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  • C# - Fast and simple multi dimensional data structures?

    - by Jeremy Rudd
    I need to store multi-dimensional data consisting of numbers in a manner thats easy to work with. I'm capturing data in real time, and once processed I would destroy and GC older data. This data structure must be fast so it won't hit my overall app performance. The faster the better. What are my choices in terms of platform supported data structures? I'm using VS 2010. and .NET 4.

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  • Two-pass multi way merge sort?

    - by Nimesh
    If I have a relation (SQL) that does not fit in memory and I want to sort the relation using TPMMS (Two-pass multi-way merge sort method). How would I divide the table in sub tables (and how many) that can fit in memory and than merge them? Let's say I am using C#.

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  • Django1.1 file based session backend multi-threaded solution

    - by Satoru.Logic
    Hi, all. I read django.contrib.sessions.backend.file today, in the save method of SessionStore there is something as the following that's used to achieve multi-threaded saving integrity: output_file_fd, output_file_name = tempfile.mkstemp(dir=dir, prefix=prefix + '_out_') renamed = False try: try: os.write(output_file_fd, self.encode(session_data)) finally: os.close(output_file_fd) os.rename(output_file_name, session_file_name) renamed = True finally: if not renamed: os.unlink(output_file_name) I don't quite understand how this solve the integrity problem.

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  • Security concerns for a multi-lingual web application.

    - by The Rook
    I am converting a PHP MySQL web application written for English language into a Multi-Language site. Do you know any vulnerabilities that affect web applications in another language? Or perhaps vulnerabilities that could be introduced in the conversion of code base to support multiple languages. (If you know any vulnerabilities of this type in another programming language I'll give you a +1)

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  • Confusion in multi dimensional array in Java

    - by Alvin
    Hello, I'm not able to understand the following multi-dimensional code. Could someone please clarify me? int[][] myJaggedArr = new int [][] { new int[] {1,3,5,7,9}, new int[] {0,2,4,6}, new int[] {11,22} }; May I know how it is different from the following code? int[][] myArr = new int [][] { {1,3,5,7,9}, {0,2,4,6}, {11,22} };

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  • "Multi-threading" w/ NSTimers in an iPhone app

    - by MrDatabase
    Say I have two NSTimers in my iPhone app: timer1 and timer2. timer1 calls function1 30 times per second and timer2 calls function2 30 times per second. Assume these two functions are reading and updating the same integer variables. Are there any "multi-threading" issues here? If not how does iPhone OS handle the execution of the two functions (in general)?

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  • Multi Module Project - Assembly plugin

    - by user209947
    I am using Maven 2.0.9 to build a multi module project. I have defined the assembly plugin in my parent pom. I can get my assemblies built using mvn install assembly:assembly This command runs the tests twice, once during install phase and another during assembly. I tried assembly:single but it throws an error. Any help to get my assemblies built without running the tests twice is much appreciated.

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  • multi row header on Google Visualizations

    - by Elzo Valugi
    Hi, I am trying to create a DataTable with a multi row header. I'll exemplify here: | 2008 | 2009 | --------------------------------------------------------- | price | qty. | price | qty | --------------------------------------------------------- | 93993 | 34434 | 34244 | 3434 | ..... The years headers can be fixed as I don't want to do sorting by that. Is there a way to do that in Google Visualizations?

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  • Java Multi threading - Avoid duplicate request processing

    - by seawaves
    I have following multi threaded environment scenario - Requests are coming to a method and I want to avoid the duplicate processing of concurrent requests coming. As multiple similar requests might be waiting for being processed in blocked state. I used hashtable to keep track of processed request, but it will create memory leaks, so how should keep track of processed request and avoid the same requests to be processed which may be in blocking state.

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  • Concatenate multi value into one record.

    - by mikehjun
    I joined two tables together and what I like to do is concatenate multi vaule in one records without duplicated value. TAXLOT_ZONE TID ZONE 1 A 1 A 1 B 1 C 2 D 2 D 2 E 3 A 3 B 4 C 5 D Desirable Final table looks like; TID ZONE 1 A, B, C 2 D, E 3 A, B 4 C 5 D

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  • Multi-key dictionaries (of another kind) in C#?

    - by Matthew Scharley
    Building on this question, is there a simple solution for having a multi-key dictionary where either key individually can be used to identify the value? ie. MultikeyDictionary<TKey1, TKey2, TValue> foo; foo.Add(key1, key2, value); myValue = foo[key1]; // value == myValue foo.Remove(key2); myValue = foo[key1]; // invalid, Exception or null returned

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  • How to black out second monitor when playing a full screen game?

    - by Gary
    I've got two monitors. When I play a full screen game in my primary monitor, the second monitor still shows the Windows desktop. How can I black out the second monitor so that it doesn't show anything at all? My graphics card is from ATI. I'm running Windows 7 in Boot Camp on an iMac. I don't know if this makes a difference, however, as any solution to my question will do, really. For instance, is there a tiny app that I could run to disable the second monitor for a while? I'd rather not have to open Windows display settings every time I run a game and disable the monitor that way, though.

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  • Use external speakers with laptop hooked to separate monitor?

    - by lhan16
    I have a laptop with a set of external speakers hooked up to it on my computer desk. The speakers use the standard 3.5mm audio (headphones) jack. The speakers work fine, but I've recently added a separate monitor to my laptop via HDMI. With the monitor hooked up to my laptop and the speakers still hooked up to the laptop, sound will only come out of the built-in monitor speakers. When I look at my audio settings, there are three different "audio playback devices" showing up, but only the built-in monitor speakers make noise when I click "test" (and I hear nothing when I set any of the other devices as the default. Does anyone know how I can still use my external speakers when using a separate monitor with my laptop? I'm hoping there is a solution that doesn't require the laptop to be open or closed, because I use both scenarios. I came across this post, but it doesn't look like they had much luck.

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  • How do I capture my second monitor using avconv?

    - by Codemonkey
    With this command: avconv -f x11grab -s 2560x1440 -i :0.0 I can stream video from my main monitor. I also have a second, 1080p monitor on which I do my gaming. I want to stream from that monitor. This doesn't work: avconv -f x11grab -s 1920x1080 -i :0.1 I assume I have to use -i :0.0 and somehow specify that it should capture 1920x1080 pixels from X position 2560 and Y position 0. My gaming monitor is placed to the right of my main monitor. Unfortunately the man page for avconv is miles long, so I haven't had any luck figuring this out on my own. I have tried Using -vf with crop like this: -vcodec libx264 ... -vf "crop=$IN_WIDTH:$IN_HEIGHT:2560:360" But that only displayed 1080p video from the top left corner of my main display.

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  • Backing up default windows installation with dd from linux running on another partition - is this fe

    - by Marek
    I am preparing to reinstall my system. I am thinking about creating a multi boot with a linux distro+Windows 7 to choose from when starting up. I would love to be able to skip all the hassle of reinstalling Windows and all programs when it starts becoming too slow in the future, thus I would like to mirror my fresh Windows system partition with some programs preinstalled. I am thinking about installing Ubuntu, making a partition for windows, installing windows with the basic environment (Visual Studio, Office, etc.) then booting into Linux and making an image of the windows partition with dd. I am not familiar with linux at all so I am a little afraid something may go wrong along the way. Is it possible to do it this way? Will I be able to partition my existing disk for multi boot easily after I install Ubuntu? Will I be able to recover the Windows partition easily using dd when I will need to re-create a fresh windows partition in the future? What other (better) approach can you recommend to achieve the goal of easy disk mirroring (for free)?

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