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  • Design pattern for isomorphic trees

    - by Peregring-lk
    I want to create a data structure to work with isomorphic tree. I don't search for a "algorithms" or methods to check if two or more trees are isomorphic each other. Just to create various trees with the same structure. Example: 2 - - - - - - - 'a' - - - - - - - 3.5 / \ / \ / \ 3 3 'f' 'y' 1.0 3.1 / \ / \ / \ 4 7 'e' 'f' 2.3 7.7 The first "layer" or tree is the "natural tree" (a tree with natural numbers), the second layer is the "character tree" and the third one is the "float tree". The data structure has a method or iterator to traverse the tree and to make diferent operations with its values. These operations could change the value of nodes, but never its structure (first I create the structure and then I configure the tree with its diferent layers). In case of that I add a new node, this would be applied to each layer. Which known design pattern fits with this description or is related with it?

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  • Stand-Up Desk 2012 Update

    - by BuckWoody
    One of the more popular topics here on my technical blog doesn't have to do with technology, per-se - it's about the choice I made to go to a stand-up desk work environment. If you're interested in the history of those, check here: Stand-Up Desk Part One Stand-Up Desk Part Two I have made some changes and I was asked to post those here.Yes, I'm still standing - I think the experiment has worked well, so I'm continuing to work this way. I've become so used to it that I notice when I sit for a long time. If I'm flying, or driving a long way, or have long meetings, I take breaks to stand up and move around. That being said, I don't stand as much as I did. I started out by standing the entire day - which did not end well. As you can read in my second post, I found that sitting down for a few minutes each hour worked out much better. And over time I would say that I now stand about 70-80% of the day, depending on the day. Some days I don't even notice I'm standing, so I don't sit as often. Other days I find that I really tire quickly - so I sit more often. But in both cases, I stand more than I sit. In the first post you can read about how I used a simple coffee-table from Ikea to elevate my desktop to the right height. I then adjusted the height where I stand by using a small plastic square and some carpet. Over time I found this did not work as well as I'd like. The primary reason is that the front of these are at the same depth - so my knees would hit the desk or table when I sat down. Also, the desk was at a certain height, and I had to adjust, rather than the other way around.  Also, I like a lot of surface area on top of a desk - almost more of a table. Routing cables and wiring was a pain, and of course moving it was out of the question.   So I've changed what I use. I found a perfect solution for what I was looking for - industrial wire shelving: I bought one, built only half of it (for the right height I wanted) and arranged the shelves the way I wanted. I then got a 5'x4' piece of wood from Lowes, and mounted it to where the top was balanced, but had an over-hang  I could get my knees under easily.My wife sewed a piece of fake-leather for the top. This arrangement provides the following benefits: Very strong Rolls easily, wheels can lock to prevent rolling Long, wide shelves Wire-frame allows me to route any kind of wiring and other things all over the desk I plugged in my UPS and ran it's longer power-cable to the wall outlet. I then ran the router's LAN connection along that wire, and covered both with a large insulation sleeve. I then plugged in everything to the UPS, and routed all the wiring. I can now roll the desk almost anywhere in the room so that I can record, look out the window, get closer to or farther away from the door and more. I put a few boxes on the shelves as "drawers" and tidied that part up. Even my printer fits on a shelf. Laser-dog not included - some assembly required In the second post you can read about the bar-stool I purchased from Target for the desk. I cheaped-out on this one, and it proved to be a bad choice. Because I had to raise it so high, and was constantly sitting on it and then standing up, the gas-cylinder in it just gave out. So it became a very short stool that I ended up getting rid of. In the end, this one from Ikea proved to be a better choice: And so this arrangement is working out perfectly. I'm finding myself VERY productive this way. I hope these posts help you if you decide to try working at a stand-up desk. Although I was skeptical at first, I've found it to be a very healthy, easy way to code, design and especially present over a web-cam. It's natural to stand to speak when you're presenting, and it feels more energetic than sitting down to talk to others.

