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• Well-tested libraries for player ratings?

  - by Lucky

  It's common in games to implement some sort of numerical ranking system -- the ELO system is usually used in chess. I could implement this system naively using Wikipedia's descriptions, but I suspect that this would open up a whole box of problems that have already been solved: rating inflation, etc -- for instance, the ELO system has a K constant that's 'fudged' according to rating, duration, pairings, statistics, ... What are some libraries (I'm looking at Python, but anything is okay) that implements rating systems? It also doesn't have to be ELO.

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• How to Stop Cyber Stalking Problems Happening on AOL Accounts

  In our society today there are very few people that do not have an Internet connection of some sort. Over the past several years the World Wide Web has become a place that individuals spend a great d... [Author: Ed Opperman - Computers and Internet - June 13, 2010]

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• Looking for free, specific Ip2Location Database

  - by Andresch Serj

  I am searching for a free db (like an updated XML or CSV file) that relates IP addresses to specific locations. I want more information than just the country. I want some sort of region or city reference, even if that ends up to be a number that makes no sense to me. Doesn't have to be super correct or always up to date either. It is just to distinguish between user groups and not to monitor or spy on them.

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• Google backs open codec against patent trolls

  <b>The Register:</b> "Google is "very confident" that the newly open-sourced VP8 video codec will stand up to the sort of patent attack Steve Jobs warned of when he defended Apple's decision to shun VP8's predecessor, the open-source Ogg Theora."

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• Finding vectors with two points

  - by Christian Careaga

  We're are trying to get the direction of a projectile but we can't find out how For example: [1,1] will go SE [1,-1] will go NE [-1,-1] will go NW and [-1,1] will go SW we need an equation of some sort that will take the player pos and the mouse pos and find which direction the projectile needs to go. Here is where we are plugging in the vectors: def update(self): self.rect.x += self.vector[0] self.rect.y += self.vector[1] Then we are blitting the projectile at the rects coords.

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• Installing Ubuntu by writing on the Hard Drive

  - by Alexandros Marinos

  I have a laptop whose CD drive is not operational and is too old to boot from a flash stick. I have bought a new hard drive for it for which I have an enclosure. Is there a way to configure the disk as an external to my current ubuntu setup, copy some form of ubuntu on the hard drive, place the HD in the old laptop, and have ubuntu install ubuntu from there? Effectively what I am asking about is some sort of live cd that installs on itself (since the HD is writeable).

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• Basic Mouse Features in Silverlight

  - by Sayre Collado

  Hi Guys, I have basic sample on how to use some features of mouse events in Silverlight. The picture. The Mouse Activity Log is to record the all activity done on the projects. My simple snippets on how to add on the textbox is:         protected void MessageLog(string msg)         {             txtMouseLog.Text += msg;         }   For the Mouse Wheel sample this is the snippets:         private void chkMouseWheel_Checked(object sender, RoutedEventArgs e)         {             image1.MouseWheel += new MouseWheelEventHandler(image1_MouseWheel);         }           void image1_MouseWheel(object sender, MouseWheelEventArgs e)         {             ImgScale.ScaleX = e.Delta > 0 ? ImgScale.ScaleX * 1.5 : ImgScale.ScaleX * 0.8;             ImgScale.ScaleY = e.Delta > 0 ? ImgScale.ScaleY * 1.5 : ImgScale.ScaleY * 0.8;               e.Handled = true;         }    And the XAML:        <Image Height="139" Name="image1" Stretch="Fill" Width="178" Source="/GBLOgs1;component/Images/Sunset.jpg">            <Image.RenderTransform>                 <ScaleTransform x:Name="ImgScale"></ScaleTransform>            </Image.RenderTransform>        </Image     I have also the showing of mouse position:           private void Mouse_MouseMove(object sender, MouseEventArgs e)         {             Point point = e.GetPosition(this);             lblMouseLocation.Content = "X: " + point.X + "and Y: " + point.Y;         }           private void checkBox1_Checked(object sender, RoutedEventArgs e)         {             lblMouseLocation.Visibility = Visibility.Visible;             MessageLog("Mouse Location Visible\n");         }           private void checkBox1_Unchecked(object sender, RoutedEventArgs e)         {             lblMouseLocation.Visibility = Visibility.Collapsed;             MessageLog("Mouse Location Collapsed\n");            And even the counting of clicked event:           int clicked = 0;         private void LayoutRoot_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)         {             Point point = e.GetPosition(this);             clicked++;               string msg = "Mouse Clicked " + clicked.ToString() + " time(s) " +                                     "Mouse Location X and Y: " + point.X + " " + point.Y + "\n";               MessageLog(msg);         }     And now the result of above snippets. Happy Programming.

