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  • Set Position of multiple bodies

    - by philipp
    I have a character composed of five bodies which are tied together by a lot of joints. On of them is the overall chassis, to which all forces and impulses are applied to move the whole Character. All in all that works very fine, except one thing: I need to set the Position of the Character so that it get Beamed from one place to the other in one single frame. Unfortunately I cannot get this to work. I tried the following code, without any success… playerbodies.forEach(function (bd) { bd.SetLinearVelocity(new b2.Vec2()); var t = bd.GetTransform(); t.p.x -= 10; bd.SetTransform(t, bd.GetAngle()); }); How can I make that happen?

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  • What are the benefits vs costs of comment annotation in PHP?

    - by Patrick
    I have just started working with symfony2 and have run across comment annotations. Although comment annotation is not an inherent part of PHP, symfony2 adds support for this feature. My understanding of commenting is that it should make the code more intelligible to the human. The computer shouldn't care what is in comments. What benefits come from doing this type of annotation versus just putting a command in the normal PHP code? ie- /** * @Route("/{id}") * @Method("GET") * @ParamConverter("post", class="SensioBlogBundle:Post") * @Template("SensioBlogBundle:Annot:post.html.twig", vars={"post"}) * @Cache(smaxage="15") */ public function showAction(Post $post) { }

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  • Where do I find display brightness controls in Lubuntu?

    - by dlanod
    I'm looking for a control to be able to change my standard display brightness in Lubuntu. I've tried How do I set default display brightness? but my system settings does not include a Screen option. I've also tried Power Manager, Monitor Settings and Screensaver under Preferences and couldn't spot anything to control this option. The function key mappings (this is a laptop) work to change the brightness, but I'm looking for a UI option as the laptop is physically set up to be mouse-based (keyboard is hard to access with how we've got it set up).

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  • Optimization of time-varying parameters

    - by brama
    I need to find an optimal set of "n" parameter values that minimize an objective function (a 2-hr simulation of a system). I have looked at genetic algorithm and simulated annealing methods, but was wondering if there are any better algorithms and guidance on their merits and limitations. With the above optimization methods I can find the optimal parameter values that hold true for the entire simulation duration. Incase, I want to find the optimal "time varying" parameter values (parameter values change with time during the 2-hr simulation), are there any methods/ideas other than making each time varying parameter value a variable to optimize? Any thoughts?

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  • I have a library and several small programs that use it: how should I structure my git repositories?

    - by Dan
    I have some code that uses a library that I and others frequently modify (usually only by adding functions and methods). We each keep a local fork of the library for our own use. I also have a lot of small "driver" programs (~100 lines) that use the library and are used exclusively by me. Currently, I have both the driver programs and the library in the same repository, because I frequently make changes to both that are logically connected (adding a function to the library and then calling it). I'd like to merge my fork of the library with my co-workers' forks, but I don't want the driver programs to be part of the merged library. What's the best way to organize the git repositories for a large, shared library that needs to be merged frequently and a number of small programs that have changes that are connected to changes in the library?

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  • How can I really master a programming language?

    - by cprogcr
    I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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  • PeopleTools 8.54 Pre-Release Notes Available

    - by Matthew Haavisto
    PeopleSoft's PeopleTools recently published pre-release notes for PeopleTools 8.54.  Pre-release notes provide more functional and technical details than the release value proposition. This document describes how enhancements function within the context of the greater business process. This added level of detail should enable project teams to answer the following questions: What delivered functionality will change? How will an upgrade or new implementation affect other systems? How will these changes affect the organization? After the project team has reviewed and analyzed the pre-release notes, business decision makers should be able to determine whether to allocate budget and initiate implementation plans. This document covers the following subjects: Platform support enhancements Development tools enhancements System administration tools enhancements Reporting and analytic tools enhancements Integration tools enhancements Lifecycle management tools enhancements Accessibility PeopleSoft Interaction Hub enhancements.

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  • Is there such a thing as having too many private functions/methods?