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  • Grand Theft Auto IV – Awesome Ghost Rider Mod [Videos]

    - by Asian Angel
    Recently we shared the video for a terrific Back to the Future GTA IV mod with you and today we are back with videos for a wicked Ghost Rider mod. One thing is sure, with Ghost Rider cruising through town the nights in Liberty City have never been hotter! Note: Videos contain some language that may be considered inappropriate. The first video focuses on the main working mod while the second focuses on the new ‘Wall Ride’ feature that sees Ghost Rider going up and down walls. How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • How do I store the OAuth v1 consumer key and secret for an open source desktop Twitter client without revealing it to the user?

    - by Justin Dearing
    I want to make a thick-client, desktop, open source twitter client. I happen to be using .NET as my language and Twitterizer as my OAuth/Twitter wrapper, and my app will likely be released as open source. To get an OAuth token, four pieces of information are required: Access Token (twitter user name) Access Secret (twitter password) Consumer Key Consumer Secret The second two pieces of information are not to be shared, like a PGP private key. However, due to the way the OAuth authorization flow is designed, these need to be on the native app. Even if the application was not open source, and the consumer key/secret were encrypted, a reasonably skilled user could gain access to the consumer key/secret pair. So my question is, how do I get around this problem? What is the proper strategy for a desktop Twitter client to protect its consumer key and secret?

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  • Trouble switching to Dvorak on Ubuntu 12.04

    - by Dodgie
    I've decided to switch to Dvorak on my Ubuntu machine, but I'm having some trouble: First, I attempted to do this through the GUI -- System Settings - Keyboard Layout - add layout (plus sign) - English(programmer Dvorak). This didn't work at first, so I restarted my machine. It seemed to work at the password prompt (if only because QWERTY did not), but I couldn't get it to accept my password. I used the virtual keyboard option to enter my password with mouse clicks (the virtual keyboard was using the programmer's Dvorak Standard) and was able to get in that way. Once logged in, however, I was back to QWERTY. Second, I tried to switch on the command prompt -- $ loadkeys /usr/lib/kbd/keytables/dvorak.map The error message I received was "Couldn't get a file descriptor referring to the console " Does anyone know what I'm doing wrong? I've looked for a solution for these problems, but couldn't find anything.

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  • C# XNA - Sky Sphere Question

    - by Wade
    I have been banging my head against the wall trying to get a sky sphere to work appropriately in XNA 4.0. I have the sphere loading correctly, and even textured, but i would like something a little more dynamic that can support a day/night cycle. My issue is that, while i know a good amount of C# and XNA, i know next to nothing about HLSL. (I could make an ambient light shader if my life depended on it...) I also have not been able to find a tutorial on how to build a sky sphere like this. Of course i don't expect to be able to make an amazing one right off the bat, i would like to start small, with a dynamic coloring sky i'll work out the clouds and sun later. My first question: Does anyone know of any good tutorial sites that could help me get a decent grasp around HLSL? Second: Does anyone have a good example of or know where to find one of a gradient sky using XNA and C#?

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  • How do I add a custom launcher?

    - by sayth
    I started by searching guides. I found this guide but neither of the main methods works anymore in 11.10. The first solution, I have created the desktop file, however the file location given as .gconf-> desktop-> unity-> launcher -> favourites no longer exists. I can get to /home/sayth/.gconf/desktop but there is no longer a unity folder. The second solution described right-clicking the desktop and creating a launcher. Right-clicking the desktop no longer produces a "create a launcher" option. I manually installed geany 0.21 as the one in the repo's is outdated. It's installed and working correctly, and is executing from /usr/local/bin/geany. How can I add it to the launcher?

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  • Python C API return more than one value / object without building a tuple [migrated]

    - by Grisu
    I got the following problem. I have written a C-Extension to Python(2.7 / 3.2) to interface a self written software library. Unfortunately I need to return two values from the function where the last one is optional. In Python I tried def func(x,y): return x+y, x-y test = func(13,4) but test is a tuple. If I write test1,test2 = func(13,4) I got both values separated. Is there a possibility to return only one value without unpacking the tuple, i.e. the second(,.. third, ..fourth) value gets neglected? And if such a solution existst, how does it look for the C-API? Because return Py_BuildValue("ii",x+y,x-y); results in a tuple as well.

