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• Understanding OpenGL Matrices

  - by Omega

  I'm starting to learn about 3D rendering and I've been making good progress. I've picked up a lot regarding matrices and the general operations that can be performed on them. One thing I'm still not quite following is OpenGL's use of matrices. I see this (and things like it) quite a lot: x y z n ------- 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 So my best understanding, is that it is a normalized (no magnitude) 4 dimensional, column-major matrix. Also that this matrix in particular is called the "identity matrix". Some questions: What is the "nth" dimension? How and when are these applied? My biggest confusion arises from how OpenGL makes use of this kind of data.

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• How to write async background workers that work on WPF flowdocument

  - by iBe

  I'm trying to write a background worker that processes a flowdocument. I can't access the properties of flowdocument objects because of the thread verification. I tried to serialize the document and loaded it on the worker thread which actually solved the thread verfication issue. However, once the processing is complete I also need to use things like TextPointer objects. Those objects now point to a objects in the copy not the original. Can anyone suggest the best way to approach such background processing in WPF?

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• Saving data so it can be loaded locally

  - by Thomas Joos

  hi guys, i'm working on iphone application which needs to run offline at an exhibition. It should present data, stored local because there is no internet at the booth. Still, to easily have content updates it should be able to update it's content once connected to internet. It's quite some data ( around 300 full lines of text ) and I want it to be loaded, stored and visualized as optimized as possible. What's the best way to load in content once connected and how should I store it on the device?

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• In C#, can I hide/modify accessors in subclasses?

  - by Diego

  I'm not even sure what this principle is called or how to search for it, so I sincerely apologize if it has been brought up before, but the best way to do it is with an example. class Properties { public string Name { get; set; } } class MyClass { class SubProperties: Properties { public override Name { get { return GetActualName(); } set { _value = SetActualName(value); } } } public SubProperties ClassProperties; private GetActualName() { ClassProperties.Name = "name"; } private SetActualName(string s) { ClassProperties.Name = SomeOtherFunction(s); } } The idea is to have any object that instantiates MyClass have a fully accessible property ClassProperties. To that object, it would look exactly like a Properties object, but behind the scenes, MyClass is actually computing and modifying the results of the fields. This method of declaration is obviously wrong since I can't access GetActualName() and SetActualName() from within the SubProperties definition. How would I achieve something like this?

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• How to stop ReSharper from showing error on a lambda expression where Action is expected?

  - by carlmon

  In Silverlight, System.Windows.Threading's Dispatcher.BeginInvoke() takes an Action<T> or a delegate to invoke. .NET allows me to pass just the lambda expression. but ReSharper sees it as an error, saying "Cannot resolve method 'BeginInvoke(lambda expression)'": Dispatcher.BeginInvoke(() => { DoSomething(); }) The error goes away if I explicitly create the Action around the expression like this: Dispatcher.BeginInvoke(new Action<object>(o => { DoSomething(); })); I prefer the least amount of code in this case for the best readability. Is there a way to disable this specific ReSharper error notification? I tried some of the options, but could not find it. Thanks, Carl

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• How do views reduce code duplication?

  - by Debuger

  Hi! I read something like this about db views: Views are incredibly powerful and useful for one reason that stands out above all the other very good reasons. They reduce code duplication. That is, in most cases, the bottom line. If a query will be used in three or more places, then a view will drastically simplify your changes if the schema or query parameters change. I once had to edit 22 stored procedures to change some query logic. If the original architecture had utilized views, then I would have had only three changes. Can anyone explain to me how it works, and maybe give me some examples? Best regards!

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• If you're not supposed to use Regular Expressions to parse HTML, then how are HTML parsers written?

