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• How to install again Update Manager after uninstalling it

  - by biezdar

  Ok, the thing is this I tried asking many times on few ubuntu forums how to deal with my non-responsive Update Manager, but all I was getting was the same stuff (run it from the terminal, run some lines, apt-get update blah blah). Nothing was helping. Eventually I went mad Windows style and tried to simply uninstall it and install it again. The problem is - how to install it again? Can't do it through Software Center, can't really build a package (because I'm too stupid to do that). And I seriously want to avoid reinstalling the whole system. I am running a 12.04 verison (Update Manager was unable to update to a newer one) Please help. I am furious with this thing.

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• What is the logic behind this C Program?

  - by iamanimesh19

  Here is a small piece of program (14 lines of program) which counts the number of bits set in a number. Input-Output -- 0--0(0000000), 5--2(0000101), 7--3(0000111) int CountBits (unsigned int x) { static unsigned int mask[] = { 0x55555555, 0x33333333, 0x0F0F0F0F, 0x00FF00FF, 0x0000FFFF } ; int i ; int shift ; /* Number of positions to shift to right*/ for (i =0, shift =1; i < 5; i ++, shift *= 2) x = (x & mask[i ])+ ( ( x >> shift) & mask[i]); return x; } Can someone explain the algorithm used here/why this works?

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• Marching squares: Finding multiple contours within one source field?

  - by TravisG

  Principally, this is a follow-up-question to a problem from a few weeks ago, even though this is about the algorithm in general without application to my actual problem. The algorithm basically searches through all lines in the picture, starting from the top left of it, until it finds a pixel that is a border. In pseudo-C++: int start = 0; for(int i=0; i<amount_of_pixels; ++i) { if(pixels[i] == border) { start = i; break; } } When it finds one, it starts the marching squares algorithm and finds the contour to whatever object the pixel belongs to. Let's say I have something like this: Where everything except the color white is a border. And have found the contour points of the first blob: For the general algorithm it's over. It found a contour and has done its job. How can I move on to the other two blobs to find their contours as well?

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• Scan-Line Z-Buffering Dilemma

  - by Belgin

  I have a set of vertices in 3D space, and for each I retain the following information: Its 3D coordinates (x, y, z). A list of pointers to some of the other vertices with which it's connected by edges. Right now, I'm doing perspective projection with the projecting plane being XY and the eye placed somewhere at (0, 0, d), with d < 0. By doing Z-Buffering, I need to find the depth of the point of a polygon (they're all planar) which corresponds to a certain pixel on the screen so I can hide the surfaces that are not visible. My questions are the following: How do I determine to which polygon does a pixel belong to so I could use the formula of the plane which contains the polygon to find the Z-coordinate? Are my data structures correct? Do I need to store something else entirely in order for this to work? I'm just projecting the vertices onto the projection plane and joining them with lines based on the pointer lists.

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• Need the co-ordinates of innerPolygon

  - by user960567

  Let say I have this diagram, Given that i have all the co-ordinates of outer polygon and the distance between inner and outer polygon is d is also given. How to calculate the inner polygon co-ordinates? Edit: I was able to solved the issue by getting the mid-points of all lines. From these mid-points I can move d distance, So I can get three points. No I have 3 points and 3 slopes. From this, I can get three new equations. Simultaneously, solving the equation get the 3 points.

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• How do you write straight to the point documentation without looking sloppy and informal?

  - by James

  I'm currently at a contract position and am looking to add to the documentation of the projects I worked on, to assist the next hiree taking over my projects. The documentation I received was overly technical (i.e. references code right away, references replacing certain values on certain lines, no high level description at all) How do I write documentation in simple plain English that is of actual benefit without looking sloppy? I find it difficult in areas such as outlining a system's flaws without coming off as judgmental, but still emphasize the severity of how detrimental some of the flaws are.

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• How to automate mysql backups?

  - by Patrick

  hi, I want to automatize the backup of my databases and files with cron. Should I add the following lines to crontab ? mysqldump -u root -pPASSWORD database_name | gzip > /home/backup/database_`date +\%m-\%d-\%Y`.sql.gz svn commit -m "Committing the working copy containing the database dump" 1) First of all, is this a good approach? 2) It is not clear how to specify the repository and the working copy with svn. 3) How can I run svn only when the mysqldump is done and not before ? Avoiding conflicts Any other tip ? thanks

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• i have xp partitioned and formatted fat32 it says it needs to be bootable to install ubuntu how do i do that? [duplicate]

  - by Rob Bailey

  This question already has an answer here: How do I install Ubuntu? 4 answers I have partitioned the hard drive and formatted it fat 32 as it is only 16gig. I have just read that I should not partition the hard drive so I have deleted the partition, I noticed that if i re-partition it my options would be NTFS, Fat32 or exfat. I tried to install ubuntu 12.10 but it flashed up something along the lines of the partition is not bootable and it must be for ubuntu to install. I know my copy works as a friend installed it over his copy of windows and it works perfect, I have ubuntu on my flashdrive, I want to run it along side xp.

