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Articles indexed in October 2012

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• polipo E: Sub-process /usr/bin/dpkg returned an error code (1)

  - by ICXC

  @me:/home$ sudo apt-get install polipo Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: polipo 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 198 kB of archives. After this operation, 799 kB of additional disk space will be used. Get:1 http://sy.archive.ubuntu.com/ubuntu/ precise/universe polipo amd64 1.0.4.1-1.1 [198 kB] Fetched 198 kB in 2s (97.5 kB/s) Selecting previously unselected package polipo. (Reading database ... 169595 files and directories currently installed.) Unpacking polipo (from .../polipo_1.0.4.1-1.1_amd64.deb) ... Processing triggers for doc-base ... Processing 1 added doc-base file... Processing triggers for man-db ... Processing triggers for install-info ... Processing triggers for ureadahead ... Setting up polipo (1.0.4.1-1.1) ... Starting polipo: Couldn't open config file /etc/polipo/config: 2. invoke-rc.d: initscript polipo, action "start" failed. ****dpkg: error processing polipo (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: polipo E: Sub-process /usr/bin/dpkg returned an error code (1)****

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• After tarball restore my PC (tar xvfpz backup.tgz -C /), my sound card and network are not working. How to detect?

  - by axton hunger

  1 . I have a old laptop I installed Ubuntu 12.04 on. (It was ACER) 2 . I booted into single user mode and backed it up via cd / sudo -i tar cvpzf backup.tgz --exclude=/proc --exclude=/dev --exclude=/lost+found --exclude=/backup.tgz --exclude=/mnt --exclude=/sys / 3 . I installed a fresh copy of Ubuntu 1204 on my new laptop (It is Dell) 4 . I boot into single user mode 5 . I backup the existing /boot directory 6 . I untar my backup to restore on to the Dell sudo tar xvfpz backup.tgz -C / 7 . I restore the previous /boot directory again 8 . I boot it up, and my profile and settings are loaded ok but, Ubuntu shows that there is no Sound Card.. I cannot use unity to drag and change volume. I noticed that the network card also doesnt work. ** How do you make ubuntu recognize changed hardware, if the hardware is already configured for a different laptop? Does anyone know?**

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• How to configure an Ubuntu 12.04 virtual server and VMWare ESXi5 the way VMWare would be able to shut it down properly?

  - by Ivan

  I run an Ubuntu 12.04 server as a virtual machine on a VMWare ESXi 5 server. I've configured VMWare to shut the quest machines down the sane way (with an ACPI (if I understand it righ) shutdown signal so that guest OSes would do it). And this works with other VMs (running Windows 7 Professional and openSuSE) but doesn't work with the Ubuntu server - VMWare still offers just to power them off when I ask it to stop the guest. Any ideas how to fix this?

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• No sound in 12.04 on VirtualBox

  - by john crisp

  No sound when installed in VirtualBox. When I boot from the live CD in Windows, sound works fine on my speakers. When in boot the live CD in VirtualBox it does not see my speakers. In sound properties only digital output built in S/PDIF and headphones! I've done the pavcontrol - alsamixer - all settings are OK. I've tried both 32/64 versions of Ubuntu. Running current version VirtualBox. System: Windows 7 64 - i5. What am I overlooking?

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• Audio not working for Gnome Screencast Ctrl + Alt + Shift + R

  - by Costa

  I can do screencasts by pressing ctrl+alt+shift+r, but I get no sound when I view the videos, I've check my built in mic and headset, they both work on skype and such, I just can't record sound with the gnome built in screencasting. Also, when I open the videos in movieplayer they are in mute by default and there's nothing the the preferences I can find to change that. Any help would be awesome!

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• Single Full Name field in registration form user submits only first what to enter in my backend as last?

  - by Anagio

  On a registration form I have a single input called Full Name. The strings are parsed with http://code.google.com/p/php-name-parser/ so if a person enters their full name middle or any quantity of strings it's handled just fine and the app creates the user in a billing system with it's API. The form validates and checks for two strings in the field otherwise it won't post. I'd like to remove this validation but a last name is required by the API. You cannot post an empty last name to the API. Users are signing up for a trial so I don't want them having to deal with many form fields. The only place the last name shows up visible to the user is in their account settings page. If they end their trial and start a paid plan they'd have to enter their billing details which asks with two fields for their First, Last, and other billing information. What is an alternative to submitting "Doe", "Default", "Empty" in place of them not filling in their last name?