    - by shovonr
    I understand the importance of well documented code. But I also understand the importance of self-documenting code. The easier it is to visually read a particular function, the faster we can move on during software maintenance. With that said, I like to separate big functions into other smaller ones. But I do so to a point where a class can have upwards of five of them just to serve one public method. Now multiply five private methods by five public ones, and you get around twenty-five hidden methods that are probably going to be called only once by those public ones. Sure, it's now easier to read those public methods, but I can't help but think that having too many functions is bad practice.

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  • MEF to the rescue in Task-it

    One of the frameworks that I chose to leverage in the development of my Silverlight 4 Task-It application is MEF, the Managed Extensibility Framework. Actually, that decision came while I was at a Silverlight Deep Dive session on the Microsoft campus in Redmond, WA, and came at the recommendation of John Papa (Microsoft Silverlight Evangelist) and Glenn Block (the MEF Maniac). If you are not familiar with MEF, its primary function is to provide a framework for extensibility in Silverlight applications, however, what I found is that MEF's capabilities go beyond just this. As a matter of fact, Microsoft announced at MIX this week that its new Silverlight Analytics Framework would use MEF for composition. You can read about Telerik's support for this new framework here: Telerik is First to Announce Support for Microsoft Silverlight Analytics Framework MEF used to be just one of many frameworks out there that could ...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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  • Interview question ranking FizzBuzz (1), implementing malloc (10)

    - by blrs
    I'd like to have your opinion on the difficulty of the following interview question: Find the subarray with maximum sum in an array of integers in O(n) time. This trivial sounding problem was made famous by Jon Bentley in his Programming Pearls where he uses it to demonstrate algorithm design techniques. On a scale of 1-10, 1 being the FizzBuzz (or HoppityHop) test and 10 being implement the C stdlib function malloc(), how would you rank the above problem? I think the people who can best answer this question are those who have read Programming Pearls and have tried to solve this problem on their own. To motivate those who haven't, 'Programming Pearls' gets featured many times in the 'Top 10 programming books' list.

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  • If my URL's are static, but then parsed by Javascript, does that make it crawlable?

    - by Talasan Nicholson
    Lets say I have a link: <a href="/about/">About Us</a> But in Javascript [or jQuery] catches it and then adds the hash based off of the href attribute: $('a').click(function(e) { e.preventDefault(); // Extremely oversimplified.. window.location.hash = $(this).attr('href'); }); And then we use a hashchange event to do the general 'magic' of Ajax requests. This allows for the actual href to be seen by crawlers, but gives client-side users with JS enabled an ajax-based website. Does this 'help' the general SEO issues that come along with hashtags? I know hashbangs are 'ok', but afaik they aren't reliable?

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  • How to ignore collision between two objects

    - by eren_trigger
    I have a player that shoots in the direction that it is facing. However, the shot that is created when I click, also destroys the player. How would I make the shot ignore collision with the player? Or better yet, how to make a shot destroy anything it touches and destroy itself without affecting the player? This is the code that controls collisions: function OnTriggerEnter (col : Collider) { Destroy(col.gameObject); } The shot is a trigger, but the player isn't. Not sure if this changes anything in this case. Thanks in advance. EDIT: http://gfycat.com/TediousAridFeline

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  • Is it safe to set FPS rate to a constant?

    - by Ozan
    I learned from game class that in update function, every movements must be time dependent for the sake of linearity in movement. We made a simple game. Every move like going left, right or jump is written time dependent. But, in some other computers, our game is worked very differently. For example, our character jumps higher than it should be. I guess this is because each computer has different FPS rate according to its specification. My question is that what should we do to make this game work in same way in every computer? Setting FPS rate to a constant is a solution?

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  • Broken package ubuntuone-control-panel-qt

    - by baale7
    An interrupted installation of updates resulted in ubuntuone-control-panel-qt breaking and now I cannot install or update anything. There seems to be an error in python2.7 - ImportError: No module named _sysconfigdata_nd dpkg: error processing archive ubuntuone-control-panel-qt_13.09-0ubuntu1_all.deb (--install): When I try to reinstall the package via .deb a dpkg --audit yields: The following packages are in a mess due to serious problems during installation. They must be reinstalled for them (and any packages that depend on them) to function properly: ?python-pexpect Python module for automating interactive applications ?ubuntuone-control-panel-qt Ubuntu One Control Panel - Qt frontend ?hplip-data HP Linux Printing and Imaging - data files ?python-libxml2 Python bindings for the GNOME XML library ?apport automatically generate crash reports for debugging The following packages are only half configured, probably due to problems configuring them the first time. The configuration should be retried using dpkg --configure or the configure menu option in dselect: ?python-ubuntuone-client Ubuntu One client Python libraries ?python-ubuntuone-control-panel Ubuntu One Control Panel - Python Libraries --configure or --configure -a doesn't work Any help?

