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• Groovy concurrency: A better way to aggregate results semantically?

  - by Stefan Kendall

  I need to call a number of methods in parallel and wait for results. Each relies on different resources, so they may return at different times. I need to wait until I receive all results or time out after a certain amount of time. I could just spawn threads with a reference to a shared object via a method call, but is there a better, more groovy way to do this?

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• What is the relaxation condition in graph theory

  - by windopal

  Hi, I'm trying to understand the main concepts of graph theory and the algorithms within it. Most algorithms seem to contain a "Relaxation Condition" I'm unsure about what this is. Could some one explain it to me please. An example of this is dijkstras algorithm, here is the pseudo-code. 1 function Dijkstra(Graph, source): 2 for each vertex v in Graph: // Initializations 3 dist[v] := infinity // Unknown distance function from source to v 4 previous[v] := undefined // Previous node in optimal path from source 5 dist[source] := 0 // Distance from source to source 6 Q := the set of all nodes in Graph // All nodes in the graph are unoptimized - thus are in Q 7 while Q is not empty: // The main loop 8 u := vertex in Q with smallest dist[] 9 if dist[u] = infinity: 10 break // all remaining vertices are inaccessible from source 11 remove u from Q 12 for each neighbor v of u: // where v has not yet been removed from Q. 13 alt := dist[u] + dist_between(u, v) 14 if alt < dist[v]: // Relax (u,v,a) 15 dist[v] := alt 16 previous[v] := u 17 return dist[] Thanks

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• Send Email in VB.Net 3.5

  - by JPJedi

  I need to send a basic email from my site when someone registers for my site. Is their an easy way? or a site to reference?

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• MSDiscoCodeGenerator failed. Initialization failure.

  - by Nimesh

  I am getting an error while updating the webservice reference. I doubt this is beacuse of the error in the machine.config file where I set up the usage of my custom SchemaImporterExtenstion. PLease let me know how can i solve this?

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• Som maps problem in matlab

  - by Serdar Demir

  I have a text file that include data. My text file: young, myopic, no, reduced, no young, myopic, no, normal, soft young, myopic, yes, reduced, no young, myopic, yes, normal, hard young, hyperopia, no, reduced, no young, hyperopia, no, normal, soft young, hyperopia, yes, reduced, no young, hyperopia, yes, normal, hard I read my text file load method %young=1 %myopic=2 %no=3 etc. load iris.txt net = newsom(1,[1 5]); [net,tr] = train(net,1); plotsomplanes(net); Error code: ??? Undefined function or method 'plotsomplanes' for input arguments of type 'network'.

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• Creating a function in ruby

  - by Micke

  Hello, i have some problem with creating a function to my Rails app. I want it to work like this: str = "string here" if str.within_range?(3..30) puts "It's withing the range!" end To do that i added this into my application helper: def within_range?(range) if self.is_a?(String) (range).include?(self.size) elsif self.is_a?(Integer) (range).include?(self) end end But i get this error: undefined method `within_range?' for &quot;&quot;:String Do you know what the problem is? and could you please help me. If there is a easier way please say so then. Thanks in advance, Micke.

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• How does Google Friend Connect accomplish cross domain communication without needing to upload a file to the client domain?

  - by mboyle

  Previously, Google's Friend Connect required users to upload a couple of files to their websites to enable cross domain communication and Facebook Connect still requires you to upload a single file to enabled it. Now, Friend Connect doesn't require any file upload... I was wondering how they were able to accomplish this. Reference: http://www.techcrunch.com/2009/10/02/easy-does-it-google-friend-connect-one-ups-facebook-connects-install-wizard/

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• Access Error when running windows program

  - by JPJedi

  I have a windows form application that uses microsoft access for the database on the backend. When I run that application I get an error that says access is not installed on the computer. I thought that if I included the reference that it will be included with what I release so the user would not have to have access installed. How do I include the Access Runtime to be distributed/installed when my application is installed?

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• WCF ChannelFactory against SOA principles?

  - by Georgia Brown

  Is sharing a project containing the wcf interface and datacontracts and using these via ChannelFactory to consume the service against SOA principles? My architect is advising that generating a proxy using Add Service Reference is preferable.

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• Regex to Match White Space or End of String

  - by Kirk

  I'm trying to find every instance of @username in comment text and replace it with a link. Here's my PHP so far: $comment = preg_replace('/@(.+?)\s/', '<a href="/users/${1}/">@${1}</a> ', $comment); The only problem is the regex is dependent upon there being whitespace after the @username reference. Can anyone help me tweak this so it will also match if it is at the end of the string?

