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• "Failed to create swap space" error during installation

  - by Welsh Heron

  I've been trying to install Ubuntu for the past two days or so, but I've been running into a problem: every time I run the installation program on the LiveCD, I always get the same (or a very similar) error: "Failed to create Swap space The creation of swap space in partition #3 of SCSI5 (0,0,0)(sda) failed." So far, I've run DBAN (Darik's Boot and Nuke) on my HDD once, to make absolutely sure that everything on it had been erased. Then, I simply put in the LiveCD, and let it run the automated install. I get the above error directly after I tell it to automatically partition the HDD (it will work for a second or so, then this will pop up), forcing me back to the screen that lets me choose whether I want to automatically or manually partition the HDD. Well, after failing to install the software manually, I did a little research and learned enough about partitioning Linux to use the 'Manual partitioning' option. I partitioned the HDD as follows (it's a 1TB drive): /home - (the rest)- ext2, / - 20GB - ext2, /boot - 100MB - ext2, /swap - 8GB /EFIboot - 40MB The only difference when I tried this method was that I got THIS message: "Failed to create Swap space The creation of swap space in partition #2 of SCSI5 (0,0,0)(sda) failed." Basically, the only difference was that there was now a '2' instead of a '3'. If I may ask, what exactly am I doing wrong? I've tried looking around the internet (that's basically all I've done for the last two days), but no one seems to have the same problem that I have, and I've tried most of the solutions for similar problems (DBAN, formatting partitions in ext2 format, etc). The only thing I haven't tried is using the terminal to manually partition the HDD...and I actually DID try to do this, but I wasn't able to get past 'su' 's password demand, so I wasn't able to use the terminal. Thank you for your help in advance. ~Welsh

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• Bad 3D Performance in Ubuntu 12.04

  - by Pandem

  I already posted a question before but I didn't really get any advice/help. I'll be a bit more brief/general in hope it'll help. I have an MSI HD 7850 with the Catalyst 12.4 drivers installed. I've found that I'm having bad 3D performance for some reason but I'm not entirely sure what. I suspect it may just that the graphics card is new and AMD just need to work on their drivers but it would be nice to get advice and narrow the problem down so that I can be sure rather than wait for driver updates that may not even help. I ran gxlgears to give some general idea of how bad the performance is. At default size it is averaging around 2000 FPS. The command glxinfo confirms the renderer is using AMD Radeon HD 7800 Series with OpenGL version 4.2. Edits below: As asked for others: lspci -v output is here. fglrxinfo output is here xvinfo output is here glxinfo | grep rendering says yes for direct rendering. These confirmed that everything was configured correctly. Within Unity and Gnome Classic: glxgears had an FPS of around 2000 FPS fgl_glxgears had an FPS of around 544 FPS Within LDXE: glxgears had an FPS of around 4600 FPS fgl_glxgears had an FPS of around 1600 FPS In the end it was discovered that Compiz was causing a large performance decrease and solution was simply to change window manager for the time being. Thanks to TechZilla for all his help!

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• Windows Azure Virtual Machines - Make Sure You Follow the Documentation

  - by BuckWoody

  To create a Windows Azure Infrastructure-as-a-Service Virtual Machine you have several options. You can simply select an image from a “Gallery” which includes Windows or Linux operating systems, or even a Windows Server with pre-installed software like SQL Server. One of the advantages to Windows Azure Virtual Machines is that it is stored in a standard Hyper-V format – with the base hard-disk as a VHD. That means you can move a Virtual Machine from on-premises to Windows Azure, and then move it back again. You can even use a simple series of PowerShell scripts to do the move, or automate it with other methods. And this then leads to another very interesting option for deploying systems: you can create a server VHD, configure it with the software you want, and then run the “SYSPREP” process on it. SYSPREP is a Windows utility that essentially strips the identity from a system, and when you re-start that system it asks a few details on what you want to call it and so on. By doing this, you can essentially create your own gallery of systems, either for testing, development servers, demo systems and more. You can learn more about how to do that here: http://msdn.microsoft.com/en-us/library/windowsazure/gg465407.aspx   But there is a small issue you can run into that I wanted to make you aware of. Whenever you deploy a system to Windows Azure Virtual Machines, you must meet certain password complexity requirements. However, when you build the machine locally and SYSPREP it, you might not choose a strong password for the account you use to Remote Desktop to the machine. In that case, you might not be able to reach the system after you deploy it. Once again, the key here is reading through the instructions before you start. Check out the link I showed above, and this link: http://technet.microsoft.com/en-us/library/cc264456.aspx to make sure you understand what you want to deploy.  

