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  • Extreme Optimization Numerical Libraries for .NET – Part 1 of n

    - by JoshReuben
    While many of my colleagues are fascinated in constructing the ultimate ViewModel or ServiceBus, I feel that this kind of plumbing code is re-invented far too many times – at some point in the near future, it will be out of the box standard infra. How many times have you been to a customer site and built a different variation of the same kind of code frameworks? How many times can you abstract Prism or reliable and discoverable WCF communication? As the bar is raised for whats bundled with the framework and more tasks become declarative, automated and configurable, Information Systems will expose a higher level of abstraction, forcing software engineers to focus on more advanced computer science and algorithmic tasks. I've spent the better half of the past decade building skills in .NET and expanding my mathematical horizons by working through the Schaums guides. In this series I am going to examine how these skillsets come together in the implementation provided by ExtremeOptimization. Download the trial version here: http://www.extremeoptimization.com/downloads.aspx Overview The library implements a set of algorithms for: linear algebra, complex numbers, numerical integration and differentiation, solving equations, optimization, random numbers, regression, ANOVA, statistical distributions, hypothesis tests. EONumLib combines three libraries in one - organized in a consistent namespace hierarchy. Mathematics Library - Extreme.Mathematics namespace Vector and Matrix Library - Extreme.Mathematics.LinearAlgebra namespace Statistics Library - Extreme.Statistics namespace System Requirements -.NET framework 4.0  Mathematics Library The classes are organized into the following namespace hierarchy: Extreme.Mathematics – common data types, exception types, and delegates. Extreme.Mathematics.Calculus - numerical integration and differentiation of functions. Extreme.Mathematics.Curves - points, lines and curves, including polynomials and Chebyshev approximations. curve fitting and interpolation. Extreme.Mathematics.Generic - generic arithmetic & linear algebra. Extreme.Mathematics.EquationSolvers - root finding algorithms. Extreme.Mathematics.LinearAlgebra - vectors , matrices , matrix decompositions, solvers for simultaneous linear equations and least squares. Extreme.Mathematics.Optimization – multi-d function optimization + linear programming. Extreme.Mathematics.SignalProcessing - one and two-dimensional discrete Fourier transforms. Extreme.Mathematics.SpecialFunctions

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  • Logarithmic spacing of FFT bins

    - by Mykel Stone
    I'm trying to do the examples within the GameDev.net Beat Detection article ( http://archive.gamedev.net/archive/reference/programming/features/beatdetection/index.html ) I have no issue with performing a FFT and getting the frequency data and doing most of the article. I'm running into trouble though in the section 2.B, Enhancements and beat decision factors. in this section the author gives 3 equations numbered R10-R12 to be used to determine how many bins go into each subband: R10 - Linear increase of the width of the subband with its index R11 - We can choose for example the width of the first subband R12 - The sum of all the widths must not exceed 1024 He says the following in the article: "Once you have equations (R11) and (R12) it is fairly easy to extract 'a' and 'b', and thus to find the law of the 'wi'. This calculus of 'a' and 'b' must be made manually and 'a' and 'b' defined as constants in the source; indeed they do not vary during the song." However, I cannot seem to understand how these values are calculated...I'm probably missing something simple, but learning fourier analysis in a couple of weeks has left me Decimated-in-Mind and I cannot seem to see it.

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  • Logarithmic spacing of FFT subbands

    - by Mykel Stone
    I'm trying to do the examples within the GameDev.net Beat Detection article ( http://archive.gamedev.net/archive/reference/programming/features/beatdetection/index.html ) I have no issue with performing a FFT and getting the frequency data and doing most of the article. I'm running into trouble though in the section 2.B, Enhancements and beat decision factors. in this section the author gives 3 equations numbered R10-R12 to be used to determine how many bins go into each subband: R10 - Linear increase of the width of the subband with its index R11 - We can choose for example the width of the first subband R12 - The sum of all the widths must not exceed 1024 He says the following in the article: "Once you have equations (R11) and (R12) it is fairly easy to extract 'a' and 'b', and thus to find the law of the 'wi'. This calculus of 'a' and 'b' must be made manually and 'a' and 'b' defined as constants in the source; indeed they do not vary during the song." However, I cannot seem to understand how these values are calculated...I'm probably missing something simple, but learning fourier analysis in a couple of weeks has left me Decimated-in-Mind and I cannot seem to see it.

