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  • Proper way to return an array

    - by Ward
    Hey there, I never seem to get this right. I've got a method that returns a mutable array. What is the proper way to return the array and avoid potential memory leaks? If I plan to store the results locally inside another view controller, does that affect the way the array should be returned? Lastly, what if it's just an non-mutable array? Does that require a different technique? thanks, Howie

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  • Improper integral calculation using numerical intergration

    - by Andrei Taptunov
    I'm interested in calculation of Improper Integral for a function. Particularly it's a Gauss Integral. Using a numerical integration does make sense for a definite integrals but how should I deal with improper integrals ? Is there any was to extrapolate the function "around" negative infinity or should I just remove this part and start integration from some particular value because cumulative sum near "negative infinity" is almost non-existent for Gauss integral? Perhaps there are some algorithms that I'm not aware about.

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  • Asynchronous readback from opengl front buffer using multiple PBO's

    - by KillianDS
    I am developing an application that needs to read back the whole frame from the front buffer of an openGL application. I can hijack the application's opengl library and insert my code on swapbuffers. At the moment I am successfully using a simple but excruciating slow glReadPixels command without PBO's. Now I read about using multiple PBO's to speed things up. While I think I've found enough resources to actually program that (isn't that hard), I have some operational questions left. I would do something like this: create a series (e.g. 3) of PBO's use glReadPixels in my swapBuffers override to read data from front buffer to a PBO (should be fast and non-blocking, right?) Create a seperate thread to call glMapBufferARB, once per PBO after a glReadPixels, because this will block until the pixels are in client memory. Process the data from step 3. Now my main concern is of course in steps 2 and 3. I read about glReadPixels used on PBO's being non-blocking, will this be an issue if I issue new opengl commands after that very fast? Will those opengl commands block? Or will they continue (my guess), and if so, I guess only swapbuffers can be a problem, will this one stall or will glReadPixels from front buffer be many times faster than swapping (about each 15-30ms) or, worst case scenario, will swapbuffers be executed while glReadPixels is still reading data to the PBO? My current guess is this logic will do something like this: copy FRONT_BUFFER - generic place in VRAM, copy VRAM-RAM. But I have no idea which of those 2 is the real bottleneck and more, what the influence on the normal opengl command stream is. Then in step 3. Is it wise to do this asynchronously in a thread separated from normal opengl logic? At the moment I think not, It seems you have to restore buffer operations to normal after doing this and I can't install synchronization objects in the original code to temporarily block those. So I think my best option is to define a certain swapbuffer delay before reading them out, so e.g. calling glReadPixels on PBO i%3 and glMapBufferARB on PBO (i+2)%3 in the same thread, resulting in a delay of 2 frames. Also, when I call glMapBufferARB to use data in client memory, will this be the bottleneck or will glReadPixels (asynchronously) be the bottleneck? And finally, if you have some better ideas to speed up frame readback from GPU in opengl, please tell me, because this is a painful bottleneck in my current system. I hope my question is clear enough, I know the answer will probably also be somewhere on the internet but I mostly came up with results that used PBO's to keep buffers in video memory and do processing there. I really need to read back the front buffer to RAM and I do not find any clear explanations about performance in that case (which I need, I cannot rely on "it's faster", I need to explain why it's faster). Thank you

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  • How Does Failover Clustering Work in Windows 2008 R2?

    - by Kyle Brandt
    I am trying to learn how the failover clustering features works with Windows 2008 R2 as I am going to be using as part of SQL Server 2012 always on. I have been able to find information on how to set it up, and what it does. However, I am having trouble finding a nice technical document on how it actually works in detail (For example with keepalived there are docs that explain how often are heartbeat packets sent, what they look like etc). I know this is a pretty broad question, but I would like to have a good understanding of mechanisms of this feature.

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  • how to merge stripped symbols with binary?

