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• What's the most efficient way to find barycentric coordinates?

  - by bobobobo

  In my profiler, finding barycentric coordinates is apparently somewhat of a bottleneck. I am looking to make it more efficient. It follows the method in shirley, where you compute the area of the triangles formed by embedding the point P inside the triangle. Code: Vector Triangle::getBarycentricCoordinatesAt( const Vector & P ) const { Vector bary ; // The area of a triangle is real areaABC = DOT( normal, CROSS( (b - a), (c - a) ) ) ; real areaPBC = DOT( normal, CROSS( (b - P), (c - P) ) ) ; real areaPCA = DOT( normal, CROSS( (c - P), (a - P) ) ) ; bary.x = areaPBC / areaABC ; // alpha bary.y = areaPCA / areaABC ; // beta bary.z = 1.0f - bary.x - bary.y ; // gamma return bary ; } This method works, but I'm looking for a more efficient one!

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• Is this the right strategy to convert an in-level order binary tree to a doubly linked list?

  - by Ankit Soni

  So I recently came across this question - Make a function that converts a in-level-order binary tree into a doubly linked list. Apparently, it's a common interview question. This is the strategy I had - Simply do a pre-order traversal of the tree, and instead of returning a node, return a list of nodes, in the order in which you traverse them. i.e return a list, and append the current node to the list at each point. For the base case, return the node itself when you are at a leaf. so you would say left = recursive_function(node.left) right = recursive_function(node.right) return(left.append(node.data)).append(right);` Is this the right approach?

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• Are there any examples of a temporal field/object updater?

  - by Bryan Agee

  The system in question has numerous examples of temporal objects and fields--ones which are a certain variable at a certain point in time. An example of this would be someone's rate of pay--there are different answers depending on when you ask and what the constraints might be; eg, can there ever be more than one of a certain temporal object concurrently, etc. Ideally, there would be an object that handles those constraints when a new state/stateful object is introduced; when a new value is set, it would prevent creating negative ranges and overlaps. Martin Fowler has written some great material on this (such as this description of Temporal Objects) , but what I've found of it tends to be entirely theoretic, with no concrete implementations. PHP is the target language, but examples in any language would be most helpful.

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• Silverlight Cream Monday WP7 App Review # 1