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  • How do audio based games such as Audiosurf and Beat Hazard work?

    - by The Communist Duck
    Note: I am not asking how to make a clone of one of these. I am asking about how they work. I'm sure everyone's seen the games where you use your own music files (or provided ones) and the games produce levels based on them, such as Audiosurf and Beat Hazard. Here is a video of Audiosurf in action, to show what I mean. If you provide a heavy metal song, you would get a completely different set of obstacles, enemies, and game experience from something like Vivaldi. What does interest me is how these games work. I do not know much about audio (well, data-side), but how do they process the song to understand when it is settling down or when it's speeding up? I guess they could just feed the pitch values (assuming those sorts of things exist in audio files) to form a level, but it wouldn't fully explain it. I'm either looking for an explanation, some links to articles about this sort of thing (I'm sure there's a term or terms for it), or even an open-source implementation of this kind of thing ;-) EDIT: After some searching and a little help, I found out about FFT (Fast Fourier Transform). This maybe a step in the right direction, but it is something that does not make any sense to me..or fits with my physics knowledge of waves.

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  • CPU Test Similar to Memtest?

    - by Nick Whaley
    I need an easy way to do system stability tests. I have come to rely on Prime95 which does a fantastic job of proving stability (or instability) very quickly; but it requires an OS installed. I would like something like Prime95 that stresses both CPU and RAM (maybe PCI-Ex bus also?) but runs in a nice bootable binary like Memtest86+ does, so I can boot it from a thumbdrive. Does such a thing exist?

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  • Any large USB sticks with integrated card readers?

    - by Al
    I have one of Kingston's DataTraveller Micro Reader USB sticks, a fantastic memory stick with an integrated micro SD and M2 card reader. However, I've gradually filled it to the brim and am looking for a larger stick. Unfortunately, Kingston don't make them any bigger than the 4GB one that I currently have and I was hoping to go to 16GB now that they've come down in price. Does anyone know if any manufacturers make something similar: a 16GB stick with a micro SD card reader integrated (I'm not bothered about the M2 reader).

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  • Is there a remote desktop management tool that I can email to people?

    - by Matt 'Trouble' Esse
    I often need to remotely manage PC and Macs for desktop support. I'm after a remote desktop management support tool that I could email (or send a url) that the customer could click on (or run) and I could then remotely manage their PC/Mac A tool that could work on both operating systems would be great but not mandatory (a separate tool for both/either will suffice) A tool that has an iPhone App would be fantastic too but this would just be very much a 'wish list' Looking forward to your suggestion!

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  • What is the best SVN client for Windows?

    - by Nick
    I am familiar with using both Versions and Cornerstone on Mac - they are fantastic and incredibly simple to use... but I don't want to always rely on being able to borrow my girlfriend's MacBook so need to find an alternative for my Windows machine. Can anyone please recommend a good subversion client? I have experimented using Tortoise and RapidSVN and couldn't even get them working :( I'd like something just incredibly simple if possible. Thank you!

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  • CPU Test Similar to Memtest?

    - by Nick Whaley
    I need an easy way to do system stability tests. I have come to rely on Prime95 which does a fantastic job of proving stability (or instability) very quickly; but it requires an OS installed. I would like something like Prime95 that stresses both CPU and RAM (maybe PCI-Ex bus also?) but runs in a nice bootable binary like Memtest86+ does, so I can boot it from a thumbdrive. Does such a thing exist?

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  • Lighttpd Prepending Strings to Certain Files.

    - by Kyle
    I have a Mint install (Fantastic stats, if you were wondering) and I would like to move over to Lighttpd for my server needs. Unfortunatly, this means that php_auto_prepend is no longer easily available. I understand that PHP can do this in the php.ini file, but I have areas that can't have this value prepended so that's out of the question. Is there a lighttpd way to prepend my script for my mint install in some files, and have it disabled for others?