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  • Teaching logical/analytical thinking

    - by Joshua
    I have been trial running a club in which I teach programming for the past year and while they have progressed what they really lack is the most fundamental concept to programming, analytical thinking. As I now approach the second year of teaching to the children (aged 12 - 14) I am now realising that before I begin teaching them the syntax and how to actually program an app (or what they would rather, a game) I need to introduce them to analytical thinking first. I have already found Scratch and similar things such as Light-Bot and will most certainly be using the, to teach them how to implement their logical thinking but what I really need are some tips or articles on how to teach analytical thinking itself to children aged 12 - 14. What I'm looking for are some ideas on how to teach the kind of thinking that these kids will need in order to get them into programming, whether that be analytical, logical or critical. How and what should I teach them relating to the way their minds need to be wired when programming solutions to problems?

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  • Simultaneous Animation for a GameObject - Unity3D

    - by Fahim Ali Zain
    Its my second week with Unity. I am doing a 2D game and I have a small GameObject which should change its sprite along with following a definite path defined in Animation Curves. I did both of them in separate .anim files since the transform animation had many keyframes, i thought it wont be good to put the '2' sprite keyframe repeatedly along side the transform keyframe. But the problem is, I cant get it both working together at the same time. I dont want any blending because the animation is timed well already. Also, I tried deleting the sprite change animation and tried it under script changing the SpriteRenderer.Sprite property under Update(); but it works only when the Animator component is disabled in the GameObject. Any Solutions ? :)

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  • A* Jump Point Search - how does pruning really work?

    - by DeadMG
    I've come across Jump Point Search, and it seems pretty sweet to me. However, I'm unsure as to how their pruning rules actually work. More specifically, in Figure 1, it states that we can immediately prune all grey neighbours as these can be reached optimally from the parent of x without ever going through node x However, this seems somewhat at odds. In the second image, node 5 could be reached by first going through node 7 and skipping x entirely through a symmetrical path- that is, 6 -> x -> 5 seems to be symmetrical to 6 -> 7 -> 5. This would be the same as how node 3 can be reached without going through x in the first image. As such, I don't understand how these two images are not entirely equivalent, and not just rotated versions of each other. Secondly, I'd like to understand how this algorithm could be generalized to a three-dimensional search volume.

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  • Unity Bar auto-hide behaviour and application icons placement

    - by Andrei
    The first issue: It seems that sometimes when I hover to the left edge of the screen the Unity Bar will not stay on top of other windows even if I continue to hover the cursor above it, at other times it will stay on top. Is this a normal behaviour? Or am I affected by some bug / inconsistency? If it's normal, what's the logic behind it? The second issue: Application icons for running applications do not maintain their position in the Unity Bar but instead move around according to some weird rules (if any?) that I can't understand. Is this to be expected, or is it a bug? Is there a way to force them to stop moving around? I like to see certain apps in certain positions and this bothers me.

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  • Star Trail Photos Taken from the International Space Station

    - by Jason Fitzpatrick
    While most people have seen a star trail photo or two, seeing a set of star trail photos taken from over 300 miles above the Earth’s surface is a treat. Courtesy of Astronaut and Expedition 31 Flight Engineer Don Pettit, the photos capture star trails from the vantage point of the International Space Station. He explains his technique: My star trail images are made by taking a time exposure of about 10 to 15 minutes. However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then ‘stack’ them using imaging software, thus producing the longer exposure. Hit up the link below for the full Flickr set of the star trails. ISS Star Trails [via Smithsonian Magazine] HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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  • Fan running constantly on a Dell D420 laptop

    - by Halik
    I'm running latest Ubuntu 12.04 beta on a Dell D420 laptop. The fan is spinning almost constantly - even after turning the PC off, letting it cool down, and then turning it back on, the fan will turn on after some idle time. Not to mention any CPU work. The CPU temps are normal, in range of 50-55 idle, and up to 70 with some load. It wouldn't be an issue, but the same PC running Fedora, or Arch Linux, had a much more modest fan profile - the temps were managed while you seldom heard the fan. To counter the problem, I currently use i8k tools, set manual temperature thresholds which seemed to have worked, but the i8kmon has a tendency to cycle the fan between lower and higher state within aboutin a second intervals - which is extremely annoying. As far as I can tell I did not run any special software (beside laptop-mode-tools), or any additional kernel modules when running Arch Linux and I can't tell about Fedora.

