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• What's a good, quick algorithms refresh?

  - by Casey Patton

  I have programming interviews coming up in a couple weeks. I took an algorithms class a while ago but likely forgot some key concepts. I'm looking for something like a very short book (< 100 pages) on algorithms to get back up to speed. Sorting algorithms, data structures, and any other essentials should be included. It doesn't have to be a book...just looking for a great way to get caught up in about a week. What's the best tool for a quick algorithms intro or refresher?

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• Interviewing a DBA

  - by kev

  Our Company is in the Process of recuiting a DBA. I have built a group test of questions from basic questions such as Pk and Fk constraints, simple querries(fizzbuzz style) to more advanced things such as indexes, Collation, isolation levels and how to trace deadlocks. However, that is the limit of my knowledge. So my question to all the DBA's is what is the base level knowledge that all DBA's should have? We are really looking for someone that will be able to manage our replication, analyzing some of our slower running queries(that the devs can go to for help) and someone that can trace some of the deadlock issues that we are having. Any help would be most appreciated!

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• Entity Component System, weapon

  - by Heorhiy

  I'm new to game programming and currently trying to understand Entity Component System design by implementing simple 2d game. By ECS I mean design, described here for example In my game I have different kind of weapons: automatic, gun, grenade, etc... Each type of weapon has it's own affect area (gun shots along the straight line and grenade explodes and covers some spherical area) , damage impact, visual effect and bullet amount, delay between shots. So I don't completely understand how to implement weapons. Should weapon be an Entity or it should be a component? And how the player should pick up a weapon, switch between different types of weapons and etc.

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• Finding shortest path on a hexagonal grid

  - by Timothy Mayes

  I'm writing a turn based game that has some simulation elements. One task i'm hung up on currently is with path finding. What I want to do is, each turn, move an ai adventurer one tile closer to his target using his current x,y and his target x,y. In trying to figure this out myself I can determine 4 directions no problem by using dx = currentX - targetY dy = currentY - targetY but I'm not sure how to determine which of the 6 directions is actually the "best" or "shortest" route. For example the way its setup currently I use East, West, NE, NW, SE, SW but to get to the NE tile i move East then NW instead of just moving NW. I hope this wasn't all rambling. Even just a link or two to get me started would be nice. Most of the info i've found is on drawing the grids and groking the wierd coordinate system needed. Thanks in advance Tim

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• 2D XNA Tile Based Lighting. Ideas and Methods

  - by Twitchy

  I am currently working on developing a 2D tile based game, similar to the game 'Terraria'. We have the base tile and chunk engine working and are now looking to implement lighting. Instead of the tile based lighting that terraria uses, I want to implement point lights for torches, etc. I have seen Catalin Zima’s shader based shadows, and this would be perfect for the torches (point lights). My problem here is that the tiles on the surface of the world need to be illuminated, doing this by a big point light is firstly extremely expensive, but also doesn't look right. What I need help with (overall) is... To have a surface that is illuminated regardless of torches, etc. To also have point lights, or smooth tile lighting similar to Catalin Zima’s shader based shadows. Looking forward to your replies. Any ideas are appreciated.

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• How can I generate a navigation mesh for a tile grid?

  - by Roflha

  I haven't actually started programming for this one yet, but I wanted to see how I would go about doing this anyway. Say I have a grid of tiles, all of the same size, some traversable and some not. How would I go about creating a navigation mesh of polygons from this grid? My idea was to take the non-traversable tiles out and extend lines from there edges to make polygons... that's all I have got so far. Any advice?

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• Should I update blog posts or rewrite them as technology (and me) changes?

  - by Rachel

  I started a programming blog earlier this year, and since I started it some things have changed. Some changes are due to technology changing, some changes are due to my code libraries improving, and some (ok, probably most) are due to me changing as I learn more. I want to go back and completely re-write certain blog posts. Is it better to rewrite posts to remove old information and update them with new stuff, or to create entirely new posts and possibly take down old ones? I'm not talking about small changes to the code, or an extra few sentences, but complete rewrites with new code, new information, etc. Some things to consider are comments on the post, subscribers who receive updates when new posts are created, and user bookmarks.