  - by Dave Campbell

  I'm going to try something here... if it seems useful, I'll continue, if it doesn't, I'll stop... so give me feedback! There are *lots* of Apps in the WP7 Marketplace, and heaven help me, but the Marketplace sucks for finding stuff. I won't rehash what's already been said in the blogs, but I agree with one and all. I went out last Saturday to find 2 apps that I knew were released, and couldn't do so on my device. Even in the Zune app, it took quite a while to find them... ok, I'll back off a bit, because I just found out I can do 'Search' now if I know the name... I didn't think that was working before. So my thought is on Monday (like today), I will post a review of 5 apps/games I either use or have played with on my device. These are strictly my opinions, you understand, but hey... it's better than a poke in the eye with an iPhone! A few disclaimers:     Feel free to write me about your app and tell me about it. While it would be very cool to receive a whole bunch of xap files to review, at this point, for technical reasons, I'm unable to side-load my device. Since I plan on only doing this one day a week, and only 5, I may never get caught up, so if you send me some info, be patient. Re: games ... remember I'm old... I'm from the era of Colossal Cave and Zork. Duke-Nukem 2D and Captain Comic were awesome. I don't own an XBOX or any other game system, so take game reviews from my perspective -- who knows, it may be refreshing :) I won't pay for an app or game just to try it. If you expect me to test-drive your app, it's going to have to have a Free Trial. In this Issue:   Jingo! is the first app I bought, just to see what the experience was like. It's very much like a game we used to play in school in the Army in 1971 on paper we passed around. Sort of a cross between hangman and Mastermind, you try to figure out the hidden word in 5 tries. You get really good at 5-letter words after a while. I like this because you have to think, and you're not pressured by a clock Jingo! is by James Furdell and is $1.99 I reviewed René Schulte's Pictures Lab a while back, and have not changed my mind. This is an excellent app for playing with any photo on your device... one you've just taken, one you've synced from your PC, or one you've saved from email. I like this because you can get some cool effects for your photos, and it just works. Pictures Lab is by Schulte Software Development and is $1.99 Since I work as a consultant, and from home, I wanted something I could track my time with. I've test-driven all the contenders I could find so far on the phone, and so far I like ONTRACK! the best. If asked, I have some suggestions, but it's probably just the way I work or think. What I do like is I can tap a project to start/stop/restart a counter, and at the end of the day it shows me how much time I've been working. If there's a way to make an adjustment in case you forget to tap the counter, I don't know how to do it, and that's my biggest complaint. I like this because you can get a daily readout which you can also email as a spreadsheet. The daily results display is very good. ONTRACK! is by Qmino and is $2.99 Remember Item 4 above... I've been playing guitar for 48 years... obviously since before the invention of 'tuners', so I'm not as dependent upon these as some folks are. I've tried some in the past and have always felt I can do just as good by ear (I have perfect relative pitch). So, I gave this app by András Velvárt a dance just to see how it works, and it is surprisingly good. If you're used to one of the stage tuners this may take a little getting used to, but it does the job. The difference with this one is there is no real 'null' point inside which you can think your guitar is in tune. The soundwave stays visible on the device, and if it's moving to the right, your string is flat, if it's moving to the left, your string is sharp. Getting it exact might be tricky, but it is exact! If you need to rely on a tuner, this is a good choice in my opinion, exactly because of the sensitivity.. tune up with this and you're dead-on. Guitar Tuner is by Kinabalu Innovation Limited and is $0.99 Popper 2 is the WP7 version of a wildly popular game by Bill Reiss named Dr. Popper. You can get a trial, or you can now get a free lite version of the game. Popper 2 is a fast-paced bubble breaker game. I find it something fun to play when I just want to buzz out, but maybe the best review is that my daughter didn't want to give my phone back when I showed it to her, and always wants to grab my phone to play 'that game'. A fun distraction with great graphics and a great price Popper 2 is by Blue Rose Systems, LLC and is $1.29 Let me know what you think of the idea of doing reviews, or the layout/whatever, and Stay in the 'Light!   Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• What is the best Video Conference integrated solution for Us? [closed]

  - by Andrei B

  we are trying to integrate a simple Video Conferencing (open source) solution into our existing application which is written in C++ and it runs on Linux. I am currently looking at using Ekiga (formely known as GnomeMeeting) or Homer Conferencing (short: Homer). My plan is to "integrate" an existing Video Conferencing client into our existing software. Please give me recommendation on which 3rd party application or library to use to add video conferencing feature to our application. PS: Please don't close this question. I asked it on StackOverflow and it got closed, so where am I supposed to ask this question? If not here, then whats the point of asking lol.

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• migrating PR / rankings from one site to another

  - by sam

  Ive got a clients company site with decent PR, backlinks and search engines rankings. The client wants to change their comapany name and therfore URL, i will set up a rediect between the old site and the new site. But i was wandering is their a way to tell Google that they are moving while retaining all your rankings ? It is the same people, services, office building same everything just rebranded under a different name and url. Additionaly if their is a way to do this, how does google stop you buying expired domains and just pointing them onto your site, for instance i could buy several PR3 domains all relating to the same sector and point them at my site or would google catch on to this ?

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• What are the pro/cons of Unity3D as a choice to make games ?

  - by jokoon

  We are doing our school project with Unity3d, since they were using Shiva the previous year (which seems horrible to me), and I wanted to know your point of view for this tool. Pros: multi platform, I even heard Google is going to implement it in Chrome everything you need is here scripting languages makes it a good choice for people who are not programming gurus Cons: multiplayer ? proprietary, you are totally dependent of unity and its limit and can't extend it it's less "making a game from scratch" C++ would have been a cool thing I really think this kind of tool is interesting, but is it worth it to use at school for a project that involves more than 3 programming persons ? What do we really learn in term of programming from using this kind of tool (I'm ok with python and js, but I hate C#) ? We could have use Ogre instead, even if we were learning direct x starting january...