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• LinkButton in a DataList

  - by erasmus

  I have a datalist and in its header template I have a linkbutton.In my codebehind file I wrote as I've always written: ((LinkButton)(DataList1.FindControl("LinkButton1"))).Enabled = false; but this gives me the error: Object reference not set to an instance of an object. How can I access this linkbutton?

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• Prototyping Object in Javascript breaks jQuery?

  - by blesh

  I have added a simple .js to my page that has some pretty mundane common-task sort of functions added to the Object and Array prototypes. Through trial and error I've figured out that adding any function to Object.prototype, no matter it's name or what it does causes javascript errors in jQuery: The culprit? Object.prototype.foo = function() { /*do nothing and break jQuery*/ }; The error I'm getting line 1056 of jquery-1.3.2.js, in the attr:function { } declaration: /*Object doesn't support this property or method*/ name = name.replace(/-([a-z])/ig, function(all, letter) { return letter.toUpperCase(); }); Apparently G.replace is undefined. While it's obvious that there's something I'm just not wrapping my head around with prototyping, I'm failing miserably to figure out what it is. To be clear, I'm not looking for a workaround, I have that handled... what I'm looking for is an answer to 'Why?'. Why does adding a function to Object.prototype break this bit of code?

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• insert BibTeX article *here*, not at the end of the article

  - by vy32

  I've seen this before, but I just can't find it. I am writing a resume and want to include the articles from my bibtex file. If I write \cite{FOO} then they all appear at the end. I know that there is some way to say \something{FOO} and the FOO reference appears here. Basically, I want this section of my CV to look like: \something{FOO1} \something{FOO2} What is the \something? Thanks.

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• Task queue java

  - by user268515

  Hi i'm new to Task queue concepts when i referred the guide I got struck on this line queue.add( DatastoreServiceFactory.getDatastoreService().getCurrentTransaction(), TaskOptions().url("/path/to/my/worker")); what is TaskOptions() method. Is it default method are method created manually what will TaskOptions() method will return. I created a method called TaskOption() when i to return a string value its saying error as "The method url(String) is undefined for the type String" In url what i want to specify servlet are any other. My doubt may be stupid but plz clarify it. Thank you, sharun.

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• hpricot throws exception when trying to parse url which has noscript tag

  - by anusuya

  I use hpricot gem in ruby on rails to parse a webpage and extract the meta-tag contents. But if the website has a <noscrpit> tag just after the <head> tag it throws an exception Exception: undefined method `[]' for nil:NilClass I even tried to update the gem to the latest version. but still the same. this is the sample code i use. require 'rubygems' require 'hpricot' require 'open-uri' begin index_page = Hpricot(open("http://sample.com")) puts index_page.at("/html/head/meta[@name='verification']")['content'].gsub(/\s/, "") rescue Exception => e puts "Exception: #{e}" end i was thinking to remove the noscript tag before giving the webpage to hpricot. or is there anyother way to do it??

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• MessageQueue.BeginReceive() null ref error - c#

  - by ltech

  Have a windows service that listens to a msmq. In the OnStart method is have this protected override void OnStart(string[] args) { try { _queue = new MessageQueue(_qPath);//this part works as i had logging before and afer this call //Add MSMQ Event _queue.ReceiveCompleted += new ReceiveCompletedEventHandler(queue_ReceiveCompleted);//this part works as i had logging before and afer this call _queue.BeginReceive();//This is where it is failing - get a null reference exception ; } catch(Exception ex) { EventLogger.LogEvent(EventSource, EventLogType, "OnStart" + _lineFeed + ex.InnerException.ToString() + _lineFeed + ex.Message.ToString()); } } where private MessageQueue _queue = null;

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• Password protected PDF using C#

  - by balaweblog

  I am creating a pdf document using C# code in my process. I need to protect the docuemnt with some standard password like "123456" or some account number. I need to do this without any reference dlls like pdf writer. I am generating the PDF file using SQL Reporting services reports. Is there are easiest way.

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• Are there other languages besides English that append suffixes to roman numerals?

  - by Scott Markwell

  Are there any other languages besides English or cultures, that append suffixes to Roman Numerals such as 1st or 2nd? Do other cultures/locales use the English suffixes? Reference - Wikipedia I'm including this on stackoverflow because it directly relates to localization in applications I work on.

