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• Elastic Collision Formula in Java

  - by Shijima

  I'm trying to write a Java formula based on this tutorial: 2-D elastic collisions without Trigonometry. I am in the section "Elastic Collisions in 2 Dimensions". In step 1, it mentions "Next, find the unit vector of n, which we will call un. This is done by dividing by the magnitude of n". My below code represents the normal vector of 2 objects (I'm using a simple array to represent the normal vector), but I am not really sure what the tutorial means by dividing the magnitude of n to get the un. int[] normal = new int[2]; normal[0] = ball2.x - ball1.x; normal[1] = ball2.y - ball1.y; Can anyone please explain what un is, and how I can calculate it with my array in Java?

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• What is a byte stream actually?

  - by user2720323

  Can anyone explain me what byte stream actually contains? Does it contain bytes (hex data) or binary data or english letters only? I am also confused about the term Raw Data. If someone asked me to "reverse the 4 byte data", then what should I assume the data is hex code or binary code? Can anyone please clarify this for me. I have read so many articles and in java and c. They used to talk these words frequently but never understood them clearly.

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• Space in img:s "ALT" attribute good/bad for search engines?

  - by Camran

  I am trying to make it easier for search engines to crawl my website, as it is almost 100% dynamic. I have a couple of transparent images which are actually links to sections of my page. I wonder, if I add an "alt" attribute containing space characters to explain the target, will this improve SE rankings etc? For example: <img src="blabla.png" alt="post new classified"> Or will this just result in errors? Ànd, what should I put in the alt attribute if I can't use space? PS: Another different and short question, will javascript-rich content make a page less important to crawlers? Thanks

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• Jquery/JavaScript's role in MVC (zend)

  - by user7543288

  I have my doubts if this question should have went into the programmers.stackexchange.com or not…but I would like to ask all you experienced developers out there, how do you see the connection that jquery - javascript has with the MVC. How would you explain it to a n00b? does it bridge the communication between the View and the Controller? or what? I have done my research and I believe this is the best article explaining it http://www.alistapart.com/articles/javascript-mvc/ but I would like to hear your point of view..

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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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• C# to develop Android app

  - by opt

  I am learning C# and I'm wondering if there is the potential to develop an Android app that satisfy the need that I'm going to explain. I would basically need an app that, when launched retrieves some data from a webpage (i.e. realtime stock prices), trim the xml to find the data i need and store this value into a variable. Then some calculation is performed on this data and the result is sent via email. It is already possible to launch an app automatically based on some conditions (e.g. every 5 minutes) by using the software Tasker. It is actually also possible to retrieve the data from a webpage and save to a Tasker variable or to a txt file somewhere in the phone (or Dropbox/Box...). But I would like to do that directly via an app so that everything is done "internally" once the app is launched. If that's possible, how should I proceed? Is there any good reference I can use to address my need?

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• Would I benefit changing from PHP to Node.js (in context)

  - by danneth

  The situation: We are about to roll out what is essentially a logging service. As we are rather PHP heavy, the current implementation use it. We will have about 200 computers (most on the same network) that will each send, via HTTP POST, around 5000 requests/day. With each request containing about 300 bytes of data. The receiving end is hosted at Amazon and is a very simple PHP form with some simple validation that puts everything in a database. Now, I've recently been introduced to Node.js and I'm curious as to if it would be a good fit for the backend here. Granted I could easily build something to test this. But since I haven't fully grasped the async-methology I would really like someone with experience to explain it to me.

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• Any good site that teaches C++?

  - by Shinmaru

  I am searching for any good site that teaches C++, that can explain most to all things about it(general) and has a decent active community. About Me: I am new to programming(knows nothing of it, so please bare with me), I have only learned(to a very basic form) LUA scripting Language, so yes I am your complete newbie. I got interested in programming, from scripting in LUA, so you can say it was my small stepping stone, One would basically take a course in college, but not everyone is well funded for that and I can't buy books for the same said reason(yes I'm somewhat poor, only money for essentials and bills), I'm not trying to get sympathy, just stating my conditions. and Please, something in between the lines of 'Programming for Dummies'(I'm not the brightest crayon in the box), I know this will not be easy, but your help will be most appreciated. I would learn for either Windows and/or Linux/Unix. I use both. Site(s) I know: Cplusplus.org(quite inactive and tutorials are a little for the programming savvy.

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• Creating a game engine in C++ and Python - Where do I start? [closed]

  - by Peter

  Yes, you read correctly, how does humble ole Peter here make an engine using the 2 languages he's proficient in to an extent. I have more than enough time and wish not to use any 3rd party "stuffs" (engine parts like methods, classes etc etc, fully from scratch). If anyone could PLEASE explain how this is done then i will love you forever. Thanks for reading, hoping for some productive answers. Thankyou very much. EDIT: Re read what i've said for the 4th time, forgot to mention; 2D sprite based, with voxels and physics. :D

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• I just updated to 12.04 from 11.10 and now the Unity bar is very sluggish and even the menus do not show on the panel

  - by jredkai

  Like the title says, I just upgraded to 12.04, I know it is only beta but I'm having problems with the Unity bar and the panel with the menus. First the Unity bar is acting very sluggish..I really don't know how to explain it. Also with the menu at the top, it keeps a strange little black bar on everything, even across my tabs in Firefox, it also doesn't let me see any of the menus, well they flicker and you sort of have to guess where everything is. I'm at a loss, I've already ran updates a couple of times to see if I missed something. I really hope I don't have to completely redo my whole Ubuntu setup. Any help would be greatly appreciated.

