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• Numerical stability in continuous physics simulation

  - by Panda Pajama

  Pretty much all of the game development I have been involved with runs afoul of simulating a physical world in discrete time steps. This is of course very simple, but hardly elegant (not to mention mathematically inaccurate). It also has severe disadvantages when large values are involved (either very large speeds, or very large time intervals). I'm trying to make a continuous physics simulation, just for learning, which goes like this: time = get_time() while true do new_time = get_time() update_world(new_time - time) render() time = new_time end And update_world() is a continuous physical simulation. Meaning that for example, for an accelerated object, instead of doing object.x = object.x + object.vx * timestep object.vx = object.vx + object.ax * timestep -- timestep is fixed I'm doing something like object.x = object.x + object.vx * deltatime + object.ax * ((deltatime ^ 2) / 2) object.vx = object.vx + object.ax * deltatime However, I'm having a hard time with the numerical stability of my solutions, especially for very large time intervals (think of simulating a physical world for hundreds of thousands of virtual years). Depending on the framerate, I get wildly different solutions. How can I improve the numerical stability of my continuous physical simulations?

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• New qeep app for Java ME feature phones: meet qeepy people

  - by hinkmond

  Is it "qeepy" if you meet people by using your cell phone instead of, you know, talking to them? Nah. Not if it's a Java ME cell phone! See: Use Qeep to Meet Peeps Here's a quote: Qeep is a free app, and compatible with over 1,000 Java-enabled feature phones... ... Qeep is one of the world's largest mobile gaming and social discovery platforms. Members of the mobile community can play live multiplayer games; blog photos; send sound attacks, text messages and virtual gifts; and meet new friends worldwide. So, go on. Go, use Qeep on your Java ME feature phone to play multiplayer games, blog photos, and meet new friends worldwide. No one will think that you're weird... Not much, at least. Hinkmond

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• Has Microsoft stopped offering the free Internet Explorer Application Compatibility VPC Image for IE 6 testing?

  - by Paul D. Waite

  For some time now, Microsoft has made available free, stripped-down, time-limited Virtual PC images for testing web apps in older versions of IE. The most recent version is here: http://www.microsoft.com/download/en/details.aspx?id=11575 But the XP VPC image has now expired (14th Aug 2011), meaning one can no longer test IE 6 using this method. Have Microsoft made updated XP VPC images available? If not, have they commented on the situation? Do they provide any alternative method to test web apps in IE 6? Update As noted by @PleaseStand, as of 16th Aug 2011, Microsoft has made updated images available that expire on 17th November 2011.

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• What shall I include in a 10 week web technologies course?

  - by Iain

  In September I will be teaching a university module on web technologies. This session will be available to 1st year (freshman) students who don't necessarily have any programming knowledge or know how the web works. In the 2nd semester I will be teaching Flash, which is my specialism, so I know exactly what I am going to teach, but in the 1st semester I will be teaching them web standards technologies - HTML, CSS, JS, jQuery, PHP and MySQL. Where I need advice is how to proportion the emphasis for each part, and which parts of each technology to cover. Another real issue I'm struggling with is how much of the bad old ways should I teach them? Do they need to know about bold as well as strong, etc. UPDATE: based, on your feedback I will only be teaching the latest version of everything - CSS3, HTML5 etc. I'm not sure exactly how long the semester will be but I'm guessing about 10-12 weeks. Each session is a 2 hour lab. Obviously there's only so much I can cover in that time and it will be up to the students to go a research this stuff properly on W3 schools etc. My ideas so far were: Lesson 0 - Course intro and overview of the current tech landscape. What is out there, what will we be learning, what won't we. What is a web server, URL etc. Looking at different example websites and discussing how they work. Lesson 1 - HTML basics (head, body, title, img, table, a, lists, h1, strong etc) Lesson 2 - CSS for styling and layout - fonts, webfonts, float etc Lesson 3 - Intro to programming JS (variables, loops, conditionals, functions) Lesson 4 - more JS programming fundamentals, DOM manipulation Lesson 5 - jQuery - making things fly about and look cool Lesson 6 - XML and Ajax Lesson 7 - PHP basics - syntax, server-side principles Lesson 8 - PHP and MySQL - forms, logins, saving user info Lesson 9 - don't know Lesson 10 - don't know Please let me know if you think this is the right order, what have I missed, how to use any spare sessions etc. Thanks :) UPDATE BASED ON RESPONSES: Thanks for all your responses - some great stuff. To be absolutely clear, this is not a computer science course, it is a practical module on a creative technology course. The emphasis definitely has to be on making cool things work rather than understanding how the backbone of the internet works. That can come later, if the students are interested. At the end of the module I would like the students to be able to produce a web page or pages that does something cool, using some or all of the technologies I cover. Many of these topics are of course far beyond the scope of a 2 hour session, however I do not have the option of reducing the syllabus, I will just have to explain what the technology does and encourage the student to research it in their own time.

