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• Where should a programmer explain the extended logic behind the code?

  - by SRKX

  I have developed a few quantitative libraries in C# where it is important to understand not only the classic information that goes with the XMLDoc comments (which contains basic information with the method signature) but also the mathematical formulas being use within the methods. Hence I would like to be able to include extended documentation with the code, which could contain, for example Latex formulas, graphs, and so on. Do you think such information should be included in the API documentation? Or should it be included in a dev blog for examples? Are there common tools that are usually used for this kind of purposes?

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• Ubuntu perfomance issues

  - by Pelda

  I have as deafult Win 7 64b. But i get annoyed by some windows stuff so I decided to install ubuntu and learn Linux, because Win 8 is a nightmare. I have my Ubuntu 12.04 64bit installed in 100gb partition of my 1 Tb disc. My problem is that my Ubuntu feel really slower than Win 7 - even though my Win 7 are after some years of usage and they became much slower. And Ubuntu is just installed OS - I just downloaded wine and skype. It takes some time for new window to appear (its not 10 seconds, but its really slower than my windows). Sometimes my donwload get stuck (in basic ubuntu app store) Its just weird to me. I thought its because of some drivers, but I am really new to linux, so I decided to ask some1 before I screw whole system up. Specs: -6gbs of RAM - 3x2gb -3.0 ghz CPU quadcore -graphic card is HD4870 sapphire Please excuse my poor english and my addiction to windows interface. Pelda

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• Drivers are not detecting on my Dell inspiron 5420 (14R 3rd generation)

  - by Ranjan Mallik

  I'm using DELL inspiron 5420 (14R 3rd generation), and tried to install ubuntu 10.10, 11.10, 12.04, 12.04.1 but each and every time it doesn't support any of my driver such as network card, wireless driver, video driver and as well as audio and touch-pad driver. audio, video and touch-pad works with their basic functionality but don't work with their full functionality. I'm a new user of ubuntu, and willing to use it permanently. In this condition I tried some solutions from the web but didn't get out from this problem. For this I'm knocking to you, If you give me the proper solution for getting out of this problem, I'll be very helpful to you all. Thanks

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• What's your advice in getting Oracle Certified Professional Java Programmer certificate?

  - by den-javamaniac

  Hi. I'm intending to get the certification but not completely sure how to time effectively prepare myself. So I'm wondering if I can be advised on the matter, in particular I would like next questions to be answered: - What the basic learning/practicing plan should look like? - What book (set of books) should be considered? - What practical exercises should be performed? NOTE: I've got several years of corporate experience (mostly web apps, though), but I want to be 100% sure I'll pass the test (that's the reason the issue is raised).

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• USB Mouse stutters periodically

  - by greggory.hz

  I'm using an HP dv6000 (not sure of exact model) with a pretty basic Logitech wireless laptop mouse. From time to time, the USB mouse will be very stuttery and less responsive. Not all clicks register and the motion is not smooth. It seems like it's related to the notify-osd coming up when I get an IM or Email or whatever else, but it happens other times as well. It's not the whole computer becoming less responsive, because if I use the touch pad during one of these fits, it works perfectly smooth. I've replaced the batteries in the mouse and have tried different USB ports with better line of sight, etc. I can't figure out what's going on. Any thoughts?

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• Are people getting away with the "follow 1000s and then unfollow" Twitter trick? [closed]

  - by Baumr

  It seems that more and more people are trying to 'cheat' their way into more Twitter followers. The basic mechanism is: Follow thousands of people on Twitter with the hope that they'll follow you back. Once it reaches a point you're happy with, start gradually unfollowing them. That way, at the end of the day, it'll look like a lot of people follow you unconditionally. I've seen self-proclaimed social media and SEO experts do this. It's clear they want to look influential — and will use black hat social media tactics to do so. I can see how it can work, so is Twitter letting them get away with it? Should it?

