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• Why does 12.04 freeze when using multiple desktops?

  - by Dustin

  I am using 12.04 32-bit, upgraded from 11.10. Within the last week and a half Unity has hung on me with no option but a hard reboot, which I hate. It usually happens when I am using multiple desktops and applications and switching desktops. The screen just hangs, sometimes broken between desktops and applications, I can move my mouse but cannot click on anything. alt+f2 , HUD , super+w/s/d and alt+tab/~ does nothing, they do not activate. I let it rest for 15-20 minutes in hopes it will sort itself out but nothing. I'd hate to move to Unity 2D, but I can't risk having to do hard reboots/shutdowns, or moving to a different DE. Other information: the only PPA's I have added recently would be the word lens. 2.8GB RAM processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 127 model name : AMD Sempron(tm) Processor LE-1250 stepping : 2 microcode : 0x83 cpu MHz : 1000.000

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• Which programming language suits a system that must work without user input

  - by Ruud

  I'm building a prototype of a device that will function much alike a digital photoframe. It will display images retrieved from the internet. The device must start up and run the photoframe. It will have no user interface. The device has a minimal ubuntu installation, but I could install Xorg or whatever needed. Question: I have trouble figuring out which programming language will be suitable. I've just started using Python to try out several things and I am able to download and display images. I guess that means Python can do what I'd like, but is it suitable as a language that will be run on boot without any user interference? Related questions: - How do I set up Linux to start that script automatically? - How to setup a second Python script as a server that runs in the background to retrieve images before they are displayed (Because I think I'll need threading of some sort?)

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• What are the most common stumbling blocks when it comes to learning programming, in order of difficulty?

  - by blueberryfields

  I seem to remember that linked lists, recursion, pointers, and memory management are all good examples of stumbling blocks - places where the aspiring programmer typically ends up spending significant time trying to understand a concept before moving on and improving, and many end up giving up and not improving. I'm looking for a complete/comprehensive list of these types of stumbling blocks, in rough estimated order of difficulty to learn, with the goal of making sure that an educational program for programmers is structured to properly guide students through them Is this information available somewhere? Ideally, the difficulty to learn will be measured in some sort of objective manner (ie, % of students which consistently fail to learn the concept) What sources are most appropriate for obtaining this information?

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• Asus 1215n GPU driver/s don't give me a "full" OS experience

  - by AFD

  I'm use to not having specific drivers from a manufacture on my laptop when running a Linux OS and that has always been fine - there's been adequate FOSS drivers for my needs and it hasn't ruined any of my OS experience. When I bought an Asus 1215n one of the upsides to the hardware seemed to be the switchable GPU that could give lots of performance or lots more battery life and would switch on-the-fly... with Windows of course. Seems that the Nvidia driver are crap and people advise not installing them. I have some sort of workaround for vga_switcharoo (?) and the on-the-fly nature of the GPUs has turned in to a manual one :( The worst bit though (aside from shorter battery life) is the web experience with HTML5. If I visit Mozilla's Web O'Wonder site I'm told I don't have WebGL working due to driver issues. This really blows - is it possible that proprietary drivers can now ruin my web experience too?!

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• How To View Upcoming Weather, Sports Games, TV Shows, and More in Google Calendar

  - by Chris Hoffman

  Google Calendar isn’t just a tool to keep track of your own events. You can subscribe to a number of special calendars that automatically update with the latest weather, sports games, air times for your favorite TV shows, and more. This is the sort of thing that a paper calendar could never do, and what makes digital calendars like Google Calendar so useful. Add some automatically updating calendars and you’ll wonder how people ever used paper calendars. HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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• Make a flowchart to demonstrate closure behavior

  - by thomas

  I saw below test question the other day in which the author's used a flow chart to represent the logic of loops. And I got to thinking it would be interesting to do this with some more complex logic. For example, the closure in this IIFE sort of boggles me. while (i <= qty_of_gets) { // needs an IIFE (function(i) promise = promise.then(function(){ return $.get("queries/html/" + product_id + i + ".php"); }); }(i++)); } I wonder if seeing a flowchart representation of what happens in it could be more elucidating. Could such a thing be done? Would it be helpful? Or just messy? I haven't the foggiest clue where to start, but thought maybe someone would like to take a stab. Probably all the ajax could go and it could just be a simple return within the IIFE.

