usually of three types: Development, Beta, and Realease. Click (here) for examples. I need a script that: Loops through the directory Gets the latest Stable version (probably just as simple as looking at the version number as they have a simple naming convention, each stable version is succeeded by -Rx.0, while developmental and beta versions are succeeded by -Rx.x) After that I know I'll need to use wget to download the file. Note: If your just going to post code, at least tell me what it does so I can use it later if I need to

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• Self-documenting code vs Javadocs?

  - by Andiaz

  Recently I've been working on refactoring parts of the code base I'm currently dealing with - not only to understand it better myself, but also to make it easier for others who are working on the code. I tend to lean on the side of thinking that self-documenting code is nice. I just think it's cleaner and if the code speaks for itself, well... That's great. On the other hand we have documentation such as javadocs. I like this as well, but there's a certain risk that comments here gets outdated (as well as comments in general of course). However, if they are up-to-date they can be extremely useful of say, understanding a complex algorithm. What are the best practices for this? Where do you draw the line between self-documenting code and javadocs?

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• Keyboard Mouse Problem

  - by Zachary K

  I just installed Ubuntu on my laptop (Core 2 Duo Sony Vaio) and am having a problem with the external keyboard and mouse. When I first logged in the left mouse button does not work, this can be solved by unplugging the external keyboard/mouse's USB connector and then plugging it back in again. But Then randomly other problems happen. (Shift gets stuck, keys don't work etc) The keyboard and mouse are a generic brand wireless (A4 Tech) that I got for cheap. Both work OK under windows so this is a major pain.

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• Unity launcher autohide leaves "ghost" behind?

  - by Hailwood

  In 12.04 I had the launcher set to autohide, which worked perfectly. However in 12.10 I am getting a strange "ghost" issue. Take this screenshot, with me having a maximised google chrome window, mousing over the back button. As well as this, I also get another ghosting issue when I have the panel set with an opacity, whereby whatever is in approximately the middle left of the screen gets mirrored up to to panel, but only when I move/switch to a window. But that one is not so annoying as the autohide bug, how can I fix that?

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• Do PHP-FPM (and other PHP handlers) need execute permissions on the PHP files they're serving?

  - by Andrew Cheong

  I read in a post at Server Fault that PHP-FPM needs execute permissions. However, the answer in When creating a website, what permissions and directory structure? only grants read and write permissions to PHP-FPM. Maybe I don't quite understand how PHP handlers (or CGI in general) work, but the two claims seem contradictory to me. As I understand, when Apache / Nginx gets a request for foobar.php, it "passes" the file to an appropriate handler. That is, I imagine it's as if www-root (or apache or whomever the webserver's running as) were to run some command, /usr/sbin/php-fpm foobar.php Actually, no, that's naive, I just realized. PHP-FPM must be a running instance (if it's to be performant, and cache, etc.), so probably PHP-FPM is just being told, "Hey, quick, process this file for me!" In either case, I don't see why execute permissions are necessary. It's not like the webserver needs to literally execute the file, i.e. ./foobar.php Is the Server Fault answer simply mistaken?

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• Set secondary receiver in PayPal Chained Payment after the initial transaction

  - by CJxD

  I'm running a service whereby customers seek the services of 'freelancers' through our web platform. The customer will make a 'bid' which is immediately taken from their accounts as security. Once the job is completed, the customer marks it as accepted and the bid gets distributed to the freelancer(s) as a reward. After initially storing these rewards in the accounts of the freelancers and relying on MassPay to sort out paying them later, I realised that your business needs to be turning over at least £5000/month before MassPay is switched on. Instead, I was referred to Delayed Chained Payments in PayPal's Adaptive Payments API. This allows the customer to pay the primary receiver (my business) before the payment is later triggered to be sent to the secondary receivers (the freelancers). However, at the time that the customer initiates this transaction, you must understand that nobody yet knows who will receive the reward. So, before I program this whole Adaptive Payments system, is it even possible to change or add the secondary receivers after the customer has paid? If not, what can I do?

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• My First robots.txt

  - by Whitechapel

  I'm creating my first robots.txt and wanted to get a second opinion on it. Basically I have a FTP setup on my board for some special users to transfer files between each other and I do NOT want that included in the search by the bots. I also want to point to my sitemap which gets auto generated by a PHP page. So here is what I have, what else should I include, and if I need to fix anything with it? Also, it's linking to xmlsitemap.php because that generates the sitemap when called. My goal is to allow any search bot crawl the forums to grab meta data. User-agent: * Disallow: /admin/ Disallow: /ali/ Disallow: /benny/ Disallow: /cgi-bin/ Disallow: /ders/ Disallow: /empire/ Disallow: /komodo_117/ Disallow: /xanxan/ Disallow: /zeroordie/ Disallow: /tmp/ Sitemap: http://www.vivalanation.com/forums/xmlsitemap.php Edit, I'm not sure how to handle all the user's folders under /public_html/ since the robots.txt will be going in /public_html.

