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  • How often do CPUs make calculation errors?

    - by veryfoolish
    In Dijkstra's Notes on Structured Programming he talks a lot about the provability of computer programs as abstract entities. As a corollary, he remarks how testing isn't enough. E.g., he points out the fact that it would be impossible to test a multiplication function f(x,y) = x*y for any large values of x and y across the entire ranges of x and y. My question concerns his misc. remarks on "lousy hardware". I know the essay was written in the 1970s when computer hardware was less reliable, but computers still aren't perfect, so they must make calculation mistakes sometimes. Does anybody know how often this happens or if there are any statistics on this?

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  • Unable to remove network proxy

    - by Rushil
    I'm on 11.10 I'd set up a network proxy a couple of days back from system settings .And afterwards I'd set my proxy method back to none. However, my proxy has not been removed. I know this because: a: 127.0.0.1 routes me to the index.html file in the base directory of the proxy server. b: I'm able to access my university internet after hours. I checked my /etc/environment and etc/apt/apt.conf file and both of them have no proxy details. I also tried resetting the proxy and then getting rid of it but that didn't work either.

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  • Progressbar patterns (Eclipse)

    - by JesperE
    I've struggled quite a bit with Eclipse and progress-monitors to try to have good progressbars which report useful progress information to the user. Inevitably the code gets cluttered with lots of things like if (monitor.isCancelled()) return; ... lengthyMethodCall(monitor.newChild(10)); and all over the place I need to pass a IProgressMonitor as an argument to my methods. This is bad, for several reasons: The code gets cluttered with lots of code which is not relevant to what the function actually does. I need to manually guesstimate which parts of the code takes time, and which parts do not. It interacts badly with automated tests; where much of the information which goes into a progressbar instead should be logged for later inspection. Is there a way out of this? Are there tools which can help me out with one or more of these problems? Should I be looking at Aspect-Oriented Programming tools, or are there other alternatives?

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  • Dart Package Management with Pub

    Dart Package Management with Pub Pub is the package manager for Dart. With pub, you can manage libraries and dependencies for your Dart apps. This video shows you an early preview of pub and gives a demo of a Dart app with 3rd party libraries installed by the pub command line. Dart is a new structured web programming language, libraries, and virtual machine. Dart works across the modern web, thanks to its Dart to JavaScript compiler. You can try Dart, and pub, today at www.dartlang.org From: GoogleDevelopers Views: 2 0 ratings Time: 03:47 More in Science & Technology

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  • Is it possible for a good programmer to have never used version control?

    - by lortabac
    I am looking for an expert programmer to help solve a difficult situation. The interviews so far have been surprisingly disappointing. The best candidate so far is a very experienced programmer who has never used version control software. The problem in itself might not be too serious because it is something which can be learned in a short time. But there is a deeper aspect, which worries me: How is it possible to actively develop software for 10-15 years without ever needing version control? Is the fact itself of not looking for a solution to the problem of tracking changes a sign of a wrong attitude to programming?

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  • 3 SQL Join Concepts to Help You Choose the Right Join

    What do SQL joins and the "teach a man to fish" Chinese proverb have in common? SQL joins, like regular expressions, are one of those commonplace programming tasks in which true success is entirely dependent upon your ability to conceptualize the outcome. Fail to do so and you'll likely wind up spending a few hours in a frustrating round of trial and error. Like regular expressions, the proliferation of online examples has actually contributed to the frustration, providing the equivalent of a day's worth of fish rather than the proverbial fishing pool. The Future of SQL Server MonitoringMonitor wherever, whenever with Red Gate's SQL Monitor. See it live in action now.

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  • why doesn't cron complete script

    - by brickinthewall
    i have a backup script (rsync via ssh) which is run by cron (configured in /etc/crontab) 0 2 * * * root /bin/bash --login /opt/aebackup/sshbackup.sh if i run it as logged in root like following it runs prefectly fine. root@server:~# /opt/aebackup/sshbackup.sh if i run it via cron it would just stop after a while (not always on the same task in the script.. it seems pretty random, like the process is killed at some point randomly) does anyone have an idea why my cron would do that? thanks for anything.. i'm desperate!

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  • Code Space : le projet de Microsoft qui introduit une nouvelle façon de collaborer en utilisant Kinect, terminaux tactiles et PC

    Code Space : le projet de Microsoft qui introduit une nouvelle façon de collaborer En utilisant Kinect, terminaux tactiles et PC Microsoft research vient de mettre sur pied un projet qui présente un nouveau concept de partage de l'information lors des réunions ou séance de travail en petit groupe. Le projet baptisé « Code Space », démocratise l'accès, le contrôle et le partage d'informations à travers de multiples dispositifs personnels et de présentation publique. [IMG]http://rdonfack.developpez.com/images/CodeSpace.jpg[/IMG] Le système comme son nom l'indique, a été conçu à la base pour les développeurs. Avec cette technologie, ceux-ci peuvent facilement...

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  • What is a good university for computer science and game development?