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• Amazon Affiliate search using a movie title

  - by Matt Walker

  I am currently working on a movie trailer site. I have over 300 movies and I do not want to add an amazon affiliate link to each one individually. Does amazon offer any sort of api that will allow me to use a movie title to search for a dvd on amazon? Ex. For the movie skyfall, the amazon affiliate link would be amazon.com/search/dvd/skyfall/affiliateid ^ I just made the link up as i don't know how their system works, but I just want it to do a search on the movie title Thanks in advance for any help you can give me!

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• Where to find algorithms work?

  - by Misha

  The funnest parts of my projects have been the back-end algorithms work. I have worked on projects where I implemented Gaussian Mixture models, a Remez algorithm and a few Monte Carlo schemes. I loved figuring out how these processes worked and tuning them when they didn't. I recently graduated and my problem lies in the work I was able to find. The only jobs I have found, with my Electrical Engineering degree, are for writing user applications. Tasks such as fashioning web interfaces or front-ends for hardware devices. When I speak with potential employers about my interests they say they have no work of the sort. Where does one find work that involves implementing these kind of schemes?

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• What would most games benefit from having?

  - by Phil

  I think I've seen "questions" like this on stackoverflow but sorry if I'm overstepping any bounds. Inspired by my recent question and all the nice answers (Checklist for finished game?) I think every gamedev out there has something he/she thinks that almost every game should have. That knowledge is welcome here! So this is probably going to be an inspirational subjective list of some sorts and the point is that anyone reading this question will see a point or two that they've overlooked in their own development and might benefit from adding. I think a good example might be: "some sort of manual or help section. Of course it should be proportional to how advanced the game is. Some users won't need it and won't go looking for it but the other ones that do will become very frustrated if they can't remember how to do something specific that should be in the manual". A bad example might be "good gameplay". Of course every game benefits from this but the answer is not very helpful.

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• Unity 3D coding language, C# or JavaScript [on hold]

  - by hemantchhabra

  Hello to the gaming community. I am a budding game designer, learning to code for the first time in my life. I did learned c++ in school, 8 years back, so I sort of understand the logic when people are doing coding and I can suggest them the right route also, but to an extent I can't code. I am beginning to learn coding for Unity 3D. Which one do you suggest is more versatile and easier to work on for future, because I am a game designer not a coder, I would do coding until I don't have anyone else to code for me. It should be easy and fast to learn, functional and universal to apply, and innovative at the same time. C# or JavaScript ? Thank you for your time Ps- if you could suggest me steps to learn and tutorials to look for, that would be just awesome.

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• Downgrading from ubuntu 11.10 to 10.10, keeping installed programs

  - by Peter

  I recently upgraded from 10.10 to 11.04 then 11.10, and I'd like to revert back to 10.10. I understand that you cannot downgrade a version as easily as you can upgrade, and that I'll probably have to get the boot CD again and reinstall the whole thing. I know that I can keep most of my files by saving the /home directory, so 2 questions: Once I've gone back to 10.10, can I juts copy my old version of home over the freshly installed one? Is there a way to keep all of my installed programs, or some sort of way of getting the new install to automatically install them? Will I have to go through the tricky setups of things like TeX all over again? Thanks

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• Set secondary receiver in PayPal Chained Payment after the initial transaction

  - by CJxD

  I'm running a service whereby customers seek the services of 'freelancers' through our web platform. The customer will make a 'bid' which is immediately taken from their accounts as security. Once the job is completed, the customer marks it as accepted and the bid gets distributed to the freelancer(s) as a reward. After initially storing these rewards in the accounts of the freelancers and relying on MassPay to sort out paying them later, I realised that your business needs to be turning over at least £5000/month before MassPay is switched on. Instead, I was referred to Delayed Chained Payments in PayPal's Adaptive Payments API. This allows the customer to pay the primary receiver (my business) before the payment is later triggered to be sent to the secondary receivers (the freelancers). However, at the time that the customer initiates this transaction, you must understand that nobody yet knows who will receive the reward. So, before I program this whole Adaptive Payments system, is it even possible to change or add the secondary receivers after the customer has paid? If not, what can I do?

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• What steps/tools/apps are necessary to make local php development on a tablet viable?

