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• Triple-head on a Lenovo T520

  - by codeape

  Lenovo T520 with integrated Intel HD graphics + a NVidia card (Optimus) Ubuntu 11.10 on the computer. I would like to use the built-in screen plus two external screens. This PDF indicates that it is possible to connect up to four external monitors to the laptop. The information is Windows only. I was planning to disable the NVidia card, since I have read that Linux support for Optimus is not good. Questions: Has anyone set up three monitors on NVidia hardware? Has anyone set up three monitors using Intel HD 3000? Can I expect it to work out of the box, or are there tricks I need to be aware of?

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• unit testing variable state explicit tests in dynamically typed languages

  - by kris welsh

  I have heard that a desirable quality of unit tests is that they test for each scenario independently. I realised whilst writing tests today that when you compare a variable with another value in a statement like: assertEquals("foo", otherObject.stringFoo); You are really testing three things: The variable you are testing exists and is within scope. The variable you are testing is the expected type. The variable you are testing's value is what you expect it to be. Which to me raises the question of whether you should test for each of these implicitly so that a test fail would occur on the specific line that tests for that problem: assertTrue(stringFoo); assertTrue(stringFoo.typeOf() == "String"); assertEquals("foo", otherObject.stringFoo); For example if the variable was an integer instead of a string the test case failure would be on line 2 which would give you more feedback on what went wrong. Should you test for this kind of thing explicitly or am i overthinking this?

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• DotNetNuke 5.3.1 Version now entering QA.

  With any software product you will occasionally have a release that you wish you could take back. Microsoft had Windows Vista, and Tuesday we had DotNetNuke 5.3.0. We had a couple of significant bugs which slipped through the QA process and which resulted in a major impact to customers. Rather than continue to compound the problem we have made the decision to pull the 5.3.0 packages from CodePlex and from DotNetNuke Support Network while we test a 5.3.1 release which we expect to release early next...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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• RenderTarget2D behavior in XNA

  - by Utkarsh Sinha

  I've been dabbling with XNA for a couple of days now. This chunk of code doesn't work as I expect. The goal is to render sprites individually and composite them on another rendertarget. P = RenderTarget2D(with RenderTargetUsage.PreserveContents) D = RenderTarget2D(with RenderTargetUsage.DiscardContents) for all sprites: graphicsDevice.SetRenderTarget(D); <draw sprite i> graphicsDevice.SetRenderTarget(P); <Draw D> graphicsDevice.SetRenderTarget(null); <Draw P> The result I get is - only the last sprite is visible. I'm sure I'm missing some piece of information about RenderTarget2D. Any hints on what that might be? Cross posted from - http://stackoverflow.com/questions/9970349/weird-rendertarget2d-behaviour

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• What should I use (controls, methods) to make a 2D tile based map editor?

  - by user1306322

  I'm making a 2d game where each tile is a square and it's viewed at straight angle, no skewing, no rotation, it's pretty simple. Two weeks ago I tried using DataGridView, but as the number of rows and columns increased, it became frustratingly slow, then I read how it should've happened to me earlier, because this control is not supposed to work with large number of cells, and I have at least 7500 cells in my smallest level, which made it unbearable to use. This is what I expect from my new editor: Most importantly, tile type. Tile images or their color codes are fine (seeing map as it is in-game is cool, but the faster, the better). Secondly, all tile parameters (in text, preferrably editable in a popup or sidebar). I'm using my own format, so I'm most probably not going to use third party product. Besides, I'm trying to learn how to do it myself.

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• conventions for friend methods in Perl

  - by xenoterracide

  Perl doesn't support a friend relationship between objects, nor does it support private or protected methods. What is usually done for private methods is to prefix the name with an underscore. I occasionally have methods that I think of as friend methods. Meaning that I expect them to be used by a specific object, or an object with a specific responsibility, but I'm not sure if I should make that method public (meaning foo ) or private ( _foo ) or if there's a better convention? is there a convention for friend methods?

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• SF Bay Area Event, November 1st: SPARC 25th Anniversary at Computer History Museum

  - by Larry Wake

  For those of you in the Bay Area, there's going to be what promises to be a very interesting event at the Computer History Museum on Thursday, November 1st at 11 AM: "SPARC at 25: Past, Present and Future". The panel event will feature Sun Microsystems founders Bill Joy and Andy Bechtolsheim, SPARC luminaries such as Anant Agrawal and David Patterson, former Sun VP Bernard Lacroute, plus Oracle executives Mark Hurd, John Fowler and Rick Hetherington. For those of you who can't attend, we expect to have video of the event afterward, but if you can make it in person, this is a unique opportunity to hear from industry pioneers, as well as get insights into future SPARC innovations. Plus, you can see SPARC (and non-SPARC) related exhibits from both the Computer History Museum and the personal collections of some of the panel participants. I hope you can join us; Register today.

