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• Interview question ranking FizzBuzz (1), implementing malloc (10)

  - by blrs

  I'd like to have your opinion on the difficulty of the following interview question: Find the subarray with maximum sum in an array of integers in O(n) time. This trivial sounding problem was made famous by Jon Bentley in his Programming Pearls where he uses it to demonstrate algorithm design techniques. On a scale of 1-10, 1 being the FizzBuzz (or HoppityHop) test and 10 being implement the C stdlib function malloc(), how would you rank the above problem? I think the people who can best answer this question are those who have read Programming Pearls and have tried to solve this problem on their own. To motivate those who haven't, 'Programming Pearls' gets featured many times in the 'Top 10 programming books' list.

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• Google I/O 2012 - YouTube Channels: Get with the Program!

  Google I/O 2012 - YouTube Channels: Get with the Program! Dror Shimshowitz, AJ Crane YouTube allows anyone to distribute videos to 800m web, mobile and TV viewers around the world. Come learn how to leverage this powerful platform to build an audience and market your products. We'll walk you through tips and techniques for building, programming, and promoting your very own YouTube channel. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 0 0 ratings Time: 53:11 More in Science & Technology

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• Just Finished My Presentation at SLO! (Central Coast Code Camp At Cal Poly)

  I love code camps!  This is my first time to San Luis Obispos Central Coast Code Camp and Im really enjoying it.  It started last night with the presenters dinner at a great local steak... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did 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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• What are interesting research questions with regards to open source software development? [closed]

  - by Aron Lindberg

  Imagine you have funding for a team of social scientists to study open source software development for a number of years (long time in software development, I know, but a short time for scientific research). These scientists have competencies to investigate psychological and sociological aspects of open source software development (i.e. how coders think, feel, and behave, along with how communities work or do not work). They are also technically equipped to understand code and coding, have access to all sorts of statistical and machine learning techniques, however their focus is on social aspects of open source software development, not technical. For you, as an open source software developer, what would be the research questions that would be interesting for you to have answered by such a group of scientists?

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• How to apply a filter to the screen of a running program?

  - by Shahbaz

  The idea is to take old games without modifying them, but have the graphics card apply a series of filters to their output before sending them to the monitor. A very crude example would be to take a game that has a resolution of 640x480 and do: Increase the resolution to 1280x960 Apply a blur (low pass filter) Apply a sharpen (1 + high pass filter) These steps may not necessarily be the best to improve the visuals of an old game, but there are a lot of techniques that are well-known in image processing for this purpose. The question is, do the (NVidia) graphics cards give the ability to load a program that modifies the screen before sending it to the monitor? If so, how are they called and what terminology should I use to search? I would be comfortable with doing the programming myself if this ability is part of a library. Also, would the solution be different between Windows and Linux? If so, either is fine, since most of the games are probably runnable by wine.

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• Good resources for learning about graphics hardware

  - by Ken

  I'm looking for some good learning resources for graphics hardware (and associated low level software). Basically I want to learn more about what goes on underneath the opengl/direcx API layers in terms of how things are implemented. I familiar with what happens in principle during the various stages of the rendering pipeline (viewing, projection, clipping, rasterization etc). My goal is to be able to make better and more informed decisions about tradeoffs and potential optimisations when graphics/shader programming with respect to the following kinds of issues; batching view culling occlusions draw order avoiding state changes triangles vs pointsprites texture sampling etc Basically whatever the graphics programmer needs to know about modern graphics hardware in order to become more effective. I'm not really looking for specific optimisation techniques, rather I need more general knowledge so that I will naturally write more efficient code.

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• How would one build a relational database on a key-value store, a-la Berkeley DB's SQL interface?

  - by coleifer

  I've been checking out Berkeley DB and was impressed to find that it supported a SQL interface that is "nearly identical" to SQLite. http://docs.oracle.com/cd/E17076_02/html/bdb-sql/dbsqlbasics.html#identicalusage I'm very curious, at a high-level, how this kind of interface might have been architected. For instance: since values are "transparent", how do you efficiently query and sort by value how are limits and offsets performed efficiently on large result sets how would the keys be structured and serialized for good average-case performance

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• pae kernel required for my cpu [closed]

  - by Edward Meyer

  Possible Duplicate: How can I install 12.04 on a non-PAE CPU? (error “Kernel requires features not present on the CPU: PAE”) Virtualbox install 12.04 guest: “pae not present” After loading ubuntu-12.04.1-desktop-i386.iso into my Oracle VM, the hard drive would not boot because the version for my cpu require the pae kernel. How do I insert the pae kernel or download a copy of ubuntu with the pae kernel?