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• Physics System ignores collision in some rare cases

  - by Gajoo

  I've been developing a simple physics engine for my game. since the game physics is very simple I've decided to increase accuracy a little bit. Instead of formal integration methods like fourier or RK4, I'm directly computing the results after delta time "dt". based on the very first laws of physics : dx = 0.5 * a * dt^2 + v0 * dt dv = a * dt where a is acceleration and v0 is object's previous velocity. Also to handle collisions I've used a method which is somehow different from those I've seen so far. I'm detecting all the collision in the given time frame, stepping the world forward to the nearest collision, resolving it and again check for possible collisions. As I said the world consist of very simple objects, so I'm not loosing any performance due to multiple collision checking. First I'm checking if the ball collides with any walls around it (which is working perfectly) and then I'm checking if it collides with the edges of the walls (yellow points in the picture). the algorithm seems to work without any problem except some rare cases, in which the collision with points are ignored. I've tested everything and all the variables seem to be what they should but after leaving the system work for a minute or two the system the ball passes through one of those points. Here is collision portion of my code, hopefully one of you guys can give me a hint where to look for a potential bug! void PhysicalWorld::checkForPointCollision(Vec2 acceleration, PhysicsComponent& ball, Vec2& collisionNormal, float& collisionTime, Vec2 target) { // this function checks if there will be any collision between a circle and a point // ball contains informations about the circle (it's current velocity, position and radius) // collisionNormal is an output variable // collisionTime is also an output varialbe // target is the point I want to check for collisions Vec2 V = ball.mVelocity; Vec2 A = acceleration; Vec2 P = ball.mPosition - target; float wallWidth = mMap->getWallWidth() / (mMap->getWallWidth() + mMap->getHallWidth()) / 2; float r = ball.mRadius / (mMap->getWallWidth() + mMap->getHallWidth()); // r is ball radius scaled to match actual rendered object. if (A.any()) // todo : I need to first correctly solve the collisions in case there is no acceleration return; if (V.any()) // if object is not moving there will be no collisions! { float D = P.x * V.y - P.y * V.x; float Delta = r*r*V.length2() - D*D; if(Delta < eps) return; Delta = sqrt(Delta); float sgnvy = V.y > 0 ? 1: (V.y < 0?-1:0); Vec2 c1(( D*V.y+sgnvy*V.x*Delta) / V.length2(), (-D*V.x+fabs(V.y)*Delta) / V.length2()); Vec2 c2(( D*V.y-sgnvy*V.x*Delta) / V.length2(), (-D*V.x-fabs(V.y)*Delta) / V.length2()); float t1 = (c1.x - P.x) / V.x; float t2 = (c2.x - P.x) / V.x; if(t1 > eps && t1 <= collisionTime) { collisionTime = t1; collisionNormal = c1; } if(t2 > eps && t2 <= collisionTime) { collisionTime = t2; collisionNormal = c2; } } } // this function should step the world forward by dt. it doesn't check for collision of any two balls (components) // it just checks if there is a collision between the current component and 4 points forming a rectangle around it. void PhysicalWorld::step(float dt) { for (unsigned i=0;i<mObjects.size();i++) { PhysicsComponent &current = *mObjects[i]; Vec2 acceleration = current.mForces * current.mInvMass; float rt=dt; // stores how much more the world should advance while(rt > eps) { float collisionTime = rt; Vec2 collisionNormal = Vec2(0,0); float halfWallWidth = mMap->getWallWidth() / (mMap->getWallWidth() + mMap->getHallWidth()) / 2; // we check if there is any collision with any of those 4 points around the ball // if there is a collision both collisionNormal and collisionTime variables will change // after these functions collisionTime will be exactly the value of nearest collision (if any) // and if there was, collisionNormal will report in which direction the ball should return. checkForPointCollision(acceleration,current,collisionNormal,collisionTime,Vec2(floor(current.mPosition.x) + halfWallWidth,floor(current.mPosition.y) + halfWallWidth)); checkForPointCollision(acceleration,current,collisionNormal,collisionTime,Vec2(floor(current.mPosition.x) + halfWallWidth, ceil(current.mPosition.y) - halfWallWidth)); checkForPointCollision(acceleration,current,collisionNormal,collisionTime,Vec2( ceil(current.mPosition.x) - halfWallWidth,floor(current.mPosition.y) + halfWallWidth)); checkForPointCollision(acceleration,current,collisionNormal,collisionTime,Vec2( ceil(current.mPosition.x) - halfWallWidth, ceil(current.mPosition.y) - halfWallWidth)); // either if there is a collision or if there is not we step the forward since we are sure there will be no collision before collisionTime current.mPosition += collisionTime * (collisionTime * acceleration * 0.5 + current.mVelocity); current.mVelocity += collisionTime * acceleration; // if the ball collided with anything collisionNormal should be at least none zero in one of it's axis if (collisionNormal.any()) { collisionNormal *= Dot(collisionNormal, current.mVelocity) / collisionNormal.length2(); current.mVelocity -= 2 * collisionNormal; // simply reverse velocity along collision normal direction } rt -= collisionTime; } // reset all forces for current object so it'll be ready for later game event current.mForces.zero(); } }