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  • Making many network shares appear as one

    - by jimbojw
    Givens: disk is cheap, and there's plenty lying around on various computers around the corporate intranet redundant contiguous large storage volumes are expensive Problem: It would be fantastic to have a single entry point (drive letter, network path) that presents all this space as one contiguous filesystem, effectively abstracting the disk and network architecture from the paths presented to users. Does anyone know how to implement such a solution? I'm open to Windows and non-windows solutions, free and proprietary.

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  • Commercial Software Development – my presentation for DDD Scotland now available for download

    - by Liam Westley
    Thanks to everyone who voted me onto the DDD Scotland agenda, and for the fantastic audience some of whom you can see in Craig Murphy's photos of the event, http://www.flickr.com/photos/craigmurphy/4592461745/in/set-72157624025673156 http://www.flickr.com/photos/craigmurphy/4592467645/in/set-72157624025673156 I hope those who came enjoyed the session had a good time, and for them or those who were on one of the other tracks, or who couldn’t squeeze in; I’ve uploaded the presentation for you to download.  I created a more simple, and smaller, PowerPoint without all the fancy animations and video clips, which is available as a compressed ZIP file,   http://www.tigernews.co.uk/blog-twickers/dddscot/commercialsoftwaredev.zip I also printed the presentation with speaker notes (which contain most of the information I was talking about) using PDFCreator, which is available as an Adobe Acrobat PDF here,   http://www.tigernews.co.uk/blog-twickers/dddscot/commercialsoftwaredev.pdf ... and if PowerPoint presentations don't do it for you, also thanks to Craig Murphy, you can watch a video of the presentation that I gave at DDD8 in Microsoft TVP, Reading,  http://vimeo.com/9216563

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  • SQL Server - MVP 2010

    - by JustinL
    I was very happy to receive an email last week to confirm I would receive the MVP Award for SQL Server for 2010 - very exciting news ! I missed the first FedEx delivery, however this weekend they were able to successfully deliver the package from Microsoft and it began to feel very real as I opened the box to find the MVP glass-ware! Since leaving Microsoft, the past couple of years have been incredibly challenging, exciting and satisfying.  The MVP Award is really special, the SQL community has a fantastic, international base with many successful events, leaders and contributors providing an impressive network both online and in-person. I'm really excited about the year ahead - starting this week with SQL Bits in London, followed by PASS EMEA in Germany next week and at the London PASS user group meeting on Monday 26th April. Regards,   Justin Langford - Coeo Ltd

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  • ASP.NET MVC Tabular Display Template

    The ASP.NET MVC2 templates feature is a pretty nice way to quickly scaffold objects at runtime. Be sure to read Brad Wilsons fantastic series on this topic starting at ASP.NET MVC 2 Templates, Part 1: Introduction. As great as this feature is, there is one template thats conspicuously missing. ASP.NET MVC does not include a template for displaying a list of objects in a tabular format. Earlier today, ScottGu forwarded an email from Daniel Manes (what?! no blog! ;) with a question on how to accomplish...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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  • We’re having an exceptionally good party – and you’re invited!

    - by Rebecca Amos
    Are you coming to the PASS Summit? Then join us to help Jeff Moden celebrate his Award of Exceptional DBA of the Year. Join us and SQLServerCentral for the Exceptional DBA Awards party on 11 October. We’ve booked a casino and bar, and will be giving away lots of great prizes throughout the night. It’s always a fun evening, and a fantastic chance to catch up with old friends – and meet new ones – before the conference kicks off. When: Tuesday 11 October, 8-10pm (after the Welcome Reception) Where: Room 2AB, Washington State Convention Center Tickets: $20 in advance ($30 on the door) Have a look at the current list of people coming – and come and join us! Get your ticket now.

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  • ASP.NET 4 Unleashed in Bookstores!