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• How to highlight the last active window in the GNOME shell preview

  - by Yisela

  Is there a way to highlight (with some sort of indicator) the last active window in the Gnome launcher? Suppose this is my launcher, and I have just used the Terminal. I'm wondering if there is a way to highlight it as the last active one, to differentiate it from the rest of the windows: So the result would be something like this: I'm completely new to Ubuntu and Ask Ubuntu, so please let me know if this question needs to be edited.

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• How to have a soft-real-time process in presense of heavily swapping IO-intensive background load?

  - by Vi

  schedtool: PID 32301: PRIO 4, POLICY R: SCHED_RR , NICE -20, AFFINITY 0xf ionice: realtime: prio 4 But the music is stumbling anyway. Background load is low prio (SCHED_IDLEPRIO, idle ionice), but uses a lot of memory (more than is physically available) and does a lot of IO and calculations. Latencytop shows about 1500ms for: Following symlink Writing buffer to disk (sync) Page fault Writing a page to disk both for the bg load and for unrelated processes. Load average is 10 and counting. Why cannot it allocate, for example, 200MHZ of one of the cores and 32M of memory and not less than once per second opportunity for IO for mplayer to make it happy while continuing calculations on the background? Or: why it cannot leave background task and swap loving each other but keeping the rest of the system as if there were no background load? How to have RT processes AND heavy bg load simultaneously (without of virtual machines)?

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• Windows 8 App Wish List

  - by Tim Murphy

  As I have been using Windows 8 more some of them apps that come with the system have been missing some features that I would like to see.  So Microsoft, here is my wish list for some new features. Skydrive Copy files from one folder to another in Skydrive Get public and read only URLs of a file   OneNote MX Print a page   Mail Accept/Reject appointments Sort inbox Search inbox (use the search charm) Print email   Store Keyword search (use the search charm)   del.icio.us Tags: Windows 8

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• External modules security

  - by Jlouro

  I am developing some external modules for an application. These modules are BPL files and if present in the application folder the application loads them and uses whatever is available inside. How can I prevent the sharing of these modules by my clients? I need them to be authorized to use the modules (module by module). To have some sort of license, registration of the module, what is the best method? Thanks

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• Is it wrong to tell mobile users to view a site on their computer?

  - by betamax

  I am creating a web application that doesn't work correctly on mobile. I don't want to make it work on mobile because I would rather mobile users have a fully integrated experience and not have to use the web version. This mobile version will be released at a later date based on reaction to the initial web-based version. So, my question is: Is it wrong to not allow mobile users to use the site and instead show them some sort of splash screen telling them to come back to the site on a computer?

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• Free, specific Ip2Location Database

  - by Andresch Serj

  I am searching for a free db (like an updated xml or csv file) that relates ip adresses to specific locations. I want more information than just the Country. I want some sort of region or city refference, even if that ends up to be a number that makes no sense to me. Doesn't have to be super correct or always up to date either. It is just to distinguish between usergroups and not to monitor or spy on them.

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• How to estimate effort required to convert a large codebase to another language/platform

  - by Justin Branch

  We have an MFC C++ program with around 200,000 lines of code in it. It's pretty much finished. We'd like to hire someone to convert it to work for Macs, but we are not sure how to properly estimate a reasonable timeline for this project. What techniques can we use to estimate what it would take to convert this project to work on a Mac? Also, is there anything in particular we should be watching out for specific to this sort of conversion?

