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  • Why do you need float/double?

    - by acidzombie24
    I was watching http://www.joelonsoftware.com/items/2011/06/27.html and laughed at Jon Skeet joke about 0.3 not being 0.3. I personally never had problems with floats/decimals/doubles but then I remember I learned 6502 very early and never needed floats in most of my programs. The only time I used it was for graphics and math where inaccurate numbers were ok and the output was for the screen and not to be stored (in a db, file) or dependent on. My question is, where are places were you typically use floats/decimals/double? So I know to watch out for these gotchas. With money I use longs and store values by the cent, for speed of an object in a game I add ints and divide (or bitshift) the value to know if I need to move a pixel or not. (I made object move in the 6502 days, we had no divide nor floats but had shifts). So I was mostly curious.

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  • #1045 Cannot log in to the MySQL server

    - by user1198291
    I am totally new in linux/ubuntu I am trying to setup lamp on my OS, however I've installed apache , php , mysql by following commands: sudo apt-get install apache2 sudo apt-get install php5 sudo apt-get install libapache2-mod-php5 sudo apt-get install mysql-server libapache2-mod-auth-mysql php5-mysql sudo apt-get install phpmyadmin everything works fine except that i totally cannot log into MySQL(which leads to phpmyadmin failure login) getting the errors : #1045 Cannot log in to the MySQL server Access denied for user 'root'@'localhost' (using password: YES) I googled the problem and also I have tried to reinstall all installed components, but the same result came up! in windows i usually modified the content of mysql configure file but in ubuntu nothing is as same as windows!:) can anybody help me on this, really need to setup lampp :-S thanks in advanced

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  • There is no on button showing in gnome shell extension

    - by Murphy
    How to enable gnome shell extension?. When i click on gnome shell extension there is no ON button showing advanced settings -- shell extensions. In a youtube video I saw there is one ON button to enable shell extensions. i have allready installed gnome tweak tool and everything.. I have want to use user themes for gnome shell, but I am having troubles. I installed the user theme extension, but it doesn't appear to show up under the gnome tweak tool. To confirm that I have the user themes extension installed, here is the feedback I get when I try to install it through terminal again:

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  • Problem with webcam after changing camera input to my iPhone's camera [closed]

    - by andrew
    While trying to use my iPhone as a webcam I changed the paths for the camera input - now I can neither use the built-in webcam nor my iPhone's camera This is the website where I got the information from: http://www.kudanai.com/2010/11/howto-use-your-iphone-as-webcam-in.html I got stuck at the loopback part. I would just like to know how to set the path back to my built-in camera so I can at least use that. Or if there is some way to reset the camera input settings. I'm using an Inspiron 1525 running Ubuntu 12.04 LTS. memory:2.9 GiB Processor:Intel® Core™2 Duo CPU T5750 @ 2.00GHz × 2 OS type: 64-bit

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  • Handling Errors In PHP When Using MVC

    - by James Jeffery
    I've been using Codeigniter a lot recently, but one thing that gets on my nerves is handling errors and displaying them to the user. I've never been good at handling errors without it getting messy. My main concern is when returning errors to the user. Is it good practice to use exceptions and throw/catch exceptions rather than returning 0 or 1 from functions and then using if/else to handle the errors. Thus, making it easier to inform the user about the issue. I tend to go away from exceptions. My Java tutor at university some years ago told me "exceptions shouldn't be used in production code it's more for debugging". I get the feeling he was lying. But, an example, I have code that adds a user to a database. During the process more than 1 thing could go wrong, such as a database issue, a duplicate entry, a server issue, etc. When an issue happens during registration the user needs to know about it. What's the best way to handle errors in PHP, keeping in mind that I'm using an MVC framework.