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  • Programming my first C++ program

    - by Jason H.
    I have a basic understanding of programming and I currently learning C++. I'm in the beginning phases of building my own CLI program for ubuntu. However, I have hit a few snags and I was wondering if I could get some clarification. The program I am working on is called "sat" and will be available via command line only. I have the main.cpp. However, my real question is more of a "best practices" for programming/organization. When my program "sat" is invoked I want it to take additional arguments. Here is an example: > sat task subtask I'm not sure if the task should be in its own task.cpp file for better organization or if it should be a function in the main.cpp? If the task should be in its own file how do you accept arguments in the main.cpp file and reference the other file? Any thoughts on which method is preferred and reference material to backup the reasoning?

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  • Futures/Monads vs Events

    - by c69
    So, the question is quite simple: in an application framework, when performance impact can be ignored (10-20 events per second at max), what is more maintainable and flexible to use as a preferred medium for communication between modules - Events or Futures/Promices/Monads ? Its often being said, that Events (pub/sub, mediator) allow loose-coupling and thus - more maintainable app... My experience deny this: once you have more that 20+ events - debugging becomes hard, and so is refactoring - because it is very hard to see: who, when and why uses what. Promices (i'm coding in javascript) are much uglier and dumber, than Events. But: you can clearly see connections between function calls, so application logic becomes more straight-forward. What i'm afraid. though, is that Promices will bring more hard-coupling with them... p.s: the answer does not have to be based on JS, experience from other functional languages is much welcome.

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  • Stop Google Analytics from appending hostname?

    - by Nick Q.
    I've come across an Analytics profile that is appending the rest of a URL to the end of a page's path. For example when looking at the page that exists at http://example.com/page I would expect to see /page but instead it shows me /page/http://example.com/. The profile has no filters applied to it, and until July was reporting as expected (/page), in July the site in question switched hosts (and absolutely nothing else, so I'm not sure that's the problem). The analytics code on the site is the standard Google Async code with a domain set. All other profiles for the site show /page as expected. Any ideas as to how I can get the profile to function as expected?

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  • applyAngularVelocity causes error when called right after object instantiation

    - by Appeltaart
    I'm trying to make a physicsBody rotate as soon as it is instantiated. CCNode* ball = [CCBReader load:@"Ball"]; [ball.physicsBody applyForce:force]; [ball.physicsBody applyAngularImpulse:arc4random_uniform(360) - 180]; Applying force works fine, the last line however throws an error in cpBody.c line 123: cpAssertHard(body->w == body->w && cpfabs(body->w) != INFINITY, "Body's angular velocity is invalid."); When I don't apply force and merely rotate the problem persists. If I send applyAngularImpulse at some later point (in this case on a touch) it does work. Is this function not supposed to be called right after instantiation, or is this a bug?

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  • Graphics problems: noise-like glitch, and screen freezes in Ubuntu 13.04

    - by user207253
    I have recently upgraded to 13.04 and am using unity. I am experiencing two intermittent problems with the graphics: 1) All or part of the screen is taken up by 'noise', which lasts for about a second, see screenshot: 2) The launcher panel freezes. I can still move the mouse and the keyboard responds to function keys (I can dim the screen), but I cannot select anything. At the moment I recover by ctr-alt-f1, and restarting lightdm. My computer is a Samsung Chronos 7 laptop, model NP700Z5C, with Intel HD 4000 graphics The same problems occur with lightdm and gdm. I have attempted to install the intel drivers (as the screenshot hints) but these are not indicated as additional drivers in software & updates so I'm not sure whether they are in use. Any suggestions?

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  • What is the concept behind writing a cancel operation in c++?