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• video/audio output via HDMI Ubuntu 12.04

  - by lostNfound

  I've been out of the Ubuntu loop for quite a while now and have a completely new laptop now. Just installed Ubuntu 12.04 64-bit and would like to output my video and my audio via HDMI to my television. the following is the lspci | grep VGA for my computer. please tell me if there is any additional information needed and preferably how to obtain it and i will be more than happy to oblige. thank you in advance for your time and assistance in this matter. 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev a1) Edit: every time i restart my computer, after a short moment, i get an error message stating something along the lines "sorry, jockey needed to close unexpectedly." after researching, i discovered jockey is the name of the "additional drivers," which after initial installation, ubuntu informed me of proprietary drivers available. those are no longer available, and this error continues to occur.

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• Comments in code

  - by DavidMadden

  It is a good practice to leave comments in your code.  Knowing what the hell you were thinking or later intending can be salvation for yourself or the poor soul coming behind you.  Comments can leave clues to why you chose one approach over the other.  Perhaps staged re-engineering dictated that coding practices vary.One thing that should not be left in code as comments is old code.  There are many free tools that left you version your code.  Subversion is a great tool when used with TortoiseSVN.  Leaving commented code scattered all over will cause you to second guess yourself, all distraction to the real code, and is just bad practice.If you have a versioning solution, take time to go back through your code and clean things up.  You may find that you can remove lines and leave real comments that are far more knowledgeable than having to remember why you commented out the old code in the first place.

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• Why isn't garbage collection being activated in my code? [migrated]

  - by Netmoon

  I have a foreach statement in my code, where each iteration calculates huge amounts of data and goes to the next iteration. I run this code, but when I read the log, I see there's a memory leak error. PHP.net says when this happens, using gc_enabled() is a good way to handle this. I've added these lines to last line of the foreach block: echo "Check GC enabled : " . gc_enabled(); echo "Number of affected cycles : " . gc_collect_cycles(); And this is the output: Check GC enabled : 1 Number of affected cycles : 0 Why do cycles exist, but the affected cycles is 0?

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• Should I extract specific functionality into a function and why?

  - by john smith optional

  I have a large method which does 3 tasks, each of them can be extracted into a separate function. If I'll make an additional functions for each of that tasks, will it make my code better or worse and why? Edit: Obviously, it'll make less lines of code in the main function, but there'll be additional function declarations, so my class will have additional methods, which I believe isn't good, because it'll make the class more complex. Edit2: Should I do that before I wrote all the code or should I leave it until everything is done and then extract functions?

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• How can I have a Bluetooth Keyboard Auto-Connect at Startup?

  - by Grant

  I have a bluetooth keyboard for my HTPC. I pair it with my computer via bluetooth, and it works fine. However, when I turn off the keyboard or my computer, it has to connect again (which requires me entering a passcode on the computer and keyboard) when I turn them back on. I've looked through many forums and through that I have found that I'm missing some seemingly vital bluetooth files: /etc/default/bluetooth /etc/init.d/bluetooth /etc/bluetooth/hcid.conf In the instructions that I've found online so far, I must change certain lines in any of these files. I am unable to, since they do not exist. Am I missing a dependency or something? I've also tried installing Blueman but that didn't help at all. I'm running Ubuntu 10.10 (Maverick). Original post: http://ubuntuforums.org/showthread.php?t=1643386&highlight=bluetooth

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• How often do you use google, to answer programming relatated questions? [closed]

  - by Mercfh

  I hope this isn't too subjective, but it is programming related and Im curious. Alot of times I feel.......dumb for lack of a better word when I have to look something up. Alot of times I forget all the specificity of a language and have to look up something like "Doing XXX in C++" for instance, or something along the lines of that. How often do you guys as Programmers both Professionally and On your own have to use google to look up something. Or do most people just kind of remember these things. I guess what Im really asking is, do you often have to use google or other web-search sites to remember how to do what is seemingly "simple" things with languages but you've just forgotten? Please tell me im not the ONLY one.