    - by DukeYore
    I am starting my computer science degree at a local community college in programming using C++. However, I will be transferring to a 4-year university. Does anyone have any insight on university programs? I know Cal State Fullerton has a degree with a minor in Game Development. however, is that as important as getting a degree from a really great school? If I could shoot for something like Cal Poly would that be better? Or even Stanford or SF State being so close to so many gaming companies up there in the Bay area?

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  • Career in Artificial Intelligence [closed]

    - by Rohit S
    AI has many branches and seems like it has a bigger scope. I have seen a tutorial of Neural Networks and I'm a little confused whether Neural Networks is another branch of AI or it is a technique which is being used in branches of AI. I am mainly interested in creating software like Neural Networks that can be trained for doing a task. I like to make things automated with programming languages. So can I start with Neural Networks? And also a very important matter: what will be the scope of a job in future and in which companies?

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  • Does your team develop their supporting tools or this should be outsourced out of it?

    - by Pierre 303
    By supporting tools, I mean: reference data manager, like virus definition for anti-virus software test data generator level builders for games simulators or advanced mocking systems Does the team building the core product (in the case above, the game or the anti-virus) should be part of the development of the supporting tools significantly, or this is a task you would outsourced out of the team to help it focus on the product? I don't have enough experience to evaluate the pros & cons of each, so I'm hopping you would come up with personal experiences to share, or even studies or papers you read on the subject.

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  • Popularité des langages : Go de Google chute, Objective-C dans le Top 10, d'après l'index de juin de

    Mise à jour du 07/06/10 Popularité des langages : Go chute, Objective-C dans le Top 10 D'après le classement du TIOBE Programming Community Index de juin Au delà de la rivalité entre Java et C, les deux langages qui continuent de se disputer la première place du classement des langages de programmation les plus populaires, l'index mensuel de TIOBE recèle en juin deux enseignements intéressants. Le premier concerne Go, le langage de Google qui avait récemment fait une progression fracassante. Go connait aujourd'hui un recul très significatif puisqu'il recule brutalement et disparaît du Top 20 de l'indice (21ème). En sens...

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  • A great option for those of us who live by virtual environments, SQL Server 2008 R2 sysprep

    - by Enrique Lima
    For a long time when creating images for my development environment, I had to install the OS and then sysprep.  Only after that would I then create a differencing drive/image that would have SQL Server. So, the thought of having a base/core image for SQL Server as a template was not easily done.  Well, how do things change?  SQL Server 2008 R2 gives us the option now. Check this HOW TO provided on the library docs at TechNet.  http://technet.microsoft.com/en-us/library/ee210664(SQL.105).aspx

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  • Correct process for creating builds reliant on 3rd party packages

    - by Patrick
    I work on a Symfony 2 codebase. We use a number of third-party packages (most are in the Symfony Standard Edition). We use composer for dependencies. We current have all of our third-party code committed in our repository (after changing .gitignore files) to ensure stability. According to Proper Programming Practices™, we are not supposed to have any third-party packages in our repo. We are supposed to pull them down and include them at build time. How are we to do proper QA and debugging when at any given time our dependencies could push an update that breaks functionality?

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  • Duplicating content from another site and adding value (summaries, statistics) - ranking and courtesy

    - by Krastanov
    I am working on a site that takes a governmental data base, provides a number of statistical and other summaries and also post the original data. However this data (mostly long pieces of text) is also published on the official governmental site (without the added value of summaries). Should I worry about google ranking due to this duplication? What is the preferred way to point to the official source of the information? There is no advertisement on my site. My site is ".com". The governmental site is ".bg".

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  • Vers des serveurs embarquant des puces ARM basses consommations ? Crédible, souhaitable ou irréalist

    Vers des serveurs embarquant des puces ARM basses consommations ? Crédible, souhaitable ou irréaliste ? ARM est connu pour ses puces basses consommations qui équipent bons nombres de terminaux mobiles allant des téléphones portables aux netbooks. Mais le consortium, basé à Cambridge, aurait d'autres projets dans ses cartons. C'est en tout cas ce que laisse entendre son directeur Marketing, Ian Drew, qui vient de révéler qu'un site test (le Linux Internet Platform) utilisait un serveur embarquant une puce ARM depuis environ un an. Ce test ferait suite à plusieurs demandes de la part de clients particulièrement intéressés par des les économies d'énergie que pou...

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  • Add Matlab to main menu

    - by Tim
    I was trying to add the installed matlab to the menu of Applications under Ubuntu 10.10. I clicked System-Preference-Main Menu - Programming - New Item, where I input the Matlab file .../MatlabR2010b/bin/matlab as the command, and selected the type to be "Application". Then I finished. But when i click the item in the menu of Applications, the Matlab icon shows up a few seconds and then nothing else happens. If I select the type to be "Application in Terminal" in the last step of adding Matlab to the menu of Applications, then when I click the item in the menu of Applications, there will be firstly a terminal window and then the Matlab command window. So I was wondering how to solve the problem of Matlab not starting when the type has been selected to be "Application"? Also is there a way to eliminate the terminal appearing when the type has been selected to be "Application in Terminal"? Thanks!