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• "Google files": Building a web interface to find/ack/grep

  - by user27915816

  I am working on a project where we would like to have build a web interface that gives the user the ability to "Google" files in a directory in a remote machine. For example, the user would type a string in a box, and then the system would find all files that contain that string and present them in the browser. The system would then give the user the ability click on any of the files to open them/display them in the browser. We want to avoid reinventing the wheel if possible, but don't really know where to start (none of us in the team have much experience building websites). What software packages, libraries or tools exist that can help us get this done?

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• Looking for a web service for students tracking

  - by shannoga

  I am working Voluntary association with a low budget. They asked me to build a tracking system for the students they work with. It is fairly simple, it needs to let them store data on the student personal details and grades and have the ability to get reports and charts on the students achievements. Since their budget is low I thought looking fro a web service that can feet their needs. Any Idea's?

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• Disqus 2012 comments NOT being indexed by Google

  - by Buckers

  We run a high-traffic website at http://www.onedirection.net and we've been using Disqus throughout this year, initially to great effect. We accepted the upgrade to Disqus 2012 back in June, loving the increased user experience and the better community feel - albeit back to an Iframe again. However the fact we were specifically told that the comments are now being indexed by Google was great, and the dynamic nature of the iFrame suited our site (all our pages are cached, so by using Disqus the comments are updated straight away). However, it seems that the Disqus 2012 comments are not being indexed, and we've noticed an obvious fall in traffic over the last few months. Initially we didn't put this down to Disqus and focused on other issues (Google algorithm updates etc). But we're quickly coming down the reasoning that our pages now contain less indexable text, and we are getting less traffic because of this. We've tried emailing Disqus directly but they're very slow and don't seem keen to help. Any thoughts on this?

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• Does an inventory limit in an MMORPG make sense?

  - by Philipp

  I am currently developing a simple 2d MMORPG. My current focus is the inventory system. I am currently wondering if I should implement a limit on what a player character can carry. Either in form of a maximum weight, a limited number of inventory slots, or a combination of both. Almost every MMORPG I ever played limits inventory space. But plausibility aside, is this really necessary from a gameplay point of view? Maybe it would in fact improve the game experience when I just let the players carry as much stuff as they want. tl;dr: What is the game development rationale behind limiting carrying capacity of player characters?

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• Box2dWeb positioning relative to HTML5 Canvas

  - by Joe

  I'm new with HTML5 canvas and Box2DWeb and I'm trying to make an Asteroids game. So far I think I'm doing okay, but one thing I'm struggling to comprehend is how positioning works in relation to the canvas. I understand that Box2DWeb is only made to deal with physical simulation, but I don't know how to deal with positioning on the canvas. The canvas is 100% viewport and thus can vary size. I want to fill the screen with some asteroids, but if I hardcore certain values such as bodyDef.position.x = Math.random() * 50; the asteroid may appear off canvas for someone with a smaller screen? Can anybody help me understand how I can deal with relative positioning on the canvas?

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• Any advice for dynamic music control?

  - by Assembler

  I would like to be able to dynamically progress the score, and affect the volume levels of separate channels within the music. How could I do this? From my experience with mod music (olden days Amiga music, Mod Tracker, Scream Tracker, Fast Tracker II, Impulse Tracker etc etc), I believe this is the best way to tackle the problem, to allow the music to move from one loop to another, without anything mixed down. I want to do this in AS3, and am considering pulling apart Flod to make this happen

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• Best practice settings Effect parameters in XNA

  - by hichaeretaqua

  I want to ask if there is a best practice settings effect parameters in XNA. Or in other words, what exactly happens when I call pass.Apply(). I can imagine multiple scenarios: Each time Apply() is called, all effect parameters are transferred to the GPU and therefor it has no real influence how often I set a parameter. Each time Apply() is called, only the parameters that got reset are transferred. So caching Set-operations that don't actually set a new value should be avoided. Each time Apply() is called, only the parameters that got changed are transferred. So caching Set-operations is useless. This whole questions is bootless because no one of the mentions ways has any noteworthy impact on game performance. So the final question: Is it useful to implement some caching of Set-operation like: private Matrix _world; public Matrix World { get{ return _world;} set { if(value == world)return; _effect.Parameters["xWorld"].SetValue(value); _world = value; } Thanking you in anticipation

