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• When can I be sure a directed graph is acyclic?

  - by Daniel Scocco

  The definition for directed acyclic graph is this: "there is no way to start at some vertex v and follow a sequence of edges that eventually loops back to v again." So far so good, but I am trying to find some premises that will be simpler to test and that will also guarantee the graph is acyclic. I came up with those premises, but they are pretty basic so I am sure other people figured it out in the past (or they are incorrect). The problem is I couldn't find anything related on books/online, hence why I decided to post this question. Premise 1: If all vertices of the graph have an incoming edge, then the graph can't be acyclic. Is this correct? Premise 2: Assume the graph in question does have one vertex with no incoming edges. In this case, in order to have a cycle, at least one of the other vertices would need to have two or more incoming edges. Is this correct?

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• Upcoming Enhancements in AngularJS Integration in NetBeans IDE

  - by Geertjan

  New bleeding edge enhancements in AngularJS support in NetBeans IDE enable many more controllers to be found than in NetBeans IDE 7.4. The next version of NetBeans IDE parses all JavaScript files and checks for defined AngularJS controllers, such as the below: All recognized AngularJS controllers are offered in code completion, as shown below. In other words, code completion works better in finding AngularJS controllers. Another improvement is in the "Go To Declaration" feature. When you click Ctrl+Mouse over the name of a controller inside an NG-controller directive, you will be navigated to the related controller declaration. More accurate results can be shown in code completion mainly because there are changes in the generation of JavaScript virtual sources in an AngularJS page.

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• America The Vulnerable

  - by Naresh Persaud

  At the Executive Edge this week, Joel Brenner shared his perspective on the state of cyber-security. Today our most critical military and corporate secrets are under attack. In his presentation, Joel shared his perspective on how organizations can can better prepare for the changing security climate. The amount of state sponsored espionage has highlighted weaknesses in our national security infrastructure. The Internet was primarily intended to provide a means of collaboration for non-commercial entities. Today it is the backbone of our digital commerce and digital experience and it was not designed to secure the activities and data we share today.  Check out "America The Vulnerable" and learn more. 

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• Lenovo IdeaPad P400 - Disabling the annoying requirement for the Fn key to use F1-F12

  - by Yon

  On Lenovo laptops, in order to use F5 you need to press Fn-F5 (same with F1-F12). It's really annoying and I'd like to reverse the situation. On Windows, a Lenovo driver could help: http://forums.lenovo.com/t5/ThinkPad-Edge-S-series/Disable-Fn-Keys-E420/td-p/803609 How can I resolve this on Ubuntu 12.04? I couldn't find Lenovo drivers for Linux. UPDATE: Found a peculiar solution for this on Windows. Can anyone recommend a good equivalent for Xubuntu: http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/How-do-you-reset-the-function-keys-on-a-P500-ideapad-to-legacy/td-p/958995

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• If you had three months to learn one relatively new technology, which one would you choose?

  - by Ivo van der Wijk

  This question was taken from CodingHorror. On my list would be (and some actually are): Android Development (and possibly iPhone development) Go language and its concurrency NoSQL, specifically CouchDB RCTK, which happens to be my own idea / project (but all ideas have been thought or already, what matters is my implementation) But I don't think I'm being cutting-edge/thinking-outside-the-box here. What's on your list? Please don't restrict yourself to the list above - that's my list. I'm interested in hearing what others find interesting new technology.

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• Motivating developers in a project perceived as **dull** ?

  - by Fanatic23

  As a manager, I can't always end up generating work that'd be cutting edge. Some of the projects do run on maintenance mode, and generate a healthy free cash flow for the company. As a developer what would it take for you to stick around in this project? I have been thinking of re-branding the work, but I could do with a lot of help here. Appreciate a single response per post. Please don't suggest an increased pay-packet, this creates more problems than it solves.

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• How do I install the latest Mesa release?

  - by Nickolai Leschov

  Which is the preferred way to install the latest stable version of Mesa on Ubuntu? I believe that would be a PPA, but not the bleeding-edge one like xorg-edgers. I would like to see a PPA that contains the latest stable release. Right now 10.3 has reached Release Candidate stage and development branched to 10.4, so the latest stable version is 10.2. Soon 10.3 will become the latest stable version and I'd like a PPA that would follow that. For comparison, xorg-edgers contains 10.3.0~git20140821 and oibaf has 10.4~git1408211930.

