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  • Calculating the square of BigInteger

    - by brickner
    Hi, I'm using .NET 4's System.Numerics.BigInteger structure. I need to calculate the square (x^2) of very large numbers. If x is a BigInteger, What is the time complexity of: x*x; or BigInteger.Pow(x,2); ? If it's worse than O(n^2), do you have a better implementation? Maybe something like Schönhage–Strassen algorithm?

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  • Django - testing using large tables of static data

    - by Michael B
    I am using "manage.py test" along with a JSON fixture I created using using 'dumpdata' My problem is that several of the tables in the fixture are very large (for example one containing the names of all cities in the US) which makes running a test incredibly slow. Seeing as several of these tables are never modified by the program (eg - the city names will never need to be modified), it doesn't make much sense to create and tear down these tables for every test run. Is there a better way to be testing this code using this kind of data?

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  • How to implement wordwrap on jqGrid which works on IE7, IE8 and FF

    - by Brandon
    How to implement wordwrap on jqGrid which works on IE7, IE8 and FF, while also having column-resize work (grid aligns correctly). Tried to innerwrap content on each td with a div of specific width (based on initial TH width), but colresize will not work on the divs I've inserted. jqGrid calculates the widths of the resized TH and adjacent THs though. Is there a better solution which will avoid all the JavaScript 'hacks'?

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  • Parsing a string using a delimiter to a TStringList, seems to also parse on spaces (Delphi)

    - by Daisetsu
    I have a simple string which is delimited by some character, let's say a comma. I should be able to create a TStringList and set it's delimiter to a comma then set the DelimitedText to the text I want to parse and it should be automaticlly parsed. The problem is when I look at the output it also includes spaces as delimiters and chops up my results. How can I avoid this, or is there a better way to do this.

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  • Django filter vs exclude

    - by Enrico
    Is there a difference between filter and exclude in django? If I have self.get_query_set().filter(modelField=x) and I want to add another criteria, is there a meaningful difference between to following two lines of code? self.get_query_set().filter(user__isnull=False, modelField=x) self.get_query_set().filter(modelField=x).exclude(user__isnull=True) is one considered better practice or are they the same in both function and performance?

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  • One CSS per page in ASP.NET Theme

    - by Eduardo
    Does anybody know how to do this? Theme A style_for_x.aspx.css style_for_y.aspx.css Theme B style_for_x.aspx.css style_for_y.aspx.css Or even better: Theme A style_for_all_pages.css style_for_x.aspx.css style_for_y.aspx.css Theme B style_for_all_pages.css style_for_x.aspx.css style_for_y.aspx.css

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  • run a function every x seconds in c++

    - by wyatt
    I'm trying to build a feed reader in C++, so I need the program to check for new feeds intermittently. However, the user needs still to be able to interact with the program, so the suggestion that I seem to keep finding, to have the system wait, doesn't work for me. Can anyone suggest a better solution, say a timer that runs in the background or something? Thanks, Charles

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  • Learning C bit manipulation

    - by VaioIsBorn
    I didn't know any better name for a title of the question. For ex: on one of my previous questions one answered ((a)-(b))&0x80000000) 31 - this is kind of a too advanced for me and i can't really get what it means. I am not looking just for an answer of that, but i need someone to tell me some books/sites/whatever where i can learn this cool "advanced" tricks in C - and learn how and where to use them respectively too.

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  • Multiple Git repositories in one directory

    - by Jakob
    Hello, I would like to deploy a directory to multiple developers having different permissions. So this is one thing Git cannot do. What about creating two repositories in one directory and assigning them different file lists by excluding files managed by the other repository with the .gitignore file. Example: /www/project/.git for all files execpt in /www/project/css /www/project/css/.git - only files in this directory Has anyone tried this solution? Or are there any better ways to handle this issue? Regards, Jakob

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  • Histogram equalisation of colour images with Java

    - by Tunji Gbadamosi
    I'm trying to histogram equalise a colour image with Java. At first I thought about applying the greyscale method to each RGB value, however, I've since learned that this would disrupt the colour distribution of the image. So, my question is: which is a better way to histogram equalise a colour image with Java?