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• WolframAlpha Can Now Do In-depth Analysis of Your Facebook Account

  - by Jason Fitzpatrick

  If you’re a big fan of WolframAlpha’s ability to crunch the numbers on just about anything–and we certainly are–you’ll likely be just as delighted as we were to watch it massage the data from your Facebook account. Find out your most liked, discussed, and shared posts, see your Facebook habits, and other neat trends. I unleashed it on my account this morning, not sure what to expect from the results. Within the results tabulation WolframAlpha provided me with all sorts of neat data break downs. I now know exactly how many days it is to my next birthday, the composition of my aggregate posting habits (how many posts are status updates, links, or photos), the time of day when I do the most posting (and what the composition of those posts is), and my average post length. I also know my most liked post and my most commented on post. It will even crunch the numbers on your network of friends (60.6% of my friends are married, for example). By far one of the more interesting data analysis it does on the friendship data, however, is organizing all your friends into relationship clusters so you can see who in your Facebook network is friends with other people in your Facebook network. The service from WolframAlpha is free: simply visit the WolframAlpha search portal and type in “Facebook report” to start the process. You’ll be prompted to create a WolframAlpha account if you don’t have one and to authorize the WolframAlpha Facebook app to access your data. Your Facebook data is cached to your WolframAlpha account for one hour in order to crunch the numbers and display the results. WolframAlpha HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows? Java is Insecure and Awful, It’s Time to Disable It, and Here’s How

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• What electronic user-story-mapping tools can you recommend?

  - by azheglov

  Agile software development relies heavily on a work item type called user stories. For example, you have a backlog full of user stories and you can select a few of them to work on during the next sprint. But where and how do you find user stories to put into the backlog? There is a popular technique for doing that called story mapping. Jeff Patton invented it and here is the definitive guide on how to do it. The question is, what electronic tools are out there that support Patton's story-mapping technique? I've done a bit of research, found Pivotal and Rally plug-ins (but I'm not a customer of either) and I'm currently experimenting with SilverStories. What other tools are out there? What have you used? What do you (not) recommend? Why? UPDATE: Some people who wrote comments seem to lean towards an answer that applying this technique is simply impossible with an electronic tool and we should just accept that. Can't someone write it up as an answer?

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• Shared Folders in VirtualBox on Windows 7

  In my adventures with VirtualBox, my latest victory was in figuring out how to share folders between my host OS (Windows 7) and my virtual OS (Windows Server 2008).  Im familiar with VirtualPC and other such products, which allow you to share local folders with the VM.  When you do, they just show up in Windows Explorer and all is good.  However, after configuring shared folders in VirtualBox like so:   I couldnt see them anywhere within the machine. Where are Shared Folders in a VirtualBox VM? Fortunately a bit of searching yielded this article, which describes the problem nicely.  It turns out that there is a magic word you have to know, and that is the share name for the host OS: \\vboxsrv Once you know this, mapping shared folders is straightforward.  From Windows Explorer, click on the Map network drive option, and then map a drive to \\vboxsrv\YOURSHAREDFOLDER Like so: With that, its easy to share folders between the client and host OS using VirtualBox.  The reason I didnt simply use a standard network share to my host OS machine name is that both guest and host are in a VPN, and the VPN is over the Internet and in a different country, so when I went that route my files were (apparently) traveling from host to guest by way of the remote VPN network, rather than locally.  Using the Shared Folders feature dramatically sped up my ability to transfer files between Host and Guest machines. 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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• Nvidia optimus and Steam (on 12.04)

  - by Seiryuu

  I've obtained a copy of the .deb for the Steam beta, but it was pretty disappointing to see that it simply doesn't run. Hardware - Dell XPS L502, with Nvidia Optimus I have bumblebee installed. Trying to run Steam with the Intel HD 3000 completely fails to start it. Message received Installing breakpad exception handler for appid(steam)/version(1352224866_client) followed by a crash with no other information provided. Trying to optirun steam runs the client, but as soon as it gets to the home screen, it says that the Nvidia drivers I am using are out of date (and Steam requires newer drivers to run). It's probably worth to note that it throws the same Installing breakpad... error when run with optirun, but it doesn't crash the client immediately. Any way to fix this? Also, is there a way of manually updating the drivers in bumblebee without breaking anything? Alternatively, is there a reliable way of completely disabling the Intel GPU (in order to use the Nvidia GPU exclusively)? Note: I am using Xmonad with gnome-fallback, if that makes a difference. However, when I tried everything mentioned with Unity (2d), everything was the same, so I guess it has nothing to do with the window manager in use.