  - by Andy E

  I see questions every day asking how to parse or extract something from some HTML string and the first answer/comment is always "Don't use RegEx to parse HTML, lest you feel the wrath!" (that last part is sometimes omitted). This is rather confusing for me, I always thought that in general, the best way to parse any complicated string is to use a regular expression. So how does a HTML parser work? Doesn't it use regular expressions to parse. One particular argument for using a regular expression is that there's not always a parsing alternative (such as JavaScript, where DOMDocument isn't a universally available option). jQuery, for instance, seems to manage just fine using a regex to convert a HTML string to DOM nodes. Not sure whether or not to CW this, it's a genuine question that I want to be answered and not really intended to be a discussion thread.

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• Most efficient way to solve system of equations involving the digamma function?

  - by Neil G

  What is the most efficient way to solve system of equations involving the digamma function? I have a vector v and I want to solve for a vector w such that for all i: digamma(sum(w)) - digamma(w_i) = v_i and w_i 0 I found the gsl function gsl_sf_psi, which is the digamma function. Is there an identity I can use to reduce the equations? Is my best bet to use a solver? I am using C++0x; which solver is easiest to use and fast?

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• Cross platform unicode path handling

  - by Matt Joiner

  I'm using boost::filesystem for cross-platform path manipulation, but this breaks down when calls need to be made down into interfaces I don't control that won't accept UTF-8. For example when using the Windows API, I need to convert to UTF-16, and then call the wide-string version of whatever function I was about to call, and then convert any output back to UTF-8. While the wpath, and other w* forms of many of the boost::filesystem functions help keep sanity, are there any suggestions for how best to handle this conversion to wide-string forms where needed, while maintaining consistency in my own code?

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• Checking for Value in JS Object

  - by pagewil

  I have a JS Object like so: var ob{ 1 : { id:101, name:'john', email:'[email protected]' }, 2 : { id:102, name:'jim', email:'[email protected]' }, 3 : { id:103, name:'bob', email:'[email protected]' }, } I want to check if this JS object already contains a record. If it doesn't then I want to add it. For example. if(ob contains an id of 101){ //don't add john }else{ //add john } Catch my drift? Pretty simple question. I just want to know the best way of doing it. Thanks Guys! W.

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• Server Benchmarking: What tools to use with my real-world test data

  - by mdemmitt

  I want to benchmark a new server using historical HTTP-request data. I have a textfile that contains one day's worth of real historical requests to a production server. What is the best tool for sending that list of requests on the server I'm testing? The tool I use should be able to configure the following: Number of threads making the requests Number of requests/second sent A list of request URLs to use when making the requests. Apache Bench seems like a close fit. However, Bench does not seem to be able to take in a list of request URLs as a parameter. What would you recommend?

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• Ouput all the page's media queries in a list

  - by alecrust

  Using JavaScript, what would be the best way to output a list containing all media queries that are being applied to the current page. I assume this would need to filtering to find embedded media queries i.e. <link rel="stylesheet" media="only screen and (min-width: 30em)" href="/css/30em.css"> as well as media queries located in CSS files, i.e. @media only screen and (min-width: 320px) {} An example output of what I'm looking for: <p>There are 3 media queries loaded on this page</p> <ol> <li>30em</li> <li>40em</li> <li>960px</li> </ol>

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• Named semaphores in Python?

  - by Boaz

  Hi, I have a script in python which uses a resource which can not be used by more than a certain amount of concurrent scripts running. Classically, this would be solved by a named semaphores but I can not find those in the documentation of the multiprocessing module or threading . Am I missing something or are named semaphores not implemented / exposed by Python? and more importantly, if the answer is no, what is the best way to emulate one? Thanks, Boaz PS. For reasons which are not so relevant to this question, I can not aggregate the task to a continuously running process/daemon or work with spawned processed - both of which, it seems, would have worked with the python API.

