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• Should I keep investing into data structures and algorithms?

  - by 4bu3li

  These days, I'm investing heavily in data structures and algorithms and trying to solve some programming puzzles. I'm trying to code and solve with Java and Clojure. Am I wasting my time? should I invest more in technologies and frameworks that I already know in order to gain deeper knowledge (the ins and the outs) and be able to code with them more quickly? By studying data structures and algorithms, am I going to become a better programmer or those subjects are only important during college years?

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• CUPS - Configuring default printer options

  - by user193661

  I'm using a CUPS printer and trying to set the default options for the printer using /etc/cups/ppd and /etc/cups/printers.conf but I don't see a complete list of available options. Currently I'm trying Option page-top 2 Option page-bottom 2 Option scaling 95 My end goal is getting the printer to stop cutting off the top and bottom page content. I would like to automatically scale the content to fit on the page size being used (default "letter") if possible and if not, resume printing on another page without removing any of the content.

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• Changing $PATH doesn't work?

  - by Ashwini Chaudhary

  I was trying to set PATH in etc/environment file, but after adding the desired path the $PATH is showing an error in terminal: bash: /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games: No such file or directory Here's the content of environment file: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/monty/google_appengine" I was trying to add the path to the folder google_appengine to the PATH as mentioned in this Answer, but it doesn't seem to work.

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• Gosu ruby windows no allocator for Image [on hold]

  - by user2812818

  I am trying to run the Gosu tutorial on Windows XP for ruby 1.93 It quits with `new': allocator undefined for Gosu::Image (TypeError) when trying to initialize a new Image: require 'gosu' require 'rubygems' class GameWindow < Gosu::Window def initialize super(640, 480, false) self.caption = "Gosu Tutorial Game" @background_image = Gosu::Image.new(self, "/media/123.bmp", true) end end I made sure the image is there and is png/bmp. I know it is something simple, maybe to do with the DLL's required? just not sure what.... thanks sgv

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• Software center freezing on start up

  - by user170522

  I already did the apt-get purge, install and update thing but it still freezes when trying to start. This is what I get trying to start in terminal: cliff@cliff-Aspire-X1301:~$ software-center 2013-06-26 17:00:29,092 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None' 2013-06-26 17:00:29,097 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True 2013-06-26 17:00:29,501 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2013-06-26 17:00:29,653 - softwarecenter.ui.gtk3.app - INFO - show_available_packages: search_text is '', app is None. Killed

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• Restrict access to apache2 web root but allow it to subfolders

  - by razor7

  I need to restrict access by password to my web root apache test server (ie http://localhost) but allow access to subfolders (ie: http://localhost/testsite) I did create the .htpasswd and .htaccess, and put the .htaccess to web root (http://localhost) so when trying to access web root, it asks for user and pass, but so does in subfolders (ie: trying to access http://localhost/testite) I want to be asked for password on web root, but not on subfolders. Is that possible?

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• Parsing error when bootstrapping on Windows

  - by Claude Tyler McAdams

  I am trying to get Juju working on Windows 8 but I am running in to some errors when trying to get juju to see my ssh keys: C:\Users\username> juju bootstrap error: error parsing environment "azure": read C:\Users\user\SkyDrive\Documents\Azure\ssh\: The handle is invalid. I've added a public key I generated with putty to the directory above called azure My environments.yaml file has this in it: authorized-keys-path: C:\Users\user\SkyDrive\Documents\Azure\ssh\ Any ideas?

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• DirectX 10 Instancing Problem (objects cannot be seen)

  - by Riffraff

  Right now I'm trying to implement an area that is filled with vegetation. I have tried mesh version and right now I'm trying to implement instancing version but I cannot manage to make it work. I can't see any object. I search for any problem of buffers with FAILED() and D3D10_CREATE_DEVICE_DEBUG but they didn't help me either. Right now I don't even know which part of my code to share to explain my problem.