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• Can't disable Alt + mouse buttons combinations

  - by Andrey

  I've already searched through the questions, and didn't find the same question as I want to ask. I'm working in blender and there are some combinations that I am used to and remapping them in blender would be the last resort, not the first. I have tried to disable Alt+LMB and Alt+RMB actions in ccsm, I've tried to do this in dconf or gconf editors as well, but nothing helped. As soon as I close the editors or get back to the main screen of ccsm, these combinations are enabled again. So, for example, instead of selecting an edge loop in blender with Alt+RMB, I get this goddamn menu offering me to move the window to another workspace, etc. I really don't need this function, so I'd rather switch it off instead of remapping the hotkeys I'm used to in blender.

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• Resources for Virtual Machine programming

  - by good_computer

  I am a beginner (a little more than that) programmer of C. I am really interested in the field of Virtual Machines. When I read about the Python VM, the PyPy project, the advancements in JVM technology, Google V8, the Erlang VM, I really get excited about these amazing pieces of technology, and really want to get my hands dirty building them or contributing to one of these projects. I need to know.. what are the things (language, concepts, algorithms, math, etc?) I need to know/learn to be able to build a virtual machine any books or other resources that will be helpful career prospects for a virtual machine engineer (but this is least important for me for now) (one more side question: somewhere I'd read something like JVM is on the cutting edge of virtual machine technology -- that it is the most advanced VM so far -- is that true?) Please give me a LONG answer detailing all that you know.

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• System unable to boot in normal mode..! need to select recovery mode and than Generic Mode to boot.?

  - by Haresh Veera

  I am using Ubuntu Server 12.04 LTS KDE Mode. Couple of Days back I updated the system using Muon Package manager. After Updating, now when ever I boot the system, It get stuck at starting bluetooth Daemon Ok / Stopping Bluetooth Daemon Fail.and after long wait its get start to GUI Mode, but with no mouse detection. So need to reboot by pressing CTL+ALT+DEL and when I select recovery mode - Boot in Generic -- It boot perfectly. How can I set the same as default, and remove the error boot loader script. I am no expert to linux or Kernel.

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• How to get useful feedback/bug reports from users

  - by Mikael Eliasson

  I'm sure most webmasters have recived a mail like this: Creating [insert item here] is not working! When you check it out there is no general problem with the function but rather the user has discovered an edge case. Almost every mail I get is like this and in the long run it gets a bit annoying to always have to ask the user for more information. Is there anything I can do to get my users provide more useful feedback? Right now I have a mailto: for the webmaster mail in the page footer. I was thinking of changing this so that they have to report through a form on the site. Anyone got any experience with this? Do you get better/more reports by having a feedback form instead of giving the users the email?

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• The Top 5 Business Challenges in Financial Services. Oracle Process Accelerators as a Solution By Lance Shaw

  - by JuergenKress

  Here at Oracle, we continue to release Process Accelerators for additional solutions.  These Accelerators help achieve process excellence faster with end-to-end implementations of common business processes.  They are Ready-to-use and extensible, and include industry specific best practices. One common industry where Process Accelerators are used to speed the delivery of business process management solutions is Financial Services.  We've recently produced a whitepaper that identifies the top five business challenges in the financial services industry and outlines how adopting Oracle Process Accelerators can give a competitive edge. To get the whitepaper please visit our website. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Technorati Tags: financial services,process accelerators,Lance Shaw,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• Physics-based dynamic audio generation in games

  - by alexc

  I wonder if it is possible to generate audio dynamically without any (!) audio assets, using pure mathematics/physics and some input values like material properties and spatial distribution of content in scene space. What I have in mind is something like a scene, with concrete floor, wooden table and glass on it. Now let's assume force pushes the glass towards the edge of table and then the glass falls onto the floor and shatters. The near-realistic glass destruction itself would be possible using voxels and good physics engine, but what about the sound the glass makes while shattering? I believe there is a way to generate that sound, because physics of sound is fairly known these days, but how computationaly costy that would be? Consumer hardware or supercomputers? Do any of you know some good resources/videos of such an experiment?