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• Collision Systems Implementation

  - by hrr4

  Just curious what might be a good way to implement a decent collision system. As a class inherited by a base Entity class? Currently I'm stuck and could just use a couple better ideas than my own. Any help is appreciated! Edit: Sorry, it's 2D Collisioning but honestly, I'm not looking for specific collision methods. I'm looking more about the lines of implementation. Just curious of some of the common methods of how to implement collision systems such as: Should the entire collision system be it's own class? What, if anything, should be inheritable? These are some of my questions. Sorry for the confusion.

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• after upgrade from 10.04 to 10.10, no keyboard, cannot login

  - by avar

  Hello, just did upgrade from kubuntu 10.04 to 10.10.. after all done and reboot, when the login box shows up, my keyboard and laptop pad ( mouse ) dosn't work, (plugged in the usb mouse, it works sometimes) but never keyboard. i went to recovery , the boot hung up when it says : [ 17.704053] EXT4-fs (sda9): mounted filesystem with ordered data mode Begin: Running /scripts/local-bottom ... Done. Done. Begin: Running /scripts/init-bottom ... Done. stuck here. nothing works except ctrl+alt+del i tried booting from livecd and update-grub, also tried booting manually from grub command line, everytime it stuck at lines above .. so it's not grub problem . how to solve this ? if it is important, i have ATI mobility radeon HD 5470 card .

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• Q2 2010 ASP.NET AJAX and MVC roadmaps published

  For those of you who are interested in what is cooking for the next major release of RadControls for ASP.NET AJAX and Telerik Extensions for ASP.NET MVC - here are the roadmaps for both product lines, the ink has not event dried yet :) ASP.NET AJAX suite highlights One new control - TagCloud Major new features for RadScheduler, RadEditor, RadAsyncUpload, RadGrid, RadListView and RadRotator Many enhancements across the entire product line ASP.NET MVC suite highlights 3 new extensions - combobox, editor and window Major new features for RadGrid (hierarchy, edit forms editing, column resizing) To go into further details visit the links below: RadControls for ASP.NET AJAX Q2 2010 roadmap Telerik Extensions for ASP.NET MVC Q2 2010 roadmapDid 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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• About cdn architecture to route way

  - by Tony Lee

  Our web system, use the third-party cdn service. Assume that the user set the local dns with the googledns or opendns to visit our web sites, so cdn service will select the closest cdn proxy node. all right, but in fact the user's actual access position might outside there, cdn service may chose the one furthest away from the user node, so static resource access slower.. At present, my idea is if user local set dns server with googledns, and then first one we get the actual ip address of the user, tracerote to test a best routing lines, set up a cookie in user browser, and then set 302 header for response to jump to the which best cdn node. Whether the user's browser side traceroute tool can provide the best route decision-making ? Because we find that, once the user to set local dns server with the foreign network segment, for example : set dns with 8.8.8.8, so cdn routing will choose the foreign service node.

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• Ubuntu 12.04 LTS - Black Screen at boot After changing Nvidia Driver

  - by nDman

  2 days ego i updated my Ubuntu 12.04 LTS to latest updates but i ignored Grub Updating because I thought it will clear my grub settings (I'm so noob!). After restart every things was right, the Ubuntu started normally and every things was working well except graphic which had problem before update. I had the experimental driver before but I changed it to the current-update version. After restart Ubuntu stock on black screen. I tried to reinstall Nvidia driver from recovery but it not worked. Then i used Update Grub in recovery, it not worked too but i see this line on screen at boot: at this time it stops and keyboard not working, but when I push the power button it shows these lines and it will shutdown. OK finally I made it start with older kernel (3.5.0-28-generic). Now how can I keep this kernel or fix Ubuntu to work with new kernel? Should I reinstall Nvidia driver? Which version should I use?

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• tty1 prompt before lightdm

  - by David Weldon

  After upgrading to 13.10, every time I boot I'm shown a login prompt (tty1) for ~30 seconds before lightdm automatically starts. Everything works fine after that. Any ideas on what I could try to fix/debug this? My /var/log/lightdm/x-0-greeter.log contains lines like the following: ** (at-spi2-registryd:1381): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files ** (at-spi2-registryd:1381): WARNING **: Unable to register client with session manager WARNING: Failed to open sessions directory: Error opening directory '/usr/share/lightdm/sessions': No such file or directory ** Message: PID 1534 (we are 1534) sent signal 15, shutting down... ** (gnome-settings-daemon:1401): WARNING **: Name taken or bus went away - shutting down Searching for these errors results in a variety of bugs filed over the years. Maybe a clean install will fix this.