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  • Graphic Card Installation Failure (NV 9600M GT)

    - by Georg
    I wanted to switch from 7 to Ubuntu. Now, the first thing that holds me back is the installation of the driver for my Nvidia 9600M GT. Ubuntu recommends me 4 drivers from the "Additional Driver" Section. Now, whatever driver I install, there are four things happening RANDOMLY after rebooting: The pc freezes before seeing bootup splash The pc freezes while seeing bootup splash image (ubuntu logo with the 5 dots) The pc gets into login screen and freezes instantly (Thought the unity-bar is transparent now) The pc freezes right after beeing able to login. (While this is happening the unity-bar changes from transparent to ugly-flat-style) I also tried to install the official Nvidia .run file but after exiting the X-Server, it says the driver is not compatible with the kernel and exits installation. Can somebody help me? I really wanna get rid of Windows :( But Ubuntu drives me perfectly insane. Please answer as noobish as possible. I'm an expert Windows user, but Linux is absolutely new to me. My Specs: Ubuntu 11.10 installed from USB Stick (like 100 times now :/ because I dont know how to remove the driver in recovery mode) 9600M GT 4GB Ram Intel Centrino 2 Dual Core 2.26GHz Win 7 and Ubuntu running along side. Thank you in advance, regards.

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  • 2nd instance of Firefox does not obey GTK2 customizations

    - by Cocoro Cara
    Hi On Ubuntu 10.10 I started a 2nd instance of Firefox using the command: $ firefox -ProfileManager -no-remote & Created a new profile and everything works smoothly except for the fact that this instance of FF does not obey by GTK2 customizations that I have placed in ~/.gtkrc-2.0 Moreover, only SOME of the customizations are not obeyed. For example, the vertical scrollbars are supposed to be on the left, but they are on the right. The scrollbar arrows are together (Mac-like) as specified, so is the scrollbar width. The first instance obeys all customizations with scrollbars on the left. Any ideas?

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  • jungledisk fails with libnotify error

    - by Angelo
    Has anyone had success getting the jungledisk application to work under Ubuntu? I installed it from the .deb file provided by jungledisk. The install goes fine, but I can't get the "jungle disk desktop" app to launch. It appears in the dash search bar, but doesn't launch or do anything upon selecting it. When I try the command line, I get the following... $ jungledisk -V -f Verbose mode enabled Shutting down... $ I get something more interesting with the following command ... something about libnotify.so $ junglediskdesktop -V -f junglediskdesktop: error while loading shared libraries: libnotify.so.1: cannot open shared object file: No such file or directory Does anyone have suggestions for what to try?

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  • EVOLUTION: No such Calendar

    - by Dennis
    I am using a google calendar with evolution for quite a while now. I was never having any troubles. Just recently, I suppose just after an update, whenever I want to create a new event in evolution (for the just mentioned google calendar) I get the err message "No such calendar". When I dismiss changes an re-open evolution the entry has been added anyway. This is somewhat annoying. I googled, but haven't found anything yet which suggests that it not problem many people have!? Looking for help, maybe someone here knows an answer! I appreciate any suggestion! Cheers, Dennis

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  • grub-probe: error: cannot find a GRUB drive for /dev/sda1

    - by Thilina
    I'm trying to add windows 7 for my new 12.10 grub bootloader. None of the things worked out; such as .. copying bootx64.efi methods, I'm getting this output: grub-probe --target=fs_uuid /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi grub-probe: error: cannot find a GRUB drive for /dev/sda1. Check your device.map. ....... my device map ....... (hd0) /dev/disk/by-id/ata-WDC_WD6400BPVT-55HXZT3_WD-WXD1EA1MSVR4 ....... 40_custom ..... menuentry "Microsoft Windows x86_64 UEFI-GPT" { insmod part_gpt insmod fat insmod search_fs_uuid insmod chain search --fs-uuid --no-floppy --set=root 80BD-E086 chainloader (${root})/efi/Microsoft/Boot/bootmgfw.efi } When booting to windows 7 give me blank black screen with a cursor blinks for 2 seconds then reboot, I've tried boot-repair too. I think I'm missing Windows UEFI Bootloader files.

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  • How does one handle an incorrect resource file?