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• ubuntu is very slow

  - by johnny smithens

  Hello all. I am new with Ubuntu, and it is very slow(even in Ubuntu 2D). The performance is degraded for almost any task. I just reinstalled with amd64, and tried updating the Nvidia drivers with Nvidia Xserver. but it made no difference. This is the output of free -m: total used free shared buffers cached Mem: 3006 1318 1688 0 61 699 -/+ buffers/cache: 556 2449 Swap: 3064 0 3064 tl;dr - total: 3006, used: 1318 When I see the virtual console with Ctrl+Alt+F2, I see constantly: Assuming Drive Cache: write through; asking for cache data failed; It is very frustrating. Thanks in advance!

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• Améliorer la pertinence des réponses aux demandes clients et réduire les DMT*

  - by Valérie De Montvallon

  Le Knowledge Management pour améliorer la pertinence des réponses aux demandes clients et réduire les DMT Avec le témoignage de SFR Lundi 2 juillet de 8h30 à 10h30 à l’Automobile Club de France, Paris Web, appel vocal, rendez-vous en agence, vos clients s'attendent aujourd’hui à obtenir une réponse unique, pertinente et rapide, quel que soit le canal de contact. Vos conseillers clients et vos agents ont besoin d'avoir accès facilement à l'information nécessaire. La volumétrie des données utilisées par les services de relation clients (centres de contacts, vendeurs en magasin, community manager…) est impressionnante, mixant souvent plusieurs sources d’information et nécessitant des recherches sémantiques. Rendez-vous le 2 juillet pour découvrir comment un outil de Knowledge Management permet d’optimiser la pertinence des résultats de recherche. Au cours de cette matinée d’échanges, Jocelyn Aubry, DSI Relation Client Grand Public chez SFR, partagera son expérience d'intégration de la solution Oracle InQuira pour constituer une base de connaissance unique et cross-canal, au service de ses conseillers clients. Inscription : [email protected]

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• Inserting multiple links to one image in Confluence

  - by Simon

  I am setting up a Wiki in Confluence v3.5.1 I have added a visio diagram (JPG) to a page (this diagram will take up most of the page) - This diagram depicts the workflow between developers and support and clients. I envisage users being able to click on different parts of the diagram and it to open up child pages with more details about that particular process (with videos on 'how-to' do that specific task, like log issues in Jira) However, from what I can see, there is no way from the Confluence editor to add multiple links to the one image, right? I looked at Anchors, but this does not look like it will do the job. So, what is the best option? I remember Dreamweaver having these sorts of tools built in, and there appears to be other utilities that can help put in image map HTML tags, but I cannot see a way of easily editing the HTML in Confluence editor. Also worried about the headache this could cause with managing future changes of the page.

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• Is there a constant for "end of time"?

  - by Nick Rosencrantz

  For some systems, the time value 9999-12-31 is used as the "end of time" as the end of the time that the computer can calculate. But what if it changes? Wouldn't it be better to define this time as a builtin variable? In C and other programming languages there usually is a variable such as MAX_INT or similar to get the largest value an integer could have. Why is there not a similar function for MAX_TIME i.e. set the variable to the "end of time" which for many systems usually is 9999-12-31. To avoid the problem of hardcoding to a wrong year (9999) could these systems introduce a variable for the "end of time"?

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• Detecting controls of a winform

  - by Ayush Saxena

  I have a circular area cursor which is a circular winform(translucent) hooked to a cursor. On click, I want to get hold of the controls in the region of the parent winform just below the area of the cursor/form. These controls have to be arranged in circular layout on a different form. I am working on C#.NET. Please tell how to access the controls of a winform and change their positions in context with my application described above. Like what classes, procedure , resources i need. I am a newbie but desperate to complete this task.thanks in advance.