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• Developing a computer system based on Nand2Tetris [on hold]

  - by Ryan

  I recently finished a book called Nand2Tetris (nand2tetris.org) where I built my own computer system from scratch with its own machine language, assembly code, and a high level language called Jack that's translated to Hack binary. However, I feel like the "computer" I built throughout the course of this book (called the Hack computer) is a bit too simple for various reasons: 1) There are only two registers (D and A), whereas most computers have much more 2) Peripheral devices like mouse and keyboard have to be directly implemented 3) Peripheral devices use a pre-planned shared memory map to communicate with the CPU instead of using interrupts (which aren't covered at all) 4) Jack (the high level language) code doesn't compile to Assembly code directly, instead it compiles to an intermediate language, which in turn gets translated to Assembly. 5) There is no ROM or permanent storage device, everything is stored in RAM 6) No support for colored monitor, networking or sound I would like to build a more complicated computer system now based on what I've learned from Nand2Tetris. Does anyone know of any good resources or books to get started on this? (BTW by computer system I mean software that can emulate the hardware of a virtual computer with its own unique instruction set)

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• How can I store all my level data in a single file instead of spread out over many files?

  - by Jon

  I am currently generating my level data, and saving to disk to ensure that any modifications done to the level are saved. I am storing "chunks" of 2048x2048 pixels into a file. Whenever the player moves over a section that doesn't have a file associated with the position, a new file is created. This works great, and is very fast. My issue, is that as you are playing the file count gets larger and larger. I'm wondering what are techniques that can be used to alleviate the file count, without taking a performance hit. I am interested in how you would store/seek/update this data in a single file instead of multiple files efficiently.

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• Can 302 redirect on wordpress homepage affect SEO?

  - by user2402116

  I manage a website. In order to lead the visitor to the latest post when entering the website, I set a 302 redirect from the homepage URL to the latest post URL. There's 1 to 2 posts a month so the redirection is made manually each time a new post gets published. Despite the website registration on google it doesn't get indexed at all. After searching for some solution on blogs and forums I understood this issue might be related to the 302 redirection. It's the first time I use redirections on a website, can someone help me?

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• How to keep a big and complex software product maintainable over the years?

  - by chrmue

  I have been working as a software developer for many years now. It has been my experience that projects get more complex and unmaintainable as more developers get involved in the development of the product. It seems that software at a certain stage of development has the tendency to get "hackier" and "hackier" especially when none of the team members that defined the architecture work at the company any more. I find it frustrating that a developer who has to change something has a hard time getting the big picture of the architecture. Therefore, there is a tendency to fix problems or make changes in a way that works against the original architecture. The result is code that gets more and more complex and even harder to understand. Is there any helpful advice on how to keep source code really maintainable over the years?

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• Chrome + Touchscreen + Unity (14.04)

  - by Luis Fernando P. Gonzalez

  I've got a Dell 14R with touchscreen with Ubuntu 14.04. When I start Google Chrome by clicking the launcher with the TouchPad or with the Super+ combination, touch support in Chrome doesn't work. When I touch some element, it only gets focus, but doesn't activate the element (button, field, etc). And touch gestures don't work. In the other hand, if I start Chrome by touching the launcher button, touch scroll works in Chrome, even flicking to left does back to the previous page, etc. It doesn't makes sense to me, but is always like this, even across reboots. Anyone can confirm this? Any idea on how to fix?

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• How to fix the copy/paste-pattern?

  - by Lenny222

  Where i work, people (consultants) feel pressed to release features as fast as possible. So instead of spending too much time on thinking about how to do things the right way or because they don't want to break anything, code gets copied from different modules and modified. It's not easy to prevent this, since the code base is open to the whole company. Lots of people work on this. Now that the mess is there already, what is the best way to remove those redundancies without breaking too much?

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• After changing web host, I get a 'file does not exist' error

  - by Jordan

  I run a WordPress blog, and have recently changed web hosts. When changing web hosts, I copied all files and exported/imported the database etc as explained by lots of tutorials found easily on Google. The blog home page works fine. What goes wrong: When I click on any link from the home page, the browser gets stuck in a redirect loop. Looking at the error log, I see: File does not exist: /usr/local/apache/htdocs/index.php The directory /usr doesn't even exist for my website - so perhaps this is looking for a file that was present using my old Web Host and is no longer present with my new web host? What is going on, and how might I resolve it?

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• Will moving to Facebook/Disqus Commenting lighten the load on my server any?

  - by sublet

  I manage a site that gets about 50 million hits a month. It's a Wordpress site, load balanced over 6 servers, and has a varnish caching system setup. Right now, 95 - 97% of the time, page views hit the cache. The only time it serves up a new page from the server is when a new story is created, or someone is logged in looking at the stories and commenting. What I am trying to figure out is that if I move over to Facebook Comments or Disqus commenting, and get rid of the users entirely, will that lighten the load? I would think it would because the only time you would be hitting the server, and not the cache, is when you're logged in - which only the admins would be. I know it's only 2.5 - 3% but I wasn't 100% sure.

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• Getting isometric grid coordinates from standard X,Y coordinates

  - by RoryHarvey

  I'm currently trying to add sprites to an isometric Tiled TMX map using Objects in cocos2d. The problem is the X and Y metadata from TMX object are in standard 2d format (pixels x, pixels y), instead of isometric grid X and Y format. Usually you would just divide them by the tile size, but isometric needs some sort of transform. For example on a 64x32 isometric tilemap of size 40 tiles by 40 tiles an object at (20,21)'s coordinates come out as (640,584) So the question really is what formula gets (20,21) from (640,584)?

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