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• Where to find clients?

  - by Zenph

  My main area: web development. Of course, I don't expect anybody give away their 'gold mine' or whatever but I am struggling to see where I should be advertising my services. I have one other developer I work with and we have a lot of happy clients - on freelance websites. Thing is, freelance websites just seem to suck the life out of you when you're being out-bidded by ridiculous rates. I want to attract customers who are more concerned about quality and accountability than price. Any suggestions at all? I'm so lost with this. EDIT: Added bounty of 200 - all of my 'reputation'. EDIT: Added second bounty of 50 I did hear of a novel idea. Do work for an opensource project and get featured in their 'trusted developers' section, if they have one. Input?

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• Q2 2010 WinForms roadmap published

  Now that Q1 2010 SP1 has been released, it is time to turn our attention to the Q2 2010 release, which promises to be yet another major milestone for RadControls for WinForms. Here is a trimmed down list of what to expect: RadGridView gets a new major version with numerous improvements and new features. A beta version is expected in mid May; In addition to the several vital improvements in performance and user experience, RadScheduler will deliver appointment reminders; RadListBox and RadComboBox will receive major updates in terms of UI, user experience, performance, and data handling. For further details visit the RadControls for WinForms Q2 2010 roadmapDid 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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• A pixel is not a pixel is not a pixel

  Yesterday John Gruber wrote about the upped pixel density in the upcoming iPhone (960x480 instead of 480x320), and why Apple did this. He also wondered what the consequences for web developers would be.Now I happen to be deeply engaged in cross-browser research of widths and heights on mobile phones, and can state with reasonable certainty that in 99% of the cases these changes will not impact web developers at all.The remaining 1% could be much more tricky, but I expect Apple to cater to this problem...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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• SOLID Principles and code structure

  - by S-Unit

  My question is on SOLID principles, because I couldn't answer a question (beyond the obvious meaning of the various principles of SOLID) at an interview and it really bugs me. I have done a couple of days worth of digging around and have yet to come up with a satisfactory summary. The question was: If you were to look at a .Net project that I told you strictly followed SOLID principles, what would expect to see in terms of the project and code structure ? I sort of floundered around a bit, didn't really answer the question and then bombed out. Any help or thoughts will really be appreciated.

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• C# XNA - Sky Sphere Question

  - by Wade

  I have been banging my head against the wall trying to get a sky sphere to work appropriately in XNA 4.0. I have the sphere loading correctly, and even textured, but i would like something a little more dynamic that can support a day/night cycle. My issue is that, while i know a good amount of C# and XNA, i know next to nothing about HLSL. (I could make an ambient light shader if my life depended on it...) I also have not been able to find a tutorial on how to build a sky sphere like this. Of course i don't expect to be able to make an amazing one right off the bat, i would like to start small, with a dynamic coloring sky i'll work out the clouds and sun later. My first question: Does anyone know of any good tutorial sites that could help me get a decent grasp around HLSL? Second: Does anyone have a good example of or know where to find one of a gradient sky using XNA and C#?

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• Join us! Oracle Manufacturing Industries Forum, Chicago Thurs. Nov.14'13

  - by Stephen Slade

  The 6th Annual Oracle Manufacturing Industries Forum will take place in Chicago, Thurs, Nov.14 '13. Executives from successful global manufacturing companies will address key themes including: Value Chain Transformation, Owning the Customer Service Experience, Sales and Operations Planning in a Global Enterprise Supply Chain, and Modernizing the Manufacturing Enterprise. Join us for what we expect to be one of the industry's most informative and provocative executive events of the year. Event Objectives: Create an environment where executives can interact with their peers to discuss current issues Brainstorm and discuss how attendees can use technology to transform their organizations Share best practices and learn through the experiences of industry peers Where: Westin Chicago River North,  320 North Dearborn St,  Chicago, IL 60654 Evite: http://www.oracle.com/us/dm/229048-nafm13049989mpp074-se-2021171.html Register:   http://eventreg.oracle.com/profile/web/index.cfm?PKWebId=0x25005591a&source=evite Partner Sponsors Include: CSS, Fujitsu, Inspirage, Hitachi Consulting, Lucidity and Rolta Register Now!