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• sublime text 2 review !

  - by Anirudha

  Few months ago I am looking for a editor to doing simply edit on html,css,javascript.  Before it I tried notepad++ which is quite awesome to do all works I want to get done with him.  I choose 2 editor on my list. first is sublime text and second is phpstorm. both are cross-plateform. I tried both and both is working fine. I finally go with sublime text 2.   Here is the reason why sublime text 2 is awesome. phpstorm and sublime text 2 both is licensed  software. In sublime text 2 you can use it for unlimited time when phpstorm is available for 30 days only. Sublime text 2 is very memory efficient and lightweight software this is first thing people found best in sublime text 2. in phpstorm problem for me is sometime it’s goes unresponsive when I tried html5 boilerplate. sublime text 2 is never hang depend on memory size of project compare to phpstorm. in Sublime text 2 you can got better speed at coding after learning some shortcut and basic thing applied specially sublime text 2. Sublime text 2 come with distraction free mode when phpstorm have nothing with full-screen. Sublime text 2 support almost every language. I have seen many people in community who has move from their PHP IDE to sublime text 2. You can use LESS and coffeescript in it. There are many kind of customization out in github regarding sublime text 2.   In past I also have also tried webmatrix. the latest version of webmatrix have nothing good as sublime text 2. Sublime text 2 is best fit for my requirement.   So cheers, people should tried once Sublime text 2 if they are look for a solid tool for learning new things. sublime text 2 can be downloaded from http://www.sublimetext.com/.   Thanks for reading my post.

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• How should I unbind and delete OpenAL buffers?

  - by Joe Wreschnig

  I'm using OpenAL to play sounds. I'm trying to implement a fire-and-forget play function that takes a buffer ID and assigns it to a source from a pool I have previously allocated, and plays it. However, there is a problem with object lifetimes. In OpenGL, delete functions either automatically unbind things (e.g. textures), or automatically deletes the thing when it eventually is unbound (e.g. shaders) and so it's usually easy to manage deletion. However alDeleteBuffers instead simply fails with AL_INVALID_OPERATION if the buffer is still bound to a source. Is there an idiomatic way to "delete" OpenAL buffers that allows them to finish playing, and then automatically unbinds and really them? Do I need to tie buffer management more deeply into the source pool (e.g. deleting a buffer requires checking all the allocated sources also)? Similarly, is there an idiomatic way to unbind (but not delete) buffers when they are finished playing? It would be nice if, when I was looking for a free source, I only needed to see if a buffer was attached at all and not bother checking the source state. (I'm using C++, although approaches for C are also fine. Approaches assuming a GCd language and using finalizers are probably not applicable.)

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• SSDT gotcha – Moving a file erases code analysis suppressions

  - by jamiet

  I discovered a little wrinkle in SSDT today that is worth knowing about if you are managing your database schemas using SSDT. In short, if a file is moved to a different folder in the project then any code analysis suppressions that reference that file will disappear from the suppression file. This makes sense if you think about it because the paths stored in the suppression file are no longer valid, but you probably won’t be aware of it until it happens to you. If you don’t know what code analysis is or you don’t know what the suppression file is then you can probably stop reading now, otherwise read on for a simple short demo. Let’s create a new project and add a stored procedure to it called sp_dummy. Naming stored procedures with a sp_ prefix is generally frowned upon and hence SSDT static code analysis will look for occurrences of this and flag them. So, the next thing we need to do is turn on static code analysis in the project properties: A subsequent build causes a code analysis warning as we might expect: Let’s suppose we actually don’t mind stored procedures with sp_ prefixes, we can just right-click on the message to suppress and get rid of it: That causes a suppression file to get created in our project: Notice that the suppression file contains a relative path to the file that has had the suppression placed upon it. Now if we simply move the file within our project to a new folder notice that the suppression that we just created gets removed from the suppression file: As I alluded above this behaviour is intuitive because the path originally stored in the suppression file is no longer relevant but you’re probably not going to be aware of it until it happens to you and messages that you thought you had suppressed start appearing again. Definitely one to be aware of. @Jamiet   