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• Create Adventure Game Scene/Room/Backdrop from Real Photo

  - by Lyuben

  Is there a suitable software or a good tutorial for creating 2D rooms/scenery for adventure games from real photos? Is it possible to achieve good results by using photos, or the hand-drawn style will always be the best choice? Thank you! --- EDIT --- I want to clarify that I'm particularly interested in the art creation process, not on the environment in which to build games. I'm writing the game in Java for Android, but I don't think it matters. Also, I'm not trying to decide if the game will have photo realistic rooms or not - I want to achieve 2d pixelated, old-school style background scenes and I wonder if this can be made from photos, because I cannot draw them myself. For example, can I shoot a scene with my camera and then make it look something like the image in the following link: PIXEL ART FOREST I know that I cannot get the same quality as an absolutely hand-drawn pixel, but I'm looking for some decent technology/tutorial/software to make them somewhat similar.

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• What is a simple deformer in which vertices deform linearly with control points?

  - by sebf

  In my project I want to deform a complex mesh, using a simpler 'proxy' mesh. In effect, each vertex of the proxy/collision mesh will be a control point/bone, which should deform the vertices of the main mesh attached to it depending on weight, but where the weight is not dependant on the absolute distance from the control point but rather distance relative to the other affecting control points. The point of this is to preserve complex three dimensional features of the main mesh while using physics implementations which expect something far simpler, low resolution, single surface, etc. Therefore, the vertices must deform linearly with their respective weighted control points (i.e. no falloff fields or all the mesh features will end up collapsed) - as if each vertex was linked to a point on the plane created by the attached control points and deformed with it. I have tried implementing the weight computation algorithm in this paper (page 4) but it is not working as expected and I am wondering if it is really the best way to do what I want. What is the simplest way to 'skin'* an arbitrary mesh, to another arbitrary mesh? *By skin I mean I need an algorithm to determine the best control points for a vertex, and their weights.

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• How do I identify mouse clicks versus mouse down in games?

  - by Tristan

  What is the most common way of handling mouse clicks in games? Given that all you have in way of detecting input from the mouse is whether a button is up or down. I currently just rely on the mouse down being a click, but this simple approach limits me greatly in what I want to achieve. For example I have some code that should only be run once on a mouse click, but using mouse down as a mouse click can cause the code to run more then once depending on how long the button is held down for. So I need to do it on a click! But what is the best way to handle a click? Is a click when the mouse goes from mouse up to down or from down to up or is it a click if the button was down for less then x frames/milliseconds and then if so, is it considered mouse down and a click if its down for x frames/milliseconds or a click then mouse down? I can see that each of the approaches can have their uses but which is the most common in games? And maybe i'll ask more specifically which is the most common in RTS games?

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• Dynamic audio score/music

  - by Joel Martinez

  I'm interested in developing a game who's background music changes with the mood and scenario of the game's action. Of course many existing games do this (halo for example), but I was interested in any resources/papers/articles talking about the techniques to develop a system like this. I have some ideas, and I understand that this will be equally challenging to implement at the code level as it will be to come up or acquire music that fits this model. Any links or, answers with ideas in them would he appreciated. Edit: this is the kind of info I'm looking for :) http://halo.bungie.org/misc/gdc.2002.music/

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• Does Entity Framework currently support custom functions in the Where clause?

  - by André Pena

  Entity Framework currently supports table valued functions and custom functions defined in the SSDL, but I can't find any example of it being used as a criteria, in the where clause. Example: var query = this.db.People; query = query.Where(p = FullText.ContainsInName(p.Id, "George")); In this example, ContainsInName is my custom function that I want to be executed in the where clause of the query. Is it supported?

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• SOAP web services in haskell?