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• A music player that can handle multiple artist tags

  - by Keidax

  The mp3 format can handle multiple artists per track (in the form of "artist1\artist2"), and as far as I know other modern music formats can do the same thing. However, Rhythmbox (my default music player) seems to be capable of only reading the first artist. Are there any music players that can read and sort songs with multiple artists, or a plugin for Rhythmbox that can provide this functionality?

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• Is it OK to repeat code for unit tests?

  - by Pete

  I wrote some sorting algorithms for a class assignment and I also wrote a few tests to make sure the algorithms were implemented correctly. My tests are only like 10 lines long and there are 3 of them but only 1 line changes between the 3 so there is a lot of repeated code. Is it better to refactor this code into another method that is then called from each test? Wouldn't I then need to write another test to test the refactoring? Some of the variables can even be moved up to the class level. Should testing classes and methods follow the same rules as regular classes/methods? Here's an example: [TestMethod] public void MergeSortAssertArrayIsSorted() { int[] a = new int[1000]; Random rand = new Random(DateTime.Now.Millisecond); for(int i = 0; i < a.Length; i++) { a[i] = rand.Next(Int16.MaxValue); } int[] b = new int[1000]; a.CopyTo(b, 0); List<int> temp = b.ToList(); temp.Sort(); b = temp.ToArray(); MergeSort merge = new MergeSort(); merge.mergeSort(a, 0, a.Length - 1); CollectionAssert.AreEqual(a, b); } [TestMethod] public void InsertionSortAssertArrayIsSorted() { int[] a = new int[1000]; Random rand = new Random(DateTime.Now.Millisecond); for (int i = 0; i < a.Length; i++) { a[i] = rand.Next(Int16.MaxValue); } int[] b = new int[1000]; a.CopyTo(b, 0); List<int> temp = b.ToList(); temp.Sort(); b = temp.ToArray(); InsertionSort merge = new InsertionSort(); merge.insertionSort(a); CollectionAssert.AreEqual(a, b); }

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• ubuntu 12.04 server doesn't resolve local domain name

  - by jdog

  After apt-get upgrade this morning, my Ubuntu 12.04 web server does no longer resolve a domain name hosted on it. I also received the error message: "resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything." I found this question Network Manager not populating resolv.conf but the solutions provided there did not resolve the problem. Creating the symlink in fact caused websites to load very slowly, so I assume there is some sort of (reverse?) DNS lookup not working, when I create the symlink.

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• Double lock screen Ubuntu 14.04

  - by Adam

  So I've got a brandynew System 76 laptop running Ubuntu 14.04, and if I close the lid, putting it to sleep, and reopen it, I am presented with the very nice new Unity lock screen. However, when I enter my password, and it succeeds, it then presents me with a second lock screen. Where I have to enter my password again, before finally being let into the desktop. Hash anyone else seen this sort of behavior?

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• Failing RAM, or something else?

  - by Thanatos

  I have a IBM Thinkpad T43, currently running Windows XP. Programs were crashing, XP was blue-screen-of-deathing, (more than usual) - it was basically unusable, but I couldn't get any informative error out of XP. I booted Ubuntu off a thumbdrive, which made it to the desktop, but as soon as I started to try to do anything, X segfaulted, along with several other services, followed quickly by kernel warnings and a kernel panic. I'm currently running Memtest86+ on this machine, which is spitting out numerous errors. (16k over 3 passes, and counting) The failing areas are numerous, and look something like this: 0001055da4 - XX.X MB, etc. The addresses that fail seem to cluster around 0-20 MB, 250MB, and, more rarely, 750MB, 1000MB, and 1200MB. However, a lot (but not all) of the failing addresses that I've seen end in XXXXXXX?da4 where the ? is a 1 or a 5. The machine has two sticks of RAM, one 512MB, one 1024 MB, the 512MB mapped to the lower addresses, the 1024 MB stick following. Is this indeed RAM failure, or should I consider other things before purchasing more RAM?

