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  • how to follow python polymorphism standards with math functions

    - by krishnab
    So I am reading up on python in Mark Lutz's wonderful LEARNING PYTHON book. Mark makes a big deal about how part of the python development philosophy is polymorphism and that functions and code should rely on polymorphism and not do much type checking. However, I do a lot of math type programming and so the idea of polymorphism does not really seem to apply--I don't want to try and run a regression on a string or something. So I was wondering if there is something I am missing here. What are the applications of polymorphism when I am writing functions for math--or is type checking philosophically okay in this case.

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  • If a library doesn't provide all my needs, how should I proceed?

    - by 9a3eedi
    I'm developing an application involving math and physics models, and I'd like to use a Math library for things like Matrices. I'm using C#, and so I was looking for some libraries and found Math.NET. I'm under the impression, from past experience, that for math, using a robust and industry-approved third party library is much better than writing your own code. It seems good for many purposes, but it does not provide support for Quaternions, which I need to use as a type. Also, I need some functions in Vector and Matrix that also aren't provided, such as rotation matrices and vector rotation functions, and calculating cross products. At the same time, it provides a lot of functions/classes that I simply do not need, which might mean a lot of unnecessary bloat and complexity. At this rate, should I even bother using the library? Should I write my own math library? Or is it a better idea to stick to the third party library and somehow wrap around it? Perhaps I should make a subclass of the Matrix and Vector type of the library? But isn't that considered bad style? I've also tried looking for other libraries but unfortunately I couldn't find anything suitable.

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  • What are atan and atan2 used for in games?

    - by kyrogue
    I am having some trouble understanding Math.tan() and Math.atan() and Math.atan2(). I have basic knowledge of trigonmetry but the usage of SIN, COS, and TAN etc for game development is very new to me. I am reading on some tutorials and I see that by using tangent we can get the angle in which one object needs to be rotated by how much to face another object for example my mouse. So why do we still need to use atan or atan2?

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  • How to make a queue switches from FIFO mode to priority mode?

    - by enzom83
    I would like to implement a queue capable of operating both in the FIFO mode and in the priority mode. This is a message queue, and the priority is first of all based on the message type: for example, if the messages of A type have higher priority than the messages of the B type, as a consequence all messages of A type are dequeued first, and finally the messages of B type are dequeued. Priority mode: my idea consists of using multiple queues, one for each type of message; in this way, I can manage a priority based on the message type: just take first the messages from the queue at a higher priority and progressively from lower priority queues. FIFO mode: how to handle FIFO mode using multiple queues? In other words, the user does not see multiple queues, but it uses the queue as if it were a single queue, so that the messages leave the queue in the order they arrive when the priority mode is disabled. In order to achieve this second goal I have thought to use a further queue to manage the order of arrival of the types of messages: let me explain better with the following code snippet. int NUMBER_OF_MESSAGE_TYPES = 4; int CAPACITY = 50; Queue[] internalQueues = new Queue[NUMBER_OF_MESSAGE_TYPES]; Queue<int> queueIndexes = new Queue<int>(CAPACITY); void Enqueue(object message) { int index = ... // the destination queue (ie its index) is chosen according to the type of message. internalQueues[index].Enqueue(message); queueIndexes.Enqueue(index); } object Dequeue() { if (fifo_mode_enabled) { // What is the next type that has been enqueued? int index = queueIndexes.Dequeue(); return internalQueues[index].Dequeue(); } if (priority_mode_enabled) { for(int i=0; i < NUMBER_OF_MESSAGE_TYPES; i++) { int currentQueueIndex = i; if (!internalQueues[currentQueueIndex].IsEmpty()) { object result = internalQueues[currentQueueIndex].Dequeue(); // The following statement is fundamental to a subsequent switching // from priority mode to FIFO mode: the messages that have not been // dequeued (since they had lower priority) remain in the order in // which they were queued. queueIndexes.RemoveFirstOccurrence(currentQueueIndex); return result; } } } } What do you think about this idea? Are there better or more simple implementations?

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  • How can I get org-mode in stickies?

    - by Mike Dotterer
    I'm an emacs user on OSX (with Aquamacs) and I also like to use Stickies.app. What I would really like is a way to use org-mode functionality inside of stickies, but I would settle for a sticky-like window. What I want: Org-mode keybindings and functionality Separate window/frame with minimum chrome The ability to make the window "Float" on top of other windows.