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• Performance issues with visibility detection and object transparency

  - by maul

  I'm working on a 3d game that has a view similar to classic isometric games (diablo, etc.). One of the things I'm trying to implement is the effect of turning walls transparent when the player walks behind them. By itself this is not a huge issue, but I'm having trouble determining which walls should be transparent exactly. I can't use a circle or square mask. There are a lot of cases where the wall piece at the same (relative) position has different visibility depending on the surrounding area. With the help of a friend I came up with this algorithm: Create a grid around the player that contains a lot of "visibility points" (my game is semi tile-based so I create one point for every tile on the grid) - the size of the square's side is close to the radius where I make objects transparent. I found 6x6 to be a good value, so that's 36 visibility points total. For every visibility point on the grid, check if that point is in the player's line of sight. For every visibility point that is in the LOS, cast a ray from the camera to that point and mark all objects the ray hits as transparent. This algorithm works - not perfectly, but only requires some tuning - however this is very slow. As you can see, it requries 36 ray casts minimum, but most of the time 60-70 depending on the position. That's simply too much for the CPU. Is there a better way to do this? I'm using Unity 3D but I'm not looking for an engine-specific solution.

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• How to use shared_ptr for COM interface pointers

  - by Seefer

  I've been reading about various usage advice relating to the new c++ standard smart pointers unique_ptr, shared_ptr and weak_ptr and generally 'grok' what they are about when I'm writing my own code that declares and consumes them. However, all the discussions I've read seem restricted to this simple usage situation where the programmer is using smart in his/her own code, with no real discussion on techniques when having to work with libraries that expect raw pointers or other types of 'smart pointers' such as COM interface pointers. Specifically I'm learning my way through C++ by attempting to get a standard Win32 real-time game loop up and running that uses Direct2D & DirectWrite to render text to the display showing frames per second. My first task with Direct2D is in creating a Direct2D Factory object with the following code from the Direct2D examples on MSDN: ID2D1Factory* pD2DFactory = nullptr; HRESULT hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory); pD2DFactory is obviously an 'out' parameter and it's here where I become uncertain how to make use of smart pointers in this context, if indeed it's possible. My inexperienced C++ mind tells me I have two problems: With pD2DFactory being a COM interface pointer type, how would smart_ptr work with the Add() / Release() member functions for a COM object instance? Are smart pointers able to be passed to functions in situations where the function is using an 'out' pointer parameter technique? I did experiment with the alternative of using _com_ptr_t in the comip.h header file to help with pointer lifetime management and declared the pD2DFactory pointer with the following code: _com_ptr_t<_com_IIID<pD2DFactory, &__uuidof(pD2DFactory)>> pD2DFactory = nullptr; and it appears to work so far but, as you can see, the syntax is cumbersome :) So, I was wondering if any C++ gurus here could confirm whether smart pointers are able to help in cases like this and provide examples of usage, or point me to more in-depth discussions of smart pointer usage when needing to work with other code libraries that know nothing of them. Or is it simply a case of my trying to use the wrong tool for the job? :)

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• IIM Calcutta &ndash; EPBM 14 &ndash; Campus Visit &ndash; Day 1 &ndash; Registration &amp; Beginning