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• What developer conferences are you going to this year?

  - by mbcrump

  This short list is what I consider to be the “cream-of-the-crop” in developer conferences. This is also a list of the conferences that I plan on attending in 2011. If you feel your conference is just as good, then shoot me an email at [michael[at]michaelcrump[dot]net, and if possible I will check it out.   In-Person Event Las Vegas on April 18th-22nd, 2011 Redmond on October 17th-21st, 2011 Orlando on December 5th-9th, 2011 Visual Studio Live – I attended this event in November of last year and blogged about my experience. I am also planning on going back to the Orlando session in December of this year. So what did I like the most about this event? Being able to interact one-on-one with a majority of the speakers. If you read my blog post then you will see a list of the speakers that I met up with. I also made a lot of great connections with other professional developers all over the world. They are having an event in Las Vegas on April 18th-22nd. I noticed at this event that they have added a new track on mobile. Being a big fan of mobile, I feel that this is a great move. They also have a great selection for Silverlight Developers including Billy Hollis and Rocky Lhotka. For the full lineup of conference tracks, sessions and speakers visit http://bit.ly/VSLiveTrks. If you are interested in this then you can register here by February 16th. I must add that you can save $300 bucks by getting the early-bird special.   Virtual Conference SSWUG (DBTechCon) - holds the largest virtual conference in the information technology industry. It is also special to me because they selected a majority of my Silverlight content for the April conference. No traveling fees and all of the sessions are recorded so you can watch them on-demand for $189 bucks (early-bird special). For the entire speaker list then click here. The session list has also been published. If you are interested in this then you can register here.   In-Person Event Knoxville, TN on June 3rd/4th 2011. Codestock.org – If you live in the South then you have heard of CodeStock. To my knowledge, they have only had 3 events so far and they were a huge success. It was such a success that after the last event, everyone was telling me how good it was and how much they enjoyed it. They currently have a call for speakers going on right now, so if you have sessions then be sure to submit yours. So, what makes them stand out? Well for starters Michael Neal (organizer) developed an open API so conference attendees could build their own apps for the sessions. They also encouraged their speakers to go to other sessions instead of stay in a “speaker-room”. Another cool feature is that they are uploading videos from the conference so everyone can benefit. They are currently looking for sponsorship, so help out if you can.   In-Person Event Redmond, WA on October 28/29 2011 *NOT 100% SURE AT THIS POINT* PDC 11 – OK, so the logo should be pdc11 but its not out yet. This event is located on Microsoft’s campus in Redmond, WA. It is probably one of the most well known conferences for developers to attend. One of the big perks from this event is that you typically come away with free stuff. In 2010 they gave away Windows 7 Phones. I remember years earlier they gave away laptops. This of course isn’t the only reason to go, you may get to tour the Microsoft campus. Since pdc is a huge event, you can view all the events for free. Mike Taulty created a nice Silverlight application that consumes the OData feed. You can download it here. If everything goes as planned, I will be at all of these events. If you plan on going then send me a tweet and we will do lunch or dinner. I love meeting new developers and talking .net.  Subscribe to my feed

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• Brand New Oracle WebLogic 12c Online Launch Event, December 1st, 18:00 GMT