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• Google is not treating two Austrailian schools as separate sites when both are subdomains of qld.edu.au

  - by LuckySpoon

  My question relates to two websites, each of which is a "Calvary Christian College", however in two totally different locations and unrelated to each other entirely (except by name, and domain). All schools in the state are issued a .qld.edu.au, in this case calvary.qld.edu.au and calvarycc.qld.edu.au. Now what's interesting is that these domains are crossing each other in sitelinks for searches such as "calvary christian college townsville" (if you check the sitelinks 2/6 are to a different domain). I've put a demotion in for this ages ago (we control calvary.qld.edu.au), however we're seeing no change on the results page. I have been able to get the owners of calvarycc.qld.edu.au to submit demotions for our domain, which should go in sometime this week. What can we do to tell Google that these websites are not interchangeable, despite both appearing as "subdomains" of qld.edu.au. We can possibly open channels of communication with the administrators of qld.edu.au but will need to tell them what we need to change, and at this point I'm out of ideas.

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• At what visitor share do you stop supporting a given browser?

  - by adam

  I'm lead dev for a large website which has a higher than average percentage of IE6 users - about 4.4% of our audience. Our new version is going to make use of progressive enhancement - including transitions and effects as well as rounded corners, gradients, web fonts and other CSS techniques. Obviously there are cross-browser ways to achieve most of these things which require various amounts of work to implement. What I'm currently looking into - and what I'd like your experiences of - is how to decide at what point we draw the line between providing an enhanced experience vs just supporting the functionality. FYI, I believe that this question meets the six guidelines for great subjective questions as defined in the FAQ. I'm after answers detailing why and how, not too short, with constructive comments, experiences, facts and references. Thanks! Adam

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• Choosing a subject to create a site for

  - by Daniel

  For 6 years I'm working as web developer and I would like to finally create my own site. I thought I have everything needed: programming and administration skills, found a good designer, own servers and understanding how to operate site. But I've missed very important (or the most important) point: how do I find a subject for my site? My hobby and my work are the same: IT, but I don't want to create just another tech blog or news aggregator, I want something different. First I thought things like Google Trends or Google top 1000 could help, but I've got lost in thousands of options I can't see them all (I actually can, but it'll take at least a couple of month). So my question is: how did you start? Where did you get the idea?

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• Move site from one tld to another

  - by Amol Ghotankar

  If we want to move site from say xyz.com to xyz.org. What all things we need to do to make sure seo works fine. I am doing something like Point both xyz.com and xyz.org to same ip where my site is working Use cannonical url to have xyz.org/* instead of xyz.com/* Add site to webmaster and make a change request. But problem is we are not able to 301 redirect from xyz.com to xyz.org as both are on same i/p and doing so is causing redirect loop and error. How to fix this? Please help.