  - by Ram Shankar Yadav

  Hey Guys! I’m back with the updates, it was an awesome Monday morning, for me it started when Sun came on my face, and the time was 5:30AM~~ I was amazed that this part of the country gets the sunrise quite early, but I ignored the sunlight for a while by covering my face, but…finally the door knocked….~ It was Mukesh, and the time was 6 AM, so I thought let’s get rid of laziness and start my day~ After having my brush and bath, I shaved and we headed for the Breakfast~ We quickly had our bread butter jam combo, and left for the Auditorium for Registration~ We searched for our names and signed the Registration paper and got a cool IIM C bag, with following in it: - a IIMC Notepad - Cello X Caliber pen - a book “What the Best MBAs Know”, and - Reading Material for Campus Sessions Today we had lectures on “Evolution of Indian Corporate Sector” (2 Session of 1.5 hrs each) and “Indian Economy: Crisis & Response” (2 Sessions of 1.5 hrs). “Evolution of Indian Corporate Sector” was by Prof. Raghabendra Chattopadhyay, was one of my best lectures I’ve ever attended in my life, he started with a question that saying that “The Indian Capitalists didn’t wanted the economy to open up till the economic reforms occurred?”, he is one of the best story tellers I’ve ever met, he started with the ancient European and Indian history and linked the trade & economics with it, simply amazing~ I can’t believe I didn’t get bore even after a 2hour long session…awesome~~ Afterward we had our lunch break, we did our lunch in “New Hostel” building and got back for “Indian Economy” sessions. Indian Economy session was taken by Sudip Chaudhuri, for us he’s a well known face as we have already attended his sessions on Macroeconomics~ It was an interactive, easy going, and a laughable session, and we did discussed some serious issues as well. After the class got over we went out and got few T-Shirts and Mugs for ourselves, and yep not to forget it “Rained” in Kolkata today~~ We got back and had our dinner and dispersed finally… I loved this amazing Monday, and hope the spirit continues till Saturday~ I’m feeling the enrichment in my thought and perceptions~ I’m lovin’ it~~ ram :)

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• Is there a canonical book for learning Java as an experienced developer?

  - by Steven Elliott Jr

  I have been a .NET developer now for about the past 5/6 years give or take. I have never done any professional Java development and the last time I really touched it was probably back in college. I have been toying with the Scala language a little bit but nothing serious. Recently, I've been offered an opportunity to do some pretty cool work, but using Java instead of .NET. I think I can get by alright with my current skill set, meaning I already know how to program well and am familiar with languages such as C# and C++, etc. So, the syntax and all that language stuff are really not a problem. What I need is a really good reference book and a book about how to think in Java. Each language/Framework/Stack tries to address things a certain way and I'm sure Java is no different. What are some great Java books that you simply can't live without? Are there any books that talk about the most important parts of Java that must be understood before all else? As a side note, I will be doing mostly Java web development. Not really 100% on what types of stuff they are using for persistence, framework, server, etc.

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• Hybrid Graphics on Windows 7/Ubuntu 12.04 Dual Boot

  - by Noob.

  Alright, so here's the situation: I am using an ASUS UL80VT with two graphics cards: Integrated intel graphics and NVIDIA G210M I was running an Ubuntu 12.04 - Windows 7 dual boot (on separate partitions).The machine worked perfectly (including the display drivers) without me needing to install anything special or change any settings. However, my hard drive was corrupted and I lost all my data yesterday, so after it was replaced, I installed Ubuntu 12.04 64x again after installing Windows 7. I booted up Ubuntu after installation, and noticed it was by default using Unity 2D... Gnome 3.4 wasn't working properly either, so I guessed that the NVIDIA G210M driver wasn't installed/working and the OS was instead using the integrated graphics. I checked the "Additional Drivers" thing, but there were no proprietary drivers listed there, so I went to the NVIDIA website, downloaded the driver directly and installed it. I restarted, but there was no change. After this, I read somewhere that I should change my SATA in the BIOS to "Compatible" rather than "Enhanced". This worked fine and fixed the problem (both Unity and Gnome were working perfectly) but then when I tried booting up Windows 7, I recieved the BSOD. So I changed it back to Enhanced, and once again, the NVIDIA 210M graphics isn't working on Ubuntu, but on Windows 7 it is. I do not want to keep changing from Enhanced to Compatible every time I reboot to Ubuntu and neither do I want to simply just use one OS. Note that NVIDIA 210M and integrated graphics work perfectly on Windows 7. Also, I don't care about switching between them, I just want to be able to use the NVIDIA one. What can I do so that both Windows 7 and Ubuntu work and NVIDIA G210M works on Ubuntu?

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• Is it wise to ask about design decisions made on a product during an interview?