  - by swalker

  The brand new WebLogic 12c will be released on December 1st 2011. Please join Hasan Rizvi on December 1, as he unveils the next generation of the industry’s #1 application server and cornerstone of Oracle’s cloud application foundation—Oracle WebLogic Server 12c. Hear, with your fellow IT managers, architects, and developers, how the new release of Oracle WebLogic Server is: Designed to help you seamlessly move into the public or private cloud with an open, standards-based platform Built to drive higher value for your current infrastructure and significantly reduce development time and cost Optimized to run your solutions for Java Platform, Enterprise Edition (Java EE); Oracle Fusion Middleware; and Oracle Fusion Applications Enhanced with transformational platforms and technologies such as Java EE 6, Oracle’s Active GridLink for RAC, Oracle Traffic Director, and Oracle Virtual Assembly Builder Don’t miss this online launch event on December 1st, 18:00 GMT. Register Now For regular information become a member of the WebLogic Partner Community please register at http://www.oracle.com/partners/goto/wls-emea

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• Of which bad practice is require calling functions in order a sign?

  - by stijn

  Sometimes I find myself writing comments on class methods like this: class A : public Base { public: /** * Sets variable; * should be called before ImplementsInterfaceMtehod(), * else has no effect. */ void SetSomeVariable( var_type value ); virtual void ImplementsInterfaceMethod(); } The callers of Base::ImplementsInterfaceMethod obviously do not know about the variable, and should not. But the users of A should set the variable if they want it to take effect. It is not required to set the variable (else it could be a parameter for the constructor), so I cannot throw exceptions in ImplementsInterfaceMethod if it is not set. Is this a sign of some typical bad practice? Is there a better way than writing a comment as shown to deal with this?

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• How to get scripted programs governing game entities run in parallel with a game loop?

  - by Jim

  I recently discovered Crobot which is (briefly) a game where each player codes a virtual robot in a pseudo-C language. Each robot is then put in an arena where it fights against other robots. A robots' source code has this shape : /* Beginning file robot.r */ main() { while (1) { /* Do whatever you want */ ... move(); ... fire(); } } /* End file robot.r */ You can see that : The code is totally independent from any library/include Some predefined functions are available (move, fire, etc…) The program has its own game loop, and consequently is not called every frame My question is: How to achieve a similar result using scripted languages in collaboration with a C/C++ main program ? I found a possible approach using Python, multi-threading and shared memory, although I am not sure yet that it is possible this way. TCP/IP seems a bit too complicated for this kind of application.

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• USB sound device not recognized

  - by David E. Anderson

  I have a USB sound device that used to work back when I ran other versions of Ubuntu. Now I can only partially see the device. I have tried many things I saw in Google searches, but none solve my problem. cat /proc/asound/cards sees the device as card 0 aplay -l shows C-Media USB Audio as card 0 alsamixer sees the device asoundconf list does not show the device sound preferences shows no hardware asoundconf-gtk set the device to pulseaudio, but fails with python errors ending in ValueError: too many values to unpack in the function set_default_card. I think this is the cause of my problem. The device is a Sony virtual phones wireless headphone amplifier.

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• Keyboard freezes when xorg crashes

  - by gsedej

  Situation is like that. Many times has happened that Xorg freezes and with it also keyboard. Quite some times because of some Compiz effects or Flash (fullscreen switch). Keyboard becomes totaly unresponsive, while mouse still works (I can move cursor, but can't click since desktop freezes) and music still plays and I can connect trough ssh. This is the only way I know I can try to solve problem - either by killing browser&flash or lastly restarting xorg server. This problem appears on more than one Ubuntu computer. My home dekstop with proprietery nvidia driver, on my work where I use noveau driever (opensource driver for geforce) and sometimes (but rarely) also on laptop with ATI graphics (using r300g driver which is really good!). Can someone explains why mouse still works while I can't input from keyboard? (I can't switch to virtual console or do R-E-I-S-U-B command) I have USB keyboard and USB mouse.

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• How to tell gnome which file to use to change backlight brightness?