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• .htaccess language redirects with seo-friendly urls

  - by jlmmns

  How do I setup my .htaccess file to detect several languages, and redirect them to specific seo-friendly urls? Basically every url needs to go to index.php?lang=(...) So, for English language detection http://mysite.com has to go to http://mysite.com/en/ (index.php?lang=en) my .htaccess as of now (not working): RewriteEngine On RewriteCond %{HTTP:HOST} http://mysite.com/ RewriteCond %{HTTP:Accept-Language} ^en [NC] RewriteRule ^$ http://mysite.com/en/ [L,R=301] RewriteCond %{HTTP:Accept-Language} ^de [NC] RewriteRule ^$ http://mysite.com/de/ [L,R=301] RewriteCond %{HTTP:Accept-Language} ^nl [NC] RewriteRule ^$ http://mysite.com/nl/ [L,R=301] RewriteCond %{HTTP:Accept-Language} ^fr [NC] RewriteRule ^$ http://mysite.com/fr/ [L,R=301] RewriteCond %{HTTP:Accept-Language} ^es [NC] RewriteRule ^$ http://mysite.com/es/ [L,R=301] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-l RewriteRule ^(en|de|nl|fr|es)$ index.php?lang=$1 [L,QSA]

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• Java or C# for a PL/SQL Developer

  - by OracleDeveloper

  Hello, Can you Please suggest as what should be my next carrer move , I am an Oracle Developer , I worked in Forms and reports and know good PL/SQL and SQL. Now , I am thinking to learn new technology as there no jobs in PL/SQL alone and Oracle front-end Forms and reports are on the verge of extinction. The issue is that I have with Java is its HUGE and I need to learn a lot many other technologies as well ( struts , hibernate , spring etc ) in addtion to adv java and Java EE coming. I am think as which technology can give with edge , with PL/SQL and Oracle ... Thank you.

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• High resolution CLI?

  - by Mike Williamson

  I want the resolution of my console to match my screen resolution(1440x900). 1024x768 works fine but for some reason when I put 1440x900 when I switch to ttyX the command prompt is almost right off the bottom of the screen! The Ubuntu splash screen goes off the edge of the screen during boot as well. Here is my /etc/default/grub 4 GRUB_DEFAULT=0 5 GRUB_HIDDEN_TIMEOUT=0 6 GRUB_HIDDEN_TIMEOUT_QUIET=true 7 GRUB_TIMEOUT=10 8 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` 9 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" 10 GRUB_CMDLINE_LINUX="" 11 GRUB_GFXMODE=1440x900 12 GRUB_GFXPAYLOAD_LINUX=keep How do I get my CLI resolution to be 1440x900?

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• New Survey Findings: Application Intelligence and Connected Devices - How do you Harness the Value

  - by Yolande Poirier

  Oracle and Beecham have recently conducted a market survey on use of Connected Devices for M2M & Internet of Things (IoT) applications and new trends. This first session in our webinar series addresses intelligence in connected devices. Join Peter Utzschneider of Oracle and Robin Duke-Woolley of Beecham Research as they discuss: What are the key business drivers of your connected devices program? To what extent do you expect the intelligence required for M2M & IoT applications to change? Would these changes occur at the network edge, at the data center, or both? What are the impacts of these changes on ISV’s and device manufacturers? What are the opportunities for other M2M & IoT players?

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• Elantech trackpad being identified as a logitech wheel mouse.

  - by Nathan Cox

  I recently purchased a Samsung RF510 laptop computer, which I absolutely love. However, upon installing Ubuntu 10.10 onto it I couldn't get the trackpad to function properly. It worked as a basic mouse (point and click) but had no functionality for edge scrolling or any of the multitouch settings the trackpad is capable of. After doing a lot of research I discovered the reason is a known issue where the Ubuntu kernel will improperly detect an Elantech trackpad as a logitech PS/2 wheel mouse, and as such will gain none of the functionality that seems to be coded for synaptics trackpads. The question I have is: does anyone know a way to get this working properly? This is my first time trying to run Ubuntu on a laptop (actually, it's my first laptop in the last 12 years) and I'm finding the experience to be intolerable without the basic scrolling/zooming/etc I've been used to using for as long as I can remember.

