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• How do you classify languages into regular, context free, and phrase-structure?

  - by confused

  If you're given a language, how do you figure out if it's regular, CF but not regular, or phrase-structure but not CF? Is there a good way to attack this problem? I could randomly try to make FAs or PDAs, but I feel like there's a better way to do it. Classic example: L = { a^n b^n c^n | n = 0 } Where would one start? Thanks.

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• How does Apple update the Airport menu while it is open? (How to change NSMenu when it is already op

  - by Tegeril

  I've got a statusbar item that pops open an NSMenu, and I have a delegate set and it's hooked up correctly (-(void)menuNeedsUpdate:(NSMenu *)menu works fine). That said, that method is setup to be called before the menu is displayed, I need to listen for that and trigger an asynchronous request, later updating the menu while it is open, and I can't figure out how that's supposed to be done. Thanks :)

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• Sorting Listbox in Silverlight (Sketchflow)

  - by gnitez

  I have a Listbox with multiple columns and bound to a data source (XML) as shown below. <ListBox x:Name="lstBox1" Background="#FFC5EFFD" Margin="7,50,10,15" ItemTemplate="{StaticResource ItemsPanelTemplate1}" ItemsSource="{Binding BPICollection}" BorderThickness="0"/> I'm trying to figure out how to sort a particular column in the listbox.

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• strcasecmp in C returns 156 instead of 0, any ideas why?

  - by hora

  I have the following code: printf("num: %d\n", strcasecmp(buf, "h\n")); And I get the following results when I try plugging in different letters: a: -7 g: -1 i: 1 j: 2 h: 156 H: 156 Should strcasecmp not return 0 when buf is equal to H or h? Any ideas why it's returning 156? I need to figure out how to check whether the user types H or h. Thanks!

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• Error: Class 'Haml' not found... trying to use Haml (Kohaml) with Kohana

  - by Serhiy

  Can't for the life of me figure out what I'm doing wrong... Downloaded Kohaml from http://github.com/transphorm/kohaml Dropped it into modules/kohaml # My Bootstrap reference 'kohaml' => MODPATH.'kohaml', // kohaml Keep getting this error... (snapshot of the error and my modules folder) http://wellcommentedcode.com/stack_kohaml_question/ Any suggestions on what I might be doing wrong would be highly appreciated... thanks.

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• Determining a transaction fee before an order is processed

  - by Kenji Crosland

  When users make credit card transactions on my web app, I'd like to include the transaction fee on the confirmation page before the user makes the order. The thing is, there are different transaction fees for different cards. Is there a way to determine a transaction fee from the card number? I'm using Rails and ActiveMerchant, but I figure this question was applicable to other languages as well.

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• How do I get the scalaz IDEA live templates working for the symbolic methods?

  - by oxbow_lakes

  Many of the methods in scalaz have symbolic equivalents, such as forever and 8 (of course, I have this the wrong way round, the symbolic methods really have ASCII equivalents). The project contains a live templates XML file for IDEA so these can be auto-completed, I believe by using the forever+TAB shortcut (in the above instance). I can't figure out how to import this live template into IDEA and actually use it, though. How can I do that?

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• How do I display breadcrumbs on "Products tagged with" pages in Magento?

  - by Dustin

  I can't figure out how to get breadcrumbs to show up on the "Products tagged with" page in Magento. I get breadcrumbs everywhere else, including the search results page. Any help would be greatly appreciated.

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• An interview question on conditional operator

  - by nthrgeek

  I recently encountered with this question: How to reduce this expression: s73?61:60;. The hint given was that Instead of using conditional operator we could use a simple comparison which will work fine. I am not sure but I think it is possible with some GCC extension,although I am unable to figure it out myself. EDIT:The whole expression is this : s-=s73?61:60

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• How could I make geometry advanced operations on bezier paths?

  - by yizzreel

  I have a library that draws regular bezier path figures (complex paths formed of a lot of bezier points), using midpoint approximation. I can draw them without problem, but I need to add support for advanced geometry operations: Nearest point of a curve, intersection, figure contains point, and more importantly, path combinations: difference, intersection, exclusive-or, union, ... Is there any good source to get all this? Thanks

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• C#, Display plain text in a form

  - by daemonfire300

  I ve made this simple drawing to explain my needs: Plain Text in C# I can only find rather "complex" functions, like RTF Text box etc. I couldn't figure out how to display "plain text" in a Form1.cs (I do not talk about HTML to WinForm) (Search did not return any useful results)

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• How can I erase the old data from logcat?

  - by DJTripleThreat

  when I run the command adb logcat while running the android emulator, all of the old logs blow past and so I figure they are stored in a file somewhere. Is there a command I can run to clear the logs and start fresh? If not, is there some other way to do this?