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• How to avoid problems when installing Ubuntu and Windows 7 in dual-boot?

  - by BlaXpirit

  I want to try out Ubuntu (and hopefully choose it as my primary OS). After looking at many versions of it in VirtualBox and from Live CD, I've finally decided to install it. So I defragmented and shrinked one of the partitions to make room for Ubuntu. My current setup (after shrinking the D: partition): [·100 MB·] [······250000 MB······] [·······600000 MB·······] [··100000 MB···] Reserved Windows 7 system (C:) Data (D:) Free space NTFS NTFS NTFS (for Ubuntu) The Internet (including AskUbuntu) is full of scary stories about Windows not loading after installation of Ubuntu, something about installing GRUB to a wrong partition, etc. As I am a newbie to Linux and Ubuntu, it is very easy for me to do something wrong. Please mention the problems that may appear and explain how to avoid them. Ubuntu version that will be installed: 10.10 Desktop amd64 Please note that I have installed Windows 7 about a year ago, so I have much to lose if something goes wrong. I want to be very careful because there is no way for me to backup all the data.

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• Creating ASP.NET 3.5 Admin Pages using a Query String in a Master Page

  This is the continuation of part one which ran on Tuesday of last week. After deleting the styles lt style type= text css gt in the head section of MasterPage.master you will need to create an external CSS to solve the relative URL problems in the website. This will ensure that the background images and links work according to the master page design. This article will explain how to do this and more.... Comcast? Business Class - Official Site Learn About Comcast Small Business Services. Best in Phone, TV & Internet.

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• Software Design and documentation – what do people use that has proved valuable?

  - by eddyparkinson

  When creating software, what do you use to design, document and visualize. Looking for evidence/examples. e.g. Use cases, Pseudo code, Gantt chats, PERT charts, DFD, decision trees, decision tables (Answers maybe used to help teach students) What do you use to help with creating software. Also why; when has it proved valuable? --- Edit -- Proved valuable: The pattern so far suggests that the style of UML tool used is linked to an objective. e.g. "get it straight in MY head", explain to business mangers, quality control.

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• How does the HUD prioritize commands?

  - by user50849

  Every now and then I want to reach the "Edit Preferences" menu item in Firefox, and the HUD makes this very convenient. ALT + "Edi" will suggest exactly that to me. Something that I find annoying however is that if I complete the work "Edit" instead, the HUD will switch to suggest "Network Edit preferences" instead. While this is a perfectly valid match as well, it seems like an inconsistent behaviour to me. Could someone explain in more detail how the matching works, so that I can make better use of the HUD?

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• Learning MySQL Query optimization

  - by recluze

  I've been doing web/desktop/server development for a while and have worked with many databases (mysql mostly). I've come to the point in my career when I need to have someone look at my queries because they're 'kind of slow'. I believe it's now time to start learning query optimization. While I know the basics of index and joins etc., I'm not familiar with how to use, say, the EXPLAIN output to improve performance of my queries. I have not been able to find any online material that starts with the basics and takes me to application. Getting a book is not an option right now so I'm looking for tips about how to proceed with this. I hope this question is general enough not to get closed.

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• Sudden Breakthroughs (Miracles at work)

  - by MobileDev123

  Lot of things has been discussed that can be taken as negative things about programmers work. Lets discuss about something good and unexpected things that happen to programmers. Example: (After R&D of two days and a lot of disappointments) You just spend an hour with your PM to explain that some feature due to some problem you are unable to release this module in today's beta... after a lot of arguments you are given an hour to make your app work without this module. You sit on your workstation to make a release and all of a sudden you find what turns out to be a silly little problem.... (you solve it and prepare a desired build) did you face miracle (= sudden, positive surprises?) in your life?? what was your reaction in case you have come through such experience?? (N.B. I know my English is not that good and that's why I'm open to every linguistic mistakes needed to be corrected)

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• Dual boot (Win 7 & Ubuntu 13.10 clock problem

  - by peter

  I'm a "newbie" to Ubuntu, but I've been wrestling with this problem for several hours and don't seem to be able to solve it: When I set the time in Windows (Indianapolis, Eastern U.S. time zone) and then re-boot to Ubuntu, the computer time goes to Hawaiian time. When the time is set in Ubuntu, and the computer is rebooted to Windows the time is advanced by 5 hours. I've set the time in the BIOS, and it seems to make no difference. I've tried setting the time from "automatic" to "manual", all with the same result. Not a big problem, but it shows some underlying glitch. Could anyone explain?