    - by Bernd Schmickler
    I compiled the Qt Framework with debugging enabled, but the script stripped the debugging symbols from the libraries and saved them as *.debug files -- just like here. Sadly I need these symbols inside the .so files, so I can continue working with them. There seems no way to teach my debugger to load external (non-PDB) symbols. So another way of solving my problem might be converting the .debug files to PDB format, which might also be a problem. Thank you very much!

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  • Fast, lightweight HTML parser for C++

    - by Jen
    I'm looking for a fast, lightweight open-source HTML parser -- something along the lines of a non-validating SAX parser (except, of course, for HTML). The answers to this question cover a parser that generates a DOM (don't want that), and these answers suggest conforming the HTML to XML before sending it to Xerxes (can't do that in my case). Any suggestions?

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  • Can Rational Team Concert and IntelliJ coexist?

    - by Paul McKenzie
    I am a long time intellij user. The company where I work is likely to introduce Rational Team Concert to our department shortly. I went to the RTC demo and it looks like a reasonable product, built around Eclipse, but I would rather not give up using IntelliJ. Does anyone have experience of using non-eclipse IDEs with RTC?

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  • Cocos2d: Move a Sprite along a path/bezier ?

    - by eemceebee
    Hi I need to move a sprite from one CGPoint to another using Cocos2d for the Iphone. The problem is that the animation should be along a bezier. Basically I would use this : id move = [CCMoveTo actionWithDuration:.5f position:ccp(100,200)]; [sprite runAction:move]; Now how can I do this in a non linear path ? Thx

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  • What are the disadvantages to declaring Scala case classes?

    - by Graham Lea
    If you're writing code that's using lots of beautiful, immutable data structures, case classes appear to be a godsend, giving you all of the following for free with just one keyword: Everything immutable by default Getters automatically defined Decent toString() implementation Compliant equals() and hashCode() Companion object with unapply() method for matching But what are the disadvantages of defining an immutable data structure as a case class? What restrictions does it place on the class or its clients? Are there situations where you should prefer a non-case class?

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  • How to cache method results in .Net

    - by SP
    Using webmethods, caching the results is pretty straight forward using "CacheDuration" attribute. Is there a similar "easy" way to cache non-webmethod outputs (or static methods) based on the parameters? I would appreciate any help. Thanks in advance!

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  • Psuedo LRU tree algorithm.

    - by patros
    A lot of descriptions of Pseudo LRU algorithms involve using a binary search tree, and setting flags to "point away" from the node you're searching for every time you access the tree. This leads to a reasonable approximation of LRU. However, it seems from the descriptions that all of the nodes deemed LRU would be leaf nodes. Is there a pseudo-LRU algorithm that deals with a static tree that will still perform reasonably well, while determining that non-leaf nodes are suitable LRU candidates?

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  • BizTalk FTP - File Rename

    - by Rob Bowman
    Hi I need to send files using the BizTalk 2006 (non wcf) FTP adapter. After successful transmission of each file it needs to be renamed from an "A" prefix to a "U" prefix. I don't want to issue a command using wildcards because I can't be sure of other files in the destination folder. Any ideas? Thanks Rob.

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  • Append class="external" to external links.

    - by K3
    What is the php code to append class="external" to links that are posted and are not the domain. For example my site is www.mysite.com and you post a link to www.mysite.com/news and a link to www.yoursite.com How do I set it so only non "mysite.com" links have the class specified?

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  • ASP.NET MVC - Localization route

    - by ropstah
    Hi, i'd like to create localized URL's for my site. They should obviously point to the same controller actions, but I want the first routevalues to -always- be the location/language specification. Is this possible? http://www.website.com/en/us/controller/action http://www.website.com/en/gb/controller/action I understand it can be done by defining {language} and {location} in every route, but i'm looking for a slick, non-hacky solution.

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  • Howcan I get started with Spring Batch?

    - by C. Ross
    I'm trying to learn Spring Batch, but the startup guide is very confusing. Comments like You can get a pretty good idea about how to set up a job by examining the unit tests in the org.springframework.batch.sample package (in src/main/java) and the configuration in src/main/resources/jobs. aren't exactly helpful. Also I find the Sample project very complicated (17 non-empty Namespaces with 109 classes)! Is there a simpler place to get started with Spring Batch?

