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  • Extreme Optimization –Mathematical Constants and Basic Functions

    - by JoshReuben
    Machine constants The MachineConstants class - contains constants for floating-point arithmetic because the CLS System.Single and Double floating-point types do not follow the standard conventions and are useless. machine constants for the Double type: machine precision: Epsilon , SqrtEpsilon CubeRootEpsilon largest possible value: MaxDouble , SqrtMaxDouble, LogMaxDouble smallest Double-precision floating point number that is greater than zero: MinDouble , SqrtMinDouble , LogMinDouble A similar set of constants is available for the Single Datatype  Mathematical Constants The Constants class contains static fields for many mathematical constants and common expressions involving small integers – if you are doing thousands of iterations, you wouldn't want to calculate OneOverSqrtTwoPi , Sqrt17 or Log17 !!! Fundamental constants E - The base for the natural logarithm, e (2.718...). EulersConstant - (0.577...). GoldenRatio - (1.618...). Pi - the ratio between the circumference and the diameter of a circle (3.1415...). Expressions involving fundamental constants: TwoPi, PiOverTwo, PiOverFour, LogTwoPi, PiSquared, SqrPi, SqrtTwoPi, OneOverSqrtPi, OneOverSqrtTwoPi Square roots of small integers: Sqrt2, Sqrt3, Sqrt5, Sqrt7, Sqrt17 Logarithms of small integers: Log2, Log3, Log10, Log17, InvLog10  Elementary Functions The IterativeAlgorithm<T> class in the Extreme.Mathematics namespace defines many elementary functions that are missing from System.Math. Hyperbolic Trig Functions: Cosh, Coth, Csch, Sinh, Sech, Tanh Inverse Hyperbolic Trig Functions: Acosh, Acoth, Acsch, Asinh, Asech, Atanh Exponential, Logarithmic and Miscellaneous Functions: ExpMinus1 - The exponential function minus one, ex-1. Hypot - The hypotenuse of a right-angled triangle with specified sides. LambertW - Lambert's W function, the (real) solution W of x=WeW. Log1PlusX - The natural logarithm of 1+x. Pow - A number raised to an integer power.

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  • Cannot Create a connection to Data Source VB 2010 [closed]

    - by CLO_471
    I seem to be having some issues with my Visual Basic 2010. I am trying to create a connection to a data source and it is just not working. Even my old connections in my other projects are not working. When I get into VB I try and create a connection by clicking Add New Data Source Database DataSet New Connection and when I click on New Connection the screen disappears and I am not able to select anything. Does anyone know of a glitch or something? I have checked my ODBC connections and all is good and I have been able to play around with my Access connections (which I am trying to connect) and Queries and everything seems to be working fine. I have rebooted several times, uninstalled and resinstalled VB and have also repaired the entire application. I am not sure what else to try or what else to do. Any help would be much appreciated. My computer specs are XP SP3, Core2 Duo at 2.80 and 3GB RAM

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  • Using Apache2 to set up a basic webpage

    - by mrhatter
    I am having a problem with a test page I set up for my website. The config file (index.html) looks like this <html> <head> <title>Welcome to website.net!</title> </head> <body> <h1>Success! The website.net virtual host is working!</h1> </body> </html> Which should display a page like this in my browser when I navigate to www.mywebsite.net Welcome to website.net! Success! The website.net virtual host is working! However I get a 403 "forbidden" error when I navigate to the page. What am I missing? I have the directory installed on /var/www/mywebsite.net/public_html/index.html I have the permissions of the /var/www directory set to 755 so that others can read and exicute it but it does not seem to be working. I also have port 80 open on my iptable. The server is a VPS server if that makes a difference however I have added a DNS record for the ip address. Any help is appreciated! UPDATE: Here is my virtual host configuration file "mywebsite.net.conf" <VirtualHost *:80> # Admin email, Server Name (domain name), and any aliases ServerAdmin [email protected] ServerName www.mywebsite.net ServerAlias mywebsite.net # Index file and Document Root (where the public files are located) DirectoryIndex index.html index.php DocumentRoot /home/myusername/public/mywebsite.net/public # Log file locations LogLevel warn ErrorLog /home/mysuername/public/mywebsite.net/log/error.log CustomLog /home/myusername/public/mywebsite.net/log/access.log combined <Directory /home/myusername/public/mywebsite.net/public> Options Indexes ExecCGI Includes FollowSymLinks MultiViews AllowOverride All Order Deny,Allow Allow from all </Directory> </VirtualHost>