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• Multiple key/value pairs in HTTP POST where key is the same name

  - by randombits

  I'm working on an API that accepts data from remote clients, some of which where the key in an HTTP POST almost functions as an array. In english what this means is say I have a resource on my server called "class". A class in this sense, is the type a student sits in and a teacher educates in. When the user submits an HTTP POST to create a new class for their application, a lot of the key value pairs look like: student_name: Bob Smith student_name: Jane Smith student_name: Chris Smith What's the best way to handle this on both the client side (let's say the client is cURL or ActiveResource, whatever..) and what's a decent way of handling this on the server-side if my server is a Ruby on Rails app? Need a way to allow for multiple keys with the same name and without any namespace clashing or loss of data.

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• Can you use the PackageMaker command to create an installer from a list of files?

  - by zekel

  I want to (periodically and automatically) create an installer from various files and folders that are in many places. But, I can't figure out how to supply the packagemaker command with all the paths of the items I want to install. This is for internal development purposes, not for customer distribution. I want the files included to be configureable; it's not really an option to use the GUI to add all the paths because they will change frequently. The best I could do was to use the --watch flag and touch all of the stuff I wanted included in the package. This is very messy and includes other files that happen to be accessed at the same time. There isn't a common scheme to what I want to include, so I can't just --filter the rest out. Is there a better way? Am I missing the point?

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• Android material L image transition interpolator

  - by Diolor

  This is more of a mathematics question rather than programming. Well, I would like to ask id you know what is the interpolator described in Material design: It looks to be an AccelerateDecelerateInterpolator but the deceleration effect decays slower. My best hatch is : public class MaterialInterpolator implements Interpolator { @Override public float getInterpolation(float input) { if(input<1./3f) return new AccelerateInterpolator().getInterpolation(input); else return new DecelerateInterpolator().getInterpolation(input); } } Which creates a gap between the values: Time / Value 0.3,0.09 0.317,0.100489 0.333,0.110889 <-- gap 0.35,0.57750005 0.367,0.599311 0.383,0.61931103 0.4,0.64 Source: http://www.google.com/design/spec/patterns/imagery-treatment.html

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• OAuth2 Flow for Mobile Devices

  - by Bart Jedrocha

  We're currently working on an API that will be consumed by a variety of different devices. We want to use the OAuth2 spec as it defines several flows which were not available in the original OAuth spec. My question is, what flow would work best for a mobile device such as the iPhone or iPad? What flow does an application like TweetDeck use? Looking around the web it seems clients like TweetDeck use the 'Username and Password Credentials Flow" (browserless token exchange). Can anyone provide more information on this topic?

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• AutoKey - clipboard.get_selection() function fails on certain strings

  - by LonnieBest

  I've simplified my script so you can focus on the essence my problem. In AutoKey (not AutoHotKey), I made a Hot-Key (shift-alt-T) that performs this script on any string I have highlighted (like in gedit for example -- but any other gui editor too). strSelectedText = clipboard.get_selection() keyboard.send_keys(" " + strSelectedText) The script modifies the highlighted text and adds a space to the beginning of the string. It works for most strings I highlight, but not this one: * Copyright © 2008–2012 Lonnie Best. Licensed under the MIT License. It works for this string: * Add a Space 2.0.1 but not on this one: * Add a Space 2.0.1 – At the python command prompt, it has no problem any of those strings, yet the clipboard.get_selection() function seems to get corrupted by them. I'm rather new to python scripting, so I'm not sure if this is an AutoKey bug, or if I'm missing some knowledge I should know about encoding/preparing strings in python. Please help. I'm doing this on Ubuntu 12.04: sudo apt-get install autokey-qt

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• JavaScript: Change to Absolute Positioning

  - by Doug

  I'm trying to center a page on any resolution while still being able to use absolute positioning to move pictures. I figure that the best way would be to have a table positioned relatively in the beginning in the center of the page, then change it to absolute positioning in the onload of the page. I think the correct line is: document.getElementById("Object").style.position = "absolute"; However, I put an alert box after it asking where the left side of the object is, I get undefined. But, if I directly assign it to a position (Object.style.left = 500) I will get that number. So I can assign it a value, meaning it is in absolute position, but I cannot pull a value out of that. Kind of confusing but hopefully it makes sense and someone knows what to do. Thanks.