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• Is there a language between C and C++?

  - by Robert Martin

  I really like the simple and transparent nature of C: when I write C code I feel unencumbered by "leaky abstractions" and can almost always make a shrewd guess as to the assembly I'm producing. I also like the simple, familiar syntax for C. However, C doesn't have these simple, helpful doodads that C++ offers like classes, simplified non-cstring handling, etc. I know that it's all possible to implement in C using jump tables and the like, but that's a bit wordy at times, and not very type-safe for various reasons. I'm not a fan of the over-emphasis on objects in C++, though, and I'm gun shy of the 'new' operator and the like. C++ seems to have just a few too many hiccups to, for instance, be used as a system programming language. Does there exist a language that sits between C and C++ on the scale of widgets and doodads? Disclaimer: I mean this as purely a factual question. I do not intend to anger you because I don't share your view that C{,++} is good enough to do whatever I'm planning.

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• Does md2 support skeletal meshes?

  - by jsvcycling

  I'm creating an FPS game. I'm writing my own game engine. So far all the backend stuff is going great. I'd like to support md2 as the native file format for 3D Objects, but I also want to use skeletal meshes. Does anyone know if the md2 file format supports skeletal meshes? In-case you need to know, I'm going to use blender as my Mesh creation tool and C++ as my programming language... Thanks For got to mention, the engine is based on OpenGL... Alright, for anyone who is reading this, I just found the Doom 3 md5 specifications (http://tfc.duke.free.fr/coding/md5-specs-en.html). It gives you some help on writing a parser (see bottom of link), but the example doesn't support lighting and texture mapping (the second set of example code allows for animation). Thanks @Neverender for answering my question...

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• LA SPÉCIALISATION POUR SE DIFFÉRENCIER ET ÊTRE VALORISÉ

  - by michaela.seika(at)oracle.com

  Software. Hardware. Complete. inside the Click Here The order you must follow to make the colored link appear in browsers. If not the default window link will appear 1. Select the word you want to use for the link 2. Select the desired color, Red, Black, etc 3. Select bold if necessary ___________________________________________________________________________________________________________________ Templates use two sizes of fonts and the sans-serif font tag for the email. All Fonts should be (Arial, Helvetica, sans-serif) tags Normal size reading body fonts should be set to the size of 2. Small font sizes should be set to 1 !!!!!!!DO NOT USE ANY OTHER SIZE FONT FOR THE EMAILS!!!!!!!! ___________________________________________________________________________________________________________________ --     LA SPÉCIALISATION  POUR SE DIFFÉRENCIER ET ÊTRE VALORISÉ       Le marché nous demande de plus en plus de solutions et d’engagements. Pour bâtir ces solutions nous nous appuyons sur vous, Partenaires Oracle. En matière d’engagements, Oracle se doit de communiquer auprès du marché quant à la spécialisation de ses partenaires, sur leurs compétences en fonction des projets que les clients nous demandent d’adresser. Plus de 50 spécialisations sont à ce jour disponibles pour les partenaires Gold, Platinum et Diamond : • Sur les produits Technologiques tels que la Base de Données, les options de la Base, la SOA, la Business Intelligence, … • Sur les produits Applicatifs, tels que l’ERP, le CRM, … • Sur les produits Hardware, les Systèmes d’exploitation. Afin de vous aider à vous spécialiser et donc à vous certifier, nos 2 distributeurs à valeur ajoutée, Altimate et Arrow ECS, vous assistent dans cette démarche. ALTIMATE vous propose de participer Lunch & Spécialisation tour Profitez de ces dispositifs qui sont mis en place pour vous afin de vous spécialiser et profiter de tous les bénéfices auxquels vous donne accès la spécialisation. ARROW ECS vous propose de participer : L'Ecole de la spécialisation Oracle by Arrow Profitez de ces dispositifs qui sont mis en place pour vous afin de vous spécialiser et profiter de tous les bénéfices auxquels vous donne accès la spécialisation. Oracle Solutions Tour Découvrez la solution Oracle lors de ce tour de France. Au programme :  roadmaps, ateliers produits et solutions, certifications     BÉNÉFICES en savoir + • l’engagement d’Oracle aux côtés des partenaires pour adresser les grands dossiers • la visibilité auprès des clients pour être identifié comme Expert sur une offre, reconnu et validé par Oracle • le support (accès support gratuit), Oracle University (vouchers pour certifier gratuitement vos équipes de Consultants Implementation) • les budgets Marketing (lead generation, création de campagnes Marketing, être sponsor d’événements clients)   Différenciez-vous en vous spécialisant sur votre domaine d’expertise et accélérez votre succès ! Oracle et ses Distributeurs à Valeur Ajoutée     Eric Fontaine Directeur Alliances & Channel Technologie Europe du Sud vous présente en vidéo la spécialisation et ses avantages.                                         CONTACTS : ORACLE Jean-Jacques PanissiéOracle Partner Development A&C Technology +33 157 60 28 52 ALTIMATE Sophie Daval +33 1 34 58 47 68 ARROW [email protected] +33 1 49 97 59 63          