    - by ToMan
    I'm attempting to write a cancel operation for a software download application. This application will first transfer the software to the device and then install the software on it. (These are givens I'm not allowed to change). What should the cancel operation do? When a user presses 'cancel', the application should stop transferring/installing the software immediately. Question: Since I've never written a "cancel" function, I'm wondering what are the types of things to consider when writing the code, and what are the common bugs I should expect and how to deal with them? Couldn't find anything in google so if you have some links that would be good reads I'd really appreciate it since I'm not looking for answers I'm just looking for guidelines/macro/concept help

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  • How much C/C++ knowledge is needed for Objective-C/iPhone development?

    - by BFree
    First, a little background. I'm a .Net developer (C#) and have over 5 years experience in both web development and desktop applications. I've been wanting to look into iPhone development for some time now, but for one reason or another always got side tracked. I finally have a potential project on the horizon, and I'm now going full steam ahead learning this stuff. My question is this: I haven't done any C/C++ programming since my schooling days, I've been living in managed land ever since. How much knowledge if any is needed to be successful as an iOS developer? Obviously memory management is something that I'll have to be conscious about (although with iOS 5 there seems to be something called ARC which should make my life easier), but what else? I'm not just talking about the C API (for example, in order to get the sin of a number, I call the sin() function), that's what Google is for. I'm talking about fundamental C/C++ idioms that the average C# developer is unaware of.

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  • Mysql not starting - innodb not found

    - by Rob Guderian
    I have a fresh install of ubuntu 12.04 server edition and mysql server is not starting properly. I did a simple apt-get install apt-get install mysql-server But, it's failing with this error message root@test:~# mysqld 120618 20:57:32 [Warning] The syntax '--log-slow-queries' is deprecated and will be removed in a future release. Please use '--slow-query-log'/'--slow-query-log-file' instead. 120618 20:57:32 [Note] Plugin 'FEDERATED' is disabled. 120618 20:57:32 InnoDB: The InnoDB memory heap is disabled 120618 20:57:32 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120618 20:57:32 InnoDB: Compressed tables use zlib 1.2.3.4 120618 20:57:32 InnoDB: Unrecognized value fdatasync for innodb_flush_method 120618 20:57:32 [ERROR] Plugin 'InnoDB' init function returned error. 120618 20:57:32 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 120618 20:57:32 [ERROR] Unknown/unsupported storage engine: InnoDB 120618 20:57:32 [ERROR] Aborting I can start the server with the "--skip-innodb --default-storage-engine=myisam" flags, but would like to use innodb. Does anyone know what the issue here is?

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  • Passing variables from PHP to C++

    - by Alex
    I’m new to this so I’m sorry if my question is trivial. I have the following situation: I need to call a program from PHP and pass some vars and/or sets of key-value pairs to it. Now, my question is: how do I pass these vars, through arguments to the called function (e.g. exec("/path/to/program flag1 flag2 [key1=A,key2=B]");)? Or is there a better method to achieve this? Somebody suggested me to write them into a txt file and pass the path to it to as an argument instead (e.g. exec("/path/to/program path_to_txt_file);), but I’m not to excited about this method.

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  • How do I set the root password so I can use su instead of sudo?

    - by Zignd
    Warning: Directly logging in as root is like playing with fire, because one little typo is enough to lose critical data or make your system unbootable. Note that desktop environments will also function incorrectly if you login to them as root. See these questions for the reasons behind why sudo is preferred and why root-login is disabled by default: What are the benefits of sudo over su? Why is there no option to login as root? Instead of letting you set a password for root during install Ubuntu set it to * for no password and disables the actual account login, however even with this being said you can still use root in ubuntu by sudo. So how to set a root password on Ubuntu?

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  • Possible to pass pygame data to memory map block?

    - by toozie21
    I am building a matrix out of addressable pixels and it will be run by a Pi (over the ethernet bus). The matrix will be 75 pixels wide and 20 pixels tall. As a side project, I thought it would be neat to run pong on it. I've seen some python based pong tutorials for Pi, but the problem is that they want to pass the data out to a screen via pygame.display function. I have access to pass pixel information using a memory map block, so is there anyway to do that with pygame instead of passing it out the video port? In case anyone is curious, this was the pong tutorial I was looking at: Pong Tutorial

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