  - by Dave

  I have to write a bunch of small web services. They must be defined by a WSDL and work via SOAP-RPC, in order to work with an existing workflow engine and service registry framework. I can, however, serve them on a service stack/platform of my choice. I'm presently writing them in Java, and it's not too bad. But I'm thinking my life might be easier if I was able to write these services in Haskell. Searching on Google, it looks like, once upon a time, someone else had the same idea and started a project called "HAIFA". However, it looks like HAIFA hasn't been maintained for some years, and I couldn't find any other frameworks supporting serving up services written in Haskell as SOAP web services. Does anyone know of any other frameworks that will allow me to easily write SOAP-based web services using Haskell? If not, has anyone done this manually (i.e., use XML libraries from hackage to process the incoming soap-rpc requests, and create soap-rpc compliant replies)? Was it difficult to do? Any gotchas? Was it worth the effort? Thanks in advance!

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• Execution Plan Optimization when where clause is removed then added back

  - by nmushov

  I have a stored procedure that uses a table valued function which executes in 9 seconds. If I alter the table valued function and remove the where clause, the stored procedure executes in 3 seconds. If I add the where clause back, the query still executes in 3 seconds. I took a look at the execution plans and it appears that after I remove the where clause, the execution plan includes parallelism and the scan count for 2 of my tables drops for 50000 and 65000 down to 5 and 3. After I add the where clause back, the optimized execution plan still runs unless I run DBCC FREEPROCCACHE. Questions 1. Why would SQL Server start using the optimized execution plan for both queries only when I first remove the where clause? Is there a way to force SQL Server to use this execution plan? Also, this is a paramaterized all-in-one query that uses the (Parameter is null or Parameter) in the where clause, which I believe is bad for performance. RETURNS TABLE AS RETURN ( SELECT TOP (@PageNumber * @PageSize) CASE WHEN @SortOrder = 'Expensive' THEN ROW_NUMBER() OVER (ORDER BY SellingPrice DESC) WHEN @SortOrder = 'Inexpensive' THEN ROW_NUMBER() OVER (ORDER BY SellingPrice ASC) WHEN @SortOrder = 'LowMiles' THEN ROW_NUMBER() OVER (ORDER BY Mileage ASC) WHEN @SortOrder = 'HighMiles' THEN ROW_NUMBER() OVER (ORDER BY Mileage DESC) WHEN @SortOrder = 'Closest' THEN ROW_NUMBER() OVER (ORDER BY P1.Distance ASC) WHEN @SortOrder = 'Newest' THEN ROW_NUMBER() OVER (ORDER BY [Year] DESC) WHEN @SortOrder = 'Oldest' THEN ROW_NUMBER() OVER (ORDER BY [Year] ASC) ELSE ROW_NUMBER() OVER (ORDER BY InventoryID ASC) END as rn, P1.InventoryID, P1.SellingPrice, P1.Distance, P1.Mileage, Count(*) OVER () RESULT_COUNT, dimCarStatus.[year] FROM (SELECT InventoryID, SellingPrice, Zip.Distance, Mileage, ColorKey, CarStatusKey, CarKey FROM facInventory JOIN @ZipCodes Zip ON Zip.DealerKey = facInventory.DealerKey) as P1 JOIN dimColor ON dimColor.ColorKey = P1.ColorKey JOIN dimCarStatus ON dimCarStatus.CarStatusKey = P1.CarStatusKey JOIN dimCar ON dimCar.CarKey = P1.CarKey WHERE (@ExteriorColor is NULL OR dimColor.ExteriorColor like @ExteriorColor) AND (@InteriorColor is NULL OR dimColor.InteriorColor like @InteriorColor) AND (@Condition is NULL OR dimCarStatus.Condition like @Condition) AND (@Year is NULL OR dimCarStatus.[Year] like @Year) AND (@Certified is NULL OR dimCarStatus.Certified like @Certified) AND (@Make is NULL OR dimCar.Make like @Make) AND (@ModelCategory is NULL OR dimCar.ModelCategory like @ModelCategory) AND (@Model is NULL OR dimCar.Model like @Model) AND (@Trim is NULL OR dimCar.Trim like @Trim) AND (@BodyType is NULL OR dimCar.BodyType like @BodyType) AND (@VehicleTypeCode is NULL OR dimCar.VehicleTypeCode like @VehicleTypeCode) AND (@MinPrice is NULL OR P1.SellingPrice >= @MinPrice) AND (@MaxPrice is NULL OR P1.SellingPrice < @MaxPrice) AND (@Mileage is NULL OR P1.Mileage < @Mileage) ORDER BY CASE WHEN @SortOrder = 'Expensive' THEN -SellingPrice WHEN @SortOrder = 'Inexpensive' THEN SellingPrice WHEN @SortOrder = 'LowMiles' THEN Mileage WHEN @SortOrder = 'HighMiles' THEN -Mileage WHEN @SortOrder = 'Closest' THEN P1.Distance WHEN @SortOrder = 'Newest' THEN -[YEAR] WHEN @SortOrder = 'Oldest' THEN [YEAR] ELSE InventoryID END )

