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  • Fast matrix transposition in Python

    - by psihodelia
    Is there any fast method to make a transposition of a rectangular 2D matrix in Python (non-involving any library import).? Say, if I have an array X=[[1,2,3], [4,5,6]] I need an array Y which should be a transposed version of X, so Y=[[1,4],[2,5],[3,6]].

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  • what is difference between JDK 1.4 and JDK1.6.

    - by Vipin Nemade
    hi friend, I have created the project using the JDK 1.4. Now I want to use JDK 1.6 version in my project. for this what steps are required.Means I want to know the what changes is require in code to get a JDK 1.6 feature.Basically I am talking about the features that is added in JDK 1.6. If any one list out that changes it is very helpful. Thanks in advance..............................

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  • PHP system returns 4

    - by tomk94
    Hello everybody, I want to convert a pdf file to an image with PHP, but i can't get the command worked. PHP returns a 4. I don't have any kind of idea what that can be. I am using the next code: $tmp = system("convert -version", $value); var_dump($value); Someone an idea?

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  • Java ME 3.0 SDK on Linux?

    - by Confused
    Is it possible to develop java me applications on linux? It appears that there is no linux version of the sdk. Otherwise what would you suggest as a good language to develop mobile applications?

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  • C++ variable alias - what's that exactly, and why is it better to turn if off?

    - by Poni
    I've read the essay Surviving the Release Version. Under the "Aliasing bugs" clause it says: You can get tighter code if you tell the compiler that it can assume no aliasing.... I've also read Aliasing (computing). What exactly is a variable alias? I understand it means using a pointer to a variable is an alias, but, how/why does it affect badly, or in other words - why telling the compiler that it can assume no aliasing would get me a "tighter code"

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  • How to find an specific key/value (property list)

    - by Bob Rivers
    Hi, I'm learning cocoa/objective-c. Right now I'm dealing with key/value coding. After reading Aaron's book and other sources, I thought that I was able to left the simple examples and try a complex one... I'm trying read iTunes property list (iTunes Music Library.xml). I would like to retrieve the tracks held by an specific playlist. Probably everybody knows it, but bellow I put a piece of the xml: <plist version="1.0"> <dict> <key>Major Version</key><integer>1</integer> ... <key>Playlists</key> <array> <dict> <key>Name</key><string>Library</string> ... <key>Playlist Items</key> <array> <dict> <key>Track ID</key><integer>10281</integer> </dict> ... </array> </dict> <dict> ... </dict> </array> </dict> </plist> As you can see, the playlists are stored as dictionaries inside an array, and the key that identifies it is inside it, not as a <key> preceding it. The problem is that I'm not able to figure out how to search for a key that is inside another one. With the following code I can find the the array in which the playlists are stored, but how to find an specific <dict>? NSDictionary *rootDict = [[NSDictionary alloc] initWithContentsOfFile:file]; NSArray *playlists = [rootDict objectForKey:@"Playlists"]; Here at Stackoverflow I found this post, but I'm not sure if iterate over the array and test it is a good idea. I'm quite sure that I could use valueForKeyPath, but I'm unable to figure out how to do it. Any help is welcome. TIA, Bob

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  • VS2010 has been released, so what do you hate or love about it?

    - by csharptest.net
    I recently installed the release version of Visual Studio 2010. So far I'm less than impressed with the rewrite and was wondering if I'm the only one. The thing I dislike the most is the inability to use the old-school MDI windows instead of the dreaded tabbed documents. For the other side the usage generator seems like it may prove useful in time. So what do you like or dislike about the changes to VS2010?

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  • In .NET Xml Serialization, is it possible to serialize a class with an enum property with different

    - by Lasse V. Karlsen
    I have a class, containing a list property, where the list contains objects that has an enum property. When I serialize this, it looks like this: <?xml version="1.0" encoding="ibm850"?> <test> <events> <test-event type="changing" /> <test-event type="changed" /> </events> </test> Is it possible, through attributes, or similar, to get the Xml to look like this? <?xml version="1.0" encoding="ibm850"?> <test> <events> <changing /> <changed /> </events> </test> Basically, use the property value of the enum as a way to determine the tag-name? Is using a class hierarchy (ie. creating subclasses instead of using the property value) the only way? Edit: After testing, it seems even a class-hierarchy won't actually work. If there is a way to structure the classes to get the output I want, even with sub-classes, that is also an acceptable answer. Here's a sample program that will output the above Xml (remember to hit Ctrl+F5 to run in Visual Studio, otherwise the program window will close immediately): using System; using System.Collections.Generic; using System.Xml.Serialization; namespace ConsoleApplication18 { public enum TestEventTypes { [XmlEnum("changing")] Changing, [XmlEnum("changed")] Changed } [XmlType("test-event")] public class TestEvent { [XmlAttribute("type")] public TestEventTypes Type { get; set; } } [XmlType("test")] public class Test { private List<TestEvent> _Events = new List<TestEvent>(); [XmlArray("events")] public List<TestEvent> Events { get { return _Events; } } } class Program { static void Main(string[] args) { Test test = new Test(); test.Events.Add(new TestEvent { Type = TestEventTypes.Changing }); test.Events.Add(new TestEvent { Type = TestEventTypes.Changed }); XmlSerializer serializer = new XmlSerializer(typeof(Test)); XmlSerializerNamespaces ns = new XmlSerializerNamespaces(); ns.Add("", ""); serializer.Serialize(Console.Out, test, ns); } } }

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  • File Uploading inWeb pages

    - by Jibu P C_Adoor
    Hii, Any one knows how to upload files to the physical location of the server. It is possible using file upload control that i know. But i want to avoid the external postbacking of the page. For e.g exactly like what in the yahoo mail did. In yahoo mail latest version if you attach a file that won't post back and attach that file in to server. What is the technology behind that?

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  • Using RE to retrive an ID

    - by chrissygormley
    Hello, I am trying to use RE to match a changing ID and extract it. I am having some bother getting it working. The String is: m = 'Some Text That exists version 1.0.41.476 Fri Jun 4 16:50:56 EDT 2010' The code I have tried so far is: r = re.compile(r'(s*\s*)(\S+)') m = m.match(r) Can anyone help extract this string. Thanks

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