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• What Is StreamInsight? A Primer for Non-Programmers

  - by Roman Schindlauer

  Are you trying to figure out whether StreamInsight might be something you could use, but you’re having trouble sifting through all the programming jargon that’s used to describe it? StreamInsight is, ultimately, a set of programming tools, and at some point it takes a programmer to implement a StreamInsight solution. But it really should be possible to get a handle on what StreamInsight is all about even if you’re not a programmer yourself. A new article published in the TechNet Wiki may be able to help: StreamInsight for Non-Programmers. It gives an overview of the technology, but it leaves out the C# references and relates StreamInsight to more familiar SQL databases and queries. Check it out. When you’re done there and are ready to dig a little deeper, take a look at Get Started with StreamInsight 2.1. That article should help you navigate through the StreamInsight official documentation and other resources. And, as always, you can post questions or comments here or on the TechNet Wiki. Regards, The StreamInsight Team

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• PHP Script for selling software online

  - by jaypabs

  I am planning to build an ecommerce site that allow my members (including me) to upload source code and sell it online. I am thinking of creating it from scratch using codeigniter. But I am also looking for ready made script that is available online whether it is free or not. The script should have a similar functionality as binpress.com or codecanyon.net. Can anybody point to so such website that sells this kind of script? The script should be not encrypted to I can add more features if I like. Thank you

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• blurry lines between web application context layer, service layer and data access layer in spring

  - by thenaglecode

  I Originally asked this question in SO but on advice I have moved the question here... I'll admit I'm a spring newbie, but you can correct me if I'm wrong, this one liner looks kinda fishy in a best practices sort of way: @RepositoryRestResource(collectionResourceRel="people"...) public interface PersonRepository extends PagingAndSortingRepository<Person, Long> For those who are unaware, the following does many things: It is an interface definition that can be registered in an application context as a jpa repository, automagically hooking up all the default CRUD operations within a persistence context (that is externally configured). and also configures default controller/request-mapping/handler functionality at the namespace "/people" relative to your configured dispatcher servlet-mapping. Here's my point. I just crossed 3 conceptual layers with one line of code! this feels against my seperation-of-concern instincts but i wanted to hear your opinion. And for the sake of being on a question and answer site, I would like to know whether there is a better way of seperating these different layers - Service, Data, Controllers - whilst maintaining as minimal configuration as possible

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• Is it risky to install KDE on Ubuntu alongside Unity and Gnome?

  - by Vagrant232

  The last time I installed KDE and Gnome on the same OS (Opensuse 12.1), GDM and KDM started conflicting and they both stopped working properly and I was plagued with applications from both environments till the point the applications overview in gnome was flooded with useless KDE trash. Moreover, I still had parts of the KDE desktop appearing when I'm running Gnome (such as the password manager and kde fonts and some apps refused to give up the oxygen theme). If I install the plasma-desktop package on Ubuntu, am I at risk of having such issues? I just want KDE with the bare minimum number of applications; just the necessary ones to make things work. I'd rather not have dolphin installed either. Also, is it all right to install the kde-standard pack? Or should I just stick to the plasma-desktop pack?

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• Deferred Open Source licensing

  - by Thomas W.

  Are there established models for releasing an initially proprietary piece of software under FLOSS conditions after a defined period or a certain point of time? The main problem here is that all parties involved must be able to trust that the Open Source licensing will actually take place at the defined time and no party can further defer or cancel this process. Clearly such a model has its problems, for example it's problematic to deal with contributions from "outside", legally and technically. Ghostscript is a prominent example where a deferred model has been used and abandoned. However, if certain parties involved will insist on keeping the software proprietary, at least for a certain period of time, then the only options are a deferred Open Source licensing model or no Open Source licensing at all. I think I read about services that serve as trusted parties who take care of Open Sourcing the software. However, I was not successful in spotting any of those.

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• Need Japanese IME with Dvorak keyboard with 13.10

  - by user916792

  I recently did a fresh install of 13.10 and enabled Japanese language support. In the past this seemed to work seamlessly with my other keyboard settings when I set up my Dvorak keyboard. But this time when I toggle the IME on it uses the standard QWERTY layout. Typing English uses the Dvorak layout as I expect. This just worked for me in the past to the point where I stopped paying attention to what the underlying IME is and I don't recall any special steps other then choosing my keyboard layout and enabling Japanese. Any help would be appreciated!

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• Design for future changes or solve the problem at hand.

  - by Naveen

  While writing the code or during design do you try to generalize the problem at the first instance itself or try to solve that very specific problem. I am asking this because, trying to generalize the problem tends to complicate the things (which may not be necessary) and on the otherhand it will be very difficult to extend the specific solution if there is a change in the requirement. I guess the solution is to find the middle path which is easier said than done. How do you tackle this type of problem ? If you start generalizing it at what point of time you know that this much of generalization is sufficient ?

