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  • Sparse constrained linear least-squares solver

    - by Jacob
    This great SO answer points to a good sparse solver, but I've got constraints on x (for Ax = b) such that each element in x is >=0 an <=N. The first thing which comes to mind is an QP solver for large sparse matrices. Also, A is huge (around 2e6x2e6) but very sparse with <=4 elements per row. Any ideas/recommendations? I'm looking for something like MATLAB's lsqlin but with huge sparse matrices.

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  • How does one save cookies in HTTP Builder 0.5.0/HTTPClient

    - by Misha Koshelev
    I am trying per instructions here: http://www.innovation.ch/java/HTTPClient/advanced_info.html However, if I am using HTTP Builder, the following lines System.setProperty("HTTPClient.cookies.save","true") System.setProperty("HTTPClient.cookies.jar","/home/misha/.httpclient_cookies") do not seem to create a file: ~/.httpclient_cookies I will post a solution as always when figure it out. :) Misha

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  • Programming Related Songs

    - by Jim McKeeth
    One song per answer please! We have discussed music you listen to while coding, but I looking for music related to coding and coders. It can be eclectic or mainstream, and even a bit of a stretch (just explain the connection). Vote for your favorite song or add it if it isn't already here. Link to lyrics, band, music, video, etc., when possible.

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  • Does SharpSVN have an API to manage repository permissions

    - by Troy Hunt
    Does anyone know if there is any API exposed to manage repository permissions within SharpSVN? For example, programatically adding read and write permissions on a per repository basis. Alternatively, any other thoughts on managing permissions with other SVN APIs? Worst case wil be manually managing the contents of svnaccessfile but this is a last resort. Thanks.

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  • DirectX Sphere Texture Coordinates

    - by Rushyo
    I have a sphere with per-vertex normals and I'm trying to derive the texture coordinates for the object using the algorithm: U = Asin(Norm.X) / PI + 0.5 V = Asin(Norm.Y) / PI + 0.5 With a polka dot texture, I get: Here's the same object without the texture applied: The issue I'm particuarly looking at (I know there's a few) is the misalignment of the textures. I am inclined to believe the issue resides in my use of those algorithms, as the specular highlighting (which doesn't utilise any textures but does rely on the normals being correct) appears to have no artifacts. Any ideas?

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  • CSharp: Testing a Generic Class

    - by Jonas Gorauskas
    More than a question, per se, this is an attempt to compare notes with other people. I wrote a generic History class that emulates the functionality of a browser's history. I am trying to wrap my head around how far to go when writing unit tests for it. I am using NUnit. Please share your testing approaches below. The full code for the History class is here (http://pastebin.com/ZGKK2V84).

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  • VS2010 Load Testing - Restricting ports

    - by marks-s
    As per the trouble shooting guide for VS2010 Load Testing (http://social.msdn.microsoft.com/Forums/en/vststest/thread/df043823-ffcf-46a4-9e47-1c4b8854ca13), I'm trying to restrict the range of ports used for client-controller communication. HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\VisualStudio\10.0\EnterpriseTools\QualityTools\ListenPortRange\PortRangeStart HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\VisualStudio\10.0\EnterpriseTools\QualityTools\ListenPortRange\PortRangeEnd I've set these keys on the client as described but according to netstat the client is still listening on random ports. The controller is attempting to communicate on the same random ports as the client. Anyone experienced the same?

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  • How thread-safe is enum in java?

    - by portoalet
    Hi, How thread-safe is enum in java? I am implementing a Singleton using enum (as per Bloch's Effective Java), should I worry at all about thread safety for my singleton enum? Is there a way to prove or disprove that it is thread safe? // Enum singleton - the preferred approach public enum Elvis { INSTANCE; public void leaveTheBuilding() { ... } } Thanks

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  • Most useful free Java libraries?

    - by Pyrolistical
    I've never seen a good list of free Java libraries. What are some of your can't-live-without Java libraries? Note: to keep this poll as useful as possible, please remember: Post only one library per answer We don't want duplicate answers, so before posting check if the library has been mentioned already When adding a new library, provide a short summary of what it does / why you think it's useful

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  • Web Hosting Plan

    - by Laith J
    I'm looking for a new web hosting service, currently I'm using GoDaddy's Economy plan but it offers only PHP server-side scripting. For my next project it looks like I'm gonna need to use Java. Currently I pay ~60 USD per year for both the domain and the web hosting plan. Anyone knows of a web hosting service that supports Java and isn't much more expensive than this? Thanks, God bless

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  • MIPS Assembler Instruction parameters

    - by Martin K.
    Hi, why does such a instruction as mul $t1, $v0 , 4 evaluates as expected. But mul $t1, 4 , $v0 results in a syntax error! I wonder why the first one works, because mul only works with registers per default, so I expect that only a solution like this will be workin li $t1, 4 # set $t1 = 4 mul $t1, $v0 , $t1 # set $t1 = 4 * n I'm using the SPIM simulator.