  - by Tchalvak

  I do my php web development locally, as in, creating a local instance of a site and then coding it and then pushing code to servers via git/github. I'm considering getting an android tablet or ipad and a wireless keyboard for very mobile development, but I in no way want to go back to the bad old days of using ftp and syncing up code changes on a development server directly, that would be too much of a trade-off to interest me. Is there enough support for the stack to develop php websites locally on a tablet? Anyone had experience trying this sort of thing?

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• Which mobile device is appropriate as a utility tool for a web master?

  - by Kayle

  Basically, I'm looking for a device to use on the road and I would prefer to not have to sit down for the majority of the tasks (which rules out netbooks, in my mind). I'm also hoping to spend less than $500. This is what I'd like to "capably" be able to do on the device: Browse the web in non-mobile format, flash is a plus Email, chat, etc Have access to a decent text editor and ftp OR a browser that supports BESPIN/ACE Some sort of SSH support I'm looking at rooted Android phones and iPhone/iPads... though the phone aspect is only icing (it would be cool to consolidate the two devices and have net access through cell networks, but I'm not married to the idea). Are there cheap linux tablets that are ready for prime-time yet? I suppose that would be ideal. All suggestions welcome!

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• Find out if there is a local user logged in when logging in over ssh

  - by sebastiangeiger

  I need to run some calculations on a machine that I can only access remotely but also serves as a work station. There are many of them and I want to pick a "free" one. Free means in this case that no one is logged in locally. My first try was the who command, but for some reason it only lists "selected" users and I can't really find out how they are selected. Next try: ps aux | cut -d " " -f1 | sort | uniq: better showing a bunch of demons but also the local user that was not displayed by who. My current solution is to go in and do ps aux | grep "gnome-session" which is better but still gives me a lot of junk. Ideally I am looking for something that I can include in my ssh profile that warns me about (active) local users when I log in.

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• How can I restart compiz from tty? (& Related, how can I set up a fallback WM?)

  - by Jon

  So I'm testing Natty, and Compiz keeps crashing on me. I expect this sort of thing from alpha software, of course, but it doesn't always give me the option to restart compiz, and for some reason doesn't have a fallback WM configured. Without a window manager, all my programs are still running, but they're not accepting input from the keyboard, and I can't switch between them. I can, however, press Ctrl+Alt+F1 and get a terminal, and I can killall Xorg to reset everything, but I'd rather just reset compiz if possible. If I try typing compiz --replace there in the tty, it complains "fatal--couldn't open display." Is there a way to have tty1 restart compiz? Like compiz --replace --display=something? Additionally, is there a way to configure a fallback window manager so that there's an easier way to recover from compiz crashing?

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• Better control on code updates

  - by yes123

  I will briefly explain my situation. I have a website in PHP, this website is powered by a custom framework + some "plug-in" made ad hoc for it. I am the only developer of this. Until now I just test locally any changes than I upload the php files via FTP. I don't feel confortable anymore with this. The code base has grown quite a lot and I need some sort of system that helps to keep track of changes (line by line) and can restore to an old version easly if something goes wrong. Are there any good solution for this? Note: I never used something like version control or subversion because I think they are too much for this situation (I am the only developer and I just need basic feature) Note2: Something with a nice web interface would be perfect, I can pay for a good service too As now I found: http://beanstalkapp.com/ http://github.com/ http://www.codespaces.com/ http://codesion.com/ https://bitbucket.org/

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• What are best practices for testing programs with stochastic behavior?

  - by John Doucette

  Doing R&D work, I often find myself writing programs that have some large degree of randomness in their behavior. For example, when I work in Genetic Programming, I often write programs that generate and execute arbitrary random source code. A problem with testing such code is that bugs are often intermittent and can be very hard to reproduce. This goes beyond just setting a random seed to the same value and starting execution over. For instance, code might read a message from the kernal ring buffer, and then make conditional jumps on the message contents. Naturally, the ring buffer's state will have changed when one later attempts to reproduce the issue. Even though this behavior is a feature it can trigger other code in unexpected ways, and thus often reveals bugs that unit tests (or human testers) don't find. Are there established best practices for testing systems of this sort? If so, some references would be very helpful. If not, any other suggestions are welcome!

