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• Testing complex compositions

  - by phlipsy

  I have a rather large collection of classes which check and mutate a given data structure. They can be composed via the composition pattern into arbitrarily complex tree-like structures. The final product contains a lot of these composed structures. My question is now: How can I test those? Albeit it is easy to test every single unit of these compositions, it is rather expensive to test the whole compositions in the following sense: Testing the correct layout of the composition-tree results in a huge number of test cases Changes in the compositions result in a very laborious review of every single test case What is the general guideline here?

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• Efficient algorithm to find a the set of numbers in a range

  - by user133020

  If I have an array of sorted numbers and every object is one of the numbers or multiplication. For example if the sorted array is [1, 2, 7] then the set is {1, 2, 7, 1*2, 1*7, 2*7, 1*2*7}. As you can see if there's n numbers in the sorted array, the size of the set is 2n-1. My question is how can I find for a given sorted array of n numbers all the objects in the set so that the objects is in a given interval. For example if the sorted array is [1, 2, 3 ... 19, 20] what is the most efficient algorithm to find the objects that are larger than 1000 and less than 2500 (without calculating all the 2n-1 objects)?

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• Is there a language that allows this syntax: add(elements)at(index);

  - by c_maker

  Does a language exist with such a syntax? If not, what are some of the limitations/disadvantages to this syntax in case I want to write a language that supported it? Some examples: sort(array, fromIndex, toIndex); vs sort(array)from(index1)to(index2); Method signature would like this: sort(SomeType[] arr)from(int begin)to(int end){ ... } Update: Because there might be some confusion, I'd like to clarify... I meant this question as a general idea like this (not specific to sorting and possibly using keywords like from and to): In JAVA(like language): void myfancymethod(int arg1, String arg2){ ... } myfancymethod(1, "foo"); In imaginary language: void my(int arg1)fancy(String arg2)method{ ... } my(1)fancy("foo")method;

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• User input and automated input separation

  - by tpaksu

  I have a MySQL database and an automation script which modifies the data inside once a day. And these columns may have changed by an user manually. What is the best approach to make the system only update the automated data, not the manually edited ones? I mean yes, flagging the cell which is manually edited is one way to do it, but I want to know if there's another way to accomplish this? Just curiosity. BTW, the question is about cell values, not rows.

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• Powerpoint: remote pointing and slide track device

  - by kkp

  I think that this question may not be suitable for this forum. But I need your help. I am planning to buy a remote pointing (not only just pointing, we will be able to track the slides) device for my powerpoint presentations. I always use Ubuntu and powerpoint with libreoffice impress. I have been looking products on amazon, most of them are either for Windows or MAC. I am not sure whether they will work on Ubuntu. I think that at least some of of you have been using a device for presentations on Ubuntu. It would be great if you share one that will work seamlessly with Ubuntu. Thanks.

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• How to learn programming from very basic level to advanced level? [closed]

  - by user1022209

  I know many programming languages ,skills and concepts in very basic, such as PHP, Java, Object-oriented technology. Using PHP, I can build a simple website with CRUD, login function. Using Java, I can make an basic swing csv/plain text editor in which user can switch between 2 different views. In term of object-oriented Technology, I clearly understand what encapsulation, inheritance and Polymorphism are I want to know more about programming. Sometimes I "google" some of the topics I am interested at , the more I see on the internet, the more I feel I am a small potato in the world ( indeed I am ). The codings/concepts are difficult to understand. I lacks confidence right now so I am asking this question :( What is the best way to learn programming to advanced level? Just buy a book and read it page to page? Thanks for any helps

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• Why would companies allow these practices?

  - by MuduM

  Here's a situation that usually happens in some companies: Announce interesting product X. Promise a release date. Release on the promised released date, ready or not. Users discover and report defects. Send patch after patch after patch after patch after patch. My question is: Ummm, what could be the factors that would lead them to tolerate these undesirable practices? So, in the name of quality, what can be practically and realistically improved in those practicies? I can think of time constraints, user feedback, sponsors pressuring the company, lack of money.

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• Using a texture as an integer array (OpenGL 3.3, shader version 3.3)

  - by Cubic

  I'm trying to have something like an integer array uniform for my fragment shader (I only need read access). Since it's a fairly large chunk of data (not so large that uploading it in every frame would be impossible, but enough to make me want to rather not do it). Essentially I want to just pass it a uniform telling the shader where this "array" is. I believe I can use a 1D texture for this, but I don't know how (actually, I don't know how to do many things because I just can't seem to find a reference for GLSL 3.3, I only ever find references for the C API). This sounds like a rather basic question and I'm sure it's been answered already somewhere, but I keep searching and can't quite find what I'm looking for.

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• Can I randomly generate an endless road?