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  • June 14th Webcast: Using Personalization in Oracle eAM

    - by Oracle_EBS
    ADVISOR WEBCAST: Using Personalization in Oracle eAMPRODUCT FAMILY: Enterprise Asset Management June 14, 2012 at 11 am ET, 9 am MT, 8 am PT Personalization is the ability within an E-Business Suite instance to make changes to the look and behavior of OA Framework-based pages without programming (and, therefore, upgradeable!).TOPICS WILL INCLUDE: Oracle eAM customers have leveraged Personalization to address many of the following use cases: making a non-mandatory field mandatory on a Work Order adding a new field to the header region entering the specifications for a new field disabling a field to prevent user entry adding Asset Description to Create Work Request Page viewing Asset Hierarchy in Create Work Request Page setting Auto Request Material Flag to yes by default A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services. Current Schedule can be found on Note 740966.1 Post Presentation Recordings can be found on Note 740964.1

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  • Java Error Using Loops [migrated]

    - by Shaun
    I am facing a error in Java using the method Loops. I am a basic user learning Java and I am following a book with teaches you the basics of Java. I have this problem when I use this code in my Java Program. It gives me an red line under my code. Here's my code: public class Game{ public static void main(String[] args){ for (int dex = 0; dex < 1000; dex++) { if (dex % 12 == 0) { System.out.println(“#: “ + dex); } } } } I have been following the tutorials correctly. I am a bit lost where I have gone or done wrong. I have my public static codes and such as you'd require in any Java programming. Here's are the error given): Cannot resolve method: 'Println(? , ?)' Expression expected ',' or ')' expected Unexpected Token ';' expected

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  • Am I violating LSP if the condition can be checked?

    - by William
    This base class for some shapes I have in my game looks like this. Some of the shapes can be resized, some of them can not. private Shape shape; public virtual void SetSizeOfShape(int x, int y) { if (CanResize()){ shape.Width = x; shape.Height = y; } else { throw new Exception("You cannot resize this shape"); } } public virtual bool CanResize() { return true; } In a sub class of a shape that I don't ever want to resize I am overriding the CanResize() method so a piece of client code can check before calling the SetSizeOfShape() method. public override bool CanResize() { return false; } Here's how it might look in my client code: public void DoSomething(Shape s) { if(s.CanResize()){ s.SetSizeOfShape(50, 70); } } Is this violating LSP?

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  • Removing unnecessary joomla CMS components

    - by Gaz_Edge
    Background I have been developing a web application. I have been using Joomla platform and CMS as the base from my application. My application relies heavily on the joomla platform, but uses very few features of the CMS (I have to login users etc so I use the _users component of the CMS). Question What is the best way to start removing some of the excess CMS that I don't need? For example when I being building my production site, I will want to avoid creating a load of joomla component database tables etc. I have read that an application can be build from the ground up using just the joomla platform, but i still want to include the _users component and would also like to avoid having to start coding all the session handling aspects. Any advice?

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  • Randomization of biomes

    - by user24527
    You know how in Minecraft, the World is ever-expanding and all the biomes are randomized? My generalized question is: In relation to a space simulation that is also ever-expanding as the player moves about the world, how would one go about programming this randomization in Java? My real question is: Could I get a simplified example broken down into these example classes: astroids (This would include how many astroids there are, their positioning in space, their size, how often the larger astroids occur, how close they are to each other, the limitations of how many of the large asteroids can be in one field, how often astroid fields are generated, etc.) star-types (size, color, type, how often they occur, where hey occur, etc.) inhabitable-planets (size, positioning, how often they're generated, where they are generated, etc.) This would be very helpful currently since I wish to make a simplified version of such a program.

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  • How to automatically generate html table from image in Linux?

    - by alfish
    In Photoshop, you can easily devide the image into zones using point and click and it automatically generates the corresponding html with image slices addressed in tables. Gimp also has a Slice (Filter Web Slice) but it is so rudimentary and, as far as I can see, does not allow point and click selection of slices. I am wondering if the functionality can be added into Gimp, or there are other Linux software to do this. I hate to return to Windows jut to do this simple task which I happen to use frequently. Thanks in advance for your suggestions.

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  • Storing E-mail addresses more efficiently in SQL Server

    A lot of people are storing large quantities of e-mail addresses in their systems. Since a large percentage of any system's user base is going to be supplying e-mail addresses from a few of the vastly popular providers (such as GMail and Hotmail), we are storing the "@gmail.com" and "@hotmail.com" parts of those addresses on disk over and over and over again. Get smart with SQL Backup ProPowerful centralised management, encryption and more.SQL Backup Pro was the smartest kid at school. Discover why.

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  • How to create a simple side scroller game

    - by D34thSt4lker
    I'm still pretty new to game programming and any tutorial that I have worked with stuck to only games with the initial screen. I want to start creating my own games but there are a few things that I still need to learn. One of them is how to create a game that side-scrolls. For example; Mario... Or ANY type of game like that... Can anyone give me a small example to create something like that. I'm not asking for any specific language because currently in school I am learning javascript but I know some c++/java/processing/objective-c as well. So any of those languages would be fine and I could probably implement it in any of the others... I have been searching for some help with this for a while now but could never actually get any help on it. Thanks in advance!

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