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• How can I derive force vectors from velocity vectors?

  - by PixelRouter

  I'm making a 2d shooter ala Geometry Wars. I've got my own simple physics at work driving the background grid and all my entities. To move anything in the world I apply a Vector2d force to it. The 'engine' calculates the resulting acceleration and therefore the velocity. I am trying to port some code I found which implements the classic 'Boids' flocking algorithm, but the code I have works by calculating the Boids' velocities directly, so If i use it as is, it bypasses my physics engine. How I can translate the velocity vectors into force vectors that I can apply to the Boids and which will result in the proper velocities via my physics engine.

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• Why do so many people dislike C++?

  - by General K

  Beginners and professional, on blogs, in forums and chatrooms - people say it everywhere: C++ oh dear god no The short form of the question: For what reason is C++ so widely disliked and people are horrified by the imagination of using it for some project? I have been using a lot of different languages, including C++ by now, and I can only say that I really like it. I'm far more horrified by Delphi than by C++. Actually, I find it's an almost perfect, compiled language! I've been doing a lot of different projects in C++ as well, ranging from 3D video games to webservers and emulators for old video game consoles. And I still do not see the problem everyone else seems to have with it! It was hard for me to get into it of course, as it is quite complex and has a lot of depth, but after that it's simply great.

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• Microsft Targets Graymail and New Patch Tuesday

  The first critical bulletin will patch a vulnerability contained within Windows and Internet Explorer. Microsoft said that if the vulnerability was exploited, it would give hackers an avenue to spread malicious code on a remote basis. The bug affects the Windows XP, Windows Vista, and Windows 7 operating systems, plus Internet Explorer versions 6, 7, and 8. The Windows Server 2003 and 2008 platforms have been identified to be affected by the bug as well. The second critical bulletin addresses a .NET and Silverlight bug that makes remote code execution possible. With the vulnerability in pl...

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• What is the best and cheapest CMS for an E-Commerce site?

  - by kf0l

  My client needs a site customers can use to pay the membership fees and join. It should also track when old members need to pay again. There are some members that will not want to pay online and they want to be able to use the site to manage all payments. The CMS must be cheap to host online, potentially with something like GitHub/Heroku. I am experienced with PHP and RoR. I am using a CMS so once I am done with this project it is easy for them to update. After reading through different posts I think WordPress with an e-commerce Plugin may be the right solution. Spree and WebGUI also looks promising. Thanks for the help.

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• Ubuntu One lost most of my files!

  - by Max

  I keep in my UbuntuOne the source code of my projects as a back up. In the past it worked and I never had problem. It happened that I had to change the hard disk of my laptop and I installed a fresh Ubuntu 12.10 in the new one. First time I connected with UbuntuOne it downloaded my files, but when I went to see my projects almost all my c++ source code files were missing!!!... I tried to check if I still have them on UbuntuOne by accessing from the web but nothing... my work is lost forever. I don't know who to ask for help? Is there a way to get back my precious files? Honestly I can't trust this service any more, I'm very disappointed. (edit: thanks God I found a back up in one of my external hard disks. I won't trust Ubuntu One any more, it's buggy and quite slow. )

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• iOS App Store Under 18 - Post via private limited company? [closed]

  - by jskidd3

  I'm 17 years old and wish to post an application on the iOS App Store. My situation is a little different to other users doing the same thing, though. I'm finding this very frustrating. It's very annoying that Apple don't let younger talent post themselves. Is it true that if I do post under my Father's name I can choose a different name to be listed on the app store? I want to keep this professional, I don't want my father's name to appear underneath the application on the store. :P I have registered myself as the company director of a private limited company. Even though I'm the only one in the company, is this a way to bypass the 18+ restriction or do I need a minimum of 2 employees? Why the hell has this been closed? Thanks

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• Moving a LAMP set up from 32 bit to 64 bit

  - by user10157

  Hello everyone... I have setup an Ubuntu server 10.10 32bit on an old Dell D610 Laptop for testing. I have the latest PHP, MySQL and Apache with Wordpress installed. After the testing is over and once I finish adding material to my wordpress I will build a Ubuntu 10.10 64bit VM on Hyper-V. What I am wondering is , if it's best practice to build everything from scratch (which will take me more time and would like to avoid) or transfer the database and all other settings? If I choose to transfer how and what I need to do? Here's where I'd like some help as I am still an intermediate admin (If I can call it that!) I am looking forward for your help. Thanks!

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• What exactly is a chroot? Is it similar to a simultaneous dual boot?

  - by mathematician1975

  It has been suggested to me that the use of a chroot might solve my problem of building an application that must run on an embedded device. I have inferred from this description that it is somehow similar to creating the embedded environment locally on my machine which I can then use to develop on from my desktop development machine. Is this the right way to look at the functionality or have I totally misunderstood? In order to get some idea of how it works I read this https://wiki.ubuntu.com/DebootstrapChroot which I will attempt to make a chroot for an old Ubuntu version on my machine. However, as I am a total linux novice, I am a bit concerned that as I do not entirely know what I am doing is there anyway that I could end up with an unusable system?? Is this something that a novice should even attempt???