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• Generate md5 and other checksums from properties menu (added "Digests" tab)

  - by Chuck

  I am trying to restore a function that I had on my last box. It added a tab in the properties menu of any file called "Digests". From there I could choose any/all of the hash formats, click hash and it would generate said checksums right there. What I am trying to find out is either the name of the package or acquire the location of it's installation. I have started a thread on UbuntuForums pertaining to this already

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• RTMPDUMPTV problem

  - by ranavita

  (Reading database ... 459988 files and directories currently installed.) Unpacking librtmp-dev (from .../librtmp-dev_2.4~20110711.gitc28f1bab-1_amd64.deb) ... dpkg: error processing /var/cache/apt/archives/librtmp-dev_2.4~20110711.gitc28f1bab-1_amd64.deb (--unpack): trying to overwrite '/usr/include/librtmp/amf.h', which is also in package rtmpdump 2.5-0ubuntu2~precise Errors were encountered while processing: /var/cache/apt/archives/librtmp-dev_2.4~20110711.gitc28f1bab-1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) above error code results after running sudo apt-get install -f A I am trying to fix the broken package of rtmptv

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• Ubuntu 12.4.1 failing in vm both Vbox and Vmware on new HP Envy 4t-1000

  - by Chas

  Brand new to Linux, getting frustrated trying to get an environment up with Ubuntu. My primary goal is to learn Linux and Apache/PHP development. I need to keep my Windows OS as main on my machine for work, so i'm trying to virtualize Ubuntu 12.4.1 without luck (many attempts). I have a new HP Envy 4t-1000 with 16gb ram, and 32 gb ssd caching with 500gb spindle hard drive. Graphics card is an Intel HD 3000 with AMD Radeon 7670M. With installing Ubuntu desktop in VBox, I'm getting this result: https://forums.virtualbox.org/viewtopic.php?f=6&t=51939 With VMware workstation 7 (patched), I complete the install of Ubuntu, it reboots, purple desktop briefly flashes then it drops to command line. I bought a beginning Ubuntu book, and it recommends trying to manually configure graphics if this happens. So I tried doing a safe boot holding shift - I get to the first screen (GRUB) loads fine, and I choose recovery mode. After choosing the recovery mode, I get the recovery mode options, and can arrow down to what the book suggests 'Run in fail safe graphic mode.' Once I select this option, I get a black screen with a large white dialogue box, at the top it says "The system is running in low-graphics mode. Your screen, graphics card, and input device settings could not be detected correctly. You will need to configure these yourself." Then there is an ok button way down at the bottom. When I select 'ok' I get a menu for a few options, book recommended 'reconfigure graphics.' When I try this, I get a menu of two options: 1) "Use generic (default) configuration or 2) use backup. I've tried both options several times, hitting ok just refreshes screen and nothing more. Rebooting at this point just goes back to command line as before. I don't know what to do at this point, I've spent too many hours this weekend trying in both VBox and VMware to get Ubuntu going. Isn't there like a very basic graphic display or something I can use to at least get into the desktop? I explored the GRUB some more, and tried to look at the startup and xserver logs - both are blank. No help there I guess? When I try to choose 'Edit the configuration file, then 'ok' screen just refreshes on same menu options, nothing happens. thx for any advice. I really need to focus on learning Linux, Apache and PHP, so perhaps Ubuntu just won't work on my hardware? Any other suggestions? I will need to virtualize - THANKS for any help/advice.

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• FTP Logon Restrictions in IIS 8

  - by The Official Microsoft IIS Site

  One of the biggest asks from our customers over the years was to provide a way to prevent brute-force password attacks on the FTP service. On several of the FTP sites that I host, I used to see a large number of fraudulent logon requests from hackers that were trying to guess a username/password combination. My first step in trying to prevent these kinds of attacks, like most good administrators, was to implement strong password requirements and password lockout policies. This was a good first step...(read more)

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• {12.04} cannot open software center or use apt-get install

  - by d6braun

  i have been trying to get it working for over an hour and a half now, the code below is what i keep getting. the example is from me trying to install synaptic, but i get the errors on most apt-get commands and update manager. sudo apt-get install synaptic Reading package lists... Error! E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/wine.budgetdedicated.com_apt_dists_edgy_main_binary-i386_Packages E: The package lists or status file could not be parsed or opened.