  - by Desolate Planet

  I've been thinking about interview questions lately and I've been reflecting on bad interview experiences I've had in the past. One of particular note is where I had asked the interviewer why the team chose to use Spring over EJB3 in their product. The interviewer pretty much tore my face off, yelling "Because Spring is not the be all and end all of Java software development, do you want this job or not?". In response to this, I told him that this probably wasn't the job for me and I walked out the interview. He told me at the start of the interview that they had high stuff turnover, the product had gone from Modula 3 to Perl to Java then after asking him a technical question, he went in flames. It seemed obvious to me that he was toxic to the company with that kind of attitude. Question: Is it a good idea to probe on architectural choices taken in an interview? If not, why? From my own point of view, an interview is a two-way process. If the interviewers are testing me on my technical skills, I've got every right to ask them the same questions to 1) Figure out what their mindset and attitudes towards developing software solutions are and 2) To figure out if there are in line with how I would approach problems of that kind. It's very possible that the interviewer who got angry was a bad interviewer and forgot that an interview is a two-way process. If I was asked this, I would have simply said something along the lines of wanting to leverage the container more, but I certainly wouldn't have tried to put him in a state of meek capitulation. The interviewer in question was the lead developer in the team.

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• Early Z culling - Ogre

  - by teodron

  This question is concerned with how one can enable this "pixel filter" to work within an Ogre based app. Simply put, one can write two passes, the first without writing any colour values to the frame buffer lighting off colour_write off shading flat The second pass is the one that employs heavy pixel shader computations, hence it would be really nice to get rid of those hidden surface patches and not process them pixel-wise. This approach works, except for one thing: objects with alpha, such as billboard trees suffer in a peculiar way - from one side, they seem to capture the sky/background within their alpha region and ignore other trees/houses behind them, while viewed from the other side, they exhibit the desired behavior. To tackle the issue, I thought I could write a custom vertex shader in the first pass and offset the projected Z component of the vertex a little further away from its actual position, so that in the second pass there is a need to recompute correctly the pixels of the objects closest to the camera. This doesn't work at all, all surfaces are processed in the pixel shader and there is no performance gain. So, if anyone has done a similar trick with Ogre and alpha objects, kindly please help.

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• What is an elegant way to install non-repository software in 12.04?

  - by Tomas

  Perhaps I missed something when Canonical removed the "Create launcher" option from the right click menu, because I've really been missing that little guy. For me, it was the preferred way to install software that comes not in a .deb, but in a tar.gz, for example. (Note: in that tar.gz I have a folder with the compiled files, I'm NOT compiling from source) I just downloaded the new Eclipse IDE and extracted the tar.gz to my /usr folder. Now, I'd like to add it to my desktop and dash so it can be started easily. Intuitively I would right click the desktop and create a launcher. After this I'd copy the .desktop to /usr/share/applications. However, creating a launcher is not possible. My question: How would you install an already compiled tar.gz that you have downloaded from the internet? Below are a few things I've seen, but these are all more time-consuming than the right click option. If you have any better ideas, please let me know. Thanks! Manual copy & create a .desktop file: manually Simply extract the archive to /usr. Create a new text file, adding something along the lines of the code block below: [Desktop Entry] Version=1.0 Type=Application Terminal=false Exec="/usr/local/eclipse42/eclipse" Name="Eclipse 4.2" Icon=/home/tomas/icons/eclipse.svg Rename this file to eclipse42.desktop and make it executable. Then copy this to /usr/share/applications. Manually copy & create a .desktop file: GUI fossfreedom has elaborated on this in How can I create launchers on my desktop? Basically it involves the command: gnome-desktop-item-edit --create-new ~/Desktop After creating the launcher, copy it to /usr/share/applications.

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• Convenience of mySQL over xml

  - by Bonechilla

  Currently I use XML to store specific information to correctly load a few things such as a list of specfied characters, scenes and music, Once more I use JAXB in combination with standard compression/decompression(ZIP) functionality to store a list of extrenous data. This data is called to add functionality to the character, somewhat like Skills in an RPG. Each skill is seperated into its own XML file with a grandlist which contains the names of each file with their extensions omitted and zipped in folder that gets encrypted. At first using xml was working fine however as the skill list grow i worry about its stability. I was wondering if I should begin storing the data in mySQL. Originally I planned to simply convert everything to JSON over xml but i think possibly mySQL would be a better move. Can anyone inform me of the key difference and pros and cons of each I guess i'm looking for the best way to store the data more conviently and would be easier to operate on. The data is mostly primatives and strings and the only arraylist of values i have i can just concat into a single field and parse later Edit: If I am going in the right direction with XML would it make sense to convert it to JSON and use maybe Kyro or EclipseLink JAXB (MOXy)

