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  • No root file system - Alternate CD + LVM

    - by Carlos
    I am trying to install 11.10 as dual boot with Windows 7. I have all partitioned well as you can see here: http://www.flickr.com/photos/42897978@N00/7111180385/ I burned the Alternate CD ISO to a CD. Boot from it and followed instructions to Partitioning. There, I configured the LVM partitions as follows: Volume Group ubuntu-vg - Uses Physical Volume /dev/sda7 380GB - Provides Logical Volume home-lv 60GB - Provides Logical Volume root-lv 60GB - Provides Logical Volume swap-lv 6GB That is all I want (note that my /boot is outside of LVM) Then when I say that all is Ok and to write it to disk and continue with the installation, I get the following error. !! Partition Disks No root file system No root file system is defined Please correct this from the partitioning menu. What should I fix and how? I tried issuing the "Revert changes to partitions", but nothing happens. It seems that the LVM configuration has already been written to the CD. HELP!!

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  • How to fix “Unit Test Runner failed to load test assembly”

    - by ybbest
    I encountered this issue a couple times during my recent project, every time I forgot what actually cause the issue. Therefore, I decide to write a quick blog post to make sure I can identify the issue quickly. Problem: Run unit test using a test runner and received a Unit Test Runner failed to load test assembly exception. Analysis: Basically, I have changed some code and start the test runner to run tests. The same dll have already been deployed to GAC. So the test runner actually tries to use the old version of the assembly thus could not load the assembly. Solution: Deploy the current version of dll to the GAC and re-run your test, it works like a charm.

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  • The menu in the titlebar disappears in 12.10

    - by kinsago
    When running various programs (as I write this, with Chrome & Evolution) I move my mouse to the title bar to access the menu. The menu only seems to appear if I target the buttons to the left. When I move the mouse off the buttons (but still on the title bar) to select a menu then most times the menu disappears. It would seem this only happens on of my displays (of which I have 2) and it is the display that has the unity menu on it. Any ideas?

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  • Pair Programming: Pros and Cons

    - by O.D
    I need some experience reporting from the ones who have done pair programming, I noticed that lots of people recommend it but my experience was that at one point it's more efficient to sit alone, think and then write code than to talk with the other programmer (which can be very annoying to other programmers in the same office), do you agree to this? and if yes can you mention situations where pair programming is less efficient than traditional programming? Actually, I'm more interested in Cons than in Pros, but if it's your own experience I would like to read both, the Cons and the Pros. I would like to read what you think about the Programmer who doesn't have the keyboard, what can he do in the meanwhile other than talking about the concept? or checking the code on the screen?

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  • Drawing on a webpage – HTML5 - IE9

    - by nmarun
    So I upgraded to IE9 and continued exploring HTML5. Now there’s this ‘thing’ called Canvas in HTML5 with which you can do some cool stuff. Alright what IS this Canvas thing anyways? The Web Hypertext Application Technology Working Group says this: “The canvas element provides scripts with a resolution-dependent bitmap canvas, which can be used for rendering graphs, game graphics, or other visual images on the fly.” The Canvas element has two only attributes – width and height and when not specified they take up the default values of 300 and 150 respectively. Below is what my HTML file looks like: 1: <!DOCTYPE html> 2: <html lang="en-US"> 3: <head> 4: <script type="text/javascript" src="CustomScript.js"></script> 5: <script src="jquery-1.4.4.js" type="text/javascript"></script 6:  7: <title>Draw on a webpage</title> 8: </head> 9: <body> 10: <canvas id="canvas" width="500" height="500"></canvas> 11: <br /> 12: <input type="submit" id="submit" value="Clear" /> 13: <h4 id="currentPosition"> 14: 0, 0 15: </h4> 16: <div id="mousedownCoords"></div> 17: </body> 18: </html> In case you’re wondering, this is not a MVC or any kind of web application. This is plain ol’ HTML even though I’m writing all this in VS 2010. You see this is a very simple, ‘gimmicks-free’ html page. I have declared a Canvas element on line 10 and a button on line 11 to clear the drawing board. I’m using jQuery / JavaScript show the current position of the mouse on the screen. This will get updated in the ‘currentPosition’ <h4> tag and I’m using the ‘mousedownCoords’ to write all the places where the mouse was clicked. This is what my page renders as: The rectangle with a background is our canvas. The coloring is due to some javascript (which we’ll see in a moment). Now let’s get to our CustomScript.js file. 1: jQuery(document).ready(function () { 2: var isFirstClick = true; 3: var canvas = document.getElementById("canvas"); 4: // getContext: Returns an object that exposes an API for drawing on the canvas 5: var canvasContext = canvas.getContext("2d"); 6: fillBackground(); 7:  8: $("#submit").click(function () { 9: clearCanvas(); 10: fillBackground(); 11: }); 12:  13: $(document).mousemove(function (e) { 14: $('#currentPosition').html(e.pageX + ', ' + e.pageY); 15: }); 16: $(document).mouseup(function (e) { 17: // on the first click 18: // set the moveTo 19: if (isFirstClick == true) { 20: canvasContext.beginPath(); 21: canvasContext.moveTo(e.pageX - 7, e.pageY - 7); 22: isFirstClick = false; 23: } 24: else { 25: // on subsequent clicks, draw a line 26: canvasContext.lineTo(e.pageX - 7, e.pageY - 7); 27: canvasContext.stroke(); 28: } 29:  30: $('#mousedownCoords').text($('#mousedownCoords').text() + '(' + e.pageX + ',' + e.pageY + ')'); 31: }); 32:  33: function fillBackground() { 34: canvasContext.fillStyle = '#a1b1c3'; 35: canvasContext.fillRect(0, 0, 500, 500); 36: canvasContext.fill(); 37: } 38:  39: function clearCanvas() { 40: // wipe-out the canvas 41: canvas.width = canvas.width; 42: // set the isFirstClick to true 43: // so the next shape can begin 44: isFirstClick = true; 45: // clear the text 46: $('#mousedownCoords').text(''); 47: } 48: })   The script only looks long and complicated, but is not. I’ll go over the main steps. Get a ‘hold’ of your canvas object and retrieve the ‘2d’ context out of it. On mousemove event, write the current x and y coordinates to the ‘currentPosition’ element. On mouseup event, check if this is the first time the user has clicked on the canvas. The coloring of the canvas is done in the fillBackground() function. We first need to start a new path. This is done by calling the beginPath() function on our context. The moveTo() function sets the starting point of our path. The lineTo() function sets the end point of the line to be drawn. The stroke() function is the one that actually draws the line on our canvas. So if you want to play with the demo, here’s how you do it. First click on the canvas (nothing visible happens on the canvas). The second click draws a line from the first click to the current coordinates and so on and so forth. Click on the ‘Clear’ button, to reset the canvas and to give your creativity a clean slate. Here’s a sample output: Happy drawing! Verdict: HTML5 and IE9 – I think we’re on to something big and great here!