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• Why are PHP function signatures so inconsistent?

  - by Shamim Hafiz

  I was going through some PHP functions and I could not help notice the following: <?php function foo(&$var) { } foo($a); // $a is "created" and assigned to null $b = array(); foo($b['b']); var_dump(array_key_exists('b', $b)); // bool(true) $c = new StdClass; foo($c->d); var_dump(property_exists($c, 'd')); // bool(true) ?> Notice the array_key_exists() and property_exists() function. In the first one, the property name(key for an array) is the first parameter while in the second one it is the second parameter. By intuition, one would expect them to have similar signature. This can lead to confusion and the development time may be wasted by making corrections of this type. Shouldn't PHP, or any language for that matter, consider making the signatures of related functions consistent?

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• Performance cost of running Ubuntu from external hard drive

  - by dandan78

  A friend just complained to me about Ubuntu being slow. Although I've noticed a certain lack of snappiness with Linux vs Windows in the past, I really can't say I've had much to grumble about with the recent distributions of Ubuntu. That said, his objections seem much worse than the ones I used to have and I know that his current setup is significantly more powerful than my laptop. And then it turned out he is running Ubuntu off an external HDD hooked up via USB2.0. The HD enclosure is USB3.0 but apparently he can't manage to get it to boot on USB3.0 so he switched to one of the USB2.0 ports or whatever and that works, albeit not very well. Now I would expect USB to add some overhead to communication between the computer and the HDD; SATA is after all designed to get the maximum out of a hard drive, whereas USB is, well, universal. What are your expreriences with booting off external HDDs? Edit: Does anybody know just how much of a slowdown can be expected?

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• How to make a disk image and restore from it later?

  - by torbengb

  I'm a new Linux user. I've reinstalled my Wubi from scratch at least ten times the last few weeks because while getting the system up and running (drivers, resolution, etc.) I've broken something (X, grub, unknowns) and I can't get it back to work. Especially for a newbie like me, it's easier (and much faster) to just reinstall the whole shebang than try to troubleshoot several layers of failed "fixing" attempts. Coming from Windows, I expect that there is some "disk image" utility that I can run to make a snapshot of my Linux install (and of the boot partition!!) before I meddle with stuff. Then, after I've foobar'ed my machine, I would somehow restore my machine back to that working snapshot. What's the Linux equivalent of Windows disk imagers like Acronis True Image or Norton Ghost?

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• Multi-lingual error messages and error numbers

  - by Jon Hopkins

  So we're looking at the possibility of porting our software to support multiple languages and one of the areas we're going to have to deal with is error messages and other notifications. These obviously have to be reported to the users in their own language. Our team (largely) only speak English and even if we were all multi-lingual we're looking at selling to a wide range of countries and could never expect to have a reasonable number of people speaking all languages (we're a small company). The obvious way to get round the language issue when errors or other messages we may get asked about which are being reported is error numbers which would be consistent across language. While these are going to exist in the backend (if only as key on the error message), I'd really rather not throw them at users if we don't have to but I don't have any other solution. Anyone have any useful suggestions for alternatives?

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• U1 music mp3 files not put into albums

  - by david

  Via the web page I can see that my files sync to U1 cloud servers. For the mp3 files, there seems to be a problem that several questions have already addressed but there does not seem to be a clear answer. If I use EasyTAG 2.1.6, I can see the ID3 tags on the local files and they seem to correctly define the artist, album title and track name. I expect it is not relevant, but I am using 10.04 with several different clients to rip the CDs. However, some mp3 files do not appear in the cloud at all and some others get assigned to Various Artist or Unknown artist. Does the music streaming (e.g. via Ipad) use the tags or the directory/file structure to assign the artist or album, and how quickly should it be expected to work? :-) Which version of ID3 tags does U1 music streaming work best with or prefer? thanks for any help David

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• Box2D Platform body not moving player body along with it

  - by onedayitwillmake

  I am creating a game using Box2D (Javascript implementation) - and I added the ability to have a static platform, that is moved along an axis as a function of a sine. My problem is when the player lands on the platform, as the platform moves along the X axis - the player is not moved along with it, as you visually would expect. The player can land on the object, and if it hits the side of the object, it does colide with it and is pushed. This image might explain better than I did: After jumping on to the red platform the player character will fall off as the platform moves to the right UPDATE: Here is a live demo showing the problem: http://onedayitwillmake.com/ChuClone/slideexample.php

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• Good book/resource recommendation for HTML5 mobile game development?

