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• Is self learning Computer Science/programming over a college degree worth it? [on hold]

  - by user106576

  I am currently in college and I just want to skip to learning and gaining experience in what I came here to do, but unfortunately the first two years of college is general classes that everyone takes. I have a couple of friends that are also in Computer Science and we were planning on starting a small company/self employment. Would dropping out and gaining experience and a portfolio qualify for smaller companies if I look for a job there? What programs should I learn, and which ones should I learn before others to better understand the programs that are harder?

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• Mysql not starting - innodb not found

  - by Rob Guderian

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

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• How do I accomplish fading texture trails in UDK?

  - by kdshay

  I would like to know how to leave a fading texture/material trail in udk. For example (I'm not sure if there is a special name for this effect): A character may leave footprints that fade after x number of seconds Or, a tank may leave a tracks trail as in Civilization IV. Here is another example of this type of effect. Skip to 1:00 and watch the green slime texture. http://www.youtube.com/watch?v=KdJIauWjE8s How do I accomplish this effect in UDK? Any good tutorials? Thank you.

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• mail server crash

  - by waxx

  i have a mail server running ubuntu 12.04. my server has a main 200gb hdd as the /, and other scsi hdd. as far as i recall, i used the 5 scsi harddrives for different mount points.. 1 hard drive is /swap, 1 hard drive is /usr ...the other is /boot, i cant recall the other 2.. just yesterday, my /usr drive died... and it wont let me boot into the server.. ive tried to skip mounting the /usr with the S option when i go to recovery drive, but the server still wont boot up. i need help badly because the server needs to be up and running ASAP. thank you for all the help.

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• Half the time Linux drop into BusyBox; the rest of the time the boot happens normally

  - by JoBu1324

  I just installed Ubuntu x64 onto a USB3 Drive from a DVD, and half the time it appears to skip the grub menu and boots directly into BusyBox. Since the USB3 drive is an SSD, I ran through the full installation (installing on an ext4 partition, along side a 1GB boot partition at the start of the disk), skipping the swap partition. Part of the time that the Grub Menu does shows, it boots into BusyBox with an error: ALERT! /dev/disk/by-uuid/[uid] does not exist. Dropping to a shell! What could cause such an issue?

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• What is the most complicated data structure you have used in a practical situation?

  - by Fanatic23

  The germ for this question came up from a discussion I was having with couple of fellow developers from the industry. Turns out that in a lot of places project managers are wary about complex data structures, and generally insist on whatever exists out-of-the-box from standard library/packages. The general idea seems to be like use a combination of whats already available unless performance is seriously impeded. This helps keeping the code base simple, which to the non-diplomatic would mean "we have high attrition, and newer ones we hire may not be that good". So no bloom filter or skip-lists or splay trees for you CS junkies. So here's the question (again): Whats the most complicated data structure you did or used in office? Helps get a sense of how good/sophisticated real world software are.

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• Is it possible to test a theory?

  - by user363295

  We are a group of students who are working on a theory in software engineering (talking about the theory takes a lot of time so I just skip that). Implementing the theory is impossible, due to technical limitations, but it can be proven on a paper logically. We've been pushed to do a testing on it, so it can be proved that way too (although we bleieve that's not possible!), now: Basically, is it possible to test something like this? If it is, what type of testing should we use? I heard,its possible to handout a brief about it to some experts and asking about their opinion (not sure if that's true), is that a testing method? if it is, what does it called? and how exactly can be done?

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• This November, Join Me in Stockholm and Amsterdam

  - by Adam Machanic

  Late last year, I was invited by Raoul Illyés, a SQL Server MVP from Denmark, to present a precon at the 2013 edition of SQLRally Nordic. I agreed and decided to skip the US PASS Summit this year and instead visit an area of Europe I've never seen before. A bonus came a while later when I learned that there is another SQLRally in Europe that same week: SQLRally Amsterdam. Things worked out in just the right way and today I'm happy to announce that I'll be speaking at both events, back-to-back. Should...(read more)

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• Should I use float, double, or decimal for stats, position, etc?

  - by Ryan Peschel

  The problem with float and double is that they are not exact. If you are to do something like store replays, the values would have to be exact. The problems with decimal is that they are approximately 16x slower (confirmed by searching and personal testing) than floats and doubles. Couldn't Vector2s be another problem because they use floats internally for all the components? How do other games solve this problem? I'm sure they must use floats and doubles but aren't they not deterministic across platforms and different architecture? The replay files for games like SC2 run in a linear fashion so you cannot skip ahead so how do they solve the determinism issue with floating point numbers?

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• How to start gkrellm so that it shows up on all virtual desktops?

  - by Jonik

  I'd like to open the GKrellM system monitor so that it is present on all virtual desktops. How to do that? Using Ubuntu 11.04 (Natty) & classic GNOME (not Unity). Bonus questions: How to skip the gkrellm window from the taskbar (on the bottom of the screen)? How to launch it automatically when logging in? (I can ask those separately, too. Or please point out if some of these are already covered.)

