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• What methods are used to visualize a 4-dimensional Array?

  - by Atomiton

  An Array ( a row of elements ): [ ][ ][ ][ ][ ][ ] A 2-D Array ( a table ): [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ][ ] A 3-D Array: //Imagine the above table as a cube ( a table with depth ) How does one visualize a 4-D array? The closest I can come is multiple cubes, so for int[,,,] [5,10,2,7] would be…

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• what is the algorithm used to generate those little gravatar identicon images?

  - by dreftymac

  Naturally, one would suspect that the algorithm creates images that are: highly unlikely to produce the same identicon twice; and capable of ensuring that each identicon is sufficiently distinctive as to not appear too similar to any other identicon

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• Can Core Data be used for objects with variable schemas?

  - by glenc

  I'm implementing a new iPhone app and am relatively new to Cocoa development overall. I am at the stage of choosing how the persistence layer of this app will work, and it looks like I'm basically choosing between Core Data and sqlite3. The persisted models in this app are intended to have a schema that is loaded at runtime (from some kind of…

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• Have you used Intersystems Caché in any project? What is your experience?

  - by user49767

  What is Intersystem's Caché product? is it RDBMS or Caché server? Could you also write brief notes about the use-case in your project?

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• Which method should be used ideally - document.getElementById or document.forms[]?

  - by naveen

  Hi Guys, I would like to know which of the following method is better? document.getElementById or documennt.forms[]? Regards, Naveen

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• Are evolutionary algorithms and neural networks used in the same problem domains?

  - by Joe Holloway

  I am trying to get a feel for the difference between the various classes of machine-learning algorithms. I understand that the implementations of evolutionary algorithms are quite different from the implementations of neural networks. However, they both seem to be geared at determining a correlation between inputs and outputs from a…

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• How to solve the problem of not being informed of successful payments by the 3rd party system used b

  - by user68759

  I have a subscription based website that interacts with a 3rd party system to handle the payments. The steps to process a new subscriber registration are as follow: The subscriber enters his/her details in the subscription form and click on the submit button. Assuming the details specified are valid, a new record is created in the…

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• Rails: Accessing the username/password used for HTTP Basic Auth?

  - by Shpigford

  I'm building a basic API where user information can be retrieved after that user's login and password are correctly sent. Right now I'm using something like this: http://foo:bar@example.com/api/user.xml So, what I need to do is access the user/password sent in the request (the foo and bar) but am not sure how to access that info…

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• MySQL is returning an "column ambiguous" error when it used to work before I upgraded...

  - by Ronedog

  I recently upgraded MySQL to 5.1.41. Before the upgrade the following SQL worked (or at least I thought I remembered it working...it has been a few weeks since designing this...). Now the SQL gives me an error stating that the "archived" column is ambiguous. How can I write this differently, or is there a different problem I'm…

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• Does Perl auto-vivify variables used as references in subroutine calls?

  - by FM

  I've declared 2010 to be the year of higher-order programming, so I'm learning Haskell. The introduction has a slick quick-sort demo, and I thought, "Hey, that's easy to do in Perl". It turned to be easier than I expected. Note that I don't have to worry about whether my partitions ($less and $more) are defined. Normally you…

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• Does set affinity ensure that only one core resources are used?

  - by Kailash

  Hello, I just wanted to find out if setting cpu affinity ensure that the application runs only on that core ?

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• Can one TabBarItem be used for two different ViewControllers?

  - by Kash

  I am creating an app with three tabBarItems, but I want to control four ViewControlers with three tabBars. I am trying to use one tabBar for two different viewcontrollers. I am able to change the tabBartitle and icon upon tap, but I cannot reset it so it can go back to it's previous status with previous title and icon. Also,…

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• Chrome is leaking memory, when jQuery is used on events?

