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• Best way to store motion changes to reduce memory

  - by Andrew Simpson

  I am comparing jpeg to jpeg in a constant 'video-stream'. i am using EMGU/OpenCV to compare each pixels at the byte level. There are 3 channels to each image (RGB). I had heard that it is common practice to store only the pixels that have changed between frames as a way of conserving memory space. But, if for instance/example I say EVERY pixel has changed (pls note i am using an exaggerated example to make my point and i would normally discard such large changes) then the resultant bytes saved is 3 times larger than the original jpeg. How can I store such motion changes efficiently? thanks

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• Why Is Another Domain Resolving To My IP Address?

  - by Andrew

  I'm not really sure if this is something that I should worry about... I'm currently renting a dedicated server which is hosting a website I've created. The domain of the website was registered with GoDaddy. After submitting a sitemap to Google several months ago, I've noticed that another domain name is resolving to my IP address. This means that every page on my website is actually accessible from another domain. As far as I can tell, the other domain name is meaningless to me, so I'm not sure if this is something I should worry about or not. Is this a residual DNS record from another site that is probably no longer in use? Is it important from the standpoint of either security or SEO? My website is a .com which will later serve e-commerce purposes. The other domain has a top-level domain of st. It's the first one of those that I've encountered. Many thanks in advance!

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• Converting 3 dimension byte array to a single byte array [on hold]

  - by Andrew Simpson

  I have a 3 dimensional byte array. The 3-d array represents a jpeg image. Each channel/array represents part of the RGB spectrum. I am not interested in retaining black pixels. A black pixel is represented by this atypical arrangement: myarray[0,0,0] =0; myarray[0,0,1] =0; myarray[0,0,2] =0; So, I have flattened this 3d array out to a 1d array by doing this byte[] AFlatArray = new byte[width x height x 3] and then assigning values respective to the coordinate. But like I said I do not want black pixels. So this array has to only contain color pixels with the x,y coordinate. The result I want is to re-represent the image from the i dimension byte array that only contains non-black pixels. How do I do that? It looks like I have to store black pixels as well because of the xy coordinate system. I have tried writing to a binary file but the size of that file is greater than the jpeg file as the jpeg file is compressed. I am using c#.

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• What is a good C or Obj-C framework for manipulating Git Repositories?

  - by Andrew Theken

  What Obj-C/C libraries have you used for manipulating git repos in your Mac apps? I am working on a Mac app that I would like to be able to clone and modify git repos. Using git directly is not an option as it is GPL and I'd like to sell my app commercially without opening the source. I've seen libgit2, which I could link, but I'm not sure how to do that properly, and it doesn't appear to implement any of the things necessary for pushing/pulling repos over the git protocol.

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• Is it possible to make CSS-added text searchable by a browser?

  - by Andrew Stacey

  I run a website that uses CSS pseudo classes to insert text here and there. One of them inserts the value of a CSS counter (whereupon it would require considerable re-engineering of the system to do this without CSS text injection). The specific CSS rule is: .num_defn .theorem_label:after { content: " " counter(definition, decimal); counter-increment: definition; } and this converts "Definition" to "Definition 1" (say). However, the injected text is not searchable by the browser. It doesn't see the 1: if I search for "Definition 1" then it doesn't find it, and if I search for "Definition. Whatever the definition text was" then the browser happily highlights the line except for the inserted 1. So if you imagine the bold text as the highlighting, it would look like: Definition 1 . Whatever the definition text was This is not ideal! People like to refer to definitions by their number and to say "Look at Definition 1 on the page XYZ" (and in contexts where hyperlinks are not available - strange, I know, but it does happen). Thus: Is there any way that I, on the server end, can designate the injected text as "searchable"? If not, is there a simple way at the browser end that this can be enabled?

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• How do I start "Ubuntu classic desktop" (no effects) from the command line

  - by Andrew Stern

  I am able to run sessions over an ssh connection but I rather use the "Ubuntu classic desktop (no effects)" version on Ubuntu 11.04 instead of the new Unity since I don't have 3d support on the laptop I'm using to display the graphical User Interface. How can I startup the older gnome-session without the 3d effects? I tried gnome-session but it seems to be the option with the 3d effects and I want a more stripped down session over my ssh session.

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• Ubuntu 13.10 upgraded from 13.04 issues

  - by Andrew Sadach

  The keyboard stopped working after a while, I started using 13.04 again VIA USB because I am waiting for the keyboard issues that 13.10 has to get an update. 13.04 had tons of issues I didn't care about because most of it worked. Now almost none of it works. There's even a huge amount of graphical errors. Others have had these issues I've noticed while looking at the similar questions area next to this text box, but my question is can I downgrade 13.10 to 13.04?