  - by cebe

  I have a Dell Inspiron M5010 and I am unable to change my backlight brightness with the F-Keys and it also does not work with gnome brightness widget. I am able to change backlight brightness manually on the terminal with $ sudo -s $ cd /sys/devices/virtual/backlight/dell_backlight $ ls -la insgesamt 0 drwxr-xr-x 3 root root 0 2012-04-06 13:03 . drwxr-xr-x 3 root root 0 2012-04-06 13:03 .. -r--r--r-- 1 root root 4096 2012-04-06 13:17 actual_brightness -rw-r--r-- 1 root root 4096 2012-04-06 13:17 bl_power -rw-r--r-- 1 root root 4096 2012-04-06 13:03 brightness -r--r--r-- 1 root root 4096 2012-04-06 13:03 max_brightness drwxr-xr-x 2 root root 0 2012-04-06 13:17 power lrwxrwxrwx 1 root root 0 2012-04-06 13:03 subsystem -> ../../../../class/backlight -rw-r--r-- 1 root root 4096 2012-04-06 13:03 uevent $ echo 8 > brightness Can I configure gnome power manager to use the right files somehow?

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• SQL Server Transaction Log Fragmentation: a Primer

  Generally, you will have no need to worry about the number of virtual log files in your transaction log. However, if you use the default settings for 'auto-grow', you can end up with such 'fragmentation' in your transaction log as to affect performance noticably. How can this be avoided? How can you tell it's a problem? What do you do about it? Greg explains. "SQL Backup Pro 7 improves on an already wonderful product" - Don KolendaHave you tried version 7 yet? Get faster, smaller, fully verified backups. Download a free trial of SQL Backup Pro 7.

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• I want to learn how to help or contribute to Unity

  - by user17953

  I am a college student studying computer science and would one day like to work on operating systems. The part of ubuntu that really interests me is Unity and I would like to study it and possibly contribute to it. I was reading the wiki pages about it and it was saying to get a copy of all the required components and then start hacking. Would it be wise to do this in a virtual machine with ubuntu on it? Do you have any advice on a good place to start? Do you know of any common pitfalls? Should I also post in the irc for this? Thanks

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• Resources to Help You Getting Up To Speed on ADF Mobile

  - by Joe Huang

  Hi, everyone: By now, I hope you would have a chance to review the sample applications and try to deploy it.  This is a great way to get started on learning ADF Mobile.  To help you getting started, here is a central list of "steps to get up to speed on ADF Mobile" and related resources that can help you developing your mobile application. Check out the ADF Mobile Landing Page on the Oracle Technology Network. View this introductory video. Read this Data Sheet and FAQ on ADF Mobile. JDeveloper 11.1.2.3 Download. Download the generic version of JDeveloper for installation on Mac. Note that there are workarounds required to install JDeveloper on a Mac. Download ADF Mobile Extension from JDeveloper Update Center or Here. Please note you will need to configure JDeveloper for Internet access (In HTTP Proxy preferences) in order the install the extension, as the installation process will prompt you for a license that's linked off Oracle's web site. View this end-to-end application creation video. View this end-to-end iOS deployment video if you are developing for iOS devices. Configure your development environment, including location of the SDK, etc in JDeveloper-Tools-Preferences-ADF Mobile dialog box.  The two videos above should cover some of these configuration steps. Check out the sample applications shipped with JDeveloper, and then deploy them to simulator/devices using the steps outlined in the video above.  This blog entry outlines all sample applications shipped with JDeveloper. Develop a simple mobile application by following this tutorial. Try out the Oracle Open World 2012 Hands on Lab to get a sense of how to programmatically access server data.  You will need these source files. Ask questions in the ADF/JDeveloper Forum. Search ADF Mobile Preview Forum for entries from ADF Mobile Beta Testing participants. For all other questions, check out this exhaustive and detailed ADF Mobile Developer Guide. If something does not seem right, check out the ADF Mobile Release Note. Thanks, Oracle ADF Mobile Product Management Team

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• Is there an API for determining congressional districts?