  - by Greg Bala

  The problem: I am taking an existing, 5 year old, html based MMORTS game and "HTML5-ing" it, "AJAX-ing" it and most importantly, optimizing for mobile devices like iPhone, android etc. For these devices, the application will be packaged as a downloadable app that is a wrapper for a browser which actually shows the game.. The Question Looking for a good book, or books, or in-depth articles that would help me learn: what tools I have in iOS, andriod applications for optimizing an html based game. things like caching of images, etc what kind of connectivity, or interactivity I can expect between the html/javascript pages and the wrapper - can I play sounds in the wrapper by triggering them from javascript? etc tip and tricks to optimize html/html5 & Javascript application to run well on mobile devices ETC :) Any recommendations would be greatly appreciated!!

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• How to prepare for the GRE Computer Science Subject Test?

  - by Maddy.Shik

  How do I prepare for the GRE Computer Science subject test? Are there any standard text books I should follow? I want to score as competitively as possible. What are some good references? Is there anything that top schools like CMU, MIT, and Standford would expect? For example, Cormen et al is considered very good for algorithms. Please tell me standard text books for each subject covered by the test, like Computer Architecture, Database Design, Operating Systems, Discrete Maths etc.

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• How to make rigid bodies collide with Apex Clothing in PhysX for Maya

  - by b1nary.atr0phy

  According to the [Apex] Clothing Overview section of the documentation: Colliding with Rigid Bodies Rigid bodies present in your scene will push clothing around roughly as you might expect. Well, I beg to differ. The Apex Cloth collides with the floor just fine, but that's about the only thing it collides with (unless I add ragdoll to the same skeleton that the cloth is attached to.) So for example, if I try to bounce a ball (dynamic rigid body) into the cloth, it simply bounces through it. If I try to walk an actor with ragdoll through it, he simply clips through it as well. Anyone have any insight on this?

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• How to repair ods files

  - by karthick87

  I have few ods files but all of a sudden it is not opening. When i open the file i get the following error. Please look at the below snapshot Error on opening the file with Archive Manager: karthick@karthick:/media/Datas$ zip -FF data.ods --out repaired_file.ods Fix archive (-FF) - salvage what can Found end record (EOCDR) - says expect single disk archive Scanning for entries... copying: mimetype (46 bytes) copying: Configurations2/statusbar/ (0 bytes) copying: Configurations2/accelerator/current.xml (2 bytes) copying: Configurations2/floater/ (0 bytes) copying: Configurations2/popupmenu/ (0 bytes) copying: Configurations2/progressbar/ (0 bytes) copying: Configurations2/menubar/ (0 bytes) copying: Configurations2/toolbar/ (0 bytes) copying: Configurations2/images/Bitmaps/ (0 bytes) copying: content.xml zip warning: no end of stream entry found: content.xml zip warning: rewinding and scanning for later entries

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• Why PHP Function Naming so Inconsistent?

  - by Shamim Hafiz

  I was going through some PHP functions and I could not help notice the following: <?php function foo(&$var) { } foo($a); // $a is "created" and assigned to null $b = array(); foo($b['b']); var_dump(array_key_exists('b', $b)); // bool(true) $c = new StdClass; foo($c->d); var_dump(property_exists($c, 'd')); // bool(true) ?> Notice the array_key_exists() and property_exists() function. In the first one, the property name(key for an array) is the first parameter while in the second one it is the second parameter. By intuition, one would expect them to have similar signature. This can lead to confusion and the development time may be wasted by making corrections of this type. Shouldn't PHP, or any language for that matter, consider making the signatures of related functions consistent?

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• Is it my responsibility to code for errors on a completely separate website and domain when redirecting or doing a single sign on?

  - by kappasims

  If my application is responsible for redirecting/doing a single sign on to a destination managed by a third party, in general, where should I draw the line for error handling during this process? If an error happens on the other application's end, is it reasonable for my stakeholder to expect the application I am working with to share responsibility for handling these scenarios? Notes: I am going to keep solutions limited to those that entail only one request--I am familiar with the "do an xmlhttprequest and see how that fares before doing anything else" approach. I am speaking in terms of an enterprise-level application with fairly decent customer traffic.

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