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  • Check if in Integrated Pipeline Mode

    - by xaw
    Is it possible to check if our code is executing in Integrated Pipeline Mode or not? There are some ASP.NET class properties that only work in Integrated Pipeline Mode, and I want to avoid raising an exception if there is a way to test if our code is executing in that environment or not.

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  • How can I fall in love with Math? Again?

    - by gotts
    After reading How to not sort by average rating by Evan Miller I was really inspired to learn some more math. But after thinking about it for a while I didn't find a way I can use beyond-trivial math in my pet projects.. Or probably it is a moment like "You are not aware that you are not aware" and I should learn more math before I can start to see great examples of how I can apply it?

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  • Have any software engineers gotten math degrees later in their careers?

    - by vin
    I have a bachelors in computer science and worked the last 12 years as a software engineer. I'm bored with doing general development work, so I want to specialize. I'm thinking about getting a master's degree in math so I can build math models and write algorithms to implement them. I'm unsure what type of work I'd do (financial, gaming, graphics, science, research, etc) but I'm open minded. I would need to refresh my undergrad math skills (which are old and faded), but I loved algebra and calculus. I've been working with couple statisticians so I've been finding myself more interested in statistics. Since I'm a parent supporting a household, I would have to continue working while studying. Have any software engineers taken this route? (Specifically, going from BS in comp sci to MS in math.) If so, what advice do you have for coursework, financing, and getting a job that combines programming with advanced math? How abundant are these kinds of jobs? I'm not sure where one starts. Also, how do you hop from a BS to an MS in a different subject?

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  • IIS7 Itegrated Pipeline Mode: Context.User is intermittently null for Windows Auth

    - by AndyV
    Our code relies on checking the Context.User.Identity value in the Global.asax Application_AuthenticateRequest(...) method to retrieve some information about the logged in user. This works fine in classic mode but when I flip IIS to use the Integrated Pipeline "Context.User" comes back as null, but only intermittently. Any ideas why? I have < authentication mode="Windows" and only Windows Auth enabled in the Virtual Directory.

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  • How to interpret situations where Math.Acos() reports invalid input?

    - by Sean Ochoa
    Hey all. I'm computing the angle between two vectors, and sometimes Math.Acos() returns NaN when it's input is out of bounds (-1 input && input 1) for a cosine. What does that mean, exactly? Would someone be able to explain what's happening? Any help is appreciated! Here's me method: public double AngleBetween(vector b) { var dotProd = this.Dot(b); var lenProd = this.Len*b.Len; var divOperation = dotProd/lenProd; // http://msdn.microsoft.com/en-us/library/system.math.acos.aspx return Math.Acos(divOperation) * (180.0 / Math.PI); }

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  • How To Boot Your Android Phone or Tablet Into Safe Mode

    - by Chris Hoffman
    On your Windows PC, you can boot into safe mode to load Windows without any third-party software. You can do the same on Android with Android’s safe mode. In safe mode, Android won’t load any third-party applications. This allows you to troubleshoot your device – if you’re experiencing crashes, freezes, or battery life issues, you can boot into safe mode and see if the issues still happen there. From safe mode, you can uninstall misbehaving third-party apps. HTG Explains: Does Your Android Phone Need an Antivirus? How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder?

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  • How to design a separated tutorial mode?

    - by Sylpheed
    I'm working on a "social" game that's about 90% completion. One of the remaining features is the tutorial mode. Basically, the tutorial mode will restrict the user to access some parts of UI and limit the features (like store items). The tutorial will only progress if a certain event is triggered, specifically following the tutorial. The code is ready and we already have an "almost" working game. The problem is I haven't foreseen the tutorial mode while I was doing those 90%. My requirement is there shouldn't be any loading/transition from tutorial mode to normal mode. This means I have to pick up the progress from the tutorial (no re-rendering of assets and stuff). How should I design this in a way where I won't touch anything from my old code? I want it to be as easy as just plugging it in. I don't want to jam the tutorial in my old code since this will lead to many bugs.

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  • Switching from Debug into Release Mode with VS2010 as IDE and Intel C++ Compiler 13

    - by Drazick
    I have a code of a Plug In from an SDK. The code is in Debug Mode. I use Intel Compiler which only applies optimizations in Release Mode. Under configuration manager of the project only "Debug" mode is defined. How could I switch to "Release" mode and enable all Intel Compiler's optimizations? If I enable them on debug mode nothing is applied (Empty Report). I couldn't find the trick to do so. Thank You.