  - by ardavis

  I'm looking to determine the congressional district based on an address my user is providing. This will avoid having the user to look it up themselves. Does an API of this sort exist? Note Through my attempts to find one, I've only come across these: http://www.govtrack.us/developers/api (not sure how to submit an an address or zip code however) The following resources are available in the API ...Bills and resolutions in the U.S. Congress since 1973 (the 93rd Congress). ...A (bill, person) pair indicating cosponsorship, with join and withdrawn dates. ...Members of Congress and U.S. Presidents since the founding of the nation. ...Terms held in office by Members of Congress and U.S. Presidents. Each term corresponds with an election, meaning each term in the House covers two years (one 'Congress'), as President four years, and in the Senate six years (three 'Congresses'). ...Roll call votes in the U.S. Congress since 1789. How people voted is accessed through the Vote_voter API. ...How people voted on roll call votes in the U.S. Congress since 1789. See the Vote API. Filter on the vote field to get the results of a particular vote... http://www.opencongress.org/api (seems to be a way to find congress information, but not districts) This API provides programmers with structured access to all the data on OpenCongress, everything from official bill info to news and blog coverage to user-generated votes on bills and much more... This API defaults to returning XML. All queries can also return JSON... https://groups.google.com/forum/?fromgroups=#!topic/opendems-discuss/CeKyi_aANaE (similar question, no resolution) I've been looking over Open Dems, and seeing what's exposed at this point and what isn't. I work with Democrats Abroad, and am interested in using stuff from the lab for their sites. I quickly looked over the Precinct API, which does both more and less than what I'd need. An ideal resource would be any way of translating addresses into CD at the very least (getting state district data would be good as well), since that would make it easier for DA's membership to make a difference in races like last month's NY26 race... Update I'm looking at the source for the govtrack.us website and the 'doGeoCode' function may be useful. view-source:http://www.govtrack.us/congress/members If no one has any suggestions, I will try to go off of what they are doing.

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• SVN Checkout folder as local webroot

  - by Shredder

  I have XAMPP installed and running. I have an SVN working directory (WD) on my local that checks out from the repository. I set up a virtual host in xampp to point to my WD, but my browser (FF) gives me a 500 http status error: Either the server is overloaded or there was an error in a CGI script. When I place a regular folder in the same location with the WD and switch names, it works fine.. Can I not use an SVN working directory as a web root folder?

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• how to launch grub menu for ubuntu guests in virtualbox?

  - by Ubuntuser

  I have ubuntu 12.04 alpha installed in virtualbox. When the virtual machine is started, it boots directly to the login screen without showing the grub menu. How can I get the grub menu to show up on start? Please note: the graphics is broken after recent updates, so i cannot login and make the changes. it is stuck at the screen "Ubuntu is running on low graphics mode" and the mouse and other keys do not work. [URL=http://img862.imageshack.us/i/screenshotat20120127171.png/][IMG]http://img862.imageshack.us/img862/9783/screenshotat20120127171.th.png[/IMG][/URL]

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• Upgrade to Quantal unity top bar, side bar, and window declorations missing

  - by Nicky Bailuc

  I upgraded from 12.04.1 to 12.10 via the Update Manager and the upgrade said it completed successfuly. However after rebooting the unity task bar was missing along with the launch bar and the window declorations. All compiz settings seemed to be purge deleted, and at first bootup it gave me a system error. The desktop exists, and once I remember I messed up the compiz settings and just had to press Ctrl+Alt+F1 and in the virtual terminal type "unity --reset" then "sudo reboot". Everything worked as if i reinstalled the entire operating system. This time it said “Warning no variable set. setting to :0. The reset option is now dupricated”. What am I suppose to do now? I need this fixed as soon as possible because I need a couple of certainly installed programs and the data within them (long story short).

