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• in memory datastore in haskell

  - by Simon

  I want to implement an in memory datastore for a web service in Haskell. I want to run transactions in the stm monad. When I google hash table steam Haskell I only get this: Data. BTree. HashTable. STM. The module name and complexities suggest that this is implemented as a tree. I would think that an array would be more efficient for mutable hash tables. Is there a reason to avoid using an array for an STM hashtable? Do I gain anything with this stem hash table or should I just use a steam ref to an IntMap?

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• How do I install the build dependencies for Android?

  - by newcomer

  Hi, I'm trying build the Android source using these packages. ButI am getting this error: $ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev ia32-libs x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev [sudo] password for asdf: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package libc6-dev-i386 E: Unable to locate package lib32ncurses5-dev E: Unable to locate package ia32-libs E: Unable to locate package lib32readline5-dev E: Unable to locate package lib32z-dev I tried to download & install say libc6-dev-i386 debian package form here. But when I double click on the .deb file Ubuntu Software Manager says wrong architecture 'amd64'. (My OS: 32-bit Ubuntu 10.10 (updated), Processor: AMD phenom II 64-bit.)

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• Circle vs Edge collision detection / resolution

  - by topheman

  I made a javascript class Ball.js that handles physics interactions betweens balls as well as painting. In the v1.0, the ball vs ball collision detection and resolution is well handled. In the next version (v2), I'm trying to add edgeCollision handling. I'm having some problems, maybe you will be able to help me. All the v2 branch source code is on github repository : https://github.com/topheman/Ball.js/tree/v2 The v2 demos (where you can see the bug I will be talking about) : http://labs.topheman.com/Ball-v2/#help As you will see on the demo, I have two major problems that I'm having a really hard time to solve on Ball.js : method resolveEdgeCollision : bounce angle is inconsistent method checkEdgeCollision : if the ball's velocity (the length that it runs each frame) is higher than its diameter, eventually, it will pass through an edge, without triggering any collision Any Ideas ?...

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• After installing ubuntu 12.04 my internet connection has completely disappeared

  - by Tony

  On my PC after installing Ubuntu 12.04 my networks are completely gone. Inside the terminal, after typing in nm-tool I get the following: The program nm-tool is currently not installed. You can install by typing: sudo apt-get install network-manager After I type that in then my password I get this: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: network manager : Depends: iputils-arping but it is not going to be installed E: Unable to correct problems, you have held broken packages I'm a complete novice when it comes to computers so I have no clue.

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• Unable to install ia32-libs package

  - by Ron Thomas

  I need to manually install the drivers for my graphics card, which is an ATI 2600 xt. But I am using a 64-bit platform and to do so i need the ia32-libs package. i have scoured the net for fixes, workarounds etc. but have found none that work. the output i get after trying apt-get is: Reading package lists... Done Building dependency tree Reading state information... Done Package ia32-libs is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'ia32-libs' has no installation candidate I am running linux mint 12

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• How to install wvdial without getting the following error?

  - by chndn

  When I ran the command: sudo apt-get install wvdial I got this error message : error p@p:~$ sudo apt-get install wvdial Reading package lists... Done Building dependency tree Reading state information... Done Package wvdial is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package wvdial has no installation candidate p@p:~$ So how can I install wvdial? I don't have access to internet from Ubuntu for direct installation. Please help

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• Cinnamon cannot install due to libbgjs0 dependency

  - by Kin.

  I was following the How do I install the Cinnamon Desktop?, but when i install, it like this locahost@locahost:~$ sudo apt-get install cinnamon Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: cinnamon : Depends: libgjs0- E: Unable to correct problems, you have held broken packages. How can i install the libgjs0- package?

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• Cinnamon install problem ubuntu 12.04

  - by Kin.

  I was following the How do I install the Cinnamon Desktop?, but when i install, it like this locahost@locahost:~$ sudo apt-get install cinnamon Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: cinnamon : Depends: libgjs0- E: Unable to correct problems, you have held broken packages. How can i install the libgjs0- package?

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• Force install apt-get

  - by Web Developer

  I tried installing beanstalkd with sudo apt-get install beanstalkd (also with -f option) and I get the following error: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run `apt-get -f install' to correct these: The following packages have unmet dependencies: beanstalkd: Depends: libevent-1.4-2 (>= 1.4.13-stable) but it is not going to be installed mysql-server-5.1: Depends: mysql-client-5.1 (>= 5.1.62-0ubuntu0.10.04.1) but it is not going to be installed Depends: libmysqlclient16 (>= 5.1.21-1) but it is not going to be installed Depends: mysql-server-core-5.1 (>= 5.1.62-0ubuntu0.10.04.1) but it is not going to be installed PreDepends: mysql-common (>= 5.1.62-0ubuntu0.10.04.1) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

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• Building dynamic bounding box hierachies.

