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• How can I factor momentum into my space sim?

  - by Josh Petite

  I am trying my hand at creating a simple 2d physics engine right now, and I'm running into some problems figuring out how to incorporate momentum into movement of a spaceship. If I am moving in a given direction at a certain velocity, I am able to currently update the position of my ship easily (Position += Direction * Velocity). However, if the ship rotates at all, and I recalculate the direction (based on the new angle the ship is facing), and accelerate in that direction, how can I take momentum into account to alter the "line" that the ship travels? Currently the ship changes direction instantaneously and continues at its current velocity in that new direction when I press the thrust button. I want it to be a more gradual turning motion so as to give the impression that the ship itself has some mass. If there is already a nice post on this topic I apologize, but nothing came up in my searches. Let me know if any more information is needed, but I'm hoping someone can easily tell me how I can throw mass * velocity into my game loop update.

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• Multilevel Queue Scheduling (MQS) with Round Robin

  - by stackuser

  I'm trying to use MQS to create a Gantt chart of 5 processes (P1-P5) as well as their waiting, response, and turnaround times (and averages of those metrics) within a CPU task schedule. Here's the basic table of arrival times and bursts: Here's my actual work version after ticking off the finished processes. The time quantum for each time slice is (2 queues) TQ1=4 and TQ2=3. Note that I'm doing MQS and NOT MLFQ: It just doesn't feel like I'm doing MQS right here, I know this gets a little complex but maybe someone can point out where I'm going totally wrong.

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• Why write clean, refactored code?

  - by Shamal Karunarathne

  Hi programming lovers, This is a question I've been asking myself for a long time. Thought of throwing out it to you. From my experience of working on several Java based projects, I've seen tons of codes which we call 'dirty'. The unconventional class/method/field naming, wrong way of handling of exceptions, unnecessarily heavy loops and recursion etc. But the code gives the intended results. Though I hate to see dirty code, it's time taking to clean them up and eventually comes the question of "is it worth? it's giving the desired results so what's the point of cleaning?" In team projects, should there be someone specifically to refactor and check for clean code? Or are there situations where the 'dirty' codes fail to give intended results or make the customers unhappy? Do feel free to comment and reply. And tell me if I'm missing something here. Thanks.

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• How to prevent WLAN connection from dropping permanently on a Fritz USB WLAN N stick?

  - by Chris

  I have a desktop with a Fritz USB WLAN N stick and tried Ubuntu 12.04. Installation went fine and WLAN is working. However, connection drops permanent. Reconnecting manually fixes it but after a few minutes it drops again. It's connected to a Vodafone 802 box with WLAN N fix set. It seems that it works when I switch off N mode. But I need to test. Can someone confirm this issue or is there another solution? I have another machine with 12.04 (HP 625 laptop) running where connection is stable.

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• I don't understand why algorithms are so special

  - by Jessica

  I'm a student of computer science trying to soak up as much information on the topic as I can during my free time. I keep returning to algorithms time and again in various formats (online course, book, web tutorial), but the concept fails to sustain my attention. I just don't understand: why are algorithms so special? I can tell you why fractals are awesome, why the golden ratio is awesome, why origami is awesome and scientific applications of all the above. Heck I even love Newton's laws and conical sections. But when it comes to algorithms, I'm just not astounded. They are not insightful in new ways about human cognition at all. I was expecting algorithms to be shattering preconceptions and mind-altering but time and time again they fail miserably. What am I doing wrong in my approach? Can someone tell me why algorithms are so awesome?

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• Ubuntu Server 12.10 No GUI Headless Boot and/or Reboot

  - by Ubuntu User

  I have a headless server running the latest Ubuntu Server 12.10. It does not have any GUI at all. I am having the same issue that others are having which is that when you boot or reboot without a monitor (headless) the computer does not boot. The solution presented to others was to edit their xorg.conf file. But since I do not want a GUI installed (and therefore chose not to install a GUI after installing Ubuntu 12.10) I do not have a xorg.conf file in the /etc/X11/ directory. Ubuntu is a widely used distro of Linux, especially for server applications, I absolutely love it. Therefore, there has to be someone who solved this already?