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• Get CGI Fields from URL Python

  - by user299196

  When using the cgi module in Python, I can't seem to figure out how to extract CGI variables in the URL. For example if the url servercgi.py?name=user , how do I get 'name' after import cgi? For some reason, form.getvalue and form['user'] do not work but if I print the object, I see something like FieldStorage(None, None, [MiniFieldStoreage('name', 'user')]).

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• Using HTTP Pipelining with Jetty HTTPClient

  - by jrogi

  I'm trying to figure out how to use HTTPClient (org.eclipse.jetty.client.HttpClient) so it will pipeline HTTP Request. I've tried to create some HttpExchange instances and applying the send() method for each, in an asynchronous mode, but each HTTP request has waited for it response before the next request was sent. Can you please supply a code snippet for this case?

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• How do I get spring-ws + tomcat to log errors

  - by Dave

  I'm creating a Spring-WS based webservice and running it in tomcat. I made some change and now get a fault with OperationUnsupportedException. I'd like to see the entire stack trace that Spring-WS is getting, but cannot figure out how to have it logged. Does anybody know how to have this stack trace logged somewhere?

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• Overriding previously set float using javascript in ie

  - by wheresrhys

  I've read this question to figure out how to set float:none on an element which already has float:right set with class. I used element.style.cssFloat = "none", but this just added a new style property cssFloat which didn't over-ride the existing float:right. I've now fixed it using the adding/removing classes method. But is there a way of over-riding existing float rules in ie without having to use classes?

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• Apache Rewrite - put parts of query string in replacement string

  - by Rangi Robinson

  Hello, I'd like to rewrite: www.example.com/file.html?username=john&number=1234 To: www.example.com/users/john But I can't figure out how to extract the "username" value from the query string. I've been Googling this all morning and reading the official docs but no luck. I need to solve this problem with a rewrite, rather than changing the application. Any help much appreciated! Rangi

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• Why should I Use ASP.NET Membership security model?

  - by ListenToRick

  I'm updating my website at the moment and figure that if I am to update my login/security mode, now is a good time. I have looked through the Membership model which is included in ASP.NET but I'm convinced that it will provide any benefit apart from being familiar to other .NET deevlopers. There seems to be quite a lot of documentation for it, but little discussion for why its worth the effort. Can anybody shed some light upon this?

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• Registering a Named Function as a Listener with Jquery

  - by Marcus

  I'm new to javascript/jquery and I've done some poking around the web, but I can't figure out why the following is invalid: var toggleSection = function(sectionName) { // Do some Jquery work to toggle stuff based on sectionName string // (concatenate sectionName with other text to form selectors) }; $('#togglecont1').click(toggleSection("container1")); Is there something obvious I'm missing? Thanks in advance.

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• determine pid of terminated process

  - by Hristo

  I'm trying to figure out what the pid is of a process that sent the SIGCHLD signal, and I want to do this in a signal handler I created for SIGCHLD. How would I do this? I'm trying: int pid = waitpid(-1, NULL, WNOHANG); .. because I want to wait for any child process that is spawned. Thanks, Hristo

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• Git pull cygwin not a git-command

  - by jagguli

  Hi I just installed git cygwin on my windows pc at work, but somehow git pull doesn't seems to be working. the out put is : git: 'pull' is not a git-command. See 'git --help'. Did you mean this? pull Cant seem to figure this one out, this works fine using the msysgit version.

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• Big O, how do you calculate/approximate it?

  - by Sven

  Most people with a degree in CS will certainly know what Big O stands for. It helps us to measure how (in)efficient an algorithm really is and if you know in what category the problem you are trying to solve lays in you can figure out if it is still possible to squeeze out that little extra performance.* But I'm curious, how do you calculate or approximate the complexity of your algorithms? *: but as they say, don't overdo it, premature optimization is the root of all evil, and optimization without a justified cause should deserve that name as well.

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• Javascript Event Bubbling Not Working As Expected

  - by Dean Bayley

  Hi Guys, Having a nightmare trying to figure out event Bubbling.. Example here: link text From what i understand clicking in the area inside the red border should trigger all 3 event handlers (red, blue & body), only red and body are triggered.. I have tried altering the third value of addEventListener and changing the return values but to no avail, any ideas? D.

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• How to wrap Java String.format()?

  - by BlinK_

  Hey everyone, I would like to wrap the String.format() method with in my own Logger class. I can't figure a way how to pass arguments from my method to String.format(). public class Logger { public static void format(String format, Object... args) { print(String.format(format, args)); // <-- this gives an error obviously. } public static void print(String s) { System.out.println(s); } }

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• NHibernate Query

  - by Nathan Roe

  Is it possible to get NHibernate to generate a query similar to the following with HQL or Criteria API? select * from ( select row_number() over ( partition by Column1 order by Column2 ) as RowNumber, T.* from MyTable T ) where RowNumber = 1 I can get it to execute the inner select using the formula attribute, but I can't figure out a way to write a HQL or Criteria query that lets me wrap the inner select in the outer one.

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