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  • How abstract should you get with BDD

    - by Newton
    I was writing some tests in Gherkin (using Cucumber/Specflow). I was wondering how abstract should I get with my tests. In order to not make this open-ended, which of the following statements is better for BDD: Given I am logged in with email [email protected] and password 12345 When I do something Then something happens as opposed to Given I am logged in as the Administrator When I do something Then something happens The reason I am confused is because 1 is more based on the behaviour (filing in email and password) and 2 is easier to process and write the tests.

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  • Object-Oriented Operating System

    - by nmagerko
    As I thought about writing an operating system, I came across a point that I really couldn't figure out on my own: Can an operating system truly be written in an Object-Oriented Programming (OOP) Language? Being that these types of languages do not allow for direct accessing of memory, wouldn't this make it impossible for a developer to write an entire operating system using only an OOP Language? Take, for example, the Android Operating System that runs many phones and some tablets in use around the world. I believe that this operating system uses only Java, an Object-Oriented language. In Java, I have been unsuccessful in trying to point at and manipulate a specific memory address that the run-time environment (JRE) has not assigned to my program implicitly. In C, C++, and other non-OOP languages, I can do this in a few lines. So this makes me question whether or not an operating system can be written in an OOP, especially Java. Any counterexamples or other information is appreciated.

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  • Pair Programming: Pros and Cons

    - by O.D
    Hi I need some experience reporting from the ones who have done pair programming,i notice that lots of people recommend that but my experience was that at one point its more efficient to set alone, think and then write code than to talk with the other programmer (which can be very annoying to other programmers in the same office), do you agree to this? and if yes can you mention situations where pair programing is less efficient than traditional programing? Actually im more interested in Cons than in Pros, but if its your own experience i would like to read both, the Cons and the Pros. I would like to read what you think about the Programmer who does'nt have the keyboard, what can he do in the meanwhile other than talking about the concept? or checking the code on the screen? Thank you

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  • Is there an 'off the shelf' platform for making a new website similar to Elance?

    - by user17747
    I am interested in developing a website that is similar to 'elance' but for a particular vertical. Is there an 'off the shelf' platform you can recommend for getting started with this, or would I need to develop this web service from scratch? When I write 'platform' I am referring to things such as 'shopify' for e-commerce sites, or 'ning' for social websites. I want to create a multi-merchant professional services site. The site would need to support functionality such as: allowing merchants to open and manage their own profile. merchants would accept payments from customers through the site. file transfers between merchants and customers. merchant ratings by customers.