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  • Automate proftpd-basic install on ubuntu using apt-get

    - by Bryan
    I'm trying to build a shell script to automate the installation of several packages onto an Ubuntu 10.04 server, and I'm having problems with proftpd-basic. I'm using the command line apt-get -qy install proftpd-basic >/tmp/install.log For most packages, this approach would work fine, however proftpd-basic appears to require some interaction (it asks whether to perform an inetd or standalone installation). Is it possible for me to pre-select this option on the command line somehow, as I don't want the user to be bothered by this question? - For info, if it matters, I want to choose the 'standalone' option.

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  • Stairway to PowerPivot and DAX - Level 3: The DAX DISTINCT() Function and Basic Distinct Counts

    Bill Pearson, Business Intelligence architect and author, exposes the DAX DISTINCT() function, and then provides some hands-on exposure to its use in generating distinct counts. Moreover, he further explores working with measures in the PivotTable in this, the third Level of our new Stairway to PowerPivot and DAX series. Optimize SQL Server performance“With SQL Monitor, we can be proactive in our optimization process, instead of waiting until a customer reports a problem,” John Trumbul, Sr. Software Engineer. Optimize your servers with a free trial.

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  • Basic Connections Through Socket Server

    - by Walrus
    I'm designing a simple 2 player RTS with Stencyl, a program that uses blocks for coding. The current code updates lists whenever an actor moves (new X and Y), and I'd want the server to update the game state with each change to the list. However, to start off: I don't even know how to set up a socket server. Stencyl has taught me the basics of logic, but I've yet to learn any programming languages. I've downloaded a Smartfox 2X socket server that I'm intending to use. Right now I'm only looking to make baby steps; I want to do something to this effect: "When someone connects to the server, open insert file here". How can I do this? My intention is to have this file be the game client. Is this "open file when connected" method the best way to go about this? When answering: assume that I know nothing, because really, though I have done research (I know that UDPTCP for real time), implementation-wise I know nothing.

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  • Basic tutorial/introduction for 3d matrices, idealy in c++, without openGl or directX

    - by René Nyffenegger
    I am wondering if there is a simple tutorial that covers the basics of how to initialize rotation, translation and projection matrices, and how to multiply them, and how to get the screen coordinates afterwards for a 3d point. Idealy, the tutorial comes with compilable code and is not dependent on any 3rd party library. Searching the internet, I found lots of tutorials, so this is not the problem. Yet, it seemed all of these either covered openGl or directX, or they were theoretical in nature.

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  • GLM Velocity Vectors - Basic Maths to Simulate Steering

    - by Reanimation
    UPDATE - Code updated below but still need help adjusting my math. I have a cube rendered on the screen which represents a car (or similar). Using Projection/Model matrices and Glm I am able to move it back and fourth along the axes and rotate it left or right. I'm having trouble with the vector mathematics to make the cube move forwards no matter which direction it's current orientation is. (ie. if I would like, if it's rotated right 30degrees, when it's move forwards, it travels along the 30degree angle on a new axes). I hope I've explained that correctly. This is what I've managed to do so far in terms of using glm to move the cube: glm::vec3 vel; //velocity vector void renderMovingCube(){ glUseProgram(movingCubeShader.handle()); GLuint matrixLoc4MovingCube = glGetUniformLocation(movingCubeShader.handle(), "ProjectionMatrix"); glUniformMatrix4fv(matrixLoc4MovingCube, 1, GL_FALSE, &ProjectionMatrix[0][0]); glm::mat4 viewMatrixMovingCube; viewMatrixMovingCube = glm::lookAt(camOrigin, camLookingAt, camNormalXYZ); vel.x = cos(rotX); vel.y=sin(rotX); vel*=moveCube; //move cube ModelViewMatrix = glm::translate(viewMatrixMovingCube,globalPos*vel); //bring ground and cube to bottom of screen ModelViewMatrix = glm::translate(ModelViewMatrix, glm::vec3(0,-48,0)); ModelViewMatrix = glm::rotate(ModelViewMatrix, rotX, glm::vec3(0,1,0)); //manually turn glUniformMatrix4fv(glGetUniformLocation(movingCubeShader.handle(), "ModelViewMatrix"), 1, GL_FALSE, &ModelViewMatrix[0][0]); //pass matrix to shader movingCube.render(); //draw glUseProgram(0); } keyboard input: void keyboard() { char BACKWARD = keys['S']; char FORWARD = keys['W']; char ROT_LEFT = keys['A']; char ROT_RIGHT = keys['D']; if (FORWARD) //W - move forwards { globalPos += vel; //globalPos.z -= moveCube; BACKWARD = false; } if (BACKWARD)//S - move backwards { globalPos.z += moveCube; FORWARD = false; } if (ROT_LEFT)//A - turn left { rotX +=0.01f; ROT_LEFT = false; } if (ROT_RIGHT)//D - turn right { rotX -=0.01f; ROT_RIGHT = false; } Where am I going wrong with my vectors? I would like change the direction of the cube (which it does) but then move forwards in that direction.