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• X Error of failed request: BadMatch [migrated]

  - by Andrew Grabko

  I'm trying to execute some "hello world" opengl code: #include <GL/freeglut.h> void displayCall() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_DEPTH_TEST); ... Some more code here glutSwapBuffers(); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowSize(500, 500); glutInitWindowPosition(300, 200); glutInitContextVersion(4, 2); glutInitContextFlags(GLUT_FORWARD_COMPATIBLE); glutCreateWindow("Hello World!"); glutDisplayFunc(displayCall); glutMainLoop(); return 0; } As a result I get: X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 128 (GLX) Minor opcode of failed request: 34 () Serial number of failed request: 39 Current serial number in output stream: 40 Here is the stack trace: fghCreateNewContext() at freeglut_window.c:737 0x7ffff7bbaa81 fgOpenWindow() at freeglut_window.c:878 0x7ffff7bbb2fb fgCreateWindow() at freeglut_structure.c:106 0x7ffff7bb9d86 glutCreateWindow() at freeglut_window.c:1,183 0x7ffff7bbb4f2 main() at AlphaTest.cpp:51 0x4007df Here is the last piece of code, after witch the program crashes: createContextAttribs = (CreateContextAttribsProc) fghGetProcAddress("glXCreateContextAttribsARB" ); if ( createContextAttribs == NULL ) { fgError( "glXCreateContextAttribsARB not found" ); } context = createContextAttribs( dpy, config, share_list, direct, attributes ); "glXCreateContextAttribsARB" address is obtained successfully, but the program crashes on its invocation. If I specify OpenGL version less than 4.2 in "glutInitContextVersion()" program runs without errors. Here is my glxinfo's OpelGL version: OpenGL version string: 4.2.0 NVIDIA 285.05.09 I would be very appreciate any further ideas.

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• Today is my first day in the land of backbone.js

  - by Andrew Siemer - www.andrewsiemer.com

  I am semi-excited to say that today is my first day into the land of backbone.js.  This will of course take me into many other new javascript-y areas.  As I have primarily been focused on building backend systems for the past many years…with no focus on client side bits…this will be all new ground for me.  Very exciting! I am sure that this endeavor will lead to writing about many new findings along the way.  Expect the subject of near future postings to not be related to MVC or server side code. I am starting this journey by reading through the online book “Backbone Fundamentals”.  http://addyosmani.com/blog/backbone-fundamentals/  Has anyone read this yet?  Any feed back on that title. I have read though Derrick Bailey’s thoughts here and here…also very good. Any suggestions on other nuggets of learning backbone?

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• Audio Stutter in in ubuntu 12.04

  - by Andrew Redd

  After upgrading to precise my audio is stuttering. It is happening, in VLC, mplayer, and anything streaming from the internet. I followed the procedures in https://help.ubuntu.com/community/SoundTroubleshootingProcedure but nothing has helped so far. There is the problem that the driver version is out of date but it does not seem to want to update with the given commands. $ bash alsa-info.sh --stdout |grep version Driver version: 1.0.24 Library version: 1.0.25 Utilities version: 1.0.25 How can I upgrade the driver and fix the stuttering?

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• Custom ecommerce solution (similar to newegg.com) price [closed]

  - by Andrew

  I am wondering, how much would it cost me to hire a team of developers who could make improved clone of newegg.com ecommerce solution together with the back end? Please give comments based on your experience and realistic measures. Comments like "hire team of freelancers from India -they will do it for $1,000" are not welcome. I am talking about using realistic, quality and proven developers. Maybe good advise on how to approach ecommerce development? Thank you

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• Where can I get resources to design a website like this? [closed]

  - by Jhon Andrew

  I have a project. To make a CMS for an online game. Can anyone suggest me where I can get resources that I can use like vintage borders, seamless old papers or any vintage like patterns, etc. I would like to come up with something like this website for example: http://www.gamezaion.com/ I hope someone would suggest and/or give me ideas, inspirations, and examples how I can come up to something like it. P.S.: I am getting a hard time designing, because I define my self as a developer not a designer.. Lol.

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• How should I sort images in an isometric game so that they appear in the correct order?