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• REST - Tradeoffs between content negotiation via Accept header versus extensions

  - by Brandon Linton

  I'm working through designing a RESTful API. We know we want to return JSON and XML for any given resource. I had been thinking we would do something like this: GET /api/something?param1=value1 Accept: application/xml (or application/json) However, someone tossed out using extensions for this, like so: GET /api/something.xml?parm1=value1 (or /api/something.json?param1=value1) What are the tradeoffs with these approaches? Is it best to rely on the accept header when an extension isn't specified, but honor extensions when specified? Is there a drawback to that approach?

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• Adding Bzr Launchpad PPA to Ubuntu Hardy

  - by Robery Stackhouse

  I've got TortoiseBazaar installed on my Windows laptop, and I was trying to branch a repository hosted on my VPS to another directory on my VPS, and I got this lovely error: bzr: ERROR: Unknown branch format: 'Bazaar Branch Format 7 (needs bzr 1.6) That lead me to this mailing-list archive: http://osdir.com/ml/bazaar/2009-06/msg00692.html Then I tried following the instructions here to add the Launchpad PPA to /etc/apt/sources.list, but they forgot to mention that you need to do this: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com D702BF6B8C6C1EFD Which I found out about here after I got this error: GPG error: http://ppa.launchpad.net hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D702BF6B8C6C1EFD after modifying my /etc/apt/sources.list and running: sudo apt-get update Just thought I'd save someone else some pain. And of course, don't forget to uninstall the version of bzr that wouldn't play ball in the first place.

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• What label of tests are BizUnit tests?

  - by charlie.mott

  BizUnit is defined as a "Framework for Automated Testing of Distributed Systems.  However, I've never seen a catchy label to describe what sort of tests we create using this framework. They are not really “Unit Tests” that's for sure. "Integration Tests" might be a good definition, but I want a label that clearly separates it from the manual "System Integration Testing" phase of a project where real instances of the integrated systems are used. Among some colleagues, we brainstormed some suggestions: Automated Integration Tests Stubbed Integration Tests Sandbox Integration Tests Localised Integration Tests All give a good view of the sorts of tests that are being done. I think "Stubbed Integration Tests" is most catchy and descriptive. So I will use that until someone comes up with a better idea.

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• WWDC 2012 announced features on iOS 5?

  - by Arnold Sakhnov

  I am relatively new to iOS development, so after watching a bunch of WWDC videos announcing new awesome features for the iPhone SDK, I still got a few questions regarding their support for older devices. Specifically: Do the new compiler features (such as literals support, auto-synthesize, etc) require iOS 6 on the target device, or can the new style code be deployed to iOS 5 devices? Auto-layout for iOS, same question. Will it only be supported on iOS 6, or 5 as well? If it's 6 only, what kind of fallback are we expected to implement? Would really appreciate if someone could clarify this for me, as I'm thinking about rewriting my older unfinished project and I would love to use some of that improved SDK functionality.

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• Is there a good book to grok C++?

  - by Paperflyer

  This question got me thinking. I would say I am a pretty experienced C++ programmer. I use it a lot at work, I had some courses on it at the university, I can understand most C++ code I find out there without problems. Other languages you can pretty much learn by using them. But every time I use a new C++ library or check out some new C++ code by someone I did not know before, I discover a new set of idioms C++ has to offer. Basically, this has lead me to believe that there is a lot of stuff in C++ that might be worth knowing but that is not easily discoverable. So, is there a good book for a somewhat experienced C++ programmer to step up the game? You know, to kind of 'get' that language the way you can 'get' Ruby or Objective-C, where everything just suddenly makes sense and you start instinctively knowing 'that C++ way of thing'?

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• How can I mount a Synology DS212?