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• Else statement to show connection successful [closed]

  - by Craig Smith

  I am trying to write a script to test a database connection, at the moment it will only display text if the connection doesn't work, I am stuck with trying to create an else statement to display "Connection Successful" if it works. Here's my code so far. Any help appreciated :) <? $conn = @mysql_connect("localhost", "root", ""); if (!$conn) { die("Connection failed: " .mysql_error()); } ?>

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• Calculating a circle or sphere along a vector

  - by Sparky

  Updated this post and the one at Math SE (http://math.stackexchange.com/questions/127866/calculating-a-circle-or-sphere-along-a-vector), hope this makes more sense. I previously posted a question (about half an hour ago) involving computations along line segments, but the question and discussion were really off track and not what I was trying to get at. I am trying to work with an FPS engine I am attempting to build in Java. The problem I am encountering is with hitboxing. I am trying to calculate whether or not a "shot" is valid. I am working with several approaches and any insight would be helpful. I am not a native speaker of English nor skilled in Math so please bear with me. Player position is at P0 = (x0,y0,z0), Enemy is at P1 = (x1,y1,z1). I can of course compute the distance between them easily. The target needs a "hitbox" object, which is basically a square/rectangle/mesh either in front of, in, or behind them. Here are the solutions I am considering: I have ruled this out...doesn't seem practical. [Place a "hitbox" a small distance in front of the target. Then I would be able to find the distance between the player and the hitbox, and the hitbox and the target. It is my understanding that you can compute a circle with this information, and I could simply consider any shot within that circle a "hit". However this seems not to be an optimal solution, because it requires you to perform a lot of calculations and is not fully accurate.] Input, please! Place the hitbox "in" the player. This seems like the better solution. In this case what I need is a way to calculate a circle along the vector, at whatever position I wish (in this case, the distance between the two objects). Then I can pick some radius that encompasses the whole player, and count anything within this area a "hit". I am open to your suggestions. I'm trying to do this on paper and have no familiarity with game engines. If any software folk out there think I'm doing this the hard way, I'm open to help! Also - Anyone with JOGL/LWJGL experience, please chime in. Is this making sense?

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• Storage device manger regarding NTFS automount at boot time

  - by muneesh

  I am using storage device manager to auto-mount NTFS file system at boot time.But repeatedly, I am trying to uncheck the checkbox listed 'read only mode' in assistant option of storage device manager. I am not able to to auto-mount my NTFS partition in read/write mode. Please suggest a solution regarding this problem? Remember I am repeatedly trying to uncheck read only checkbox but not able to do that!

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• How can I stop my Jitter physics meshes being offset?

  - by ben1066

  I'm developing a C# game engine and have hit a snag trying to add physics. I'm using XNA for graphics and Jitter for physics. I am trying to split the XNA model into it's meshes, then create a ConvexHull for each mesh. I then attempt to combine those into a CompoundObject, this however isn't working and depending upon the model the meshes are offset by different amounts. This is the code I'm currently using and it gives me: Any ideas?

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• C# Drawing On Separate Thread [migrated]

  - by Zaid

  I have a "public static" class called "DrawTest" and inside is a method public static DrawRandomRectangle(Bitmap g) { } I want to call that method and draw bunches of stuff and then update the pictureBox that uses the image on a separate thread. To simplify, I'm not trying to make anything specific I'm just trying to learn how to draw and update an image inside of a picturebox on a separate thread.