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  • 5 Mac Applications For Web And Graphic Design

    - by Jyoti
    In this article free applications useful and effective for the development and creation of websites with your Mac computer. Without further ado, here are 5 Excellent Mac Application for Web and Graphic Design. Fotoflexer : Fotoflexer claims to be “The world’s most advanced online image editor”. It offers completely free access to numerous features such as photo effects, graphics, shapes, morphing, and the creation of collages. You can also integrate and share your art with social sites like MySpace, Flickr, Facebook, and more. This can be an important app if the site you are creating is going to use applications. Simple CSS : With Simple CSS you can create Cascading Style Sheets from scratch or edit them right from the comfort of your desktop. Update styles on multiple pages all at once and reduce the data transfer usage on your page for faster loads. Blender : Blender is an open source software that allows you to create 3D animation with interactive playback leaves you with the option to optimize the style of your site with a few graphics. You can create animations with shades of colors, glossy features, soft shadows and advanced rendering features. JAlbum : Jalbum is a very useful app that allows you to create stylish photo galleries to publish on the web. All you have to do is simply drag selected folders into a pane where any images contained within the folder will automatically be arranged into a photo gallery. You can add several different themes and templates to enhance the appearance of your gallery, later then gain the HTML code and publish the complete gallery onto the web. Colorate : With Colorate you can create harmonized color palettes along with color schemes. Generate these palettes for images, photographs and more.

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  • 2D basic map system

    - by Cyril
    i'm currently coding a 2D game in Java, and I would like to have some clues on how-to build this system : the screen is moving on a grander map, for instance, the screen represent 800*600 units on a 100K*100K map. When you command your unit to go to another position, the screen move on this map AND when you move your mouse on a side or another of the screen, you move the screen on the map. Not sure that i'm clear, but we can retrieve this system in most RTS games (warcraft/starcraft for example). I'm currently using Slick 2D. Any idea ? Thanks.

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  • Basic Defensive Database Programming Techniques

    We can all recognise good-quality database code: It doesn't break with every change in the server's configuration, or on upgrade. It isn't affected by concurrent usage, or high workload. In an extract from his forthcoming book, Alex explains just how to go about producing resilient TSQL code that works, and carries on working.

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  • Open World Session - BPM, SOA and ADF Combined:Patterns learned from Fusion Applications

    - by mesriniv
    Blog by Meera Srinivasan (Oracle Product Management) Today afternoon (10/2/2012), Mohan Kamath, and I (Meera Srinivasan) delivered an Open World session on how Oracle Fusion Applications (the next generation business applications from Oracle), use Oracle BPM, Oracle SOA and Oracle ADF products. These adoption patterns can be applied in a generic manner to produce process-centric, user-centric, highly customizable and extensible next generation application. The session was well attended and we had lively discussions with the attendees during Q & A. We started with why as an application developer, you should look at BPM for creating a process-centric application and presented the following fusion adoption patterns Model driven agile development Customization and Extension Guided Process Interactions Personalization and Customization of End User Interfaces Approval Flows Fusion HCM, On Boarding Process - Activity Guide Interface was used as an example for the Guided Process Interactions adoption pattern and the Fusion CRM BPM Process Templates for Customization adoption pattern. In the Personalization and Customization of End User Interfaces section, we looked at how ADF is used within Oracle BPM and the various options available to customize end user interfaces. We also presented how Oracle Procurement does complex approvals using Rules and Approval Management Extensions. We hope you found the session useful, and please do try to attend Heidi’s session on dynamic case management: Case Management Patterns with Oracle Unified Business Process Management Suite. Marriott Marquis - Salon 7, Thu 11:15 AM - 12:15 PM