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• Data Validation of a Comma Delimited List

  - by Brad

  I need a simple way of taking a comma seperated list in a cell, and providing a drop down box to select one of them. For Example, the cell could contain: 24, 32, 40, 48, 56, 64 And in a further cell, using Data Validation, I want to provide a drop-down list to select ONE of those values I need to do this without VBA or Macros please. Apolgies, I want this to work with Excel 2010 and later. I have been playing around with counting the number of commas in the list and then trying to split this into a number of rows of single numbers etc with no joy yet.

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• non randomic enemy movement implementation

  - by user601836

  I would like to implement enemy movement on a X-Y grid. Would it be a good idea to have a predefined table with an initial X-Y position and a predefined "surveillance path"? Each enemy will follow its path until it detects a player, at this point it will start chasing it using a chasing algorithm. According to a friend of mine this implementation is good because the design of a good path will provide to the user a sort of reality sensation.

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• Is there a term for quasi-open source proprietary software?

  - by mwhite

  Say a company wants to keep development of new features of a piece of software internal, but wants to make the source code for previous versions public, up to and including existing public features, so that other people can benefit from using and modifying the software themselves, and even possibly contribute changes that can be applied to the development branch. Is there a term for this sort of arrangement, and what is the best way of accomplishing it using existing version control tools and platforms?

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• Branding/Restricting a Software by License/Serial

  - by Sid

  I have made a POS System for a client of mine using MS Access Server-Client approach. He asked me to brand his software to allow only a certain "number" of users (cashiers) to access the POS System, and must be determined to the license his client will buy. EX: 10 User License = 10 Cashiers ( not necessarily 10 users, it can be 30 users, shifting) = it means 10 PCs will be installed with the client software I made. How and where do I put the logic that will determine if it is licensed or not. What I have done: I have created a serial key generator using Name. Problem is it can be duplicated once you give than name+serial combination, it would still work. I am counting the number of users logged at a time. This could be problematic as I am using MSAccess and not MSSQL. I have scrapped this idea, He also asked me if I could just put serial+mac address combination. That I could do but he will have a hard time implementing it and selling it if he needs the mac address of every computers to be installed with my POS. I am at lost on what can I do. Would like to ask for tips and suggestions. Thank you.

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• Managing many draw calls for dynamic objects

  - by codetiger

  We are developing a game (cross-platform) using Irrlicht. The game has many (around 200 - 500) dynamic objects flying around during the game. Most of these objects are static mesh and build from 20 - 50 unique Meshes. We created seperate scenenodes for each object and referring its mesh instance. But the output was very much unexpected. Menu screen: (150 tris - Just to show you the full speed rendering performance of 2 test computers) a) NVidia Quadro FX 3800 with 1GB: 1600 FPS DirectX and 2600 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 260 FPS in OpenGL Now inside the game in a test level: (160 dynamic objects counting around 10K tris): a) NVidia Quadro FX 3800 with 1GB: 45 FPS DirectX and 50 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 45 FPS in OpenGL Obviously we don't have the option of mesh batch rendering as most of the objects are dynamic. And the one big static terrain is already in single mesh buffer. To add more information, we use one 2048 png for texture for most of the dynamic objects. And our collision detection hardly and other calculations hardly make any impact on FPS. So we understood its the draw calls we make that eats up all FPS. Is there a way we can optimize the rendering, or are we missing something?

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• How to Write Manageable Code With Functional Programming?

  - by dade

  I just started with Functional Programming(Node.Js) and from the look of things it looks as if the code am writing would grow to be one hell of a code base to manage, when compared to Programming languages that have a sort of Object Oriented Paradigm. With OOP I am familair with practices that would ensure your code is easily managed and extensible. But am nore sure of similar convention with Functional Programming.

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