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• How to Create an Installable DotNetNuke PA Module Using OWS - 3 Videos

  In this tutorial we demonstrate how to create an Installable DotNetNuke PA (Private Assembly) Module using Open Web Studio. A PA module is a standard module that you would install using the host menu / extensions option in DotNetNuke. Throughout the tutorial we show you how to create a basic Contacts application using Open Web Studio and then how to package the OWS application so that it can be installed as a module to any DotNetNuke installation. The videos contain: Video 1 - How to Build a Contacts and Settings OWS Module Video 2 - How to Create the DNN Installable PA Module Files Video 3 - How to Create and Test the Installable PA Module Zip File Total Time Length: 22min 46secDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Is it normal for 12.04 to occupy almost 4GB?

  - by Grant

  I'm using a ASUS EeePC 901 and have some basic questions/issues. I installed 12.04 on the 4GB drive, selecting the option to erase it before doing so. Immediately after the installation I saw that Update Manager had over 100 updates pending. I attempted to install these, but was told that I had less than 100 MB remaining. Does the OS occupy all the other space? It seems that the best solution is to install 12.04 on the 16GB drive. Is this true? If I do this, what is the best way to erase the 4GB drive afterwards?

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• JavaOne 2012: JDBC Community Discussion

  - by sowmya

  At JavaOne2012, Mark Biamonte of DataDirect Technologies and Lance Andersen of Oracle organized a discussion about JDBC. To learn more about using JDBC to develop database applications, see the JDBC trail in the Java Tutorials. You will know how to use the basic JDBC API to * create tables * insert values into them * query the tables * retrieve the results of the queries * update the tables In this process, you will learn how to use simple statements and prepared statements, and see an example of a stored procedure. You will also learn how to perform transactions and how to catch exceptions and warnings. - Sowmya

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• What's the difference between AppMobi and PhoneGap?

  - by Ajmal

  I am new to the cross platform application development. I came across the very similar cross platform frameworks AppMobi and PhoneGaP. I found the basic difference between appmobi and phonegap is appMobi offers a complete cloud-based development system that includes a the XDK development tool. ie It's possible to develop Apple apps without owning a Mac using appMobi. I want to know Is there any differences between apk/ipa created using Appmobi and apk/ipa created using PhoneGap? Is there any difference in native features that can be used ? Also other differences between these two.

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• Help with timebased scoring algorithm

  - by Dave

  Im trying to devise an appropriate scoring system for my game. The game in essense has a finite number of tasks to complete (say 20) and the quicker you complete these task, the more points you get. I had devised a basic way of doing this using bands of time multiplied by a score for that band multiplied by the number of tasks solved within that time band i.e. (Time Band) = (Points) 1-5 sec = 15, 5-10 secs = 10, 10-20 secs = 5, 20-30 secs = 3, 40 secs onwards = 1, So for example if I did 3 tasks in the 1-5sec band i'd get 15*3=45points, if i found 10 in the 20-30sec band i'd get 3*10=30 points. Im sure there is a more mathematical way of doing this using powers of some kind but I just can't think how and hoping someone has already done something smilar.. Many thanks in advance

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• Prevent product key from being used on multiple virtual machines

  - by Nahum Litvin

  I have a software product. it will probably run on VMs that have no network connection at all. I want the user to pay for each VM the user runs. I thought to ask the user for some kind of hardware ID and provide him with serial that is unique for his machine. But user can just copy the VM image and than have two machines running? So I thought of having a security dongle. But how can I prevent user from running two VM's on the same machine both connected to the same dongle? This should be only basic defense so that actual hacking will be required to breach the license and not only spinning one more VM.

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• How would you approach developers you don't already know as a developer to offer them a position? [closed]

  - by Kit Sunde

  We've been trying to find a second developer for the company and have posted job ads online but so far there have been no developers that have been interested, and only a single one that has some experience in Python (that failed a fairly basic practical). It seems like the it's really difficult to find decent people here in Singapore, even reasonable juniors that you can teach. I'm contemplating whether I should go reach out directly to people on Stack Overflow and github and in the hopes that they are interested. I'm thinking I would message the person with only a few sentences, stating the they seems capable from their online presence and that I'd like to work with them. Is this kosher? I know I dislike recruiters and unsolicited mail just as much as the next guy.