  - by Andrew

  This seems like a rather simple problem but I am having a lot of difficulty with it. What should I do to properly sort images in an isometric game? In a normal 2d top-down game one could use the screen y axis to sort the images. In this example the trees are properly sorted but the isometric walls are not. Example image: sorted by screen y Wall2 is one pixel below wall1 therefore it is drawn after wall1. If I sort by the isometric y axis the walls appear in the correct order but the trees do not. Example image: sorted by isometric y

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• Do PHP-FPM (and other PHP handlers) need execute permissions on the PHP files they're serving?

  - by Andrew Cheong

  I read in a post at Server Fault that PHP-FPM needs execute permissions. However, the answer in When creating a website, what permissions and directory structure? only grants read and write permissions to PHP-FPM. Maybe I don't quite understand how PHP handlers (or CGI in general) work, but the two claims seem contradictory to me. As I understand, when Apache / Nginx gets a request for foobar.php, it "passes" the file to an appropriate handler. That is, I imagine it's as if www-root (or apache or whomever the webserver's running as) were to run some command, /usr/sbin/php-fpm foobar.php Actually, no, that's naive, I just realized. PHP-FPM must be a running instance (if it's to be performant, and cache, etc.), so probably PHP-FPM is just being told, "Hey, quick, process this file for me!" In either case, I don't see why execute permissions are necessary. It's not like the webserver needs to literally execute the file, i.e. ./foobar.php Is the Server Fault answer simply mistaken?

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• How should I sort images in an isometric game so that they appear in the correct order?

  - by Andrew

  Hi! This seems like a rather simple problem but I am having a lot of difficulty with it. What should I do to properly sort images in an isometric game? In a normal 2d top-down game one could use the screen y axis to sort the images. In this example the trees are properly sorted but the isometric walls are not. Example image: sorted by screen y Wall2 is one pixel below wall1 therefore it is drawn after wall1. If I sort by the isometric y axis the walls appear in the correct order but the trees do not. Example image: sorted by isometric y

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• If you had two projects with the same specification and only one was developed using TDD how could you tell?

  - by Andrew

  I was asked this question in an interview and it has been bugging me ever since. You have two projects, both with the same specification but only one of these projects was developed using Test Driven Development. You are given the source for both but with the tests removed from the TDD project. How can you tell which was developed using TDD? All I was able to muster up was something about the classes being more 'broken up' in to smaller chunks and having more visible APIs, not my proudest moment. I would be very interested to hear a good answer to this question.

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• How can I gain access to a player instance in a Minecraft mod?

  - by Andrew Graber

  I'm creating Minecraft mod with a pickaxe that takes away experience when you break a block. The method for taking away experience from a player is addExperience on EntityPlayer, so I need to get an instance of EntityPlayer for the player using my pickaxe when the pickaxe breaks a block, so that I can remove the appropriate amount of experience. My pickaxe class currently looks like this: public class ExperiencePickaxe extends ItemPickaxe { public ExperiencePickaxe(int ItemID, EnumToolMaterial material){ super(ItemID, material); } public boolean onBlockDestroyed(ItemStack par1ItemStack, World par2World, int par3, int par4, int par5, int par6, EntityLiving par7EntityLiving) { if ((double)Block.blocksList[par3].getBlockHardness(par2World, par4, par5, par6) != 0.0D) { EntityPlayer e = new EntityPlayer(); // create an instance e.addExperience(-1); } return true; } } Obviously, I cannot actually create a new EntityPlayer since it is an abstract class. How can I get access to the player using my pickaxe?

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• Are there any specific workflows or design patterns that are commonly used to create large functional programming applications?

  - by Andrew

  I have been exploring Clojure for a while now, although I haven't used it on any nontrivial projects. Basically, I have just been getting comfortable with the syntax and some of the idioms. Coming from an OOP background, with Clojure being the first functional language that I have looked very much into, I'm naturally not as comfortable with the functional way of doing things. That said, are there any specific workflows or design patterns that are common with creating large functional applications? I'd really like to start using functional programming "for real", but I'm afraid that with my current lack of expertise, it would result in an epic fail. The "Gang of Four" is such a standard for OO programmers, but is there anything similar that is more directed at the functional paradigm? Most of the resources that I have found have great programming nuggets, but they don't step back to give a broader, more architectural look.