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• Increase efficiency for an R simulator of the Monty Hall Puzzle

  - by jahan_m

  The Monty Hall Problem is a simple puzzle involving probability that even stumps professionals in careers dealing with some heavy-duty math. Here's the basic problem: Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice? You can find numerous explanations of the solution here: http://en.wikipedia.org/wiki/Monty_Hall_problem Goal of my simulation: Prove that a switching strategy will win you the car 2/3 of the time. I got curious and wanted to write a little function that simulates the problem many times and returns the proportion of wins if you switched and the proportion of wins if you stayed with your first choice. The function then plots the cumulative wins. First and foremost, I'm interested in hearing if my simulation is indeed replicating the Monty Problem, or if some aspect of the code got it wrong. Secondly, this function takes a long time to run once I get to about 10,000 simulations. I know I don't need this many simulations to prove this but I'd love to hear some ideas on how to make it more efficient. Thanks for your feedback! Monty_Hall=function(repetitions){ doors=c('A','B','C') stay_wins=0 switch_wins=0 series=data.frame(sim_num=seq(repetitions),cum_sum_stay=replicate(repetitions,0),cum_sum_switch=replicate(repetitions,0)) for(i in seq(repetitions)){ winning_door=sample(doors,1) contestant_chooses=sample(doors,1) if(contestant_chooses==winning_door) stay_wins=stay_wins+1 else switch_wins=switch_wins+1 series[i,'cum_sum_stay']=stay_wins series[i,'cum_sum_switch']=switch_wins } plot(series$sim_num,series$cum_sum_switch,col=2,ylab='Cumulative # of wins', xlab='Simulation #',main=sprintf('%d Simulations of the Monty Hall Paradox',repetitions),type='l') lines(series$sim_num,series$cum_sum_stay,col=4) legend('topleft',legend=c('Cumulative wins from switching', 'Cumulative wins from staying'),col=c(2,4),lty=1) result=list(series=series,stay_wins=stay_wins,switch_wins=switch_wins, proportion_stay_wins=stay_wins/repetitions, proportion_switch_wins=switch_wins/repetitions) return(result) } #Theory predicts that it is to the contestant's advantage if he #switches his choice to the other door. This function simulates the game #many times, and shows you the proportion of games in which staying or #switching would win the car. It also plots the cumulative wins for each strategy. Monty_Hall(100)

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• Event sourcing: Write event before or after updating the model

  - by Magnus

  I'm reasoning about event sourcing and often I arrive at a chicken and egg problem. Would be grateful for some hints on how to reason around this. If I execute all I/O-bound processing async (ie writing to the event log) then how do I handle, or sometimes even detect, failures? I'm using Akka Actors so processing is sequential for each event/message. I do not have any database at this time, instead I would persist all the events in an event log and then keep an aggregated state of all the events in a model stored in memory. Queries are all against this model, you can consider it to be a cache. Example Creating a new user: Validate that the user does not exist in model Persist event to journal Update model (in memory) If step 3 breaks I still have persisted my event so I can replay it at a later date. If step 2 breaks I can handle that as well gracefully. This is fine, but since step 2 is I/O-bound I figured that I should do I/O in a separate actor to free up the first actor for queries: Updating a user while allowing queries (A0 = Front end/GUI actor, A1 = Processor Actor, A2 = IO-actor, E = event bus). (A0-E-A1) Event is published to update user 'U1'. Validate that the user 'U1' exists in model (A1-A2) Persist event to journal (separate actor) (A0-E-A1-A0) Query for user 'U1' profile (A2-A1) Event is now persisted continue to update model (A0-E-A1-A0) Query for user 'U1' profile (now returns fresh data) This is appealing since queries can be processed while I/O-is churning along at it's own pace. But now I can cause myself all kinds of problems where I could have two incompatible commands (delete and then update) be persisted to the event log and crash on me when replayed up at a later date, since I do the validation before persisting the event and then update the model. My aim is to have a simple reasoning around my model (since Actor processes messages sequentially single threaded) but not be waiting for I/O-bound updates when Querying. I get the feeling I'm modeling a database which in itself is might be a problem. If things are unclear please write a comment.