    - by Stephen Walther
    I’m happy to announce that ASP.NET 4 Unleashed is now in bookstores! The book is over 1,800 pages and it is packed with code samples and tutorials on all the features of ASP.NET 4. Given the size of the book – did I mention that it is over 1,800 pages? -- I can safely say that it is the most comprehensive book on ASP.NET  This edition of the book has several new chapters written by Kevin Hoffman and Nate Dudek. Kevin and Nate did a fantastic job of covering the new features of ASP.NET 4 including: The new ASP.NET Chart Control The new ASP.NET QueryExtender Control The new ASP.NET routing framework jQuery You can buy the book from your local bookstore or buy the book from Amazon:

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  • Chris Brook-Carter at the Oracle Retail Week Awards VIP Reception

    - by user801960
    The Oracle VIP Reception at the Oracle Retail Week Awards last week saw retail luminaries from around the UK and Europe gather to have a drink and celebrate the successes of retail in the last year. Guests included Lord Harris of Peckham, Tesco's Philip Clarke, Vanessa Gold from Ann Summers, former Retail Week editor Tim Danaher, Richard Pennycook from Morrisons and Ian Cheshire from Kingfisher Group. The new Retail Week editor-in-chief, Chris Brook-Carter, attended and took the time to speak to the guests about the value of the Oracle Retail Week Awards to the industry and to thank Oracle for its dedication to supporting the industry. Chris said: "I'd like to say a real heartfelt thanks to our partner this evening: Oracle. I had the privilege of being at the judging day and I got to meet Sarah and the team and I was struck by not only the passion that they have for the whole awards system and everything that means in terms of rewarding excellence within the retail industry but also their commitment to retail in general, and it's that sort of relationship that marks out retail as such a fantastic sector to be involved in." Chris's speech can be watched in full below:

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  • The Winds of Change are a Blowin&rsquo;

    - by Ajarn Mark Caldwell
    For six years I have been an avid and outspoken fan and paying customer of SourceGear products…from Vault to Dragnet to Fortress and on to Vault Professional, but that is all changing now.  Not the fan part, but the paying customer part.  I’m still a huge fan.  I think that SourceGear does a great job with their product and support has been fantastic when needed (which is not very often).  I think that Eric Sink has done a fine job building a quality company and products, and I appreciate his contributions to the tech community through this blogging and books.  I still think their products are high quality and do a fantastic job of what they do.  But there’s the rub…what they do is no longer enough for me. As I have rebuilt our development team over the last couple of years, and we have begun to investigate Scrum and Kanban, I realize that I need more visibility into the progress of the team.  I need better project management tools, and this is where Vault Professional lags behind several other tools.  Granted, in the latest release (Vault 6.0) they added a nice time tracking feature, but I want more.  (Note, I did contact SourceGear about my quest for more, but apparently, the rest of their customer base has not been clamoring for this and so they have not built it.  Granted, I wasn’t clamoring for it either until just recently, but unfortunately for SourceGear, I want it now and don’t want to wait for them to build it into their system.) Ironically, it was SourceGear themselves who started to turn me on to the possibilities of other tools.  They built a limited integration with Axosoft OnTime which I read about several times on their support site (I used to regularly read and occasionally comment on their Support Forum).  I decided to check out OnTime and was very impressed with the tool for work item tracking and project management (not to mention their great Scrum Master in 10 Minutes video).  I fell in love with the capabilities of OnTime.  Unfortunately, the integration with Vault for source control management was, as I mentioned, limited.  I could have forfeited the integration between work items and source code, but there is too much benefit to linking check-ins to work items for me to give that up.  So then I did what was previously unthinkable for me, I considered switching not just the work tracking tool, but also the source code management tool.  This was really stepping outside my comfort zone because source code is Gold, and not to be trifled with.  When you find a good weapon to protect your gold, stick with it. I looked at Git and Tortoise SVN, but the integration methods for those was pretty rough compared to what I was used to.  The recommended tool from Axosoft’s point of view appeared to be RocketSVN, but I really wasn’t sure I wanted to go the “flavor of Subversion” route.  Then I started thinking about that other tool I liked back when I first chose to go with Vault, but couldn’t afford:  Team Foundation Server.  And what do you know…Microsoft has not only radically improved it over that version from back in 2006, but they also came to their senses about how it should be licensed, and it is much more affordable now.  So I started looking into the latest capabilities in the 2012 version, and I fell in love all over again. I really went deep on checking out the tools.  I watched numerous webcasts from Microsoft partners, went to a beta preview on Microsoft’s campus, and watched a lot of Channel 9 videos on the new ALM features (oooh…shiny).  Frankly, I was very impressed with the capabilities of the newest version, and figured this was probably our direction.  As an interesting twist of fate, one of my employees crossed paths with an ALM Consultant from Northwest Cadence, a local Microsoft Partner, and one of the companies that produced several of the webcasts that I had been watching.  So I gave Bryon a call and started grilling him to see if he really knew anything or was just another guy who couldn’t find a job so he called himself a consultant.  It turns out Bryon actually knows a lot, especially in an area that was becoming a frustration point for us: Branching strategies and automated builds (that’s probably a whole separate blog entry).  As we talked, Bryon suggested we look into doing a DTDPS (Developer Tools Deployment Planning Services) session with his company.  This is a service that can be paid for by Microsoft Enterprise Agreement planning services credits or SA training benefits, and, again, coincidentally, we had several that were just about to expire, so I put them to good use. The DTDPS sessions were great; and Bryon, Rick, and the rest of the folks at Northwest Cadence have been a pleasure to work with.  We have just purchased a new server for our TFS rollout and are planning the steps and options right now.  This is still a big project ahead of us to not only install and configure TFS, but also to load all of our source code (many different systems, not just one program) and transition to the new way of life with TFS, but I am convinced that it is the right move for my team at this point in time.  We need the new capabilities that are in alignment with Scrum and Kanban methodologies in order to more efficiently manage all the different projects that we have going on at one time. I would still wholeheartedly endorse SourceGear’s products and Axosoft’s OnTime for those whose needs are met by those tools, but for me and my team, I think that TFS is the right fit, and I am looking forward to the change.