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• Tool Review: Telerik JustDecompile

  - by Sam Abraham

  In the next few lines, I will be providing a brief review of Telerik’s JustDecompile, a free .Net decompiler and assembly browser. In using Telerik’s 2012 Q3 JustDecompile release, one can see many great features.  First off, I loved the built-in options for loading .Net assemblies automatically using the Open->Load Framework menu option. Other options enable loading assemblies from GAC, XAP URL or locally from disk. The ability to create an “Assembly List” is quiet handy for grouping and saving a “List” of DLLs to load. All loaded assemblies are shown in the left panel of a split-panel screen. Clicking an assembly expands all namespaces within. Drilling further to class level displays the actual source code in the right panel in either IL, C# or Visual Basic. In conclusion, JustDecompile has grown and quickly matured into an indispensible handy tool for us developers. Telerik’s effort in maintaining and updating JustDecompile as well as the company’s commitment to keeping it free is much appreciated and valued.

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• NetBeans "Find Usages" Tool Integrates JSF Expression Language

  - by Geertjan

  I saw this by Adam on Twitter today: Interesting. Let's try it. Here's my method "getCustomerId". I select it, right-click, and choose "Find Usages" (or press Alt-F7): A nice dialog appears: Then click "Find" and, guess what, this is what I see (click to enlarge it): Clearly, as you can see, I'm not only finding the Java controller class where the getter is used, but also the Facelets files, and, within those, the exact lines where the JSF expression language makes use of the getter. This is not a new feature, tried it and got the same result in 7.1.1, but it's really cool to know about nonetheless.

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• Splitting Logic, Data, Layout and "Hacks"

  - by fjdumont

  Sure, we all heard of programming patterns such as MVVM, MVC and such. But that isn't really what I'm looking into as Layout, Data and Logic is already pretty much split up (XML-Layout markup, Database, insert your language of choice here). The platform I am developing for is hard to maintain over the updated versions and older OSes. The project significantly grew up over the last few months and dealing with different platform versions really is a pain. For example simply disabling an user interface control for all existing versions took me around 40 lines of code in the logic layer, wrangling around with invocation, delegation, singletons that provide UI handling and so on. Is there a clean way to keep track of those "hacks" by maybe excluding it into separate classes or even packages? Should I overwrite existing framework code in order to handle my requirements correctly? If so, does that concept have a name?

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• New and Noteworthy Fixed Assets Notes

  - by Oracle_EBS

  A new white paper for Integrating Oracle Inventory Transactions Into Oracle Projects To Generate Asset Lines & Interface Assets To Fixed Assets (Doc ID 1392743.1) A listing of available Oracle E-Business Fixed Assets Diagnostics (Doc ID 1362875.1) Information on the knowledge management enhancements made in My Oracle Support Knowledge Management Version 6.0 Release (Doc ID 1393516.1) The new Period Close Advisor for the Release 12 E-Business Suite (Doc ID 335.1).  What is the Period Close Advisor?  The Period Close Advisor provides guidance on recommended period end procedures for E-Business Release 12.x.  It is intended to be generic and does not relate to a specific organization or industry.  Step by step best practices with tips and troubleshooting references are provided to assist you through each phase.  The EBS R12 Period Close Advisor for Assets data can also be found in a standalone note (Doc ID 1359475.1)

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• Significant number of non-HTTP requests hitting my site

  - by Mark Westling

  I'm seeing a significant number of non-HTTP requests hitting a site I just launched. They show up in the server (nginx) logs as non-ASCII and get rejected (correctly) with a 400 status. Here are some lines from the log: 95.132.198.189 - - [09/Jan/2011:13:53:30 -0500] "œ$A\x10õœ²É9J" 400 173 "-" "-" 79.100.145.126 - - [09/Jan/2011:13:57:42 -0500] "#§i²¸oYi á¹„\x13VJ—x·—œ\x04N \x1DÔvbÛè½\x10§¬\x1E0œ_^¼+\x09ÜÅ\x08DÌÃiJeT€¿æ]œr\x1EëîyIÐ/ßýúê5Ǹ" 400 173 "-" "-" 79.100.145.126 - - [09/Jan/2011:13:58:33 -0500] "¯Ú%ø=Œ›D@\x12¼\x1C†ÄÀe\x015mˆàd˜Û%pÛÿ" 400 173 "-" "-" What should I make of this? Is this some sort of scripted attack? Or could these be correct requests that have somehow been garbled? They're not affecting the performance of the site and I'm not seeing any other signs of attacks (e.g., no strange POSTs) so at this point I'm more curious than afraid.

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