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  • RESIZE casper-rw

    - by Oldrifle
    UsING Toporesize-0.7.1 FLash drive is Transcent I want to add all unused space to casper-rw. Disk=3.72GB 2.68 used 1.GB casper-rw=1.95GB caspe=681MG I boot UBUNTU 11.10 64bit and see that size of HOME is about half of casper-rw It is working from flash drive ok. But I was not able to boot 11.10 64bit using USB 3.0 HDD. UBUNTU 11.10 32 bit on usb 2.0 HDD works ok ( currently multiboot with openSUSE) FUDUNTU 2012 on usb 3.0 hdd VERY FAST. Fast USB 3.0 8GB unit is ready. partitioned. Second part is labeled as casper-rw. Will try to install using partitions as base and home.No swap since I have 8GB ram. ANY SUGGESTION? Thanks

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  • Is title tag position relevant in html pages?

    - by webose
    I'd like know if having the title tag positioned at the end of <head> tag or in any other position, always inside the <head></head>, can lead to some kind of problem, I'm not talking about SEO stuffs, I'm talking about standards, browser rules, web application rules, or something like this. I'd like to load a page from two different php file like this, is it a wrong way? <!-- file1.php --> <html> <head> .... <!-- file2.php --> <title><?php echo($var)?> </head> <body> ... <head> tag is not closed, because with the second file I dynamically add the <title> tag.

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  • Membership in ASP.Net applications - part 2

    - by nikolaosk
    This is the second post in a series of posts regarding ASP.Net built in membership functionality,providers,controls. You can read the first one post one here . In order to follow this post, complete the steps in the first post. It will only take 10 minutes or so. 1) Launch Visual Studio 2005,2008/2010. Express editions will work fine. I am using Visual Studio 2010 Ultimate edition. 2) Follow all the steps in the first post of the series. 3) Run your application to make sure it runs. 4) Change the...(read more)

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  • Setting up UPS monitoring

    - by Andrew Heath
    I have acquired a second hand Uninterrupted Power Supply (UPS) that I have refurbished (new battery) and hope to use with my Ubuntu 12.10 system. It's a SOLA 330 with serial out. I have installed NUT Metapackage and NUT Monitor from Software Centre, but am not sure how to go about setting it all up. A Google search brings up several ways of configuring Network UPS Tools (NUT) or HAL-Drivers, however, HAL-Drivers appears to be obsolete and many commands and config files mentioned to edit do not exist in 12.10 or the current version of NUT (most articles are a few years old). One tutorial seemed to work except the Error: no UPS definitions found in ups.conf even though ups.conf has values in it as laid out in the tutorial. How do I go about setting my system to monitor the UPS for a shut down signal? Also, is there a command to determine the UPS is communicating through the serial connection and on what port (to help with setup and configuring, eg. /dev/ttyS0 is mentioned in one of the tutorials I read).

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  • Use a template to get alternate behaviour?

    - by Serge
    Is this a bad practice? const int sId(int const id); // true/false it doesn't matter template<bool i> const int sId(int const id) { return this->id = id; } const int MCard::sId(int const id){ MCard card = *this; this->id = id; this->onChange.fire(EventArgs<MCard&, MCard&>(*this, card)); return this->id; } myCard.sId(9); myCard.sId<true>(8); As you can see, my goal is to be able to have an alternative behaviour for sId. I know I could use a second parameter to the function and use a if, but this feels more fun (imo) and might prevent branch prediction (I'm no expert in that field). So, is it a valid practice, and/or is there a better approach?

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  • Facebook Game Rejected: "Your app icon must not overlap with content in your cover image"

    - by peterwilli
    Sorry if this isnt the right stackexchange site to ask this, it was really hard to determine. My FB game just recently got rejected for 2 reasons. The first I fixed nicely and is irrelevant but the second I just can't see to figure out what they mean and I was hoping someone else got the same issue and did know what they meant. These are the errors: You can ignore the error under "Banners" The web preview of my game looks like this now: All I know is that the rejection has something to do with the cover image, not the icons or the screenshots. Please let me know what to do to get approved. Thanks a lot!

