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  • bit manipulation in java

    - by sarav
    I have a fragment of bytes in a byte[]. The total size of the array is 4 and I want to convert this into a positive long number. For example if the byte array is having four bytes 101, 110, 10, 1 then i want to get the long number represented by binary sequence 00000000 00000000 00000000 00000000 00000101 00000110 00000010 00000001 which equals 84279809 What is the efficient way to do that in Java?

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  • Numpy ‘smart’ symmetric matrix

    - by Debilski
    Is there a smart and space-efficient symmetric matrix in numpy which automatically fills [j][i] when [i][j] is written to? a = numpy.symmetric((3, 3)) a[0][1] = 1 print a # [[0 1 0], [1 0 0], [0 0 0]] An automatic Hermitian would also be nice, although I won’t need that at the time of writing.

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  • best method to update the SQL table data from c# .NET 2005

    - by Jebli
    Hi , I have a dataset with some 30 records in it. I want to update it to the database tables. which is the best method to update the table. I am unable to use dataadapter.update() since i am using a procedure to populate the dataset. is there any efficient way to update other than iterating through EACH record and updating it Please help. Thanks.

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  • Recommended Bean Utility Libraries for Java

    - by Jim Ferrans
    I'm looking for a good, well-supported, and efficient Java library that uses reflection to automate JavaBean operations. These include making a deep copy of an arbitrary bean hierarchy (with nested lists and maps of beans), comparing two bean hierarchies for deep equality, and "transmorphing" one bean to another of a different class. Some possibilities include Apache Commons BeanUtils, Spring's BeanUtils, and Java's Bean support. Which libraries would you recommend?

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  • Convert Byte Array into Bitset

    - by Unknown
    I have a byte array generated by a random number generator. I want to put this into the STL bitset. Unfortunately, it looks like Bitset only supports the following constructors: A string of 1's and 0's like "10101011" An unsigned long. (my byte array will be longer) The only solution I can think of now is to read the byte array bit by bit and make a string of 1's and 0's. Does anyone have a more efficient solution?

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  • Pass array to client side for display

    - by Skoder
    Hey, I have an array which contains around 50-200 hyperlinks. How can I pass this array to the client-side so that I can iterate through the array and display each hyperlinks as a list item? The array will be stored in 'Application' as it's system wide and rarely changes. Could there be a more efficient way of achieving the hyperlinks as a list? Thanks

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  • PHP include once.

    - by cpburns
    Is it more efficient to use PHP's include_once or require_once instead of using c-like include with a header guard? i.e, VERSUS //contents of init.php if (!defined('MY_INIT_PHP')) { define('MY_INIT_PHP', true); ... } ?

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  • Google Appengine: Java or Python

    - by husayt
    We are going to use Google Appengine platform for our next big web project.But we are not sure which flavour to use: Java or Python. Could you please, advise on cons and pros of each approach? Which is the best way in order to build more scalable and efficient solution quicker. Thanks in advance

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  • Parser generator for inline documentation

    - by Leonth
    To have a general-purpose documentation system that can extract inline documentation of multiple languages, a parser for each language is needed. A parser generator (which actually doesn't have to be that complete or efficient) is thus needed. http://antlr.org/ is a nice parser generator that already has a number of grammars for popular languages. Are there better alternatives i.e. simpler ones that support generating parsers for even more languages out-of-the-box?

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  • Implode a Object List in .NET 2

    - by serhio
    I have(.NET2) an List<Object> objects. I want to "implode" (PHP concept) this array to CSV(obj1;obj2;obj3...) What is the most efficient way? StringBuilder, string.Join? NB. Each object implements a specific override of ToString()

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  • Android ListAdapter Repaint

    - by xger86x
    Hi, i have the following problem. I fill a ListView with a custom ArrayAdapter with data from a BD. However, in background, i'm updating those datas from the info provided by an API, so the idea is when the update finish, the adapter shows the updated data instead its "old version". The problem is that when i do that, i notice a lag while the adapter is updating itself. Is the any efficient solution to avoid this? Thanks

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  • want a good address importer

    - by Sam
    Hey Can anybody suggest me a good free open source address importer which I can use in my project? Good in the sense that, it should be easy to use and integrate (using Codeigniter framework), and also lightweight. After a long searching i’ve got one: OpenInviter. But, I don’t know how efficient it is.

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  • Lightweight JMS broker

    - by nixau
    Hi, I'm looking for a small and yet efficient enough lightweight JMS broker solution with no or minimum of dependencies. My messaging code should be running in the environment with a lot of dependencies I have no control of. Thus it would make ridiculous to deploy say ActiveMQ solution along with my custom bunch of classes. Thanks for your time.

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  • how to move a postgres schema via file operations ?

    - by Jerome WAGNER
    Hello, I have a schema schema1 in a postgres database A. I want to have a duplicate of this schema (model + data) in database B under the name schema2. What are my options ? I currently : * dump schema1 from database A * sed my way through schema renaming in the dump : schema1 becomes schema2 * restore schema2 in database B but I am looking for a more efficient procedure. For instance, via direct file operations on postgres binary files. Thanks for your help Jerome Wagner

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  • Combining List<>'s in .NET

    - by Maxim Z.
    I have a few List< objects that hold many objects of one specific type. My goal is to combine these List<'s into one List<. Of course, I could just loop through each List's contents and add them into one final List, but is there a more efficient way?

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  • Generating tuples for tuples

    - by Nicola Bonelli
    Say you have a tuple and want to generate a new tuple by applying a metafunction on each type of the first one. What' the most efficient C++ metafuntion to accomplish to this task? Is it also possible to use C++0x variadic template to provide a better implementation?

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  • dictionary interface for large data sets

    - by Richard
    I have a set of key/values (all text) that is too large to load in memory at once. I would like to interact with this data via a Python dictionary-like interface. Does such a module already exist? Reading key values should be efficient and values compressed on disk to save space.

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  • .NET Geometry Library

    - by dewald
    Does anyone know of a good (efficient, nice API, etc.) geometry open source library for .NET? Some of the operations needed: Data Structures Vectors (2D and 3D with floats and doubles) Lines (2D and 3D) Rectangles / Squares / Cubes / Boxes Spheres / Circles N-Sided Polygon Matrices (floats and doubles) Algorithms Intersection calculations Area / Volume calculations

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  • Where do you go to tickle your brain (to get programming challenges)?

    - by Prakash
    I am sure we all have some place to go to get our brain teased! Sometimes i visit Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems Where do you all go?

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  • Doctrine2 update both sides of association

    - by orourkedd
    I'm using this to update both sides of an association but want to know if there is a more efficient way to do this. In this case, it is a self-referencing OneToMany parent/child association: public function setParent(Node $parent, $inverse = true) { $this->parent = $parent; if($inverse) $parent->addChild($this, false); } public function addChild(Node $child, $inverse = true) { if(!$this->children->contains($child)) { $this->children[] = $child; if($inverse) $child->setParent($this, false); } }

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  • Remove identical files in UNIX

    - by Thrawn
    Hi all, I'm dealing with a large amount (30,000) files of about 10MB in size. Some of them (I estimate 2%) are actually duplicated, and I need to keep only a copy for every duplicated pair (or triplet). Would you suggest me an efficient way to do that? I'm working on unix. Thank you :-)

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  • YAML, JSON, or XML to store items in a document database

    - by Zubair
    I am creating a document database and I have to decide on a structure for the records which will be represented as strings. The database has to be able to be read from and written to using as many languages as possible using stable libraries in an efficient way. What are the relavant issues I have to consider, and what would you suggest is the ideal format?

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