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• InputLayout handling

  - by Kikaimaru

  Where are you supposed to store InputLayout? Suppose i have some basic structure like. class Mesh { List<MeshPart> MeshParts } class MeshPart { Effect Effect; VertexBufferBinding VertexBuffer; ... } Where should I store input layout? It's a connection between vertex buffer and specific pass, i can live with just 1 pass but I still have diffferent techniques so i need at least an array with some connection to effecttechniques, but I would appriciate something not crazy like dictionary. I could also create wrapper for Effect and EffectTechnique, but there must be some normal solution.

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• Refactoring While Programming

  - by Kirby

  When posed with a problem, particularly when it is complicated in nature, I try to take some time to think about the approach I am going to take to solve the problem. Despite this, what often happens is, as I am programming the solution, I start to think of details of the problem that I missed, and I adjust the code accordingly. What results is a mess of code that needs to be refactored. I want to "refactor as I go," but while it sounds easy enough to do, I have a really hard time doing it. When the detail that I missed is small, it is tempting to make a small update to my design, rather than erase what I've already written and write it the way it is supposed to be. It sounds like a question with an obvious answer, but are there any techniques to use to better "refactor as you go"? I know that this is a good principle, but I fail with it time and time again.

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• Keyword Generator Tool Gets Your Ahead of the Competition

  A keyword generator tool provides ideas that website owners and search engine optimizers use for site and engine optimization. Key phrase generators rely on search query popularity from introductory keywords to a more complex keyword search management to drive more traffic to a website. It maximizes prospective and potential high-traffic keywords and integrates it with your sites campaign techniques. Keyword generator tool allows you to manage and add "exact match" and "phrase match" keywords to your lists, also allows you to create misspellings, combine and reverse keywords then automatically calculates the ad group focus score of your keyword lists.

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• Forking an open source project using Git

  - by Cromulent

  There is an open source project that I want to fork for my own reasons. It currently has a Git mirror of its main SVN repository which I can use. What are the best techniques for forking a project whilst still maintaining the ability to merge future changes from the original project into your own forked repository using Git? Please note I will not be using Github at all for development so using any features from that is out of the question. The project will be hosted on a private VPS.

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• OpenSolaris Lives! Nexenta Leverages OpenSolaris and ZFS for Enterprise Storage

  <b>Enterprise Storage Forum: </b>"While Sun Microsystems may have struggled with making money from its OpenSolaris operating system prior to Sun's acquisition by Oracle, that doesn't mean that others haven't had better success."

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• Procedural Planets, Heightmaps and Textures

  - by henryprescott

  I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM related. At the momement I am drawing a cube with VBOs and mapping onto a sphere. I am familiar with most fractal heightmap generating techniques and have already implemented my own version of midpoint displacement(not that useful in this case I know). My question is, what is the best way to procedurally generate the heightmap. I have looked at libnoise which allows me to make tilable heightmaps/textures, but as far as I can see I would need to generate a net like this. Leaving the tiling obvious. Could anyone advise me on the best route to take? Any input would be much appreciated. Thanks, Henry.

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• La cinématique 2D et 3D, un article de Thibaut Cuvelier

  Bonjour, La physique, ce n'est pas seulement utiliser un moteur qui fait tous les calculs sans qu'on doive y réfléchir un tant soit peu. Comment un tel moteur peut-il fonctionner ? Sur quoi se base-t-il ? Cet article ne répondra pas aux questions techniques sur la conception du moteur, juste sur les notions qu'il modélise. Avant d'entamer des concepts plus avancés, voici la cinématique, la base de la mécanique, avec une seule dimension. La cinématique, des mouvements monodimensionnels Bonne lecture !...

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• HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS

  - by Jason Faulkner

  Even if you’ve only loosely followed the events of the hacker groups Anonymous and LulzSec, you’ve probably heard about web sites and services being hacked, like the infamous Sony hacks. Have you ever wondered how they do it? There are a number of tools and techniques that these groups use, and while we’re not trying to give you a manual to do this yourself, it’s useful to understand what’s going on. Two of the attacks you consistently hear about them using are “(Distributed) Denial of Service” (DDoS) and “SQL Injections” (SQLI). Here’s how they work. Image by xkcd HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed How to Run Android Apps on Your Desktop the Easy Way

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• Anti-depressant and programming: does it reduce your thinking and focusing abilities ?

  - by user12358

  I wanted to ask your opinion on anti-depressants, since I took them daily for 3 years now, but I can't be sure if I'm less perfomant with them or without, since I never withdrawed. I'm still at school at the age of 25, still having some motivation problems (for example I can't get used to do something at school if I don't think it will teach me something), but I'm quite motivated to work in the video-game field, since I have some personnal projects in mind. I know C++ programming etc, I'm still learning techniques, but do you think I should try more to do my project instead of just following the work I'm assigned to ? Have you had experience with depression or anti-depressants ? How did it affect your work ? Do you think that being depressed or half-depressed can improve creativity ? Do you feel it has affected the way you end up writing your algorithms ? EDITED

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• Good technologies for developing a modular server component in .net?