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• How can I improve these online java programming puzzles I wrote for my (middle/high school) students?

  - by Arcymag

  I'm teaching some middle and high school students programming right now, and I found that some of them really liked online programming puzzles. So I created http://www.kapparate.com/coder/ , and right now there's 4 categories of puzzles. All the puzzles are set up right now so that variables are pre-initialized, and the user plugs in some code in the middle. For example, the problem might say these are pre-initialized: int x = ????; int y = ????; int z; and then the program might ask the student to write the final line of code: z = x + y;. Now I know I could go a long way in improving the usability of this site (like having an area that lists the pre-defined variables), but I was wondering if this concept seems sound. I know some sites have kids fill in functions, but not all of my students know what functions are yet, and I'm trying to introduce online programming puzzles before that.

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• WPF and user Interactivity Part IV: Attached property for moving and resizing shapes

  In this article, I will refactor the previous code by representing it as an attached property.

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• A drop in SERP after following webmaster guidelines [on hold]

  - by digiwig

  So here's a puzzle for all you SEO gurus out there. I recently launched my own site. I had target keywords which were ranking very well for about 1 month, within the top five and even appearing in first place. In an attempt to maintain good positioning, I followed guidelines by adding robots.txt, an xml sitemap redirecting non-www to www redirecting index.php to root domain adding htaccess 301 redirect for old pages I added rich snippets created a google+ account, verified my picture to appear, I went through each of the webmaster issues with duplicate titles and meta descriptions and improved header tag document outlines i even created a few more blog posts to keep the content freshing and moving. So now my website appears on page 2 with my target keywords - and all because I followed the guidelines. What is happening? I see competitors with stagnant content superglued to position 1.

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• How can I add a custom item to the Sound Indicator?

  - by con-f-use

  One of the strength of Unity are the various standardized indicators. I want to customize the sound indicator with an additional menu entry that runs a small shell script. I'm not afraid of a little Python code and I hope someone can point me to the right subroutine in the right file. I suspect that will be fairly easy but all the indicators are just so bloated that I can't look through their code in a reasonable time. Any help is appreciated. I know it is possible as the marvelous Skype-Wrapper does it.

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• JET now available on OTN

  - by mramcha

  I know some of you have been waiting patiently, so I'm pleased to announce that the JET bundle is now available for download on the Oracle Technology Network. I've migrated most of the content from the old Sun wiki site, and got the download in a single handy location on OTN. Download JET now.  The version available is the current latest, which is 4.9.4. This version contains a number of updates, the most significant of which is the ability to specify slot locations instead of the traditional cXtYdZsN nomenclature. This is pretty useful when trying to Jumpstart multiple servers with SAS2.0 based HBAs, as they will have the WWN embedded in the cXtYdZsN name, and it's pretty difficult to guess what that will be until you've booted the server. The JetSDS and JetZFS modules have also been updated to use the slot terminology. Happy JETing,

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• Good places for starting to learn Lua scripting [closed]

  - by Cascalho

  I want to start learning to script in lua for game development. I could start with the official Lua tutorials, but I would rather study scripts that were written specifically for games and learn the syntax from there as I believe this is faster and more related to what I want. Can you recommend tutorials in video or text that are very detailed in explaining the code? Or some open source game with heavily commented code? What I want is something detailed that walks me through it, so I start understanding both the syntax and how each piece relate to each other, like "First of all, install this, this and that." "So, here we are defining a new function that will make the player jump." "This is the main script that calls the other ones. It defines these variables." "This function tests if the player is alive."

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• How would I migrate a front page form based site to an IIS7 server? [on hold]

  - by Nick Gilpin

  I have an large html website on a very old server and I'm attempting to move it to a brand new server running IIS7. I've tried moving the entire site to the WWW directory, but then all my forms return "The HTTP verb POST used to access path is not allowed". Additionally, all the solutions I've found online only work on a page by page basis. Is there a simpler/faster way to migrate a large website containing many forms to IIS7? Here is the specific error message: The HTTP verb POST used to access path '/FormServer/Mig/_vti_bin/shtml.dll/admissions/askseaaggie.htm' is not allowed.

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• TSQL Challenge 82 - Find elements that uniquely make up a group

  The challenge is to find the Tax Code based on Price. Each sales amount is uniquely made up by the sum of one or more prices. Based on this you should assign the tax code to each price. Keep your database and application development in syncSQL Connect is a Visual Studio add-in that brings your databases into your solution. It then makes it easy to keep your database in sync, and commit to your existing source control system. Find out more.

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• Why can't I update to 11.04?

  - by user285982

  I am using Ubuntu 10.10 64 bit, and I can browse the internet fine. I am typing this using the machine. When I attempt to use the Ubuntu Update Manager to update to 11.04, I get this error message: Failed to Fetch Fetching the upgrade failed.There may be a network problem. And when I try to change servers, here is what I get: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found [IP: 91.189.91.15 80] It repeats with other lines, 404 not found. Some index files failed to download, they have been ignored, or old ones used instead. Any ideas?