  - by y26jin

  So suppose we stand on a position(x0, y0) of a map. We can only move on the horizontal plane(no jump and stuff) but we can move forward, left, or right (in a discrete math way, i.e. integer movement). As soon as we move to the next position(x1, y1), everything around us is generated randomly by a program. We could be surrounded by one of mountain, lake, and road. We can only move on the road. The road is always 2D as the map itself. My question is, are we able to play this game endlessly? "End" means that we come across a dead end and the only way out is to go backward.

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• Having problem to login after upgrading from 11.10 to 12.04

  - by LinuxIsMyFriend

  I just update to 12.04 from 11.10 and I get to the login screen w/o problems. When I enter my password the screen turns black and returns to the login screen half a second later. There is a related question out there which was solved by creating more space on the disk but my disks (or rather partitions) are all below 30%. I can log in as guest. I can also login at the cmd prompt (going to tty with Alt+Ctrl+F1) with my normal user credentials. When logged in as guest I can also install programs using my normal account password. There is the normal authentication error when I mistype my password so I'm also sure the password works. Any suggestions?

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• Googling query from anywhere

  - by Shagun

  Some times when I am trying out stuff on my terminal, I get some blockade or some error to resolve which I have to copy the error or last message then open my browser and then Google the query. Is it possible for me that I select the message via mouse and when I right click I get a Google it option as I get when I select some text on a browser? PS : I am not asking how to do Google search via terminal or how to browse web via terminal.These were the results I got when I goggled my question. what I want is something more general. Whenever I select a piece of text I should get a "Google me" option with the right click of my mouse(or maybe with pressing of a key or something). I would prefer that the query takes place in a browser and not in a terminal.

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• HTML5 : trop de battage médiatique ? L'équipe du framework Kendo UI répond dans un état des lieux sur l'utilisation du langage

  État des lieux sur l'utilisation du HTML5 par l'équipe de Kendo UI "Le battage médiatique du HTML5 est-il justifié ?" Voici la question que se posent en substance l'équipe de Kendo UI, le framework JavaScript et HTML pour obtenir des interfaces utilisateurs "modernes". Pour y répondre, l'équipe a sondé plus de 4.000 développeurs. Trois questions sont particulièrement intéressantes et portent sur : la tendance d'adoption du HTML5 ; l'importance de HTML5 pour les développeurs ; l'impact des influences extérieures sur le HTML5 (exemple : le fiasco mobile de Facebook). Le résultat comple...

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• C++ game programming

  - by UnTraDe

  Until now I have been using C# with XNA for 2d and a little bit of 3d games, althought I dont remember that I finished any of them I want to start working with C++. I have a very very little exprience with C++ and my question is where to start? I plated a little bit with SFML and I encountered some problems with performance when I started to build a tile based game. I'm pretty sure that the problem is my code and not the library itself. Is there anything similiar to XNA for C++? I should keep try and work with SFML? Sorry for my bad english! Thanks in advance!

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• Running the Ubuntu Kernel and OS on custom processor

  - by xupv5

  This is hardly a theoretical question as many have done this, albeit there's very little information on the underlying processes. I'm developing a custom MIPS-based processor on which I would like to run ubuntu. I'm quite baffled as to what to do next after you've designed the instruction set and the computer architecture itself. I need to be able to run a kernel and OS but how does it all tie in? At the moment I'm researching into designing a compiler for the linux kernel to generate the appropriate assembly language. Is that a good way to go? What do I need to do after that?

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• Ubuntu server upgrade 11.04 to 11.10 fails

  - by DLosc

  I'm actually trying to upgrade my Ubuntu 11.04 server to 12.04, but I have to go through 11.10 first, right? Well, do-release-upgrade is failing miserably. Here are some representative screenshots: Screenshot 1 Screenshot 2 Screenshot 3 Screenshot 4 And finally... Yeah. I found this question, which appears to have similar errors, but I've tried all of the suggestions given there and nothing has changed. I tried running apt-get dist-upgrade; it churned for a while and eventually came back with "Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?" Ran apt-get update and got much the same kinds of error messages I got from do-release-upgrade. Any ideas/suggestions/solutions? Should I try downloading & upgrading from the CD instead? I'm glad to provide any further information I've forgotten.

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• Is Google indexing pages that has no connection with other pages? [duplicate]

  - by Grkmksk

  This question already has an answer here: How did Google find my unlinked newly created pages? 3 answers I am working on a web project that has nearly 100 thousand instant users and there is a webpage that we are using for test cases. There are no links pointing to it from other pages. It shouldn't be indexed by Google or any other search engines. "noindex" can be used in this situation, I know but I wonder if Google (or any others) indexes this page, if I don't do anything to prevent it.

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• Multiplayer in a game. How to design it object wise?