  - by user269386

  Hi, I'm experiencing an increase of memory usage, when I use the jQuery-eventhandling in Chrome. I've tested it with IE and FF as well, but there I couldn't see a suspicious rise of memory-usage, compared to Chrome. I'm using Chrome version 4.0.223.16 (unfortunately I'm forced to use this version, here) Simple example…

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• RecursiveIterator: used to explode tree structure, or only flatten?

  - by Stephen J. Fuhry

  There are tons of examples of using the RecursiveIterator to flatten a tree structure.. but what about using it to explode a tree structure? Is there an elegant way to use this, or some other SPL library to recursively build a tree (read: turn a flat array into array of arbitrary depth) given a table like this: SELECT…

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• Why is it bad to use boolean flags in databases? And what should be used instead?

  - by David Chanin

  I've been reading through some of guides on database optimization and best practices and a lot of them suggest not using boolean flags at all in the DB schema (ex http://forge.mysql.com/wiki/Top10SQLPerformanceTips). However, they never provide any reason as to why this is bad. Is it a peformance issue? is it hard to…

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• Updating a local sqlite db that is used for local metadata & caching from an service?

  - by Pharaun

  I've searched through the site and haven't found a question/answer that quite answer my question, the closest one I found was: Syncing objects between two disparate systems best approach. Anyway to begun, because there is no RSS feeds available, I'm screen scrapping a webpage, hence it does a fetch then it goes…

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• Should mutexes be used to ensure concurrency, while using POSIX message queues?

  - by Vinod K

  I am using a single POSIX message queue in my application which is accessed by multiple readers. Should I use mutexes in this scenario?

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• On a VPS that runs DB and IIS, should I limit the RAM used by MS SQL Server?

  - by Donald Hughes

  I have a Windows 2008 R2 VPS with 1 GB of RAM. I'm using the VPS to run MS SQL Server 2008 Express and IIS 7.5. I've noticed that SQL Server tends to use as much memory as it can, to the detriment of other applications (and this makes sense with a server is dedicated to running SQL Server). Should I set a…

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• Is UTC or local time used with time-based notifications?

  - by Johann Gerell

  I have a time in the future when I want a notification to occur and need to know if ::CeSetUserNotificationEx expects UTC or local time in the stStartTime field of the CE_NOTIFICATION_TRIGGER structure if the dwType field is set to CNT_TIME?

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• Why JavaScript dialogs (alert/prompt/confirm) are not widely used and not under active development?

  - by serg555

  If there is a need to display some simple confirmation popup, most developers would rather install jQuery, find some dialog plugin for it, skin it, than put a one liner: if(confirm("Are you sure?")) { ... } Using alert() for displaying error messages is considered cheap. And how many sites can you name…

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• In CakePHP, whats the best Image Upload / Resizing component you've used?

  - by Smickie

  Im looking for somthing that can belong to many many models and, hopfully, has all the resizing functionality built in too. Wondering if there's any good suggestions out there, I don't want to pick the wrong one. Or is it just worth building my own?

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• Can a .csv file be used as a data source in Visual Studio 2008?

  - by Kevin

  I'm pretty new to C# and Visual Studio. I'm writing a small program that will read a .csv file and then write the records read to a SQL Server database table. I can manually parse the .csv file, but I was wondering if it is possible to somehow "describe" the .csv file to Visual Studio so that I can use…

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• If I specify a System property multiple times when invoking JVM which value is used?

  - by RobV

  If I specify a system property multiple times when invoking the JVM which value will I actually get when I retrieve the property? e.g. java -Dprop=A -Dprop=B -jar my.jar What will be the result when I call System.getProperty("prop");? The Java documentation on this does not really tell me anything…

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• Python del() built-in can't be used in assignment?

  - by emcee

  I noticed a problem when I was trying to use del in a lambda to thin out a list of threads to just those running: map(lambda x: del(x) if not x.isAlive() else x, self.threads) Ignore for a second that this doesn't do anything, I'm just fooling around with map, reduce, and lambda. This fails with a…

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• I am unable to get the selected menuItem from <f:setPropertyActionListener. I have used binding for

  - by anandhinaveen

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