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  • The HTML5 doctype is not triggering standards mode in IE8

    - by El Guapo
    i work for a company where all our sites currently use the XHTML 1.0 transitional doctype (yes i know it is very old school). I want to change them all to use the HTML5 doctype seeing as it is backwards compatible. One of the reasons why i want to make the switch is because in IE8 if someone has the developer tools installed then the old XHTML doctype switches the browser into compatibility mode and renders the page as IE7. From reading up on it i was led to believe that the HTML5 doctype will set any page to render in standards mode, but this is not happening when i test it on our staging server it still flips into IE7 rendering mode. The weird thing is if i save the page with HTML5 doctype locally and open it, it is rendering in IE8 standards mode. There must be something else causing it to drop into compatibility IE7 rendering. Any ideas what this could be? Below is the head of the test page i have been looking at: <!DOCTYPE html > <html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml"> <head> <title>Burton - Mens Clothing - Mens Fashion - Burton Menswear</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="description" content="Burton is one of the UK's leading men's clothing &amp; fashion retailers, with a range of men's clothing designed to make you look &amp; feel good. Find formal &amp; casual clothes &amp; accessories for men online at Burton menswear"/> <meta name="keywords" content="menswear, clothes for men, clothing for men, men clothes, men's fashion, men's wear, men's clothing online, men's clothes online, men's clothes shop, burton men's, burton menswear, burton uk, burton"/> <script type="text/javascript">document.getElementsByTagName('html')[0].className = 'js';</script> <link rel="stylesheet" type="text/css" href="http://eu.burton-menswear.com/wcsstore/ConsumerDirectStorefrontAssetStore/images/colors/color2/v3/css/screen.css" /> <link rel="stylesheet" type="text/css" href="http://eu.burton-menswear.com/wcsstore/ConsumerDirectStorefrontAssetStore/images/colors/color2/v3/css/print.css" media="print"/> <link rel="stylesheet" type="text/css" href="http://eu.burton-menswear.com/wcsstore/ConsumerDirectStorefrontAssetStore/images/colors/color2/v3/css/brand.css" /> <!--[if lt IE 8]> <link rel="stylesheet" href="http://eu.burton-menswear.com/wcsstore/ConsumerDirectStorefrontAssetStore/images/colors/color2/v3/css/ie.css" type="text/css" media="screen, projection"> <![endif]--> <meta http-equiv="content-language" content="en-gb" /> <link rel="shortcut icon" type="image/x-icon" href="http://eu.burton-menswear.com/favicon.ico" /> <link rel="search" type="application/opensearchdescription+xml" title="burton.co.uk Search" href="http://eu.burton-menswear.com/burton-search.xml"/> <!-- Start Summit Tag --> <script type="text/javascript"> var __stormJs = "t1.stormiq.com/dcv4/jslib/3286_D92B7532_4A18_46A8_864A_5FDF1DF25844.js"; </script> <script type="text/javascript" src="http://eu.burton-menswear.com/javascript/track.js"></script> <!-- End Summit Tag --> <!-- Start QuBit Tag --> <script src=//d3c3cq33003psk.cloudfront.net/opentag-31935-42109.js async defer></script> <!-- End QuBit Tag --> <link type="text/css" rel="stylesheet" href="http://reviews.br.wcstage.arcadiagroup.ltd.uk/bvstaging/static/6028-en_gb/bazaarvoice.css" ></link> </head>

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  • MediaWiki Math Extension Out of Sync

    - by kfmfe04
    I am trying to run MediaWiki 1.19.2 on Ubuntu Linux (3.0.0-26-generic #42-Ubuntu AMD 64). It installs fine via tar.gz, however, I run into problems when trying to install the Math extension (via git clone from its repository). I get the following error in the Apache logs: PHP Fatal error: Call to undefined method FSFileBackend::getRootStoragePath() in /var/www/abc.com/html/mediawiki-1.19.2/extensions/Math/Math.body.php on line 361, referer: http://intra.abc.com/wiki/index.php?title=Quality&action=submit so apparently, the latest Math extension is out-of-sync with MediaWiki 1.19.2; the latest Math extension is apparently using post-1.19.2 methods. I tried looking through the git logs for some indication (a tag, perhaps?) of which revision of Math worked with 1.19.2, but no luck. Anyone have any suggestions? Thanks in advance. Edit: Just my luck - after posting this message, I found this link. I think this version should do the job. Consider this question closed/answered.