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• Simple question about a cocos2d based game template

  - by Zishan

  I am learning a cocos2d based Game template tutorial from here and now I am at this point of the tutorial. My question is, how can i run 30 different scenes in 30 different levels of 5 chapter? Now I am using this switch (gameData.selectedLevel) { case 1: [SceneManager goChapter1Level1Scene]; break; (... snip a whole lot of lines...) case 30: [SceneManager goChapter5Level6Scene]; break; default: break; } in the "- (void) onPlay: (CCMenuItemImage*) sender" method. But it work only for 6 levels scene of chapter1. Other 4 chapters levels are show as same as 1st chapter levels scene. they are not show their own level scene. can any one please teach me, how can I do this stuff using this game template?

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• Do logged in users need to browse a site over https?

  - by Luke

  I've never thought it was necessary, but a client has requested that all webpages served to logged in users be delivered over HTTPS. Aside from the implementation standpoint, which I don't think I'm going to pursue is there any real reason for this request ? For clarity, the login / logout process, account settings, registration preferences and all user related scripts are served over https. but I can't see the point in my news articles, press releases, events etc... being served in this manner? Am I missing something ?

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• What do you use to bundle / encrypt data?

  - by David McGraw

  More and more games are going the data driven route which means that there needs to be a layer of security around easy manipulation. I've seen it where games completely bundle up their assets (audio, art, data) and I'm wondering how they are managing that? Are there applications / libraries that will bundle and assist you with managing the assets within? If not is there any good resources that you would point to for packing / unpacking / encryption? This specific question revolves around C++, but I would be open to hear how this is managed in C#/XNA as well. Just to be clear -- I'm not out to engineer a solution to prevent hacking. At the fundamental level we're all manipulating 0's and 1's. But, we do want to keep the 99% of people that play the game from simply modifying XML files that are used to build the game world. I've seen plenty of games bundle all of their resources together. I'm simply curious about the methods they're using.

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• Windows no longer display with proprietary ATI Catalyst drivers

  - by Insomniac

  I recently started having an issue that opening any application would would show nothing on screen. At the time I noticed it I assumed it was an incompatibility between the new 14 update so reinstalled the old 13.10 iso I used originally. I have now tried a range of ATI drivers including the latest and the exact file I installed the first time with the same results. I can only assume then that it is one of the updates applied at some point, but have no idea which one or how I would go about rolling these back or getting earlier versions of packages. Is anyone else getting this issue? The system has 2 ati 6850s installed, not in crossfire. The open source drivers work fine but I need the ATI ones for cgminer to work.

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• should i concentrate on logical and puzzles part in programming, i want to be a web (flex)developer?

  - by abhilashm86

  I'm a student not good and can't easily crack at more puzzle, complex mathematics, hard logic problems? in college i studied c++, java, oops. I'm comfortable with all syntax and writing programs and using API's and doing mashups, i can do.......... but once a friend asked help on coding contest, i was in dilemma and frustration? It was simple and complex, i could not write code for those, so got scared? Is logical ability,complex mathematics, puzzles required for a developer point of view? please help and suggest methods to achieve things......

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• Using env variables with RewriteRule and ErrorDocument

  - by misterte

  Hi, I'm having problems with the following while config. my Apache server to Rewrite some urls. SetEnv PATH_TO_DIR /directory RewriteRule ^%{PATH_TO_DIR}/([a-zA-Z0-9_\-]+)/([a-zA-Z0-9_\-\.]+)/?$ /index.php?dir=$1&file=$2 ErrorDocument 404 %{PATH_TO_DIR}/index.php?dir=null&file=error This conf. used to work perfectly fine until I used SetEnv PATH... etc. I need to use this because there are lots of rules, not just those. Can anyone point out my mistake? Apache returns %{PATH_TO_DIR}/index.php?dir=null&file=error when I try anything (www.site.com/foo/bar for instance). Apache returns the ErrorDocument if i just try to fetch the index. I know it's not a problem with the rewrite rules because they work when I remove the PATH_TO_DIR variable and just hard code it. Thanks! A.

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