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• The Basics of Project Management / Software Development

  - by Sam

  It suddenly struck me today that I have never developed any large application or worked with a team of programmers, and so am missing out a lot - both in terms of technical knowledge and the social-fun part of it. And I would like to rectify that - an idea is to start an open source group by training college students (for no charge) and developing some open source application with them. Please give me some basic advice on the whole process of how to (1) plan and (2) manage projects in a team. What new skill sets would you recommend? (I have read joel on software and 37 Signals, and got many insightful tips from them. But I'd like a little more technical knowledge ...) Background (freelancer, past 4+ years) - Computer engineer graphic / web designer online marketing moved on to programming in PHP, Perl, Python did Oracle DBA OCP training to understand DB's current self-assigned title - web application developer.

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• Software Craftsman Pilgrimage Comes Together

  - by Liam McLennan

  Last week on Software Craftsman Pilgrimage I was trying to organise where I will be travelling, and the companies I will be pairing with. I now have a confirmed itinerary. 9 - 11th April Alt.NET Seattle 12th April Craftsman visit with Didit (Long Island) 13th April rest day :) 14th April Craftsman visit with Obtiva (Chicago) 15th – 16th April Craftsman visit with 8th Light (Chicago) 17th – 18th April Seattle Code Camp I am looking forward to all of my visits and talking to all the smart people who work there. I will be blogging my progress and hopefully shooting some video. If you are in Seattle, New York or Chicago and would like to meet up to chat about craftsmanship, programming, ruby or .NET please email me.

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• Oracle ETPM is renamed Oracle Public Sector Revenue Management (PSRM)

  - by Rick Finley

  We are excited to announce to that with the upcoming release of v2.4, we are renaming ETPM to Oracle Public Sector Revenue Management (Oracle PSRM).  This is a pure name change, and all terms and conditions for existing customer licensing remain unchanged.  We feel that this updated naming is a better reflection of our current customer base, which includes tax revenue for many Departments of Revenue, as well as agencies that at manage non-tax revenue, such as regulatory fees, loans, and social benefits.    Please note, as part of this name change, related products in the Oracle ETPM family, such as Oracle Tax Analytics, and Oracle ETPM Self Service, will be renamed at their next major product release to align to the Oracle PSRM theme.   

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• SQL Saturday #39 in NYC

  - by roman

  This weekend I will be speaking at the NYC SQL Saturday . The whole event was supposed to be BI focused but now the schedule shows a lot of non BI stuff as well. I will be presenting SQL Server 2008 Reporting Services Programming , one of my favorite topics to present on. It seems that the event if fully booked. I'll be coming down on my bike taking scenic roads through MA and CT so I will not make it to the speaker dinner. But the forecast looks good so I am pretty psyched to finally venture out...(read more)

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• Do programmers at non-software companies need the same things as at software companies?