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• MPMoviePlayerController doesn't implement MPMediaPlayback protocol as advertised?

  - by goren

  I'm trying to use the MPMediaPlayback protocol's currentPlaybackRate() to slow down a video. I'm confused though as the class MPMoviePlayerController states that: You can control most aspects of playback programmatically using the methods and properties of the MPMediaPlayback protocol, to which this class conforms. Except just above in the header here: http://developer.apple.com/iphone/library/documentation/MediaPlayer/Reference/MPMoviePlayerController_Class/MPMoviePlayerController/MPMoviePlayerController.html it doesn't seem to. All I want to do is slow down the playback rate for a video.

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• Does Scala's BigDecimal violate the equals/hashCode contract?

  - by oxbow_lakes

  As the Ordered trait demands, the equals method on Scala's BigDecimal class is consistent with the ordering. However, the hashcode is simply taken from the wrapped java.math.BigDecimal and is therefore inconsistent with equals. object DecTest { def main(args: Array[String]) { val d1 = BigDecimal("2") val d2 = BigDecimal("2.00") println(d1 == d2) //prints true println(d1.hashCode == d2.hashCode) //prints false } } I can't find any reference to this being a known issue. Am I missing something?

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• Ruby tutorial for experienced programmers

  - by Skillwired

  I'm looking for a Ruby tutorial which would be usable for Java programmers with 8+ years of experience. I don't need another tutorial which explains basic programing/OOP/OOD concepts (inheritance, polymorphism, encapsulation, classes, constructors, hashes, etc.), just a fast-track tutorial (or even a reference?) which could tell us how to do specific things in Ruby.

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• Prototypejs .evalJSON not returning object

  - by Pselus

  I have this JSON (which validates according to JSONLint): [ { "BugCount":"2", "BugTitle":"C:\\INETPUB\\WWWROOT\\CLUBREADY2\\TRAINERS\\../Connections/LTC.asp", "ErrLine":"141", "BugID":"702" }, { "BugCount":"1", "BugTitle":"/admin/ajax_logagreementsig.asp", "ErrLine":"0", "BugID":"1322" }, ] However, when I run data = json.evalJSON on it I get some problems. If I run .evalJSON(true) (to sanitize) an error happens within prototype saying "json" is undefined. The same happens if I do .evalJSON(). If I do .evalJSON with no parenthesis, then data is just an empty object and no error happens. Is there something wrong with my JSON?

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• Where is the System.Runtime.Serialization.Json namespace?

  - by Kayes

  Hi, I've added the reference to System.Runtime.Serialization dll to my project but still can't find the System.Runtime.Serialization.Json namespace and hence can't find the DataContractJsonSerializer class. What am I missing here?

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• EF OrderBy method doesn't work with joins

  - by dudeNumber4

  Following works (ordered by name): from t in context.Table1.OrderBy( "it.Name" ) select t This doesn't work (no ordering): from t in context.Table1.OrderBy( "it.Name" ) join t2 in context.Table2 on t.SomeId equals t2.SomeId select t Nor does this (trying to reference the parent table to order): from t in context.Table1 join t2 in context.Table2.OrderBy( "it.Table1.Name" ) on t.SomeId equals t2.SomeId select t Nor does this (trying to order on the child table): from t in context.Table1 join t2 in context.Table2.OrderBy( "it.ChildName" ) on t.SomeId equals t2.SomeId select t How do I cause OrderBy not to be ignored while joining?

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• Linux, static lib referring to other static lib within an executable

  - by andras

  Hello, I am creating an application, which consists of two static libs and an executable. Let's call the two static libs: libusefulclass.a libcore.a And the application: myapp libcore instantiates and uses the class defined in libusefulclass (let's call it UsefulClass) Now, if I link the application in the following way: g++ -m64 -Wl,-rpath,/usr/local/Trolltech/Qt-4.5.4/lib -o myapp src1.o src2.o srcN.o -lusefulclass -lcore The linker complains about the methods in libusefulclass not being found: undefined reference to `UsefulClass::foo()' etc. I found a workaround for this: If UsefulClass is also instantiated within the source files of the executable itself, the application is linked without any problems. My question is: is there a more clean way to make libcore refer to methods defined in libusefulclass, or static libs just cannot be linked against eachother? TIA P.S.: In case that matters: the application is being developed in C++ using Qt, but I feel this is not a Qt problem, but a library problem in general.

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