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• How selective do we need to be for an index to be used?

  - by TiborKaraszi

  You know the answer already: It depends. But I often see some percentage value quoted and the point of this post is to show that there is no such percentage value. To get the most out of this blog post, you should understand the basic structure for an index, i.e. how the b+ tree look like. You should also understand the difference between a clustered and a non-clustered index. In essence, you should be able to visualize these structures and searches through them as you read the text. If you find...(read more)

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• file:///cdrom/pool/main/k/klibc/klibc-utils_1.5.25-1ubuntu2_amd64.deb was corrupt

  - by curlyreggie

  I guess this is trivial and most commonly asked question, but I'd reiterate it again here as I'm not able to find a correct solution. I'm trying to install Ubuntu Cloud setup on VMWare using the package from http://download.ubuntu.com and have this basic installation setup issue as per the below image. file:///cdrom/pool/main/k/klibc/klibc-utils_1.5.25-1ubuntu2_amd64.deb was corrupt The issue is I cannot continue by skipping this as you know this happens to be the most important setup. How can I fix this? Help is sincerely appreciated.

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• Observer Pattern Implementation

  - by user17028

  To teach myself basic game programming, I am going to program a clone of Pong. I will use the Observer design pattern, with an interface between the input and the game engine. However, I'm not sure what the interface should do. One idea I had was for the input interface to tell the game engine that (e.g.) the screen was clicked, then to let the game engine decide what to do with that information (shoot a bullet, for example). Another idea I had was for the input interface, having caught the mouse click, to tell the game engine to shoot a bullet. Which method would be better for me to use?

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• Distributed cache and improvement

  - by philipl

  Have this question from interview: Web Service function given x static HashMap map (singleton created) if (!map.containsKey(x)) { perform some function to retrieve result y map.put(x, y); } return y; The interviewer asked general question such as what is wrong with this distributed cache implementation. Then asked how to improve on it, due to distributed servers will have different cached key pairs in the map. There are simple mistakes to be pointed out about synchronization and key object, but what really startled me was that this guy thinks that moving to database implementation solves the problem that different servers will have different map content, i.e., the situation when value x is not on server A but on server B, therefore redundant data has to be retrieved in server A. Does his thinking make any sense? (As I understand this is the basic cons for distributed cache against database model, seems he does not understand it at all) What is the typical solution for the cache growth issue (weak reference?) and sync issue (do not know which server has the key already cached - use load balancing)? Thanks

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• Bridging the gap between learning language fundamentals and actually making useful software?

  - by Anonymous -

  I'm learning C# via the "Essential C#" Lynda.com video tutorials and plan to read a couple of books that cover things in more depth afterwards. My question is where I should head to learn more after that? I've done things like project Euler in the past, but I find they don't really help me learn anything other than basic program control flow and features. I've looked at many open-source projects but pretty much everything still looks overwhelmingly complicated at this stage. What would you recommend I look at to help me build useful applications that are a bit beyond the millions of console applications I must've written thus-far? Should I be looking at books specifically on learning/working with the .NET framework, or just biting my lip and continue working through open source projects until they start to make sense?

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• Circular movement - eliminating speed ups near Y = 0

  - by Fibericon

  I have a basic algorithm to rotate an enemy around a 200 unit radius circle with center 0. This is how I'm achieving that: if (position.Y <= 0 && position.X > -200) { position.X -= 2; position.Y = 0 - (float)Math.Sqrt((200 * 200) - (position.X * position.X)); } else { position.X += 2; position.Y = (float)Math.Sqrt((200 * 200) - (position.X * position.X)); } It does work, and I've ensured that at no point does either X or Y equal NaN. However, when Y approaches 0, it seems to go significantly faster. This surprises me, because the Y values are locked to the X, which is being incremented by a steady amount. What can I do to smooth the speed?