  - by adivasile

  I've been reading about collision detection and I saw that the first part was a coarse detection which generates possible contacts using bounding box hierarchies. I understand the concept of splitting up your objects in groups, to speed up the detection phase, but I'm a little confused on how do you actually build the hierachy, more so on what criteria is used to group them together. Do I iterate through all the objects in the scene, and check the distance between them to see where they should be inserted in the tree? Do you know some resources that may shed some light on this topic for me?

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• Diagramming software with API allowing high customisation of shapes and actions

  - by jenson-button-event

  I am after something like Visio or Lucid. A relatively simple charting/diagramming tool, to build tree-like structures from (my) pre-defined nodes (squares), but with a powerful API. Requirements: limit the type of objects allowed to be dropped on the diagram validate a model (e.g. node of type A must precede node of type B; must enter node Title) export a model import a model Our domain is very specific, and its a tool we'd want to offer to some of our power users. The $500 Visio licence isn't really within the business model. I'll put no constraints on framework or deployment (web or desktop) - is there anything out there?

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• Wine dependencies

  - by user206923

  Hello I am new here and I have been trying to install wine: $ sudo apt-get install wine1.7 Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: wine1.7 : Depends: wine1.7-i386 (= 1.7.4-0ubuntu4) but it is not installable E: Unable to correct problems, you have held broken packages. what should i do ?

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• Optimizing hierarchical transform

  - by Geotarget

  I'm transforming objects in 3D space by transforming each vector with the object's 4x4 transform matrix. In order to achieve hierarchical transform, I transform the child by its own matrix, and then the child by the parent matrix. This becomes costly because objects deeper in the display tree have to be transformed by all the parent objects. This is what's happening, in summary: Root -- transform its verts by Root matrix Parent -- transform its verts by Parent, Root matrix Child -- transform its verts by Child, Parent, Root matrix Is there a faster way to transform vertices to achieve hierarchical transform? What If I first concatenated each transform matrix with the parent matrices, and then transform verts by that final resulting matrix, would that work and wouldn't that be faster? Root -- transform its verts by Root matrix Parent -- concat Parent, Root matrices, transform its verts by Concated matrix Child -- concat Child, Parent, Root matrices, transform its verts by Concated matrix

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• Are there some methodologies to define a game's rules?

  - by bAN

  I would like to write some rules for a game I have in head but I don't know how to do that. So are there some methodologies or modeling tools (like UML) to do that? I'm thinking about a kind of tree of competencies or some kind of map to be sure that the game is well balanced. I always wonder how the team who imagines some powers in magic the gathering for example does it. Do they have some diagrams to be sure the powers or creatures they imagine are well balanced for the entire game? I'm pretty noob in the game creation so I'll be happy with some directions to seek.. Technical terms or basic principles to learn. Thanks for help.

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• Failed i3wm install package has unment dependinces

  - by Spiitfire

  Tried installing i3wm from these instructions using the Ubuntu ppa http://i3wm.org/docs/repositories.html Got this error when I typed in the final command apt-get install i3 sudo apt-get install i3 Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: i3 : Depends: i3-wm (= 4.6.1-1+g4.6-88-ge99158e1) but it is not going to be installed E: Unable to correct problems, you have held broken packages. When I tried downloading the .deb file and running it I get an error in the software center saying "Dependency is not satisfiable: i3-wm (=4.5.1-2) Any ideas I am pretty much a noob

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• Efficient way of detecting a touched object in a game?

  - by Pin

  Imagine a Sims-like 2D game for a touch based mobile phone where one can interact with virtually any object in the scene. How can I efficiently detect which object is being touched by the player? In my short experience, looping through all the visible objects in the scene and checking if they're touched has so far done the job, but when there may be many many moving objects in the screen that sounds kind of inefficient isn't it? Keeping the visible moving objects list can consume time in itself as one may have to loop through all of them each frame. Other solutions I've thought are: Spatial hashing. Divide the screen as a grid and place the visible objects in the corresponding bucket. Detection of the clicked object is fast but there's additional overhead for placing the objects in the correct bucket each frame. Maintaining a quad-tree. Moving objects have to be rearranged all the time, the previous solution looks better. What is usually done in this case?

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• Abstract skill/talent system implementation

  - by kiliki

  I've been making small 2D games for about 3 years now (XNA and more recently LWJGL/Slick2D). My latest idea would involve some form of "talent tree" system in a real time game. I've been wracking my brain but can't think of a structure to hold a talent. Something like "Your melee attack is an instant kill if behind the target" I'd like to come up with an abstract object rather than putting random conditionals into other methods. I've solved some relatively complex problems before but I don't even know where to begin with this one. Any help would be appreciated - Java, pseudocode or general concepts are all great.

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• Show Ubuntu logo in Byobu (tmux) status bar?