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  • Implementing database redundancy with sharded tables

    - by ensnare
    We're looking to implement load balancing by horizontally sharding our tables across a cluster of servers. What are some options to implement live redundancy should a server fail? Would it be effective to do (2) INSERTS instead of one ... one to the target shard, and another to a secondary shard which could be accessed should the primary shard not respond? Or is there a better way? Thanks.

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  • What was your most useful/inspiring computer science course?

    - by MPelletier
    I'm currently taking one course per semester, remotely, in a short 5 year program. My aim is to get better at my trade (programming and analysis, not surprisingly). However, I find that I'm not inspired by my choice of classes for next semester. Maybe I'm being too judgmental. I'd like to know what positive experience was gained from a course in particular. Have ou had a course that turned out to be an idea catalyst?

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  • POI performance

    - by The Machine
    I am using POI in my J2EE web application to generate a workbook. However, i find that POI takes around 3 mins to create a workbook with 25K rows(with around 15 columns each). Is this a POI performance issue , or is it justified to take that much of time? Are there other APIs known for better performance ?

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  • Is ther any DLL or DLL like concept in Android?

    - by Prashant
    Hello, We know that we can use a concept "Java Package" but I just wanted to know that whether Android has provided a DLL or DLL like concept where we can write a most of the functionality. Or can we use Activity for serving a purpose of DLL. Can any one tell me is there any concept like DLL on Android OS? Can we develop a DLL for better modularization and other benefits on Android? Thanks and Regards, Prashant.

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  • Converting ASP.NET web site to MVC2

    - by kapil
    I have my existing web site developed using ASP.NET. It's college management system. Now I need to redevelop it on MVC2. What all changes do I need to do? I am little bit aware of MVC and have done some exercises also. Thing I know is I can keep my database intact but there will be massive changes at other places. WHat will be the better way to minimize the changes?

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  • determine if javascript blur/focusout event is from selecting flash or leaving browser

    - by jedierikb
    In IE when I select flash, document.onfocusout is fired. When this event is fired, I would like to distinguish between selecting flash and leaving the browser. When I handle the callback, document.activeElement is the previous html element with focus (what I just left), so this is not helpful for solving this problem. Clearly there has been a change in focus to warrant calling the blur method -- is this information available somewhere? Or is there a better way to do this?

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  • How to repackage NVIDIA .run drivers into .deb with DKMS

    - by Delan Azabani
    At present, Ubuntu offers the 195.36.24 drivers as nvidia-current in their repository. This packaged driver is pretty cool as it uses DKMS so you don't have to keep reinstalling the driver after a new kernel version. The NVIDIA .run package drivers are at version 257 (beta) but they don't use DKMS so the graphics screws up every time a new kernel is installed and you don't reinstall the driver. How can I modify the .run to use DKMS and even better, package it as a deb package?

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  • Need to have either example.com/username or username.example.com, but how?

    - by Stefan
    Hey guys, I'm almost finished developing my large project, however I would love it if I could make it so instead of having the users profile pages at: http://example.com/profile/username/USERNAME (i'm currently using .htaccess to rewrite the GET data into forward slashes and profile(.php) being read as just 'profile' profile.php also parses the url correctly to retrieve the GET data) But it would be some much better if I could do it so that it's like http://www.example.com/USERNAME (preferred) or http://www.USERNAME.example.com Any ideas or resources? Thanks, Stefan

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  • Best way to get all digits from a string with regex

    - by Chris Marisic
    Is there any better way to get take a string such as "(123) 455-2344" and get "1234552344" from it than doing this: var matches = Regex.Matches(input, @"[0-9]+", RegexOptions.Compiled); return String.Join(string.Empty, matches.Cast<Match>() .Select(x => x.Value).ToArray()); Perhaps a regex pattern that can do it in a single match? I couldn't seem to create one to achieve that though.

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  • Measuring WPF Rendering Performance

    - by Wonko the Sane
    Hi All, I am looking to get some better performance on an ItemsControl, and I believe that the biggest hang-up is the rendering. The ItemTemplate of the control consists of (basically) a Border around an ImageBrush. The ItemsSource is an ObservableCollection of a custom class (of which I have no real control). What I'd like to know are some techniques for measuring (rudimentary measurements are fine to start with) the performance. This is an XP machine using .NET 3.5 SP1. Thanks, wTs

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