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  • Data aggregation mongodb vs mysql

    - by Dimitris Stefanidis
    I am currently researching on a backend to use for a project with demanding data aggregation requirements. The main project requirements are the following. Store millions of records for each user. Users might have more than 1 million entries per year so even with 100 users we are talking about 100 million entries per year. Data aggregation on those entries must be performed on the fly. The users need to be able to filter on the entries by a ton of available filters and then present summaries (totals , averages e.t.c) and graphs on the results. Obviously I cannot precalculate any of the aggregation results because the filter combinations (and thus the result sets) are huge. Users are going to have access on their own data only but it would be nice if anonymous stats could be calculated for all the data. The data is going to be most of the time in batch. e.g the user will upload the data every day and it could like 3000 records. In some later version there could be automated programs that upload every few minutes in smaller batches of 100 items for example. I made a simple test of creating a table with 1 million rows and performing a simple sum of 1 column both in mongodb and in mysql and the performance difference was huge. I do not remember the exact numbers but it was something like mysql = 200ms , mongodb = 20 sec. I have also made the test with couchdb and had much worse results. What seems promising speed wise is cassandra which I was very enthusiastic about when I first discovered it. However the documentation is scarce and I haven't found any solid examples on how to perform sums and other aggregate functions on the data. Is that possible ? As it seems from my test (Maybe I have done something wrong) with the current performance its impossible to use mongodb for such a project although the automated sharding functionality seems like a perfect fit for it. Does anybody have experience with data aggregation in mongodb or have any insights that might be of help for the implementation of the project ? Thanks, Dimitris

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  • D3.js transition callback on frame

    - by brenjt
    Does anyone know how I could accomplish a per frame callback for a transition with D3. Here is and example of what I am doing currently. link.transition() .duration(duration) .attr("d", diagonal) .each("end",function(e) { if(e.target.id == current) show_tooltip(e.target) }); This currently calls the anonymous function for each element at the end of the animation. I would like to call it for every frame.

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  • trace an asp.net website in production

    - by uno
    Is there a way that I can trace every method, basically a line trace, in an asp.net web site in production environment? I don't want to go about creating db logging for every line - i see an intermittent error and would like to see every line called and performed by the website per user.

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  • Can you find a pattern to sync files knowing only dates and filenames?

    - by Robert MacLean
    Imagine if you will a operating system that had the following methods for files Create File: Creates (writes) a new file to disk. Calling this if a file exists causes a fault. Update File: Updates an existing file. Call this if a file doesn't exist causes a fault. Read File: Reads data from a file. Enumerate files: Gets all files in a folder. Files themselves in this operating system only have the following meta data: Created Time: The original date and time the file was created, by the Create File method. Modified Time: The date and time the file was last modified by the Update File method. If the file has never been modified, this will equal the Create Time. You have been given the task of writing an application which will sync the files between two directories (lets call them bill and ted) on a machine. However it is not that simple, the client has required that The application never faults (see methods above). That while the application is running the users can add and update files and those will be sync'd next time the application runs. Files can be added to either the ted or bill directories. File names cannot be altered. The application will perform one sync per time it is run. The application must be almost entirely in memory, in other words you cannot create a log of filenames and write that to disk and then check that the next time. The exception to point 6 is that you can store date and times between runs. Each date/time is associated with a key labeled A through J (so you have 10 to use) so you can compare keys between runs. There is no way to catch exceptions in the application. Answer will be accepted based on the following conditions: First answer to meet all requirements will be accepted. If there is no way to meet all requirements, the answer which ensures the smallest amount of missed changes per sync will be accepted. A bounty will be created (100 points) as soon as possible for the prize. The winner will be selected one day before the bounty ends. Please ask questions in the comments and I will gladly update and refine the question on those.

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  • Impact of Multiple .ToUpper()'ing

    - by Kyle Rozendo
    Hi All, This is not a question of premature optimization per se. On the garbage collector and memory in general, what would hundreds of ToUpper() operations (many could be duplicated) do to a program, mainly in regard to the immutability of strings? Thanks, Kyle

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  • Favorite Drupal tips or best practices?

    - by Mike Crittenden
    Just wondering what tips or tricks you guys might have to share. As always with posts like this, please only one tip per post so they can be voted on independently. I'll start: however you do your theming, you can use the mothership theme as a base theme for your theme to inherit from so that your markup will be a lot cleaner and less verbose.

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