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  • SQLBits - Unicode Porn

    - by Most Valuable Yak (Rob Volk)
    We've just finished up a fantastic event at SQLBits X in London!  If you've never been to SQLBits and you can make it to the UK, I highly recommend it.  If you didn't attend, here's what you missed. Meanwhile, for those who attended the Lightning Talk sessions and were disappointed that I ran out of time, here's the last part that you would have seen: /*    How to Lose Friends and Irritate People...With Unicode!     Rob Volk     SQLBits X - London - March 31, 2012 */ -- some sexy SQL DECLARE @oohbaby TABLE(i INT NOT NULL UNIQUE, uni_char AS NCHAR(i), hex AS CAST(i AS BINARY(2))) INSERT @oohbaby VALUES(664),(1022),(1023),(1120),(1150),(8857),(11609),(42420),(42427) -- change results font to larger size, some only work in grid font SELECT * FROM @oohbaby SELECT NCHAR(1022) + NCHAR(1023) AS Page3Girl It's probably better that you run this yourself, in the privacy of your own home/office, you know *wink* *wink* *nudge* *nudge* *say no more*

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  • T-SQL Tuesday #005: Reporting

    - by Adam Machanic
    This month's T-SQL Tuesday is hosted by Aaron Nelson of SQLVariations . Aaron has picked a really fantastic topic: Reporting . Reporting is a lot more than just SSRS. Whether or not you realize it, you deal with all sorts of reports every day. Server up-time reports. Application activity reports. And even DMVs, which as Aaron points out are simply reports about what's going on inside of SQL Server. This month's topic can be twisted any number of ways, so have fun and be creative! I'm really looking...(read more)

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  • SQL SERVER – The Story of a Lesser Known Startup Parameter in SQL Server – Guest Post by Balmukund Lakhani