  - by Ninetou

  I was suggested on StackOverflow to ask this question here. I'm working on a simple game and I was thinking of adding multiplayer feature but I'm a bit stuck. I'm not sure what approach should I take, keeping in mind good programming practices. I have a Player object which is created for each player but then I have many other classes that would have to be able to access them. The thing is, if I initialise them in, let's say my main method, then I can't relate to different instances of player class from other classes. The only solution to my problem that comes to my mind is using some form of global objects but afaik using anything globally in apps is usually not a good practice. Any suggestions/ideas?

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• Add closure after concatenating files or keep one for each separate file?

  - by sdespolit

  At the moment every javasrcipt file in our project includes closure wrapper. Before deploying all files are concatenated and minimized. And i'm asking myself, do we really need all that closures OR one closure added after concatenation will do the job. I can see only one reason not to do that - the variable we are sharing between files will get in the global namespace. But there is no conflict so is don't see any problem. The real question is what other cons may be? Or more generally what approach is better - one closure or many?

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• Wireless hardware is not getting switched on in 12.04

  - by user89733

  I have recently installed ubuntu 12.04 in sony vaio VPCEH. And updated all the available updates through update manager. When i switch on the bluetooth/wireless (hardware switch), only the bluetooth is turning on. For wireless, it shows as "hardware disabled". P.S: It was working fine few days before. Suddenly It is not turning on. i just get an answer for this question while googling. just enter the following command in the terminal. "sudo rfkill unblock all" This will unblock all hardware ports. that's it!!!!!! :) It works,..

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• Force Gnome 3 to work

  - by nkg5

  I have Ubuntu 12.10 on dual-boot with windows XP. My PC specifications are AMD Sempron 2800+ 1,6GHz with 512 MB ram and ATI Radeon 9250 graphic card with 128 MB memory. As Unity works slow and I don't like it's look, I installed gnome-shell. But as you know, Gnome 3 won't work on it. But gnome classic without effects works great. Thing is, when I turn off windows (by holding the power button or pressing restart button) my resolution on Linux is changed to 1024x768, and I can only change it by turning off the PC and turning off it's power source. But it is not the problem. The problem is that it runs Gnome 3 after one restart, it also runs better than Unity. My question is: Can I somehow force gnome 3 to work always and disable some of it's effects so it can run better?

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• Versioning Java APIs in a non-web context

  - by GAP

  I have modular java application which consists of 40 modules. Some of these modules needs to expose external APIs which other modules or any external integration should be using. The system runs as a desktop application and each module is bundled as a separate jar file. My plan is to bundle the external api as a separate jar. But now the question is: how can I maintain multiple versions of the same API to keep backward compatibility in cases where it can co-exist? Are there any de facto standards on handling APIs versioning out of a web context ?

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• How do you manage all of the information you have learned and found? [closed]

  - by B Seven

  Possible Duplicate: How do you manage your knowledge base? What do you use for personal note taking to keep track of everything you learn? Are you always Googling or searching StackOverflow to answer the same questions? Or searching for and copying and pasting existing code? I feel like I have a poor memory, especially remembering things like syntax. Are there any knowledge management systems that would work well for a programming language or operating system? It would be great if there were a way to save everything I learn in an easy to search system. Does such a thing exist? Maybe you would be able to search by question (How to sort an array?, How to set static IP?), or by tag (sort, array, enumeration, iterator, IP). I know it would be easy to develop my own system, but I thought it would be great to learn what works for other people.

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• Running Visual Studio 2012 on a convertable windows 8 tablet? [closed]

  - by Tony

  I was unsure on where to post this question so I am posting here. I was wondering if any of you are using one of the new windows 8 convertible tablets to do web development on? If so what model are you using and how do you find the experience? I have a monster gaming laptop that I usually use to develop on but it is so large and is a real pain to move around with. I would like something that is extremely portable and would effectively let me develop anywhere.

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• Updating NVIDIA drivers from 295.40: What will happen to TwinView?

  - by Spice

  Right now, I have the NVIDIA proprietary drivers enabled without the Ubuntu-X repo, so the driver version is 295.40 (which is on the official Ubuntu repo) instead of the current 304.64 for my card, but I want to update to the current (using the Ubuntu-X repo). From what I heard, after 302.xx, NVIDIA started supporting RandR and removed TwinView. My question is, I have TwinView enabled for two monitors. If I update to the new version, what will happen to my TwinView settings? Will there be any extra work to do to migrate to the new driver?

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• Is it necessary to memorize code?

  - by AAA

  I am a new developer, who just got hired at a big company. I don't know how but I guess they are desperate. However, I am well-versed with HTML5/CSS3 though things change and new things are released and I keep up with as much as I can. But this job required me to hand-code Javascript, know Jquery and Ajax. I have been exposed to this a bit but I am not sure if I can hand-code Javascript. My question is, is it necessary to memorize all there is about Javascript or are there a few key things that I should know how to hand-code because looking at javascript code it seems there are lots of lines code! Please point me in the right direction.

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