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• SEO Tips - Updating Your Content and Avoiding Duplicate Filters

  If you are just getting into Search Engine Optimization, it's important that you are aware that content is the most important thing in your website in order to get high ratings. If you decide to hire an SEO Consultant, make sure that you explain to them exactly what you want your website to look like and the content that you would like it to feature. Having fresh and relevant content in your website is the key as that will bring web crawlers back frequently. There are different ways of achieving this while avoiding getting your website removed off of a search engine due to duplicate content.

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• How do you get users to rank their software enhancement needs?

  - by Lego Stormtroopr

  I've inherited a legacy software system, and have been tasked with performing usability and system upgrades. While there's nothing bad with the system, from discussions with the users, there are "small" usabilty issues that need to be addressed. At this stage I'm the lone developer on this system, and apart from testing I don't use the system at all, so its difficult for me to know what issues may exist or are percieved to exist. I'm going to have some time to speak with them all and discuss what they percieve to be good/bad or indifferent about the system. Since its essentially just me for the time being my time is limit. So I was considering asking them to imagine that I'd only be able to do one change, have them all write privately what they'd want that one change to be, and then helping them rank those, but I'm hoping for other tips as well. What techniques exist for getting users to explain their wants, needs, and requirements, while also having them rank them by importance or desirability?

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• Application of LGPL license on a simple algorithm

  - by georgesl

  The "scope" of the GNU license is troubling me : I know it has been answered many times ( here, here, ... ) but shouldn't we take into consideration the complexity and originality of a code before using GPL license ? I explain : I'm working on a pet project using the DTW algorithm that I have written in C using the pseudo-code given on the wikipedia page . At one point I decided to change it for a C++ implementation ( just for hone my c++ skill ) . After doing so, I've looked for an existing implementation on the web, to compare the "cleanliness" of it, and I found this one : Vectored DTW implementation, which is part of limproved, a C++ library licensed under GPL v3 . Personnally, I don't mind the GNU license because it is a personnal project, which will never led to any kind of commercial purpose, but I wonder if this implementation can abide a company using it to open their code ( and other FOSS permissions ). Theoretically, I think it can ( I may be wrong :p ), but the algorithm in question is so simple (and old) that it should not.

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• How do you diagnose constant crashing issues?

  - by P102

  My recent installation 10.10 on my laptop keeps freezing/crashing on start-up after working perfectly for one day. The system just freezes, like a screnshot, and a restart is required. It happens directly after login or just as any application is selected. Nothing new has been installed. I have just moved from XP so I would be very grateful if some one could please explain to me, as simply as possible, how to do the following... How to diagnose the problem so it can be fixed, remember it may have to be before the log in. all help is greatly appreciated.

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• How to run PHP in Webmatrix (updated) ?

  - by Anirudha

  I have write How to run PHP in Webmatrix ? few months ago. In this post I will try to explain it little bit better. When you create a website in webmatrix then try to go to  site > settings > here you can find the option for enble the PHP for your website on IIS express. You can also install the PHP through WPI (web platform installer). The PHP you have installed will be going into C:\Program Files (x86)\IIS Express\PHP/$ $ = version of PHP you have installed. Try http://forums.iis.net/1166.aspx for any help regarding installing PHP in webmatrix. you can post your idea also to webmatrix.uservoice.com

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• is it allowed to create a app with overscroll feature?

  - by user61664

  As Apple wo lawsuits against Motorola and Samsung with the so called overscroll patent, i am asking myself what the legal consequences of releasing a APP with such a feature are. I think if one releases the APP in IOS it would be okay, but what happens in android or Windows? Am i getting sued ? What happens if i am writing an APP for the Browser? Isn`t this overscroll patent a design patent? It this is true, all apps hat usw overscrolling and not written by apple , would be illegal. Very confusing. Can anyone explain is?

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• .htaccess redirect question

  - by user473056

  Hi, I'm trying to set up my .htaccess file to take the displayed link and route it to the destination link as below Displayed Link http://www.my-website.com/click-4559226-10388358?url=https%3A%2F%2Fdestination-website2.com%2FItem.php%3Fid%3D44350396%26sld%3DA6D7A632-821E-4b78-ACD0-147658B77BD6 Destination Link http://www.destination-website.com/click-4559226-10388358?url=https%3A%2F%2Fdestination-website2.com%2FItem.php%3Fid%3D44350396%26sld%3DA6D7A632-821E-4b78-ACD0-147658B77BD6 Effectively, all that changes is the first url (http://www.my-website.com) everything after that is the same. Is this possible and could someone briefly explain how I would go about it? * Just to be clear, I dont want to redirect everything from my-webiste.com. Just links that start http://www.my-website.com/click-4559226-10388358

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• Model Based Apps and Frameworks

  Having been involved (mostly as a user or observer) with several recent applications and frameworks, Ive come to the conclusion that building your app/framework on an internal model is generally the best way to go.  In this post Ill explain what I mean by on an internal model and later describe the benefits I have seen, realized, been told about by others and still others that Ive only imagined (but are still possible).  I plan on writing a few blog posts along these lines to explore what...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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