    - by Pinal Dave
    This is a fantastic blog post from my dear friend Balmukund ( blog | twitter | facebook ). He had presented a fantastic session in our last UG and there were lots of requests from attendees that he blogs about it. Well, here is the blog post about the same very popular UG session. Let us read the entire blog post in the voice of the Balmukund himself. During my last session in SQL Bangalore User Group (Facebook) meeting, I was lucky enough to deliver a session on SQL Server Startup issue. The name of the session was “SQL Engine Starting Trouble – How to start?” From the feedback, I realized that one of the “not well known” startup parameter is “-m”. Okay, you might say “I know that this is used to start the SQL in single user mode”. But what you might not know is that you can pass a string with -m which has special meaning and use. I have used this parameter in my blog here but looks like not many of you have seen that. It happens most of the time when we want to start SQL Server in single user mode, someone else makes connection before you can. The only choice you have is to repeat same process again till you succeed. Some smart DBAs may disable the remote network protocols (TCP/IP and Named Pipes) of SQL Instance and allow only local connections to SQL. Once the activity is complete, our dear smart DBA has to remember to re-enable network protocols. Sometimes, it may be a local service or application getting connection to SQL before we can. There is a better way to deal with it. Yes, you have guessed it correctly: -m parameter which a string. Since I work with SQL Product Support team, I may know little more undocumented commands and parameters, but this is not an undocumented stuff. It’s already documented in books online. So in this blog, I am going to show a demo of its usage. As documentation shows, “Do not use this option as a security feature.” So please read this blog as knowledge enhancer and troubleshooting issues not security feature. In my laptop, I have a default instance of SQL Server 2012 and here is what we would in the configuration manager. Now, I would go ahead and stop SQL Service by selecting SQL Server (MSSQLServer) > Right Click > Stop. There are multiple ways to start SQL with startup parameter. 1) Use Net Start Command from command prompt Net Start MSSQLServer /mSQLCMD The above command is the simplest way to add startup parameter to SQL. This parameter would be cleared once we stop and start SQL. 2) Add Startup Parameter via configuration manager. Step is already listed here. We need to add -mSQLCMD If we compare 1 and 2, it’s clear that unless we modify startup parameter and remove -m, it would be in effect. 3) Start SQL Service via command line SQLServr.exe –mSQLCMD –s<InstanceName> Wait, what does SQLCMD mean with /m? It’s the instruction to SQL that start SQL Server in Single User Mode and allow only the application which is SQLCMD. Any other application would fail with Login Failed for User Error message. It would be important to note that string is case sensitive. This value should be picked up from application_name column from sys.dm_exec_sessions. I have made a connection using SQLCMD and as we can see it comes as upper case “SQLCMD”. If we want only management studio query windows to connect then we need to give -m” Microsoft SQL Server Management Studio – Query” as startup parameter. In below example, I have given it as SQLCMd (lower case d at the end) and we would notice that we would not be able to connect to SQL Instance. Above proves that parameter works as expected and it’s case sensitive. Error Log would show below information. How to get error log location? I have already blogged about it. Hope you have learned something new. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology

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  • Toughest Developer Puzzle Ever

    - by Josh Holmes
    For the second year in a row, my friend and colleague Jeff Blankenburg has created what is quickly proving to live up to it’s namesake – the Toughest Developer Puzzle Ever. Some of the puzzles are technical, some are not but all require that you understand the web, development and technology to solve. Even if you don’t get in on the fantastic prizes that Jeff has lined up, there’s great bragging rights in being able to solve the Toughest Developer Puzzle Ever. This year, I was honored enough to get to create three of the puzzles myself – let me know what you think of them. I’m not going to tell you which ones I created now and definitely don’t ask me for hints – Jeff has threatened me if I give any of the puzzle away… ;) All I can say now is “Good luck!”

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  • Google I/O 2012 - HTML5 and App Engine: The Epic Tag Team Take on Modern Web Apps at Scale

    Google I/O 2012 - HTML5 and App Engine: The Epic Tag Team Take on Modern Web Apps at Scale Brad Abrams, Ido Green This talk discusses the latest and greatest application patterns and toolset for building cutting edge HTML5 applications that are backed by App Engine. This makes it incredibly easy to write an app that spans client and server; in particular, authentication just works out of the box. This talk walks through building a fantastic cloud-based HTML5 application For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 20 0 ratings Time: 59:50 More in Science & Technology

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