    - by AedonEtLIRA
    I'm starting the parser that will handle one of the key features of my app and realizing exactly who easy it would be for me to screw up a resource file that is provided to the application. For example, a simple resource that I provide to my app is a JSON file that contains an entity layout (name, fascia, location etc...). It would be easy for me to leave out the name of the entity or misspell the JSON key. Obviously catastrophic failures during parsing are to be handled in a try/catch, but how would subtle failures (such as a dyslexic spelling of name) be handled?

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  • Release upgrade crashes with "W:Failed to fetch http://host/debian/dists/oneiric/Release.gpg"

    - by Nolan Dillard
    My update manager told me that it has not checked for updates in the past 18 days, so I clicked the "check" button. It works just fine until a certain point where it says "Downloading release". The loading bar moves across the screen for a while on that message, then it just stops and says to check my Internet connection. I am fairly certain that my Internet is fine, as I can do anything else that I have tried, including installing software over the Internet. I clicked on "Details" and this is what turned up: Log

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  • How do I prevent having to log in on 3 separate prompts every time I start my machine?

    - by JC
    Ubuntu 11.04 Natty Narwhal, Ubuntu Classic desktop Each time I start my machine, I have to log in 3 times. I spent a week in IRCFreenode#ubuntu and got nothing but condescension. I've searched on the official Ubuntu fora for similar problems, tried every recommendation, and still get 3 login screens. As a workaround, I have reset login such that I get a login screen at startup, which I'd prefer not to get since this machine is accessible by no one but me, physically. I have gone into System Preferences Passwords and Encryption Keys, set first 'Passwords: default' to 'Default' and unlocked it, and unlocked the 'Passwords: login' key, too. Next, since that changed nothing, I set 'Passwords: login' to 'Default', and checked to make sure it was still unlocked. Again, no change, still get 3 login prompts at startup. I've checked twice to insure that I am the owner of the files; I am. At the suggestion of several people in #ubuntu, I've deleted first one, then the other password key in 'Passwords and Encryption Keys'. Still get 3 login prompts. I changed from the Unity desktop to Ubuntu Classic. While that didn't fix the above problem, it is a much more elegant desktop than Unity, and I'll keep it. From what I've read, this seems to be a Seahorse issue, but beyond that, no one seems to have a solution that works. I'm lost. This shouldn't be this difficult or annoying. I'm trying to help our local Old Time music collective get their machines switched over to Ubuntu in order to save them some money which they can use to promote their DRM-free music. But from what I've seen of Ubuntu so far on my own machine, I can't really recommend that they make this switch. I hope to be proved wrong on that point. But as it stands, if I was out of town or out of country and they ran into a problem, they'd have no way of fixing it as they're all less experienced than even I am. I'm not trying to cast aspersions on Ubuntu or Linux, but it seems pretty clear that KNOWLEDGEABLE, HELPFUL support for Ubuntu is lacking barring any desire on the problem-experiencing-user's part to avoid condescension. Having worked with, and run, several non-profits over the past 20 years, I know that getting volunteers to act professionally can be like herding cats. But an organization's reputation can be denigrated by sarcastic behaviors on the part of those who serve, effectively, as its public face. Thank you all for your help and support. Now...does anyone have a solution to my problem?

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  • Problem installing Oracle 10g Express edition

    - by abhi
    I have installed Oracle 10g Express edition in Ubuntu 10.10 and it doesn't show or ask to give my password during installation. When I click on "start database" it gave the warning "Operation failed, abhi is not a member of 'dba' group." and when clink on "Run SQL command line" it shows /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/nls_lang.sh: 114: [[: not found When I click on "GOTO Database home page", it opens Mozilla's "Ubuntu Google search page". Can anyone help me get my Oracle to work or tell me how to remove that because it is also not getting removed. I tried all the commands that are given as suggestions by Ubuntu. Please help me because I don't want to format my Ubuntu.