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  • 12.04 Random sounds sometimes after startup

    - by Timothy Duane
    I'm not quite sure what the sound is, but it has only started happening in the last two days. The only way I can describe it would be that it sounds like a wooden xylophone being tapped lightly. It will play at random intervals ranging between 1 second to a couple minutes for up to a half hour (from what I have noticed) after startup. If anybody has any ideas as to what is causing this or how to fix it I would appreciate it. System information: Computer: Toshiba Satellite L655-S5160 Audio Driver: Conexant Audio Driver(v4.119.0.60; 07-14-2010; 41.89M)

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  • Microsoft SQL Server 2008 R2 Release

    - by Leonard Mwangi
    Microsoft is planning to release the second edition of SQL Server 2008, the new edition will named SQL Server 2008 R2 due to be released by May 1st 2010.   Amongst the change on the edition is pricing which is anticipated to go up by 25% for the Standard Edition and about 15% for the Enterprise Edition. As for the features, there are some very cool additions  including PowerPivot for SharePoint, Master Data Services and Multi-Server Administration. There is also enhancements on the Database Engine, Reporting Services and Installation Process.    More information can be found at http://msdn.microsoft.com/en-us/library/bb500435(SQL.105).aspx   Have a happy Upgrade

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  • The How-To Geek Guide to Audio Editing: Basic Noise Removal

    - by YatriTrivedi
    Laying down some vocals?  Starting your own podcast?  Here’s how to remove noise from a messy audio track in Audacity quickly and easily. This is the second part in our series covering how to edit audio and create music using your PC. Be sure to check out the first part in the series, where we covered the basics of using Audacity, and then check out how to add MP3 format support as well Latest Features How-To Geek ETC HTG Projects: How to Create Your Own Custom Papercraft Toy How to Combine Rescue Disks to Create the Ultimate Windows Repair Disk What is Camera Raw, and Why Would a Professional Prefer it to JPG? The How-To Geek Guide to Audio Editing: The Basics How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 Take Better Panoramic Photos with Any Camera Make Creating App Tabs Easier in Firefox Peach and Zelda Discuss the Benefits and Perks of Being Kidnapped [Video] The Life of Gadgets in Price and Popularity [Infographic] Apture Highlights Turns Your Cursor into a Search Tool Add Classic Sci-Fi Goodness to Your Desktop with the Matrix Theme for Windows 7

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  • What is the etiquette in negotiating payment for a software development job

    - by EpsilonVector
    The reason I'm taking a general business question and localize it to software development is that I'm curious as to whether there are certain trends/etiquette/nuances that are typical to our industry. For example, I can imagine two different attitudes employers may generally have to payment negotiations: 1) we'll give you the best offer so we can't really be flexible about it because we already pretty much gave you everything we can give you, or 2) we'll give him an average offer and give in to a better one if forced to. If you try to play hard ball in the first attitude it'll probably cost you the job because you ask for more than they can give you, however if you don't insist on better payment in the second one you'll get a worse offer. In short, when applying to a typical job in our industry what are the typical attitudes from employers on the offers they give, what is the correct way to ask for a better payment, do these things differ between different types of companies (for example startups vs well entrenched companies), and how do these things differ between different kinds of applicants (graduate vs student)?

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  • Why prefer a wildcard to a type discriminator in a Java API (Re: Effective Java)

    - by Michael Campbell
    In the generics section of Bloch's Effective Java (which handily is the "free" chapter available to all: http://java.sun.com/docs/books/effective/generics.pdf), he says: If a type parameter appears only once in a method declaration, replace it with a wildcard. (See page 31-33 of that pdf) The signature in question is: public static void swap(List<?> list, int i, int j) vs public static void swap(List<E> list, int i, int j) And then proceeds to use a static private "helper" function with an actual type parameter to perform the work. The helper function signature is EXACTLY that of the second option. Why is the wildcard preferable, since you need to NOT use a wildcard to get the work done anyway? I understand that in this case since he's modifying the List and you can't add to a collection with an unbounded wildcard, so why use it at all?

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