  - by nubbers

  I am using WPF, Prism and Unity to develop the user interface for a .net application. The UI will run from a PC, but I also need to develop a separate complex server component that will provide services to the PC component via WCF. Prism and Unity have proved to be of great value in creating a modular application, at least as far as the user interface is concerned. I would also like to make the server component modular, but I cannot find anywhere what techniques, patterns and technologies are suitable. I have considered: Unity or one of the other DI containers Selected parts of Prism, such as modules and events Are these suitable for developing a modular server component? Or are these UI technologies only and should I be looking at something completely different?

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• Free book from Microsoft: - Exploring CQRS and Event Sourcing

  - by TATWORTH

  At http://www.microsoft.com/en-us/download/details.aspx?id=34774, Microsoft are providing a free book on Exploring CQRS and Event Sourcing"This guide is focused on building highly scalable, highly available, and maintainable applications with the Command & Query Responsibility Segregation and the Event Sourcing architectural patterns. It presents a learning journey, not definitive guidance. It describes the experiences of a development team with no prior CQRS proficiency in building, deploying (to Windows Azure), and maintaining a sample real-world, complex, enterprise system to showcase various CQRS and ES concepts, challenges, and techniques. The development team did not work in isolation; we actively sought input from industry experts and from a wide group of advisors to ensure that the guidance is both detailed and practical. "

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• Construct sentences from tabular data

  - by Sumeet

  I have a huge set of html files an have to retrieve the meaningful information from them. Most of the task is accomplished, now the problem is with HTML tables. I have some literature on how to extract meaningful tables from html, but my problem is with creating meaningful sentences from tabular data (or attribute value pairs extracted from a table). Are there any NLP/Machine learning techniques to do this? Here is what I expect. Suppose below is a sample table: col_Name: Sumeet col_year: 2011 col_winner: quiz Can this be made to something meaningful like "Sumeet won quiz in 2011"?

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• Designing extensible, interactive systems

  - by vemv

  Steve Yegge's The Pinoccio Problem describes a very special type of program: one that not only fulfills the original purpose of its creators, but also is capable of performing arbitrary, user-defined computations. They typically also host a console, by which one can reprogram the software on runtime, maybe persisting the modifications. I find this problem very hard to reason about - there seems to be a conflict between implementing the 'core modules' of a program, and making the system really implementation-agnostic (i.e. no functionality is hard-coded). So, how to architecture such a program - what techniques can help? Is it a well-studied topic?

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• How best to merge/sort/page through tons of JSON arrays?

  - by Joshiatto

  Here's the scenario: Say you have millions of JSON documents stored as text files. Each JSON document is an array of "activity" objects, each of which contain a "created_datetime" attribute. What is the best way to merge/sort/filter/page through these activities via a web UI? For example, say we want to take a few thousand of the documents, merge them into a gigantic array, sort the array by the "created_datetime" attribute descending and then page through it 10 activities at a time. Also keep in mind that roughly 25% of these JSON documents are updated every day, and updates have to make it into the view within 5 minutes. My first thought is to parse all of the documents into an RDBMS table and then it would just be a simple query such as "select top 10 name, created_datetime from Activity where user_id=12345 order by created_datetime desc". Some have suggested I use NoSQL techniques such as hadoop or map/reduce instead. How exactly would this work? For more background, see: Why is NoSQL better for this scenario?

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• ASP.NET RedirectPermanent Method using C# and VB.NET

  301 redirection is essential for the best user experience. If something on your website has been changed or moved to a new permanent location, users will need to be permanently redirected. In addition, search engines can follow this type of redirection, and this redirected-to page will now be the one to rank in Google or other search engines, replacing the old page. There are different ways to implement the RedirectPermanent method. This tutorial will illustrate these common techniques with sample VB.NET or C# code. Creating the Sample ASP.NET 4.0 Website RedirectPermanent is new in ASP.NET 4....

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• Rendering only a part of the screen in high detail

  - by Bart van Heukelom

  If graphics are rendered for a large viewing angle (e.g. a very large TV or a VR headset), the viewer can't actually focus on the entire image, just a part of it. (Actually, this is the case for regular sized screens as well.) Combined with a way to track the viewer's eyes, you could theoretically exploit this and render the graphics away from the viewer's focus with progressively less details and resolution, gaining performance, without losing perceived quality. Are there any techniques for this available or under development today?

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• Upgrading Office 2007 to Office 2010, First Look

  In this post, Im going to simply document the process of updating my MIcrosoft Office 2007.  As almost anyone knows who has not been hiding under a rock, Microsoft Office 2010 has been in the... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did 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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