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  • Initramfs error during boot

    - by PoohJuice
    Boot from (hd0,0) ext3 238ac8ca-9576-443d-8e23-8dd836cd2683 Starting up ... mount: mounting /dev/disk/by-uuid/238ac8ca-9576-443d-8e23-8dd836cd2683 on /root failed: Invalid argument mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys on /root/sys failed: No such file or directory mount: mounting /proc on /root/proc failed: No such file or directory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg. BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built in shell (ash) Enter 'help' for a list of built-in commands.

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  • Good practice or service for monitoring unhandled application errors for a small organization

    - by palto
    I'm working with multiple software with varying ways of monitoring for errors. When I make software, I usually send email with the stack trace to admins(usually me). Some customer software is monitored by a team who check that a particular batch run was successfull. Other software might not have any monitoring at all(someone will call when things go wrong horribly). Sending emails is good, except when things start going wrong, my mail gets filled fast. Also I don't want to solve the same problem in code for every software. Is there some relatively cheap and low maintenance software or practice to handle this. I want it to be cheap/low maintenance because usually I work alone or in teams of 5 or smaller. For example it would be great if errors would be aggregated so I don't get 10 000 emails when something unexpected happens... For clarification: By unhandled errors I mean Exceptions that were unhandled by application code that were propagated to Tomcat or Jboss. I don't need help with how to catch those errors. I need help with what to do with them. Is there any cloud application that I could send my errors to? Or some simple server to install? Or some library that can handle errors using configuration files. I use Java if that is any help.

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  • 12.04 "Try Ubuntu without installing" results in graphical artifacts on MacBook

    - by ubuntukeks
    I am trying to bless my MacBookPro 5,3 (Unibody/Core2Duo/Nvidia 9400M+Nvidia 9600M GT) with Ubuntu 12.04 (already got rEFIt running), but every time I select Try Ubuntu without installing, it will lock up and always give me the same coloured graphical artifacts all over the screen. Whether I use a CD-ROM or a USB Stick, it does not change a thing. Is there anything else that can be done or am I stuck for now?

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  • How to restore GRUB without re-installing the OS?

    - by Calixte
    A friend of mine has a Packard Bell laptop that came with Windows pre-installed. I installed Ubuntu on it and it works fine, but everytime she tried to boot Windows on it (fortunately rarely) it fails and the computer is unable to boot any OS anymore. Upon boot, the computer stops on a black screen with a GRUB Rescue prompt. Is there any way to restore GRUB without re-installing Ubuntu? (preferably an easy way as I cannot do it for her and she is not extremely computer literate) Also (but less important), is there a way to configure GRUB (or something else) so that Windows won't destroy it on every boot attempt?

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  • Test descriptions/name, say what the test is? or what it means when it fails?

    - by xenoterracide
    The API docs for Test::More::ok is ok($got eq $expected, $test_name); right now in one of my apps I have $test_name print what the test is testing. So for example in one of my tests I have set this to 'filename exists'. What I realized after I got a bug report recently, and realized that the only time I ever see this message is when the test is failing, if the test is failing that means the file doesn't exist. In your opinion, do you think these $test_name's should say what the test means if successful? what it means if it failed? or do you think it should say something else? please explain why?

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  • ERROR with Ubuntu: Cannot open the disk 'D:\My Documents\My Virtual Machines\Ubuntu\Ubuntu-1.vmdk' or one of the snapshot disks it depends on

    - by leiyu
    Cannot open the disk 'D:\My Documents\My Virtual Machines\Ubuntu\Ubuntu-1.vmdk' or one of the snapshot disks it depends on. Reason: The physical disk is already in use. ====================== When I powered on my Ubuntu on VMwave, a window showed up within words above. I tried to remove the old hard disk in settings and created a new one, but it still doesnot work. Also, I tried to delete the .lck files and even the doc. BUT....... Has someone solved this problem? PLEASE do me a favour!!Many thanks!!

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  • what's wrong with my sitemap?