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• Dynamicly Inject img alt attribute jQuery

  - by Brock

  I need some help, and before we get going, I know it is probably not best practice, but I am doing some maintenance to an existing site and need to accomplish the following for a fix. <a rel="lightbox" href="site.com" title="a generated title"><img src="site.com/img" class="post-image" alt="a long description"/></a> Okay, so I am trying to figure out how to use jQuery or any other method to take the "alt" attribute from my image, and dynamically overwrite the "title" attribute of my "a" tag. Any help would be awesome, I am kinda lost at this juncture.

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• XSLT: How to escape square brackets in Urls

  - by ilariac

  I have a set of records from Solr where field[@name='url'] can have the following format: http://url/blabla/blabla.aspx?sv=[keyword%20keyword,%201] My understanding is that the square brackets denote an array syntax and I would like to use XSLT to remove the square brackets from all Urls. The reason for this is that I am using an Open URL resolver, which does not currently handle well those characters. The best option would be to strip the square brackets from all URLs before such resources are mediated by the Open URL resolver. There are cases where I have multiple occurrences of square brackets per Url. Can you please help me with this? Thanks for your help, I.

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• How to protect web site against hackers?

  - by Adi barda

  Hi Guys, Like everyone of us, I have my own dreams about developing the next cool product that will be adopted by many users and become industry standard. Surprisingly, I find that the most challenging task is to keep my website up & running. My site is being hacked again and again no matter what I do - I blocked the FTP connections, changed the Joomla (CMS) database table names, installed all latest patches and what not. The web site supports the product (over 1800 users now...) by generating licenses, support forums, documentation, galleries etc. The product which is a winforms application cannot be marketed without this web site. My question: Do you have any innovative idea about securing joomla based web sites or what is the best secured web hosting you know. currently i'm hosting my site at ixwebhosting and i like them very much but obviously i can't do any serious marketing being hacked over and over again Thank you very much, Adi Barda

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• Stand - alone application with JBoss or Tomcat

  - by sufoid

  Hallo, I have a more specific question about deploying a Java-application. I have created a Java application, it is a WAR file and can be installed on any Java application server. This works perfect. Now for users who do not have Java experience I want to package somehow my application together with the application server and distribute it as a stand-alone version. Question 1: Is this possible? Question 2: Which application server would be best for this? Question 3: Where should I start to learn how to do this? Do you have any experience you can share with me. Thanks.

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• Solving iPhone/iPad out of memory issues

  - by Joonas Trussmann

  I have a strange issue where I'm scrolling through a paged UIScrollView which displays the pages of a PDF document (using Quartz 2D and CATiledLayer). When I page through memory allocation looks fine with it going up with a few initial pages and then keeping it steady as it obviously releases the memory kept for earlier pages. Upon hitting page x (not a certain PDF page or a certain number per se) memory usage goes from a couple of megs to 308 megs and the app crashes. So my question is: how to best try to find what's causing this? The object alloc tool in instruments shows the memory as simply going to malloc. (in huge chunks).

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• Getting websites to detect our mobile browser

  - by Chromatix

  I've been asked to find out a sensible way to make the majority of popular websites detect our browser - which is functionally complete, but is running on rather constrained hardware - as a "mobile" browser. The idea is that the heaviest popular websites seem to have mobile versions, which render much faster and fit better on the screen. I've looked at the inverse question, which tells me that there isn't an obvious standard way of doing it - http://www.brainhandles.com/techno-thoughts/detecting-mobile-browsers is a case in point. This is borne out by looking at a variety of User-Agent strings from popular mobile and desktop browsers. So far the best idea we can come up with is to add "Mobile" to the string somewhere, since this is the main visible difference between Safari for iPad/iPhone and for Windows/Mac. Does anyone have a better idea?

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