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  • How to stop camera from rotating in 2.5d platformer

    - by Artem Suchkov
    I'm stuck with a problem: I can not make my camera stop rotating after character. What I already have tried: using empty game object with rigid body and locked rotation and make it parent of camera, while player being the parent of object. Also, I've tried using few scripts from web, that did not help. Right now I'm bad with using JS in Unity (can handle JS on website, but I dont know how to integrate it for now) and practicing the basics, making easy 2.5d platformer with basic features, so I can not write code for now.

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  • Disqus-like comment server

    - by wxs
    I'm looking at setting up a blog, and I think I want to go the static website compiler route, rather than the perhaps more conventional Wordpress route. I'm looking at using blogofile, but could use jekyll as well. These tools recommend using disqus to embed a javascript comment widget on blog posts. I'd go that route, but I'd rather host the comments myself, rather than use a third party. I could certainly write my own dirt-simple comment server, but I was wondering if anyone knew of one that already exists (of the open source variety). Thanks!

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  • Set default pulseaudio volume

    - by MrUser
    When I reboot, the volume on the PulseAudio sinks is set to 100%. I know how to change the volume using pactl set-sink-volume, but that is only set temporarily. I could write a script that is run at startup, but it will not be applied if I connect a sink later. (i.e. a Bluetooth speaker) Is there a config file where I can set the default volume that is given to a device when it is first loaded by PulseAudio? Or even the master volume at startup? Clarification: The application is for a headless linux box, so the system shouldn't have to be rebooted and should be able to accept new devices without having to connect via ssh to adjust volumes, etc.

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  • SEO. dofollow trackback or nofollow trackback?

    - by Ernesto Marrero
    Thinking about SEO. It is better that they are dofollow trackback or nofollow trackback? When I write a post on my blog and automatically sends trackback to my site from http://bitacoras.com. The above link is dofollow. Is it advisable to give relevance to this link I also handing dofollow link? For example any domain. on the homepage has pagerank 3. This site has a pagerank 0 internal page that I send trackbacks. It is convenient to send dofollow link to that page to increase your pagerank. Increase my pagerank if I perform this operation ?works well ? Please appreciated.any reference in writing .

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  • Artificial Intelligence implemented in x86 Assembly? [closed]

    - by Bigyellow Bastion
    Okay, so I decided that for my upcoming operating system, I do basically everything in x86 Assembly, using only 16-bit mode. I will need to write the software to host on it once I have something up and going, and I'll definitely post the source and VM-executable file. But as for now I'm stuck with the idea of implementing the AI code for some of the games I'm making to host on it. AI in Assembly is tedious, and sometimes almost impossible seeming, especially complex AI(I'm talking SNES Super Mario World 2: Yoshi's Island AI here, by the way, not pong AI). I was thinking that it'd be such a hassle that I'd have to bring a higher-level language to work some of this out here, like maybe C++ or C#, but I'd have to go through more work linking it into a fine binary that my OS will host, and that adds unnecessary work to the table I wanted to avoid(I don't want a complex system, I want everything as bare-bones as possible, avoiding libraries, APIs, and linkable formats for now, to make everything more directly accessible to the kernel's API).

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  • What simple techniques do you use to improve performance?

    - by Cristian
    I'm talking about the way we write simple routines in order to improve performance without making your code harder to read... for instance, this is the typical for we learned: for(int i = 0; i < collection.length(); i++ ){ // stuff here } But, I usually do this when a foreach is not applicable: for(int i = 0, j = collection.length(); i < j; i++ ){ // stuff here } I think this is a better approach since it will call the length method once only... my girlfriend says it's cryptic though. Is there any other simple trick you use on your own developments?

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  • Disqus-like comment server

    - by wxs
    Hi all, I'm looking at setting up a blog, and I think I want to go the static website compiler route, rather than the perhaps more conventional Wordpress route. I'm looking at using blogofile, but could use jekyll as well. These tools recommend using disqus to embed a javascript comment widget on blog posts. I'd go that route, but I'd rather host the comments myself, rather than use a third party. I could certainly write my own dirt-simple comment server, but I was wondering if anyone knew of one that already exists (of the open source variety). Thanks!

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  • Web-based CMS for mobile app

    - by JWood
    I'm just about to start developing a mobile app which needs to be fed from a CMS. I started designing the tables when I thought there must be something out there which could save me a load of time and let me concentrate on the mobile side of things. So, I'm looking for a CMS that will let me create hierarchical "pages" which will just be 4-5 database fields with a simple front-end to allow to edit and update them. I don't mind having to write some code to layout the database and forms etc, any saving on starting from scratch would be good. The only requirement is that I be able to access the data via some sort of web service, REST, JSON, XML, anything really... Can anyone suggest anything that might help? Thanks, J

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  • Computacenter first partner to offer Oracle Exadata proof-of-concept environment for real-world test