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• Using Drupal to build a directory listing? [on hold]

  - by Jim

  I am trying to create a form inside Drupal that will allow me to create a directory similar to this diagram: http://i.imgur.com/EtChBbG.jpg I tried looking into HTML tables but it is too basic for what I'm trying to do. How do I create a directory that can archive data in an alphabetical ordering? It also has to be able to sort by letters and other categories. Does anyone have an idea of how I should go about doing this? Thanks!

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• GA goal match URL regular expression

  - by MotoTribe

  I'm trying to setup a Goal URL with REGEX matching but it's not working. The Url I'm trying to match is: user/12345/edit?registration=1 with "12345" being the userid that changes. user/[0-9]*/edit?registration=1 Should work, but doesn't. When I do an advanced search for pages with RegEx match (in the new GA interface) it shows no results. If I search for "contains" /edit?registration=1 it shows all the Urls. What am I missing?

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• Should I keep investing into data structures and algorithms?

  - by Chiron

  These days, I'm investing heavily in data structures and algorithms and trying to solve some programming puzzles. I'm trying to code and solve with Java and Clojure. Am I wasting my time? should I invest more in technologies and frameworks that I already know in order to gain deeper knowledge (the ins and the outs) and be able to code with them more quickly? By studying data structures and algorithms, am I going to become a better programmer or those subjects are only important during college years?

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• Position sprite at center of screen

  - by Wellie

  I am trying to get a sprite to position itself at the center of the screen but nothing seems to be working for me. I'm trying Viewport viewport = graphics.GraphicsDevice.Viewport; logoPosition = new Vector2((viewport.Width - towerImage.Width) / 2, (viewport.Height - towerImage.Height) / 2); and spriteBatch.Draw(towerImage, centre, null, Color.White, 0, baseOrigin, 1.0f, SpriteEffects.None, 0); This is my first time using XNA and I don't really have a clue what I'm doing.

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• ssh connection error

  - by evaG

  I'm trying to log into a ubuntu desktop. I get the following error message: PTY allocation request failed What does it mean and how to connect to my desktop ? Thanks edit: debug1: Reading configuration data /home/evag/.ssh/config debug1: /home/evag/.ssh/config line 1: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: auto-mux: Trying existing master debug1: mux_client_request_session: master session id: 2 PTY allocation request failed

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• Understanding the Role of Search Engines

  Have you ever thought of trying to rank your website in the search engines as climbing a mountain, constantly trying to reach the top? I know I have, but this would be an inaccurate depiction. Instead, think of the search engines more as an ever-growing tree, branching off into other markets but always needing a well establish root system to hold it in place. This root system is RELEVANCE.

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• yum not working on EC2 Red Hat instance: Cannot retrieve repository metadata

  - by adev3

  For some reason yum has stopped working in my Amazon EC2 instance, located in the EU West sector. There seems to be something wrong with the path of the repo metadata, is this correct? I would be very grateful for any help, as my experience in this field is somewhat limited. Thank you very much. cat /etc/redhat-release: Red Hat Enterprise Linux Server release 6.2 (Santiago) yum repolist: Loaded plugins: amazon-id, rhui-lb, security https://rhui2-cds01.eu-west-1.aws.ce.redhat.com/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. https://rhui2-cds02.eu-west-1.aws.ce.redhat.com/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. repo id repo name status rhui-eu-west-1-client-config-server-6 Red Hat Update Infrastructure 2.0 Client Configuration Server 6 0 rhui-eu-west-1-rhel-server-releases Red Hat Enterprise Linux Server 6 (RPMs) 0 rhui-eu-west-1-rhel-server-releases-optional Red Hat Enterprise Linux Server 6 Optional (RPMs) 0 repolist: 0 yum update: (I needed to remove the base URLs below because of ServerFault's restrictions for new users) Loaded plugins: amazon-id, rhui-lb, security [same as base url 1 above]/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. [same as base url 2 above]/pulp/repos//rhui-client-config/rhel/server/6/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 401" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: rhui-eu-west-1-client-config-server-6. Please verify its path and try again

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