  - by Vigo

  I Have installed Ubuntu 11.10 and want to mount a synology ds212. I can see the diskstation in de filebrowser (before mounting with nfs) but can not open it. I've tried to mount it with nfs but no succes. Everything should be right at the Synology (nfs is on and maps are selected), and I've added a line in fstab. If I type sudo mount -a I dont't get an error. If I go to the mounted map I can't see anything in it..... What is going wrong? maybe router? Hope someone can help..!

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• suspend resume not working on HP dv7

  - by Emiel

  this one is driving me nuts. My HP dv7 laptop isn't resuming from suspend and hybernate. On suspend - resume it leaves me with a black screen. On hibernate it succesfully loads the images and then it hangs.... I searched through internet and tried serveral things, but nothing seems to work for this HP dv7 on Ubuntu 12.04. With 11.10 it didn't work either. Intel® Core™ i5 CPU M 450 @ 2.40GHz × 4 VESA: Intel®Ironlake Mobile Graphics 64-bit Hope someone knows where to start the search.. I'm really desperate.

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• How to explain OOP concepts to a non technical person?

  - by John

  I often try to avoid telling people I'm a programmer because most of the time I end up explaining to them what that really means. When I tell them I'm programming in Java they often ask general questions about the language and how it differs from x and y. I'm also not good at explaining things because 1) I don't have that much experience in the field and 2) I really hate explaining things to non-technical people. They say that you truly understand things once you explain them to someone else, in this case how would you explain OOP terminology and concepts to a non technical person?

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• How can I create a facebook style message system in Rails 3?

  - by Angela

  I am trying to create a basic message system that allows users to send messages to each other and display it in a simple "Inbox" that shows both messages received and sent, as well as the status of read or unread. Ideally I could reuse existing code. But if not, can someone provide a framework to help me do it? I started to use a single Message record that has UserMessage - one for the sender, one for the receiver. That way I could have separate status. But I'm not sure I'm quite doing it right and would like some guidance. Thanks.

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• Photo gallery for Blogspot blog

  - by Django Reinhardt

  I don't think this is entirely possible, but here we go: I have a friend who has a Blogspot blog. He has posts with text, posts with videos and posts with photos... and he was wondering if there's any way to turn the posts which are just photos into a thumbnail gallery screen on his blog. So for example, let's say he has 20 photo posts on his blog with the label Skiing Holiday 2009 (horrible example, I know). Is there a way of having a post created for his blog that displays those photos as thumbnails, linking through to their full size versions? I just don't think it's possible, but I'm really hoping someone will be able to offer a solution (or even a place where I could find a solution). Thanks a lot.

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• Are there any examples of a temporal field/object updater?

  - by Bryan Agee

  The system in question has numerous examples of temporal objects and fields--ones which are a certain variable at a certain point in time. An example of this would be someone's rate of pay--there are different answers depending on when you ask and what the constraints might be; eg, can there ever be more than one of a certain temporal object concurrently, etc. Ideally, there would be an object that handles those constraints when a new state/stateful object is introduced; when a new value is set, it would prevent creating negative ranges and overlaps. Martin Fowler has written some great material on this (such as this description of Temporal Objects) , but what I've found of it tends to be entirely theoretic, with no concrete implementations. PHP is the target language, but examples in any language would be most helpful.

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• Are too many assertions code smell?

  - by Florents

  I've really fallen in love with unit testing and TDD - I am test infected. However, unit testing is used for public methods. Sometimes though I do have to test some assumptions-assertions in private methods too, because some of them are "dangerous" and refactoring can't help further. (I know, testing frameworks allo testing private methods). So, It became a habit of mine that (almost always) the first and the last line of a private method are both assertions. I guess this couldn't be bad (right ??). However, I've noticed that I also tend to use assertions in public methods too (as in the private) just "to be sure". Could this be "testing duplication" since the public method assumpotions are tested from the unit testng framework? Could someone think of too many assertions as a code smell?

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• Is there value in having technical authors in a software team?