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• using replace to produce javascript code, django

  - by durdenk

  I want to use highcharts with my django site but it requires a comlex javascript code such as below. So I wanted to get this script in my python code and replace apropriate portions then write it in my template, first question is, is this a dump way to do that for a person not knowing javascript. I can read it tough. Second question is, Why I cant replace this string. Lets say this string is a variable like this. lineChartsTemplate = """ ... ... """ if I try and do lineChartsTemplate .replace('dataCategory', dataCategory) it basically suppossed to change dataCategory text with my dataCategory variable, but no such luck. I need guidance here. thx. $(function () { var chart = new Highcharts.Chart({ chart: { renderTo: 'container', type: 'bar' }, xAxis: { categories: dataCategory }, yAxis: { }, legend: { layout: 'vertical', floating: true, backgroundColor: '#FFFFFF', align: 'right', verticalAlign: 'top', y: 60, x: -60 }, tooltip: { formatter: function() { return '<b>'+ this.series.name +'</b><br/>'+ this.x +': '+ this.y; } }, plotOptions: { }, series: [{ data: dataList , name : 'Satislar'}] }); });

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• Displaying individual elements of an object in an Arraylist through a for loop?

  - by user1180888

  I'm trying to Display individual elements of an Object I have created. It is a simple Java program that allows users to add and keep track of Player Details. I'm just stumped when it comes to displaying the details after they have been added already. here is what my code looks like I can create the object and input it into the arraylist no problem using the case 2, but when I try to print it out I want to do something like System.out.println("Player Name" + myPlayersArrayList.PlayerName + "Player Position" + myPlayerArrayList.PlayerPosition + "Player Age" + "Player Age"); I know that is not correct, but I dont really know what to do, if anyone can be of any help it would be greatly appreciated. Thanks System.out.println("Welcome to the Football Player database"); System.out.print(System.getProperty("line.separator")); UserInput myFirstUserInput = new UserInput(); int selection; ArrayList<Player> myPlayersArrayList = new ArrayList<Player>(); while (true) { System.out.println("1. View The Players"); System.out.println("2. Add A Player"); System.out.println("3. Edit A Player"); System.out.println("4. Delete A Player"); System.out.println("5. Exit ") ; System.out.print(System.getProperty("line.separator")); selection = myFirstUserInput.getInt("Please select an option"); System.out.print(System.getProperty("line.separator")); switch(selection){ case 1: if (myPlayersArrayList.isEmpty()) { System.out.println("No Players Have Been Entered Yet"); System.out.print(System.getProperty("line.separator")); break;} else {for(int i = 0; i < myPlayersArrayList.size(); i++){ System.out.println(myPlayersArrayList); } break; case 2: { String playerName,playerPos; int playerAge; playerName = (myFirstUserInput.getString("Enter Player name")); playerPos = (myFirstUserInput.getString("Enter Player Position")); playerAge = (myFirstUserInput.getInt("Enter Player Age")); myPlayersArrayList.add(new Player(playerName, playerPos, playerAge)); ; break; }

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• What is wrong with this simple type definition? (Expecting one more argument to...)

  - by fluteflute

  basic.hs: areaCircle :: Floating -> Floating areaCircle r = pi * r * r Command: *Main> :l basic.hs [1 of 1] Compiling Main ( Sheet1.hs, interpreted ) Sheet1.hs:2:15: Expecting one more argument to `Floating' In the type signature for `areaCircle': areaCircle :: Floating -> Floating Failed, modules loaded: none. I see that areaCircle :: Floating a => a -> a loads as expected. Why is the above version not acceptable?

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