  - by RSoul

  For some reason my Byobu (tmux) status bar is showing TAB instead of the ubuntu logo. This: where it should be this: I've tried installing some different fonts, but have not corrected the issue yet. Any ideas? Further information: sudo apt-get install ttf-ubuntu-font-family Reading package lists... Done Building dependency tree Reading state information... Done ttf-ubuntu-font-family is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Update: fc-list on my computer shows all the fonts with the prefix /usr/share/fonts/ e.g., /usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf: Ubuntu Mono:style=Regular But the same command on a working system shows fonts listed thus: Ubuntu Mono:style=Bold Italic Perhaps it's a font location problem?

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• What good free forum engines are out there? [closed]

  - by user1306322

  I'm looking for a forum engine for my website, which will look modern, easy to use and follow lengthy discussions. Most of the times people hear "forum" they imagine unresponsive phpBB with terrible color scheme and unnecessarily huge user info sections (avatar, signature) about 600px high each, which make it impossible to see more than 5 posts on a really big screen. I'd like it to be the other way around with my future forum. Features I'd like to see: Clean, transparent section/thread selection, Must not have "message posted, you will be redirected to wherever" screens, 1-click message posting (captchas are ok, but not the ones that erase the whole post when you mistype), Tree hierarchy for comments to posts

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• Why is the superblock last mount time in the future?

  - by user69541

  Future time: Since installing Ubuntu 12.04, I regularly have to fun fsck and reset my clock because it shows a 'future time' : Err.Msg. "superblock last mount time is in the future by less than a day, probably due to hardware clock being incorrectly set." FIXED. According to what I have read, it looks like I'm in the right place to get an answer. Following are my feeble attempts to rectify this annoyance: mjh@mjh-desktop:~$ sudo service ntp start [sudo] password for mjh: ntp: unrecognized service mjh@mjh-desktop:~$ mjh@mjh-desktop:~$ sudo apt-get install update Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package update mjh@mjh-desktop:~$ sudo service ntp start ntp: unrecognized service mjh@mjh-desktop:~$ Suggestions? Matthew

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• MacBook 5,1 - cant change brightness on 12.04

  - by RunnerUp

  I'm a total newbie to Ubuntu and recently decided to give it a go on my early 2009 Alu MacBook. For about a week now I've been trying to get the brightness controls to work. I've tried the following: Brightness controls doesn't work on a MacBook Pro 5.5 (ubuntu 12.04 LTS) https://help.ubuntu.com/community/MacBookPro5-5/Precise#LCD None of it seems to work. Next option was to try the Nvidia-bl-dkms drivers, but aftert installing the Mactel PPA I just get this: Reading package lists... DoneBuilding dependency tree Reading state information... Done E: Unable to locate package nvidia-bl-dkms Any help would be much appreciated as my eyes are going to fall out soon with the brightness maxed out.

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• package update in ubuntu on vitual box

  - by Ayusman

  while following one of the tutorials I needed to install a curl package. Here are my system configuration: Virtualbox 4.1 on Windows 7 64 bit. I have installed ubuntu 12.04 on the virtual box. When I try the following: sudo apt-get install curl I see the following errors: [sudo] password for userMe: Reading package lists... Done Building dependency tree Reading state information... Done Package curl is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'curl' has no installation candidate userMe@userMe-ubuntu:~$ When I try the same on a direct installation of ubuntu on a laptop (not a virtual machine) there is no problem. I am assuming this may be because of network settings. Please note that my work PC is in a corporate network and uses auto proxy settings (using a .pac file) for internet access etc. Any help will be appreciated.

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• How to install g++ in Ubuntu 14.04?

  - by Apoorva sahay

  I have recently installed ubuntu 14.04 in virtual box. Now I want to install g++ 4.7 in it. I am trying this command in terminal but its not working. sudo apt-get install g++-4.7 Reading package list... Done Building dependency tree Reading state information... Done E: Unable to locate package g++-4.7 E: Couldn't find any package by regex 'g++-4.7' But I find gcc was there with Ubuntu 14.04 installation itself. How could I install g++ in ubuntu 14.04 and any version of g++ abouve 4.7.2 is fine with me.

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• Not able to create Live CD

  - by Jagannath Harati

  I downloaded 12.04.1 on a Windows 7 machine. I burnt a DVD from the ISO image using Windows Disc Image Burner. I had 'verify disc' on. The disc was created successfully with no errors. I was not able to use this disc for installing Ubuntu on another Windows 7 machine. I do not get the Welcome Screen on booting. I find that on the disc I burnt, I do not find bin, disc tree, programs directories and cdromupgrade, start.*, ubuntu* files. I found the boot directory and WUBI executable file. I tried downloading several times with the same result. I had similar problem earlier with 11.04. Can you please let me where the problem is?

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• installing win7 x64 in VirtualBox - error driver device missing

  - by chrisjlee

  After creating a vhd and going through that process i'm unable to install win7 x64. I've went through various settings and trying to get it right. It'll boot the windows install but then indicate the following error (image included too): A required cd/dvd drive device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now. Note if the windows installation media is in the CD/DVD drive, you can safely remove it for this step. I've also set up my storage tree like so: Would anyone know what the issue could be? It's asking for cd/dvd device drivers and i'm unable to install.

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