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  • Basic Web Design Practices

    When the web designing concept was initially introduced, just having online website made a company unique from others and pushed it ahead of competition in the market. This is not the case anymore. A... [Author: Alan Smith - Web Design and Development - June 08, 2010]

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  • Microkernel architectural pattern and applicability for business applications

    - by Pangea
    We are in the business of building customizable web applications. We have the core team that provides what we call as the core platform (provides services like security, billing etc.) on top of which core products are built. These core products are industry specific solutions like telecom, utility etc. These core products are later used by other teams to build customer specific solutions in a particular industry. Until now we have a loose separation between platform and core product. The customer specific solutions are build by customizing 20-40% of the core offering and re-packaging. The core-platform and core products are released together as monolithic apps (ear). I am looking to improvise the current situation so that there is a cleaner separation on these 3. This allows us to have evolve each of these 3 separately etc. I've read through the Mircokernel architecture and kind of felt that I can take apply the principles in my context. But most of my reading about this pattern is always in the context of operating systems or application servers etc. I am wondering if there are any examples on how that pattern was used for architecting business applications. Or you could provide some insight on how to apply that pattern to my problem.

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  • Basic Defensive Database Programming Techniques

    We can all recognize good-quality database code: It doesn't break with every change in the server's configuration, or on upgrade. It isn't affected by concurrent usage, or high workload. In an extract from his forthcoming book, Alex explains just how to go about producing resilient TSQL code that works, and carries on working.

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  • PeopleSoft 8.52 iPad Certification

    - by Dave Bain
    One of the real gems in the PeopleTools 8.52 release is the certification of PeopleSoft applications running in the Safari Browser on an iPad.  It is nice that PeopleSoft is not constrained by technology like Adobe Flex/Flash, so announcements like this "Adobe drops plans for mobile Flash support" do not limit our mobile solution to custom mobile development. There are parts of PeopleSoft applications that operate better on iPads than others.  One of the best is Workcenters.  Workcenters were new to PeopleTools 8.51 and we are starting to see more and more adoption of them.  Workcenters are roll based landing pages that eliminate difficult navigation by providing access to most links, pages, and reports a user in a role needs.  One of the nicest I’ve seen is the Supply Manager Workspace.  Here are some links to screenshots of what a WorkCenter looks like on an iPad: Here's the standard PeopleSoft Login Page The Supply Manager Workspace looks great full screen on an iPad iPad has a great user interface to zoom, here's a screenshot of an upclose view of an analytic. Touch one of the analytics and it drills into the details. Go ahead and give it a try.  WorkCenters and Dashboards are starting to show up across applications.  For a quick one to try, navigate to the PeopleTools->Integration Broker->Integration Network WorkCenter.  It’s new in PeopleTools 8.52.

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  • 3 Basic SEO Tips For New Online Marketers

    It is prudent to start promoting a website using free SEO methods first. That way you gain knowledge and experience without the risk of losing any money should you make a few wrong moves. From then on, you can choose to wisely transition to paid methods if need be.

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  • Visual Studio 2010: Pro Power Tools

    - by Enrique Lima
    There is a set of Pro Power Tools released yesterday for Visual Studio 2010.  Check them out here. Brian Harry did a feature summary description on his blog.  Check it out here: http://blogs.msdn.com/b/bharry/archive/2010/06/07/announcing-the-first-visual-studio-pro-power-tools.aspx

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  • Visual Studio Extension: Web Essentials

    - by BizTalk Visionary
    To quote Scott Hanselman…. Visual Studio 2010 is really extensible and that's allowed many folks on the team to try out new features for Web Development without having to rebuild Visual Studio itself. One of those "playground" extensions is called "Web Essentials" by Mads Kristensen. Mads handles HTML5 and CSS3 tools for our team. You might remember Mads from when we released the Web Standards Update a few months back. Get it here: Scott Nanselman blog...

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  • A Look at Exceptions in .NET Applications

    Memory dumps are a wonderful way of finding out what caused an exception in a managed .NET application, particularly if it is happening in a production application. It is when tracking exceptions in applications where you can't use Visual Studio that the techniques of using cdb and sos.dll come into their own. They may nor be skills that you need to use regularly, but at some point, they will be invaluable. Edward supplies sample memory dumps and gives you a simple introduction.

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