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• Is it just me or is this a baffling tech interview question

  - by Matthew Patrick Cashatt

  Background I was just asked in a tech interview to write an algorithm to traverse an "object" (notice the quotes) where A is equal to B and B is equal to C and A is equal to C. That's it. That is all the information I was given. I asked the interviewer what the goal was but apparently there wasn't one, just "traverse" the "object". I don't know about anyone else, but this seems like a silly question to me. I asked again, "am I searching for a value?". Nope. Just "traverse" it. Why would I ever want to endlessly loop through this "object"?? To melt my processor maybe?? The answer according to the interviewer was that I should have written a recursive function. OK, so why not simply ask me to write a recursive function? And who would write a recursive function that never ends? My question: Is this a valid question to the rest of you and, if so, can you provide a hint as to what I might be missing? Perhaps I am thinking too hard about solving real world problems. I have been successfully coding for a long time but this tech interview process makes me feel like I don't know anything. Final Answer: CLOWN TRAVERSAL!!! (See @Matt's answer below) Thanks! Matt

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• I can't install Ubuntu on my Dell Inspiron 15R at all

  - by Kieran Rimmer

  I'm attempting to install Ubuntu 12.04LTS, 64 bit onto a Dell Inspiron 15R laptop. I've shrunk down one of the windows partitions and even used gparted to format the vacant space as ext4. However, the install disk simply does not present any options when it comes to the partitioning step. What I get is a non-responsive blank table As well as the above, I've changed the BIOS settings so that USB emulation is disabled (as per Can't install on Dell Inspiron 15R), and changed the SATA Operation setting to all three possible options. Anyway, the install CD will bring up the trial version of ubuntu, and if I open terminal and type sudo fdisk -l, I get this: Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0xb4fd9215 Device Boot Start End Blocks Id System /dev/sda1 63 80324 40131 de Dell Utility Partition 1 does not start on physical sector boundary. /dev/sda2 * 81920 29044735 14481408 7 HPFS/NTFS/exFAT /dev/sda3 29044736 1005142015 488048640 7 HPFS/NTFS/exFAT /dev/sda4 1005154920 1953520064 474182572+ 83 Linux Disk /dev/sdb: 32.0 GB, 32017047552 bytes 255 heads, 63 sectors/track, 3892 cylinders, total 62533296 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xb4fd923d Device Boot Start End Blocks Id System /dev/sdb1 2048 16775167 8386560 84 OS/2 hidden C: drive If I type 'sudo parted -l', I get: Model: ATA WDC WD10JPVT-75A (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/4096B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 41.1MB 41.1MB primary fat16 diag 2 41.9MB 14.9GB 14.8GB primary ntfs boot 3 14.9GB 515GB 500GB primary ntfs 4 515GB 1000GB 486GB primary ext4 Model: ATA SAMSUNG SSD PM83 (scsi) Disk /dev/sdb: 32.0GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 8589MB 8588MB primary Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only. Error: Can't have a partition outside the disk! I've also tried a Kubuntu 12.04 and Linuxmint install disks, wityh the same problem. I'm completely lost here. Cheers, Kieran

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• How to Fix this specific Google "Fetch as Googlebot" error appearing on my Webmaster Tools?

  - by UXdesigner

  Good day, I'm currently finding out why I have lost all of my website's rank in google. I don't even appear in google results by the domain. But other sites do link me and they appear in the google results. I think it's all about leaving my site two months alone and finding out I had 20k in comment spam, which I completely deleted and fixed with filters and adding a new Disqus comment service. Thing is, I added my site to Google Webmaster Tools and I'm finding out several awful things. For example, when I click in Google Fetch As GoogleBot. I receive this error message below in response to my request. And I don't even know what's the real problem and how to fix it. I simply don't get it. This is what appears: Date: Wednesday, July 20, 2011 9:43:35 AM PDT Googlebot Type: Web Download Time (in milliseconds): 55 HTTP/1.1 403 Forbidden Date: Wed, 20 Jul 2011 16:43:36 GMT Server: Apache Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 248 Keep-Alive: timeout=2, max=100 Connection: Keep-Alive Content-Type: text/html; charset=iso-8859-1 403 Forbidden Forbidden You don't have permission to access / on this server. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request. Do you guys know anything about this problem ? I need to have Google crawl my site again. I used to have a really nice google result in the past three years. Now, there's nothing. thanks,