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• Continue with Java for pc or go to android? [on hold]

  - by Chris London

  so I have been learning java from Deitel's learn java 9th edition. I am up to GUI's and a have a pretty good grasp on OOP etc. I want to go straight to the mobile app development scene, I believe I will learn a fair bit there on using API's, and other tools to develop apps. I am not sure weather I should carry on with PC coding (GUI's etc etc) or skip it all and go direct to learning the Android SDK. So, should I carry on, learn about sockets, writing and reading files, GUI's for PC etc or get a book and jump into android? Thanks a lot guys.

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• Detailed Modern Opengl Tutorial?

  - by Kogesho

  I am asking for a specific modern opengl tutorial. I need a tutorial that does not skip to explain any lines of code. It should also include different independent objects moving/rotating (most tutorials use only one object), as well as imported 3d objects and collision detection for them. It should also avoid stuff that won't be used. Arcysnthesis for example gives a new concept, and after teaching it, in the next tutorial, it explains how bad it is for performance and introduces another method. Do you know any?

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• DIY Touch Screen Mod Makes Regular Gloves Smartphone-friendly

  - by Jason Fitzpatrick

  Smartphone-friendly winter gloves are expensive (and often ugly). Skip shelling out for store-bought gloves when, armed with a needle and thread, you can turn any gloves into smartphone-friendly ones. Over at Popular Science, Taylor Kubota shares the simple trick: 1. Order silver-plated nylon thread (silver conducts electricity). This can be difficult to find in stores, but major online retailers carry it. 2. Pick a pair of gloves to modify. Although leather works, it’s harder to push a needle through. 3. Stitch the figure of a star or other solid shape onto the glove’s index finger with the thread, making sure it will contact both the touchscreen and your skin. Our Geek Trivia App for Windows 8 is Now Available Everywhere How To Boot Your Android Phone or Tablet Into Safe Mode HTG Explains: Does Your Android Phone Need an Antivirus?

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• Why does installing Grub2 give an "ISO9660: filesystem destruction..." warning?

  - by Ettore

  I have installed Ubuntu 12.04 on my computer, but at the end of the installation it gave me an error and it didn't install grub2. Now I'm trying to install it using the live cd: This is my sudo fdisk -l: Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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: 0x6af447e6 Device Boot Start End Blocks Id System /dev/sda1 * 2048 781459455 390728704 7 HPFS/NTFS/exFAT /dev/sda2 781459456 789272575 3906560 82 Linux swap / Solaris /dev/sda3 789272576 976773119 93750272 83 Linux After mounting and chroot the linux partiton, I give grub-install /dev/sda command, and I get: /usr/sbin/grub-setup: error: hd0 appears to contain a iso9660 filesystem which isn't known to reserve space for DOS-style boot. Installing GRUB there could result in FILESYSTEM DESTRUCTION if valuable data is overwritten by grub-setup (--skip-fs-probe disables this check, use at your own risk). (same error even with grub-install --recheck /dev/sda) What can I do? I also tried boot-repair, but I get this error: http://paste.ubuntu.com/1069353/

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• How to change the state of a singleton in runtime

  - by user34401

  Consider I am going to write a simple file based logger AppLogger to be used in my apps, ideally it should be a singleton so I can call it via public class AppLogger { public static String file = ".."; public void logToFile() { // Write to file } public static log(String s) { AppLogger.getInstance().logToFile(s); } } And to use it AppLogger::log("This is a log statement"); The problem is, what is the best time I should provide the value of file since it is a just a singleton? Or how to refactor the above code (or skip using singleton) so I can customize the log file path? (Assume I don't need to write to multiple at the same time) p.s. I know I can use library e.g. log4j, but consider it is just a design question, how to refactor the code above?

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• MP3 files downloaded from cloud incomplete/cut off (Android app)

  - by rudefyet

  I noticed today on my phone (Droid X running Android 2.2.1) that when streaming the Ubuntu One app would skip to the next song before the previous one had finished. Looking into it, one of the mp3s downloaded from the server was only 2.5MB instead of 4.2MB as it shows on the server itself via one.ubuntu.com. It's happened with multiple tracks today (I remember it happening once the first time I used the app too but shrugged it off as a glitch). The app itself shows a star on the playlist item indicating the file was downloaded even though it was apparently cut off for some reason, perhaps lack of good cell coverage, or some sort of dropped connection. It seems like the latter may be happening and instead of showing an error or retrying it just stops and shows the download is complete.

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• /etc/crypttab not working

  - by Jeremy Stein

  I used the Disk Utility to create an encrypted volume on an external drive. When I click the Unlock Volume button in that program, it mounts the drive for me. Now, I want to automate this process so that it will happen at boot-up. When I run sudo cryptsetup luksUUID /dev/sdb1, I get this: ca709269-1e3e-4e9e-9e08-7248f0e6c5a6 So, I create /etc/crypttab like this: backup_drive UUID=ca709269-1e3e-4e9e-9e08-7248f0e6c5a6 none And I added this line to /etc/fstab: /dev/mapper/backup_drive /mnt/backup ext3 default 0 2 When I reboot, Ubuntu tells me that the device is not available to map, so I tell it to skip it. It appears that the /etc/crypttab is not getting run correctly. How can I debug this?