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• Track sales and commission with third-party tool

  - by Andrew

  I have a clothing website where I link to various clothing retailers. I have reached an agreement with one of the retailers whereby they will pay a commission to us for every sale they make from traffic that was referred by our site. I need a mechanism for tracking how much commission should be paid to us, that involves as little work as possible to implement from their side. We both have Google Analytics. Option 1: They record a goal in their GA account whenever someone makes a purchase on their site. They see how many completed goals are marked as referral traffic from our site and calculate commission accordingly. The problem with this is that the whole process of calculating and paying commission will be manual. They will need to frequently check how many sales were generated by referral traffic from our site, and probably we will have to chase them for commission payments. Also - since we won't have access to their GA data - we will need to trust that they report all sales accurately. Option 2: Sign them up to an affiliate network like Commission Junction or Google's Affiliate Network, and connect to them through this network. The problem with this solution is that it seems too heavyweight; ideally we don't want to ask a retailer to go through the whole sign up process just to deal with us and pay us commission. I am assuming that there must be some lightweight service that tracks the number of sales by one site and pays commission accordingly to the other site, where the sign up and installation procedure is simple and fast.

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• How do I get mlocate to only index certain directories?

  - by Andrew Ferrier

  I'd like to use mlocate on my Ubuntu server, but only to index certain directories (e.g. /home and /data, but not everything under /). However, mlocate's standard configuration works the opposite way; you specify the paths you want to remove (with PRUNE_PATHS). Is there any easy way to achieve this, or any similar utility that will do what I want? (note: it should maintain an index like mlocate, so find is not acceptable, for example) Thanks.

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• Ubuntu 12.10 running slow

  - by andrew

  I pasted syslog and perhaps anyone can see trouble that might need attention. It is running too slow for what I would suspect. Opening apps and web pages just takes forever. http://paste.ubuntu.com/1303211/ System Specs: Oct 24 12:42:55 ubuntu kernel: [ 1.369735] powernow-k8: Found 1 AMD V140 Processor (1 cpu cores) (version 2.20.00) http://en.wikipedia.org/wiki/List_of_AMD_Phenom_microprocessors#.22Champlain.22_.2845_nm.2C_Single-core.29_2

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• How to become an expert in Python, PHP and Javascript? [closed]

  - by Andrew Alexander

  So I've been programming for about 9ish months now, and I've taught myself some Python, some PHP and some Javascript. I want to become better at these languages - I can hack something out, but a lot of things like OOP, using lists in the most effective ways, etc, is lost on me. What are the best ways to become an "expert" programmer? Does it depend on the nuances of the language, or is it more general? Is there any math I should be studying alongside it? Obviously a lot depends on what you want to do with it - so far I've mostly done small scale internal applications as well as web programming. How do I find out about good program design?

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• Best options for freelance or part-time programming? [closed]

  - by Andrew

  I apologize in advance if this is an inappropriate question for this SE. A few years back I was all set to study computer science and get a job programming, but went a totally different route and went into healthcare. I currently work as a paramedic on a rotating 24/48 schedule, so I have two days off for every day I work, and a decent bit of downtime on the days that I do work. I've been looking at ways to earn some extra money with all that spare time, and was wondering if it'd be worth the effort to try and find a part-time/freelance gig. I know HTML/CSS, PHP, and I'm pretty familiar with Python and Ruby (and Rails). Anyways, was hoping that someone could point me in the right direction as what "skill set" would give me the best chance to be able to land a part-time/freelance gig. I realize this is a rather open-ended question but any direction is appreciated.

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• How to edit files in a terminal with vim?

  - by andrew.46

  It is not always possible to edit and create files in a terminal and I would like to get the answers to the basics of manipulating files in a terminal using vim under Ubuntu Linux. Specific questions I have are: How can I open text files for editing? How can I save the file? How can I save the file with a different name? How can I leave the file without saving the changes? What settings are best in my configuration file and where is this file? How do I set the colors for vim? How do I show line numbers in vim and can this be toggled? A lot of questions here but I believe these questions and their answers should cover basic vim usage...

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• As a programmer, what's the most valuable non-English (human) language to learn?

  - by Andrew M

  I was thinking that with my developer skills, learning new languages like French, German etc. might be easier for me now. I could setup the verbs as objects in Python and use dir(verb) to find its methods, tenses and stuff ;-) But seriously, if you're a professional developer, in my case in the UK, what's the best foreign language to learn from an employment perspective? I'm thinking, like Hindi - if all our programming jobs are getting outsourced to India, might as well position yourself to be the on-site, go-between guy. Mandarin - if the Chinese become the pre-eminent economy, the new USA, in ten or twenty years, then speaking their language would open up a huge market to you. Russian - maybe another major up-and-comer, but already closer to Western standards. More IT-sector growth here than anywhere else in the coming years? Japanese - drivers of global technology, being able to speak their language could give you a big competitive advantage over other Westerners But I'm just guessing/musing with all these points. If you have an opinion, or even better, some evidence, I'd like to hear it. If the programming things falls through then at least it'll make for more interesting holidays.

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