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• Inversion of control in Unity?

  - by user3206275

  I am semi-experienced .NET developer who has just began working with Unity. I am trying to decide on how to make IoC work in Unity 4.X ( I have not yet tested anything), and I wonder what are the good ways of achieving it. This post and its answers states that Ninject won't work with Unity, however it is old. Is it still true? If yes, what are other means of achieving IoC in Unity ? Edit 1 : I am targeting mainly Windows platform. So I don't need platform interoperability, I just need it to work.

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• Le projet PHP migre sur Git, les tags des futures release seront signés par l'équipe de développement elle-même

  Le système de gestion de version Git vient de recevoir un nouveau "membre" : il s'agit du projet PHP qui vient de migrer complètement son code source sur cette plate-forme comme on peut le lire sur leur site web . Il est donc désormais possible de cloner ou de "forker" les sources de PHP depuis son miroir GitHub. De même les requêtes Pull faites via GitHub sont désormais prises en charge. Le code source est également disponible via le lien suivant et toutes les instructions relatives au clonage de l'arbre des sources de PHP peuvent être consultées sur le lien suivant .

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• lower graphics setting in ubuntu

  - by zkent

  First off, I am new to Ubuntu. I come from a Windows background (DOS before that) and am loving it so far. I installed it on an older Dell laptop that I wanted to get another year out of. I set this machine up primarily as a LAMP development machine for a project I am working on. The machine is a Vostro 1500 and it has 4GB RAM (maxed) and an upgraded hard drive. I can't watch YouTube videos for long before it starts to overheat and start acting sporadic. I can live without YouTube but every so often the application switching (alt-tab) gets slower and begins not showing all applications and the Dash home quits displaying properly. I am sure I am asking a lot of this old machine. What I really want to know is: are there any settings in Ubuntu that allow me to lower the graphic effects (fade-ins, transparencies, fancy transitions, etc) that would be less taxing on the video card?

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• Can I use Unity with XMonad?

  - by geniass

  I've been using Fedora for a while, but I recently decided to upgrade my ubuntu installation from 12.04 to 12.10. While I was using Fedora, I found xmonad tiling window manager which I sort of got working with xfce. I really like xmonad and I now automatically use the keyboard shortcuts without even thinking. So I would like to use xmonad with unity. Now, I have seen several blog posts etc. that explain how to setup the whole thing in 12.04, with Unity2D. But now, Unity2D has been removed, and the old methods no longer apply. I have read that Unity is actually just a Compiz plugin, and that the wm can't be replaced. Does no version of Unity have a replaceable WM? I've also tried MATE (GNOME2 fork) with xmonad on 12.10 and that is totally broken for me, but that's for another question.

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• Checking the File is write Protected (Read only) – VC++ MFC

  While writing some contents into a file through code, you need to check whether the file is already exist and is read only.

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• How will you make a webdeveloper resume in 2012? [closed]

  - by Napolux

  It's been a while since the last time I updated my resume. Now it's time to give it a refresh, but even if I have a strong experience and I worked recently on many big projects my resume "feels" quite old. Maybe is the format (in Europe we have europass that is a standard) that doesn't fit the work of a developer, I don't know. Or maybe it's only me: it's 2012 and I start thinking that showing a list of projects and a bunch of acronyms in a CV like PHP, HTML, JS, CSS, whatever is quite boring for a recruiter. How is your resume? What is in your opinion the best format (a little website, a PDF showcase of the projects I worked on, just a standard CV, etc...) for a webdeveloper?

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• Multiple network installs with cached downloads

  - by popey

  I tend to do lots of Ubuntu installs, and I'd like them to be up to date from the moment I do them, and not have to install a bazillion updates as soon as the install finishes. I'd also like to cache those packages somewhere on a machine on my LAN, so I don't re-download all the packages every time. How easy is this to achieve? Is there a guide somewhere to making this happen? Bonus points if I don't have to burn any CDs or use USB sticks! Edit: I have noticed a lot of guides for PXE booting and would be tempted to set this up but every time I find one they seem to be old/outdated and broken. My home server runs 10.04 LTS.

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• Clean Ubuntu 14.04 install taking longer to boot after kernel upgrade

  - by mvburgos

  Hello this is my first post. I own an Asus Chromebox (2gb ram, 16 gb sdd, 3.0 usb ports) and fresh installed Ubuntu 14.04 x64. I decided to upgrade kernel because I was experiencing some freezing issues with XBMC, So first i installed stable kernel 3.14.04 from mainline and boot time was fine (it booted very fast I would say about 5 seconds) then after a while I installed kernels 3.15 and 3.14.06 BUT this time I also removed OLD STOCK KERNELS (dunno if that has something to do) after that the problem began, boot time is taking way longer, I would say about 30 seconds. Finally today I installed kernel 3.14.07, set grub to boot with that by default but same thing :( I post boot.log and dmesg, hope it is correct for this matter, if you need any other log just let me know. boot.log dmesg

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