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• Confused about what makes up the Ubuntu GUI

  - by RafLance

  I am now getting more into customizing my Ubuntu experience and want to understand better what all these different things I keep running into are. What is Gnome3 and Gnome2 in relation to GTK3 or GTK2? Are they related at all? Is Gnome3 another version of Unity? What is Unity? What is compiz? To make this all VERY basic, the core question is: How is the Ubuntu GUI built? What are the elements from the bottom-up that make up the desktop environment? Trying to understand this better so I know what I need/want in order to have my desktop the way I would like it. If this question is better suited for a forum of some sort, please let me know and I will understand completely. Thanks in advance!

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• Can I speed up File Sync for Ubuntu One?

  - by tapan

  I am using ubuntu 11.04 on my home laptop and the same on my work laptop. I just wanted to sync the work folders on my home laptop to my office laptop which is ~300Mb of data. This would normally be a short download but ubuntu-one is taking forever to sync it. Any ideas what could cause this? I am not behind any firewall or anything of that sort. I have not checked the limit bandwidth box in the preferences.

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• Efficient way to calculate "vision cones" on 2D tile map?

  - by OverMachoGrande

  I'm trying to calculate which tiles a particular unit can "see" if facing a certain direction on a tile map (within a certain range and angle of facing). The easiest way would be to draw a certain number of tiles outward and raycast to each tile. However, I'm hoping for something slightly more efficient. A picture says a thousand words: The red dot is the unit (who's facing upwards). My goal is to calculate the yellow tiles. The green blocks are walls (walls are between tiles, and it's easy to check if you can pass between two tiles). The blue line represents something like the "raycasting" method I was talking about, but I'd rather not have to do this. EDIT: Units can only be facing north/south/east/west (0, 90, 180, or 270 degrees) and FoV is always 90 degrees. Should simplify some calculations. I'm thinking there's some sort of recursive-ish/stack-based/queue-based algorithm, but I can't quite figure it out. Thanks!

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• How to distribute applications?

  - by Dr Deo

  I am new to Ubuntu development. As a learning experience, I have written a custom chat application using qt4 and I want to deploy it in some sort of setup file. Whats the easiest way of deploying an application viz a viz setting desktop icons. automatically requesting for administrator privileges to execute. inserting an entry into the startup menu. automatically compress my application and reduce download size. automatic startup for my application without user intervention I am familiar with using NSIS scripts on Windows, but I don't know where to begin on Ubuntu. I would preffer a solution similar to NSIS scripts.

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• Terminator Skull Crafted from Dollar Store Parts [Video]

  - by Jason Fitzpatrick

  Earlier this year we shared an Iron Man prop build made from Dollar Store parts. The same Dollar Store tinker is at it again, this time building a Terminator endoskull. James Bruton has a sort of mad tinker knack for finding odds and ends at the Dollar Store and mashing them together into novel creations. In the video below, he shows how he took a pile of random junk from the store (plastic bowls, cheap computer speakers, even the packaging the junk came in) and turned it into a surprisingly polished Terminator skull. Hit up the link below for the build in photo-tutorial format. Dollar Store Terminator Endoskull Build [via Make] How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• Store and create game objects at positions along terrain

  - by Alex

  I have a circular character that rolls down terrain like that shown in the picture below. The terrain is created from an array holding 1000 points. The ground is drawn one screen width infront and one screen width behind. So as the character moves, edges are created infront and edges are removed behind. My problem is, I want to create box2d bodies at certain locations along the path and need a way to store these creator methods or objects. I need some way to store a position at which they are created and some pointer to a function to create them, once the character is in range. I guess this would be an array of some sort that is checked each time the ground is updated and then if in range, the function is executed and removed from the array. But I'm not sure if its even possible to store pointers to functions with parameters included... any help is much appreciated!

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• Store VOD wmi data in a database directly or use CQRS?

  - by JD01

  I need to collect Video on demand bandwidth usage every few minutes (or maybe ever few seconds) and store this in a database so users can produce graphs on bandwidth usage over a period of time (few hours, days, weeks or even possibly months). So the sort of data that will be stored will be the number of users watching videos, current server bandwidth (Mb/s), multicast bit rate etc. I am wondering whether using CQRS would be a good approach with Event sourcing as I can then rebuild my objects to create different projections (I.e. different graphs/reports etc) but then again it seems like I am introducing complexity which might not be needed. Or would it be best to just put the data directly in a database (currently using PostGres) directly and query off that? Having thought about it, my table is a form of audit log anyway, so I don't think I need event sourcing at all. Any thoughts?

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