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• Upgrade to Precise leaving system unbootable

  - by Talemon

  I've upgraded our server's system from Lucid to Precise and as far as I can tell, it left the system in an un-bootable state. I've read many responses in different threads but my problem has a twist. When we boot the server, it says The disc drive for / is not ready yet or not present Continue to wait; or press S to skip mounting or M for manual recovery but when I press any of those buttons, it doesn't do anything. I can't boot to any recovery console, and as it is a server and I'm accessing it via iDRAC, there's not much I can do.

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• How do I best remove an entity from my game loop when it is dead?

  - by Iain

  Ok so I have a big list of all my entities which I loop through and update. In AS3 I can store this as an Array (dynamic length, untyped), a Vector (typed) or a linked list (not native). At the moment I'm using Array but I plan to change to Vector or linked list if it is faster. Anyway, my question, when an Entity is destroyed, how should I remove it from the list? I could null its position, splice it out or just set a flag on it to say "skip over me, I'm dead." I'm pooling my entities, so an Entity that is dead is quite likely to be alive again at some point. For each type of collection what is my best strategy, and which combination of collection type and removal method will work best?

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• Another Update to SQL Server Configuration Scripting Utility

  - by Bill Graziano

  I’ve been gradually adding features to my utility that scripts the configuration of a SQL Server.  Since my last post I’ve added the following features: Skip any encrypted object in a database Script alerts, alert notifications and operators Script audits Always script model, master and msdb to capture any user-defined objects in those databases Logins are now scripted so that everything for a login is grouped together. There’s a second section in the logins that handles default databases.  In many cases a login’s default database is a mirror target and can’t be set.  This is now handled gracefully.  It also includes a separate section for all default databases so those can be quickly set in the event of a disaster. Script credentials Script proxy accounts Script database mail My goal is still to get everything outside a database scripted.  This release is enough that I can keep my mirror target servers in sync with their principals.

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• Should I use a workflow engine?

  - by Fernando

  I need to add some new features to a PHP application. It is to follow the steps of a order. A process create some orders, the order goes to confirmation, then if approved is sent to a provider, later the provider confirm that can deliver the order, a request is made to the provider and so on... I need to register when every step is made and send notifications. Also, some steps have a estimate time, and if that time is elapsed I need to send notifications so everybody know about the delay. When a process starts, it have a predefined set of steps, but in a middle the user should be able to create new sub-steps, and delete or skip future steps.. Should I use a workflow engine? Which one do you suggests (free-opensource only)?

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• How To Remotely Copy Files Over SSH Without Entering Your Password

  - by YatriTrivedi

  SSH is a life-saver when you need to remotely manage a computer, but did you know you can also upload and download files, too? Using SSH keys, you can skip having to enter passwords and use this for scripts! This process works on Linux and Mac OS, provided that they’re properly configured for SSH access. If you’re using Windows, you can use Cygwin to get Linux-like functionality, and with a little tweaking, SSH will run as well.What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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• Is there a way to continue a partially finished MinGW build?

  - by vsz

  I am just trying to become familiar with MinGW (and with more complex command-line compiler tools) I have a really giant project to build, I successfully managed to generate the makefile with CMake, and started mingw. After more than an hour of hard work, and building dozens of libraries successfully, the build ended in an error. It seems I added an option in CMake which is not supported in my system. My problem is, I cannot figure out a way to just skip that library and continue with the build process. If I remove the option in CMake and start mingw again, it starts from the beginning and rebuilds everything, even those libraries which are already built.

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• Unable to mount Windows (NTFS) filesystem due to hibernation

  - by yotamoo

  Whenever I boot Ubuntu, I get a message that it cannot mount my windows partition, and I can choose to either wait, skip or manually mount. When I try to enter my Windows partition through Nautilus I get a message saying that this partition is hibernated and that I need to enter the file system and properly close it, something I have done with no problem so I don't know why this happens. Here's my partition table, if any more data is needed please let me know. Device Boot Start End Blocks Id System /dev/sda1 2048 20000767 9999360 83 Linux /dev/sda2 20002814 478001151 228999169 5 Extended /dev/sda3 * 478001152 622532607 72265728 7 HPFS/NTFS/exFAT /dev/sda4 622532608 625141759 1304576 82 Linux swap / Solaris /dev/sda5 20002816 478001151 228999168 83 Linux

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• Hibernation option went missing

  - by harisibrahimkv

  In my Ubuntu 12.04, the hibernation option was working well and fine. However, I installed Debian on another partition recently and when I again tried to boot to Ubuntu, I got a message on the boot splash screen saying : The disk drive for / is not ready yet or not present. Continue to wait; or press s to skip mounting or M for manual recovery. After logging into Ubuntu, I find that my hibernation option has gone missing. Is there anyway to recover the hibernation option?

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