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  • Modular Reduction of Polynomials in NTRUEncrypt

    - by Neville
    Hello everyone. I'm implementing the NTRUEncrypt algorithm, according to an NTRU tutorial, a polynomial f has an inverse g such that f*g=1 mod x, basically the polynomial multiplied by its inverse reduced modulo x gives 1. I get the concept but in an example they provide, a polynomial f = -1 + X + X^2 - X4 + X6 + X9 - X10 which we will represent as the array [-1,1,1,0,-1,0,1,0,0,1,-1] has an inverse g of [1,2,0,2,2,1,0,2,1,2,0], so that when we multiply them and reduce the result modulo 3 we get 1, however when I use the NTRU algorithm for multiplying and reducing them I get -2. Here is my algorithm for multiplying them written in Java: public static int[] PolMulFun(int a[],int b[],int c[],int N,int M) { for(int k=N-1;k>=0;k--) { c[k]=0; int j=k+1; for(int i=N-1;i>=0;i--) { if(j==N) { j=0; } if(a[i]!=0 && b[j]!=0) { c[k]=(c[k]+(a[i]*b[j]))%M; } j=j+1; } } return c; } It basicall taken in polynomial a and multiplies it b, resturns teh result in c, N specifies the degree of the polynomials+1, in teh example above N=11; and M is the reuction modulo, in teh exampel above 3. Why am I getting -2 and not 1?

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  • Good Package for Fitting Polynomial Trend Lines

    - by Rev316
    Given a simple data set, I would like to be able to calculate a trending formula given it's a second order polynomial regression. In fact, it would be great if one could even forecast X periods during calculation (similar to what Excel does). I'm looking for a portable C/C++ package that's relatively easy to use, and allows it to spit out the "best-fit" (highest R^2 value) curve. Any suggestions? Thanks!

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  • Possible to create a shortcut in Windows 7 to a mounted network drive in XP Mode?

    - by Greg R.
    I'm using an application that mounts a remotely hosted directory as a drive in Windows. Unfortunately, it doesn't run under 64-bit Windows 7. Using Windows 7's "XP Mode," though, the app works just fine in this virtualized 32-bit environment. The mounted drive displays and is accessible in XP Mode's virtualized XP environment. However, what I would really like is to open the mounted network drive in XP Mode directly from Windows 7 (even if I can't drag and drop). XP Mode allows you to launch applications installed in the virtualized XP environment from shortcuts in Windows 7. However, I can't find a way to launch Windows Explorer or specific mapped drives on the virtualized XP environment from shortcuts in Windows 7. Can anyone provide instructions to create a shortcut in Windows 7 to a network drive mapped in the virtualized XP environment of XP Mode?

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  • Why does Windows 7 need hardware virtualization to run XP mode?

    - by Ken Pespisa
    I have a MacBook Pro and I've run VMware Fusion's unity mode and Parallels' cohesion mode along side the Mac OS X, and both work pretty seamlessly. I figured XP Mode in Windows 7 would be something similar, but I then learned my machine requires hardware virtualization support, which it does not have. My machine is an HP dc7800. That's a dual core 2.2GHz machine with 4GBs of RAM. Certainly it has the horsepower to run a virtual environment alongside the primary OS. I'm wondering: 1) Why Microsoft decided to make hardware virtualization a requirement and 2) What am I missing? Is the experience similar to Parallel's cohesion mode / Fusion's unity mode? Thanks!

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  • iphone Memory gets freed in debug mode but not in release mode

    - by gdr
    I have been testing my iPhone debug build on both my device and simulator with activity monitor, leaks, and object allocations. The code is pretty well optimized so I have decided to test the release build. I went into the project Menu and set the target build to be release, I then added the necessary header paths that my app is using to the headers search paths and ran the release build on the device with the above mentioned instruments. What I have noticed now is that memory that was freed when I used the debug build does not get freed when using release version. There is one place in my App that I remove a scroll view with some images which frees up a significant amount of memory when I use the debug build, but no memory is freed up in that place when I use the release version. Does someone have any ideas where I need to start looking at? did I setup my release build wrong?

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