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• Multiple domains

  - by menardmam

  I got 6 domains : company.ca and company.com (because both where free, but we are a canadian company but can do business with the rest of the world). Then, we sell sportwear because of the company name is totally unknown to the world. Our product is we have bought product specific domain : chandails.ca and t-shirt.ca as well as shorts.ca and shorts.com. So those 6 domains are mine. Now what is the best way to do? Now all are 301 redirect to the main company name (.com) or make micro-site, super simple one page optimized for just shirt and one for shorts, then tell people to know more, go to the main site. Because now, I cannot really find the benefit of the search word in domain name edge if never somebody see something in that domain... I got confused and don't find strait answer to this question.

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• Is the carriage-return char considered obsolete

  - by Evan Plaice

  I wrote an open source library that parses structured data but intentionally left out carriage-return detection because I don't see the point. It adds additional complexity and overhead for little/no benefit. To my surprise, a user submitted a bug where the parser wasn't working and I discovered the cause of the issue was that the data used CR line endings as opposed to LF or CRLF. Hasn't OSX been using LF style line-endings since switching over to a unix-based platform? I know there are applications like Notepad++ where line endings can be changed to use CR explicitly but I don't see why anybody would want to. Is it safe to exclude support for the statistically insignificant percentage of users who decide (for whatever reason) to the old Mac OS style line-endings?

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• Graphic demonstrating emphasis of front end in web apps

  - by sohail

  I remember stumbling across an amusing graphic a year or so ago which demonstrated the tiers of web development. The back-end was shown as a tiny box, but the front end was shown as a huge box crammed with lots of front-end technologies like AJAX, DHTML. This is all a vague recollection. Does anyone know where on the Intraweb this graphic might be? It was probably on a programming cartoon site, but I only view XKCD on a regular basis, and I couldn't find it on there. Although tagged as fun, my request does have a productive edge to it - it would be quite useful in driving home to my colleagues how UI top-heavy web application development has become.

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• Dynamic body implementation

  - by ArturoVM

  I am writing a 2D game where one of the characters has some very particular requirements. This character is a body with no particular shape (similar to a fluid, but not so much), it has to be able to grow and shrink (as in actually growing, not just scaling), and it has to have collision detection (even if it's basic). Because of this requirements, it obviously can't be based on a sprite, so direct rendering of the shape should be the logical thing to do. I assume this is no easy task, but I just couldn't find a good physics engine that covers these requirements (or at least no tutorial on how to do it; I particularly searched for Box2D tutorials). Is there a way of doing this with Box2D, SDL, or any other physics or game engine out there? If not, what's a good place to start? I am really clueless as far as soft-body physics are concerned.

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• My wireless/WiFi connection does not work. What can I do?

  - by Wild Man

  Your situation You have successfully installed Ubuntu. You have just downloaded and booted Ubuntu live media. The latest LTS (see also HWE) or latest non-LTS release are preferred. See the list of Ubuntu releases that are currently supported.) You upgraded your Ubuntu installation to the latest release that the software updater offered you. WiFi worked before, but not now on the new release. You migrated your existing Ubuntu installation to new hardware. Your problem The wireless of your laptop or dekstop is not working. You tried switching the wireless switch off and on and you tried rebooting several times, but you don't see any WiFi access points. You can see your wireless access point, but you cannot establish a connection. You want to analyze the problem, but you don't know where to start or what information you can provide. Related questions I have a hardware detection problem, what logs do I need to look into?

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• Multithreading for a mixed-genre game in Python?

  - by arrogantc

  So here's the situation. I'm making a game that mixes two genres; arcade shooter and puzzler. They don't intertwine TOO much; all the interaction that really goes on is that every time an enemy is destroyed, a block is created. The blocks aren't even a part of the main collision detection system; they have their own more suited to their needs. What I want to ask is this; might it be a good idea to have the arcade shooter portion run on one thread, and the puzzle game portion run on another?

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• [JOGL] my program is too slow, ho can i profile with Eclipse?

  - by nkint

  hi juys my simple opengl program is really toooo slow and not fluid i'm rendering 30 sphere with simple illumination and simple material. the only hard(?) computing stuffs i do is a collision detection between ray-mouse and spheres (that works ok and i do it only in mouseMoved) i have no thread only animator to move spheres how can i profile my jogl project? or mayebe (most probable..) i have some opengl instruction that i don't understand and make render particular accurate (or back face rendering that i don't need or whatever i don't know exctly i'm just entered in opengl world)

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