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• Ubuntu not shutting down ( going to black screen ) 12.04

  - by Orrin Fox

  I am currently using a USB persistent install of ubuntu. its a simple 4GB drive with a 2.8GB partition ( casper-rw storage partition ). I setup an administrator account and set it to login automatically. I also removed ubiquity to simply use this as a go anywhere install. Heres my issue. Im logged in as my account, and I click the top right gear and select "shut down". Text pops up showing its quitting processes.. etc. and then goes to the plymouth animation. But... The screen goes black, and then it goes to the login screen. Now when im at the login screen i go into terminal ( alt+F2 ) and dont you know, im logged in as Ubuntu. so then I try the following: ubuntu@ubuntu:~$ sudo shutdown now It goes to the plymouth screen again as if its shutting down, AND the screen goes black once again but the computer has not turned off, as in the usb is still flashing the light, the fans are still on, the only thing off is the screen. Is this a bug? If not maybe i did something wrong? Perhaps its that I made an account but... if there is a work around for this please let me know. Thanks again, Fox

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• Create Shortened goo.gl URLs in Your Favorite Browser

  - by Asian Angel

  Now that the new goo.gl URL shortening service has been active for a bit you may be wanting to add it to your favorite non Internet Explorer/Firefox browser. See how easy it is to enjoy that goo.gl URL shortening goodness with the “goo.gl with prompt for copying Bookmarklet”. goo.gl with Prompt for Copying Bookmarklet In Action To add the bookmarklet to your browser simply drag it to your “Bookmarks Toolbar” and get ready to start creating those shortened URLs. For our example we chose one of the wonderful malware removal articles here at the site. All that you will need to do is click on the bookmarklet to create your shortened URL. The wonderful thing about this bookmarklet is the small pop-up window that provides an easy way for you to copy the shortened URL. You can see the “Context Menu” for the small window here…definitely nice. Once you have copied your new URL you can close the window by clicking on “OK” or pressing “Enter”. Now you are ready to use your new shortened goo.gl URL wherever you like or need to. Conclusion If you have been wanting to add goo.gl URL shortening power to your favorite browser then this is the perfect bookmarklet to have. Links Add the goo.gl with Prompt for Copying Bookmarklet to Your Favorite Browser Similar Articles Productive Geek Tips See Where Shortened URLs “Link To” in Your Favorite BrowserVerify the Destinations of Shortened URLs the Easy WayA Quick Look at URL Shortening Services & ExtensionsCreate Shortened goo.gl URLs in Google Chrome the Easy WayText-Only URL Quick-Fix for Firefox TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Open Multiple Links At One Go NachoFoto Searches Images in Real-time Office 2010 Product Guides Google Maps Place marks – Pizza, Guns or Strip Clubs Monitor Applications With Kiwi LocPDF is a Visual PDF Search Tool

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• Rendering large and high poly meshes

  - by Aurus

  Consider an huge terrain that has a lot polygons, to render this terrain I thought of following techniques: Using height-map instead of raw meshes: Yes, but I want to create a lot of caves and stuff that simply wont work with height-maps. Using voxels: Yes, but I think that this would be to much since I don't even want to support changing terrain.. Split into multiple chunks and do some sort of LOD with the mesh: Yes, but how would I do that? Tessellation usually creates more detail not less. Precompute the same mesh in lower poly version (like Mudbox does) and depending on the distance it renders one of these meshes: Graphic memory is limited and uploading only the chunks won't solve that problem since the traffic would be too high. IMO the last one sounds really good, but imagine the following process: Upload and render the chunks depending on the current player position. [No problem] Player will walk straight forward Now we maybe have to change on of the low poly chunk with the high poly one So, Remove the low poly chunk and load the high poly chunk [Already to much traffic here, I think] I am not very experienced in graphic programming and maybe the upper process is totally okay but somehow I think it is too much. And how about the disk space it would require.. I think 3 kind of levels would be fine but isn't that also too much? (I am using OpenGL but I don't think that this is important)

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