    - by cadrian
    Google Webmaster Tools says that my sitemap is in a wrong format. I don't see my mistake, I think I followed every guideline provided by Google. Can someone help me? <?xml version="1.0" encoding="UTF-8"?> <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"> <url> <loc>http://www.vocalcontraste.fr/</loc> </url> <url> <loc>http://www.vocalcontraste.fr/presentation/</loc> <lastmod>2012-01-30T21:49:06+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/les-concerts/</loc> <lastmod>2012-12-13T21:55:00+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/ecoutez-contraste/</loc> <lastmod>2012-07-13T18:19:45+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/repertoire/</loc> <lastmod>2012-07-13T17:30:14+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/la-presse/</loc> <lastmod>2012-07-11T08:17:48+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/recrutement/</loc> <lastmod>2012-02-01T22:22:03+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/nos-partenaires/</loc> <lastmod>2012-07-11T07:43:31+01:00</lastmod> </url> <url> <loc>http://www.vocalcontraste.fr/contactez-nous/</loc> <lastmod>2012-02-02T19:01:32+01:00</lastmod> </url> </urlset>

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  • Ubuntu 12, chromium/chrome facebook not loading

    - by Grant
    this problem started with chrome, tried chromium to fix it. both have this problem, and after installed firefox no longer works with facebook. I found a threas with two fixes that work and what I need to know is how to make these fixes permanent. one is a cache permissions workaround. launching chromium from terminal with a redirect to a new self created cache in the home folder works. how can i repair the permissions issue with the cache or make a permanent change to the cache chromium uses? two, the ifconfig wlan0 mtu set to 1492, this setting doesnt seem to be perpetual after a reboot. this set of issues is I believe specific to my particular install as there isnt a huge issue from anyone else out there, i'm on a toshiba satellite laptop with a 50/50 HDD partition split with windows. This is likely causing the issue or contributing in some way but I wont run linux full time on this machine until I get these kinks a more permanent fix. Thanks in advance for any advice/answers.

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  • How do I get the Grub menu back after installing Windows on a separate disk?

    - by Shazzner
    Tried sudo grub-install on sda1 but it complained about being a BAD IDEA. I had to install windows for a work related issue so I used a separate disk (I had used it for ubuntu on this computer, but bought a bigger disk so installed ubuntu on that and left the old one in in case I needed an old file). Windows installed fine but overwrote Grub. So if I choose the Ubuntu disk to boot first in BIOS I get a blank screen. I googled and followed this advice: https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows However, when I get down to this section: sudo grub-install --root-directory=/media/0d104aff-ec8c-44c8-b811-92b993823444 /dev/sda1 I get this: Attempting to install GRUB to a partition instead of the MBR. This is a BAD idea… --recheck does nothing. Any ideas?

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  • How to fix "error: unknown file system" on all available partitions

    - by Jonathan
    I've had a running problem with removing Linux from my Windows 7 laptop. Initially, it was installed as a dual-boot, and worked well. To remove, I deleted the partitions on my laptop. This removed grub, and I was left with needing to enter: set root=... set prefix=... insmod normal normal each restart. I didn't restore the Windows boot-loader and have since re-partitioned my drive. Now, upon reaching the command prompt screen, an ls query showshd0, with three partitions, but none of them have a recognizable boot-loader as each returns with error: unknown file system. Booting from a Windows 7 rescue disk doesn't seem to work, as it sends me to the same command prompt terminal. All I'm looking to do is restore the boot-loader, either grub or Windows 7. Any help would be appreciated. Thanks in advance.

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  • 'unknown filesystem' grub rescue prompt; trying to wipe drive and boot 10.10 live

    - by Patrick
    Im currently running Win7, and want to wipe the drive and install 10.10. I have 10.10 loaded on a USB thumbdrive and it sees the device in BIOS but it only reaches a screen saying; Unknown Filesystem grub rescue> Ive read several results from google and a couple here where people are trying to dual boot and i assume save the data on the drive, but i dont care about doing that, and would prefer to just wipe the drive and start fresh. What steps can i take to get the drive to a point where i can load 10.10 live and get it installed?

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