    - by kimberly.billings
    Computacenter (http://www.computacenter.com/), Europe's leading independent provider of IT infrastructure services, recently announced that it is the first partner to offer an Oracle Exadata 'proof-of concept' environment for real-world testing. This new center, combined with Computacenter's extensive database storage skills, will enable organisations to accurately test Oracle Exadata with their own workloads, clearly demonstrating the case for migration. For more information, read the press release. Are you planning to migrate to Oracle Exadata? Tell us about it! var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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  • Marketing texts for freelance programmers [closed]

    - by chiborg
    I'm a freelance developer and would like to set up a website that describes my services. When trying to come up with texts for the web site I got a severe case of writers block. I know that I'd like to describe what I do (websites, CMS, web-based applications), the different stages of projects (analysis, contract, prototype, testing, improvement, delivery, payment, etc) and who the target audience is (owners of small to medium businesses). But I have this feeling that there are some rules/tips on how to write such texts and I don't know them - any pointers?

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  • How to start competitive programming?

    - by Vaibhav Agarwal
    I am practicing coding for a while but the problem is that it takes me a lot of time to write a solution for the problems. I want to ask if competitive programming can help me in improving this? If yes, then how should I start and from what site like TopCoder? I would obviously won't be able to solve very hard problems for now. What should I do? If no, what else should I do? I also have another problem that I want to learn coding but the thing is that I feel that I am not very good at it. What should I do? It's like bugging me from inside. I know some people may not find this question informative but please at least allow me to get an answer.

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  • Enabling Multi-touch features of the Apple Magic Mouse on Ubuntu 12.04

    - by Martin
    I want to write a simple app that uses Apple's Magic Trackpad, nothing special, just so that it recognizes atleast one gesture. The thing is, Ubuntu itself doesnt really recognize this device. I'm using Ubuntu 12.04 and by default the device works with 1 finger, but without tap-click or doubletap, 3 fingers move the window and 3 finger spread makes it fullscreen. I managed to enable 2 finger scrolling with "xinput set-prop 8 'Two-Finger Scrolling' 1 1", but thats about it. No other gestures work, ginn doesnt start, giesview detects the device but doesnt respond to any of the gestures, and touchegg doesnt start either. I tried example apps from qt that come with ubuntu but they dont work. So... what do i do? i tried using qt but all i get from the app is "Got touch without getting TouchBegin for id XX" what else can i use to get my app to work with multitouch devices?

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  • How to start contributing to Unity?

    - by Mad-scientist
    I just forked the source code of Unity. I am new to contributing to the project. Do unity developers use any specific IDE? I am asking this because I am confused about where to start and how exactly do I check a change after I do it? Should I recompile entire natty? If so, then how? I know I am asking a lot of questions, but it would be really helpful if someone could write some kind of beginner friendly introduction to unity development.

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  • monotouch 2d pixel with correct resolution

    - by acidzombie24
    I am writing up a game that is size sensitive. It needs to be pixel perfect. I believe the resolution is 480x320 pixels with the iphone being twice the width and height. My code is grid based with images exactly 16x16pixels. I found samples of opengl in the past but I never found any good tutorial that had 0,0 the top left and was the correct size in resolution (which made images look terrible) What can I use? I'd like to write the code in C# (or C++ but C# is preferred) and use monotouch. I don't know any libraries for 2d graphics. I'll figure out sound and such afterwards and I seen documentation on monotouch for input.

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  • Include Method Extension for IObjectSet What about the mocks?

    Eager loading with Entity Framework depends on the special ObjectQuery.Include method. We’ve had that from Day 1 (first version of ef). Now we use ObjectSets in EF4 which inherit from ObjectQuery (thereby inheriting Include) and also implement IObjectSet. IObjectSet allows us to break the queries apart from ObjectQuery and ObjectContext so we can write persistent ignorant, testable code. But IObjectSet doesn’t come with the Include method and you have to create an extension method to...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • org.openide.awt.ColorComboBox

    - by Geertjan
    It's the time of year when a lot of NetBeans Platform tutorials are being reviewed, revised, and rewritten. Today I'm looking at the NetBeans Platform Paint Application Tutorial. Suddenly I remembered seeing something in a recent API Changes document about a new class, ColorComboBox. That means I can make the tutorial a lot simpler, since Tim Boudreau's external ColorChooser.jar is now superfluous. Here's what the ColorComboBox looks like: It works perfectly. Of course, the nice thing about using that JAR was that it showed the user how to incorporate external JARs, but I'll make sure to make a note of that in the tutorial, along the lines of "If you don't like the NetBeans Platform color combobox, and would like to replace it with your own, such as Tim's ColorChooser.jar or a JavaFX color chooser, take the following steps." In short, if you're using NetBeans APIs, write this on your ceiling above your bed: http://bits.netbeans.org/dev/javadoc/apichanges.html, check that page regularly (mark it in your calendar to do first thing every Monday morning) and you'll be aware of the latest changes as they happen.

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