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• compiz problems - no effects work, despite the fact that they seem to be properly configured

  - by user97551

  I've looked through some posts about compiz and either haven't found the answer, or haven't understood what's been said. Could someone help me out? I installed ubuntu 12.04 through windows 7 (so I can dual boot) and installed compiz and set up the settings I want (hotcorners etc). For a while it seemed like it was going fine, but then I restarted the laptop, none of the compiz settings were working and the auto-launcher wasn't even coming up when I passed cursor over it. The computer is still usable, when I 'dash home' the auto-launcher appears, and I can tab through windows but yeh... the auto-launcher and hotcorners I set up through compiz aren't working at all. Any ideas? Oh, whilst I'm super grateful for any help I can get, I'd really appreciate it if you could keep any instructions as basic as possible. I'm a bit new at this... THANK YOU!

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• What is the point in using real time?

  - by bobobobo

  I understand that using real time frame elapses (which should vary between 16-17ms on average) are provided by a lot of frameworks. GetTimeElapsedSinceLastFrame, and it gives you the wall clock time. But should we use this information in basic physics simulation? It looks to me to be a bad idea. Say there is a slight lag on the machine, for whatever reason (say a virus scanner starts up). The calculations all jump, and there is no need for this. Why not use a virtual second and ignore wall clock time? For gameplay on the level of Commander Keen, shouldn't you always use the virtual second and not real-time? (Besides stopwatch timing for race games) I don't see a need to use real time and not a fixed 16ms time step.

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• Do you need expensive servers and fancy hosting in order to make a multiplayer game?

  - by ThePlan

  I've finished working on an RPG and it would seem so much more fun to make it multiplayer. SFML has a networking feature, I figured it's possible but then again, never in my life have I even tried something basic about networking, in fact my knowledge of it is very limited. What would it take to make a multiplayer game resource-wise? I'm not talking about an MMO, more like a co-op type of game. Do I need mountains of cash to pay for hosting and servers and many many things to make one?

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• Is it okay to introduce LESS to not so savvy UI Designers?

  - by Jason Nathan

  I just got a job as lead developer and I thought it would be best to seek the expertise of my peers (that's you) before proceeding! I had the opportunity to review my designers and they are mostly photoshop pros with dreamweaver as their main HTML/CSS editor. A more visual experience. I, on the other hand, have had much experience hand-writing all my code. From HTML markup to CSS. From my understanding, my designers have basic CSS knowledge and I am considering a simple 101 style set of tutorials for them to get a better grasp of markup before I moved into more advanced topics like accessibility and microformat markup. We need to get started up quickly. Do you think it's okay to dive into LESS from the get-go?

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• A proper file monitoring tool for Windows with notifications

  - by nevvermind

  Developing in PHP, I'm usually confronted with various log files: apache, web apps, error logs etc. I'm currently using Notepad++ with the option to notify me when a file has changed. But when I need to monitor many files, I end up with too many tabs opened. I've used some of these, but they were lacking some basic stuff (like double clicking on the file to open it; oh, c'mon). What do you guys use for monitoring file changes? I needn't be "modern" or fancy. Just a simple "Hey, this file was changed. Here, click on it to open". (Maybe I'll end up making one myself, but I need to learn some more Java).

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• Is there a repository of game logic algorithms?

  - by New2This

  I'm writing my first 2D game, and I'm writing some tracking logic for the computer enemies. Basic follow-the-player tracking was easy, but ineffectual. Too easy to escape. So I'm trying to implement some more sophisticated flanking and other tactics, and (as expected) it's pretty tricky. This is a topic I know nothing about. I'm going to keep trying, but it'd be awesome to have some examples or tips to work off of. Is there any place that has a decent set of pseudocode AI algorithms, or tips or advice on the subject, e.g. for 2D tracking?

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