  - by Desolate Planet

  During my 5 years in IT as a software developer, I've noticed that developers have a strong distaste towards doing any documentation. The act of taking screenshots and creating documentation seems to be a painful and time consuming experience. In one company I worked for, we had a technical documentation team with two technical authors and they developed all the user guides for our customers. In other companies where I've suggested hiring a technical author, I've been told they are not worth the money, but I'm a little unsure if that rings true. Is it better to have developers stop coding and take half a day to do screenshots and create the various guides or is it worth hiring someone who handles such tasks?

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• Extracting GPS Data from JPG files

  - by Peter W. DeBetta

  I have been very remiss in posting lately. Unfortunately, much of what I do now involves client work that I cannot post. Fortunately, someone asked me how he could get a formatted list (e.g. tab-delimited) of files with GPS data from those files. He also added the constraint that this could not be a new piece of software (company security) and had to be scriptable. I did some searching around, and found some techniques for extracting GPS data, but was unable to find a complete solution. So, I did...(read more)

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• How do I fix "malformed line" errors in sources.list?

  - by david

  I had problems with my movie player. The sound was fine but the picture seemed to hesitate or stick or pause every few seconds so I was looking for some help on how to do this. I tried to install a command in the terminal and got this message: E:Malformed line 68 in source list /etc/apt/sources.list (dist parse) Can someone tell me how to fix this problem. I cannot open the software center or the update manager. The only other option I can think of is to wipe everything out and do a clean install. Thank you.

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• Anyone heard of 'tank tracking'?

  - by Heather Walters

  Someone I know told me about some seriously cutting edge blackhat SEO that he called 'tank tracking'. He said that it is some sort of code (he believes written in Python) that 'sits' around the outside perimeter of your visible webpage and listens for an incoming search spider. when a spider enters the page, it traps it in this weird wormhole, making it loop through, I don't know, certain keywords or something.... the result is that a SE like google would consequently give the page a full 100 rating (this person told me Google bestows some sort of scoring app once you've passed a certain number of their exams). A quick google search on 'tank tracking seo', 'tank tracking blackhat seo' and 'tank tracking google' yielded zero results. Let me backtrack a bit and say that I am not interested in utilizing blackhat techniques. I'm just astonished that something like this might be out in the world. Anyone heard of this?

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• Online medical image processing grand challenges

  - by taltos

  Hello! I moved my question from stackoverflow here. I cherish the hope that I will be luckier. I'm currently working on my thesis, and I'm looking for an/some online medical image processing grand challenge(s). I already know this site but I need a challenge which has microscopic image dataset like cells, chromosomes, bacterias, viruses etc with classification or recognation objective. Like karyotyping. Maybe someone is working on this field or his university made a challenge what I'm looking for, and can help me. Thank you!

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• How to create a KDE start application menu launcher that launches the search and launch desktop?

  - by davorao

  Now i love the plasma-netbook aka the "search and launch" interface but i would want to be able to have it appear on demand and not sit as the desktop default in the back of my windows. So what i imagine is having a application launcher be created which on activation brings up the "search and launch" feature allowing for easy access of your favorites or have that slick interface to find what your looking for. I'm aware that krunner solves a similar use-case but search and launch would be more of an Unity Dash type of search, whereas krunner is more useful when u exactly know what your looking for. And to summarize my question, since I'm clueless as to how this would be done, I'm lookinf for someone who could tell me how hard it would be to do it.

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• Are these interview questions too complex for entry-level C++ positions?

  - by Banana

  Hi All, I recently had a few interviews for programming jobs within the financial industry. I am looking for entry-level positions as I specify in the cover letter. However I am usually asked questions such as: - all two-letters commands you know in unix - representation of float/double numbers (ieee standard) - segmentation fault memory dump, and related issues - all functions you know to convert string to integer (not just atoi) - how to avoid virtual tables - etc.. Is that the custom? Because I don't think this kind of questions make sense for someone willing to get an entry-level job. Is it totally crazy to think that they should ask more conceptual questions? This is beginning to driving me nuts, honestly. Thanks

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