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• Demonstration Image BIC2G for Partners (OBI, Exalytics, BI-Apps, and EPM)

  - by Mike.Hallett(at)Oracle-BI&EPM

  There is now available the new version of the VirtualBox Demonstration Image, "BIC2g 2012-10" for Partners; including support for OBI, Exalytics, BI Applications, and EPM Hyperion applications. This is a demonstration, training and POV image that contains BI/Exalytics, BI Applications, and EPM product (software). It was originally developed to support internal Oracle Exalytics training, and has been expanded to include BI Applications. It is an OVA virtual appliance that can be imported into VirtualBox. Details can be found in the BIC2g Partner Edition Exalytics Readme and BIC2g Partner Edition Deployment Guide, and it can be downloaded from the Partner FTP site at /static/BIC2G (see BI Solutions Engineering Partner Portal for connection information and further detail on Demonstration Images for Partners).

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• Root access issues - how do others manage this?

  - by Ciaran Archer

  Hi there I use my Ubuntu 10.04 LTS instance (via Virtual Box on Windows 7) with a non-root user. I am trying out developing Rails applications and I notice that I need to run some rails commands with sudo. The problem this gives me is some files are created by the root user then, and I cannot edit them via a GNOME window with my logged in user. What is the correct thing to do here? Should I somehow always login as root? If so how? Is there some way for me to give all files under my home directory (where I do all my Rails work) the correct permissions for all users, so I can edit them with my logged in user via a window? At the moment I have to resort to opening a file via the command line like this sudo gedit myFile.rb - this is not very sustainable! Thanks in advance!

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• Which tools helps to start Ubuntu GUI when boot?

  - by Vimal Kumar

  I am on the way to create a Live CD from scratch. I used Virtual Box for this purpose. I installed Ubuntu base from ubuntumini.iso and installed gnome-shell. And installed Remastersys and created a backup.iso. Burned in a CD and boot from a PC. It end in CLI. Not lead to GUI. I tried the same ISO in VirtualBox. But it work properly there. I think I missed some packages which help to start GUI. Can you help me to identify the packages missed to include in the CD?

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• What is a safe ulimit ceiling?

  - by Kaustubh P

  This is the output of ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited This is a 64bit install, and I would like to increase the max-open files from 1024 to a more heady limit such as 5000. Will that be any problem? Will it cause instability? Thanks.

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• How can I run Tellme more software on Ubuntu 14.04 LTS?

  - by Alex Walker

  I'm new to Ubuntu and I've been loving it so far, I have it on my 2 computers and I think everyone should try it. I run an English Laboratory in a University (Our PC's are old and slow) so I want to install Ubuntu on all of them so the students can have a better experience here, the problem is tha we NEED Tell me more Software which I believe it's only for windiws. How can I install it in ubuntu? do I need wine or a virtual machine with Windows? please help! and thank you so much!!

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• MAMP Pro Installed On Mavericks 10.9

  - by cnps

  I have MAMP Pro Installed. I'm well aware with the advanced features of MAMP Pro I can change to different types of Hosts, but I wanted to know why my previous method would not work within mavericks. This was my usual working method in 10.8, but now with 10.9 it's a headache. The previous method would: Write a custom address with the host address: "#Virtual Hosts" 127.0.0.1 nameofsite.local go to /Applications/MAMP/conf/apache and open the httpd.conf file, scroll to the bottom and then add NameVirtualHost * DocumentRoot "/Applications/MAMP/htdocs" ServerName localhost DocumentRoot "/Users/Klimt/Sites/siteoffolder" ServerName clientA.local make sure the ports is set to 80, 443, 3306. reset MAMP PRO and then usually type in the url address and it's gold from there. any help?

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• How do I install xulrunner in 12.04?

  - by chessplayer

  I am trying to migrate a virtual machine I use for my classes at the university from 10.04 to 12.04 and in that I am using xulrunner so that first, I can have SQLiteManager as a stand alone app next, KNIME can provide help for its nodes I tried adding the the mozilla ppa as described in some posts, e.g. here or here, but when I search for xulrunner in Synaptic I get no match. I read in this link, that xulrunner was left out intentionally, which, frankly, I think is a bad decision! Anyway, does anyone know a way out of this, i.e. how to get xulrunner for 12.04? Any help appreciated!

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