  - by Michael

  There is a lot of evidence that things like offices, multiple screens, administration rights of your own computer, and being allowed whatever software you want is great for productivity while developing. However, the studies I've seen tend toward companies that sell software. Therefore, keeping the programmers productive is paramount to the company's profitability. However, at companies that produce software simply to support their primary function, programming is merely a support role. Do the same rules apply at a company that only uses the software they produce to support their business, and a lot of a programmer's work is maintainence?

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• How should calculations be handled in a document database

  - by Morten

  Ok, so I have a program that basically logs errors into a nosql database. Right now there is just a single model for an error and its stored as a document in the nosql database. Basically I want to summarize across different errors and produce a summary of the "types" of errors that occured. Traditionally in a SQL database the this normalization would work with groupings, sums and averages but in a NoSQL database I assume I need to use mapreduce. My current model seems unfit for the task, how should I change the way I store "models" in order to make statistical analysis easy? Would a NoSQL database even be the right tool for this type of problem? I'm storing things in Google AppEngine's BigTable, so there are some limitations to think of as well.

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• Multi database link and mix and match email alert

  - by menardmam

  I have a site which is a large database of people that have different knowledge in different domains, such as teaching (maths, french, science etc...) On the site there is a page where you can search people base on different request, such as distance from home, grade, sex. Now, I would like to add a page where people that are looking for mentor will fill a request, and when a tutor in his area of search will match request, a email will be send to this researcher. Because I know for sure, that when in January you look for a math teacher for your 10 year old son, and you find none, you won't go again in February, March... and on and on just to see. Maybe there is one now, you want to be informed when the tutor will get into database automatically (more or less like www.jobboom.com) So the question is, what CMS do I need to be able to do that ? Wordpress, drupal or something custom made?

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• SharePoint 2010 Hosting :: HTTP Error 503. The Service in Unavailable.

  - by mbridge

  Error Message: HTTP Error 503. The service in unavailable. The application pool is shutdown and the Event Viewer indicates: Log Name:      Application Source:        Microsoft-Windows-User Profiles Service Date:          4/24/2010 4:58:28 PM Event ID:      1500 Task Category: None Level:         Error Keywords: User:          GUERILLA\spapppool Computer:      SPS2010RTM.guerilla.local Description: Windows cannot log you on because your profile cannot be loaded. Check that you are connected to the network, and that your network is functioning correctly. DETAIL – Unspecified error Solution: Option 1 – Log on locally with the service account once to create a local profile for it. Option 2 - Modify the application pool by going into IIS > Application Pools > Right-Click offending app pool > Advanced Settings > Set “Load User Profile” to False. Give it try!! Good luck!!

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• F# open source project hosting using SVN

  - by Stephen Swensen

  Hi all, I'm looking to choose open source project hosting site for an F# project using SVN. CodePlex is where the .NET community in general and most F# projects are hosted, but I'm worried TFS + SvnBridge is going to give me headaches. So I'm looking elsewhere and seeking advice here. Or if you think CodePlex is still the best choice in my scenario, I'd like to hear that too. So far, Google Code is looking appealing to me. They have a clean interface and true SVN hosting. But there are close to no F# projects currently hosted (it's not even in their search by programming language list), so I'm wondering if there are any notable downsides besides the lack of community I might encounter. If there is yet another option, I'd like to hear that too. Thanks!

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• Why do operating systems do low level stuff in C and C++? Why not just C++?

  - by Cole Johnson

  On the Wikipedia page for Windows, it states the Windows is written in Assembly for the bootloader and task switcher, and C and C++ for kernel routines. This confuses me because AFAIK, you can call C++ functions from an extern "C"'d block as C++ is just C with extra features (all of which can be rewritten in C if you wanted to AFAIK). I can get using C for the kernel functions so pure C apps can use them (like printf and such), but if they can just be wrapped in an extern "C " block, then why code in C? So my question is: Why would a kernel be written in both C and C++ instead of just C++

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