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  • Cannot activate Windows 8 build 9200

    - by Luke Puplett
    I'm running an MSDN build 9200 of Windows 8 N (Europe), and thought it was the RTM - I don't go for beta OSes, generally speaking. Anyway, this gold code version runs a watermark, which makes me suspicious. I can't activate it. It just maintains the message: Windows can't activate at the moment. Try activating Windows later. If this issue persists, contact your system administrator or technical support department for assistance. So I phoned myself and the guy at the other end was useless, kept talking over me. Should I be able to activate this build or did I download the wrong version? Luke

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  • How does one build Mono with only the ECMA covered parts?

    - by Zifre
    I'm trying to figure out how to build Mono without the patented, non ECMA components, such as Winforms. Miguel de Icaza said that Mono would be split in two, so that we could build only the parts under Microsoft's Community Promise. It doesn't seem like this has happened yet. Is there any way to do this yet?

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  • Coda slider from within Tabbed Ajax?

    - by voyageur
    Hi I am trying to use a simple Jquery Coda slider (that works fine alone) inside one of the tabs in the Jquery Tools Tabbed Ajax. When I click that tab, it is empty ! while it actually display the Coda slider. The tab page is exactly the same as the one on Jquery Tools site: Tabs demo 11 / 13 : Loading tab contents with AJAX The Coda slider is: <div class="coda-slider-wrapper"> <div class="coda-slider preload" id="coda-slider-1"> <div class="panel"> <div class="panel-wrapper"> <h2 class="title">Panel 1</h2> <p>This slider uses default settings.</p> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas metus nulla, commodo a sodales sed, dignissim pretium nunc. Nam et lacus neque. Sed volutpat ante id mauris laoreet vestibulum. Nam blandit felis non neque cursus aliquet. Morbi vel enim dignissim massa dignissim commodo vitae quis tellus. Nunc non mollis nulla. Sed consectetur elit id mi consectetur bibendum. Ut enim massa, sodales tempor convallis et, iaculis ac massa. Etiam suscipit nisl eget lorem pellentesque quis iaculis mi mattis. Aliquam sit amet purus lectus. Maecenas tempor ornare sollicitudin.</p> </div> </div> <div class="panel"> <div class="panel-wrapper"> <h2 class="title">Panel 2</h2> <p>Proin nec turpis eget dolor dictum lacinia. Nullam nunc magna, tincidunt eu porta in, faucibus sed magna. Suspendisse laoreet ornare ullamcorper. Nulla in tortor nibh. Pellentesque sed est vitae odio vestibulum aliquet in nec leo.</p> </div> </div> Help is very much appreciated, and thanx.

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  • Safari and the z-index flash problem

    - by Zakaria
    Hi everybody, I don't know if it's a classic safari 4 bug, but apparently many people cannot display correctly a non-flash content (div, image, etc.) over a flash animation. I tried everything: The wmode (switching from "opaque" to "transparent"), the z-index and many other div "cheats". Did anyone know if there is a safari 4 patch/trick/script to fix this problem? Thank you very much, regards.

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  • Darkening a UIView

    - by igul222
    I'd like to "darken" a UIView by a certain amount. Right now, I'm doing the darkening like this: UIView *overlay = [[UIView alloc] initWithFrame:mainView.bounds]; overlay.backgroundColor = [UIColor blackColor]; overlay.alpha = 0.5f; [mainView addSubview:overlay]; Unfortunately, this also adds a semi-transparent black overlay to parts of mainView that are transparent. Is there any way to only darken the non-transparent sections?

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  • Simple Fundamental Algorithm Question, binary tree traversal

    - by Ben
    I'm trying to explain to non-computer science major student with many questions. (1)What traverses tree? Is it just logic or actual on off switch generates 1s and 0s traveling the circuit board? where is this tree and node exists CPU/Memory in between? (2)If it is 1s and 0s HOW the circuits understand the line for example p=p.getLeft(); I said search the google or wiki.

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