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• Java: ArrayList bottleneck

  - by Jack

  Hello, while profiling a java application that calculates hierarchical clustering of thousands of elements I realized that ArrayList.get occupies like half of the CPU needed in the clusterization part of the execution. The algorithm searches the two more similar elements (so it is O(n*(n+1)/2) ), here's the pseudo code: int currentMax = 0.0f for (int i = 0 to n) for (int j = i to n) get content i-th and j-th if their similarity > currentMax update currentMax merge the two clusters So effectively there are a lot of ArrayList.get involved. Is there a faster way? I though that since ArrayList should be a linear array of references it should be the quickest way and maybe I can't do anything since there are simple too many gets.. but maybe I'm wrong. I don't think using a HashMap could work since I need to get them all on every iteration and map.values() should be backed by an ArrayList anyway.. Otherwise should I try other collection libraries that are more optimized? Like google's one, or apache one.. Thanks

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• jQuery — Nested Sortables Plugin — Disabling sortability between parents

  - by AJB

  I've got a question that I think is simple but I've not been able to figure it out. This is in regard to this plugin: http://mjsarfatti.com/sandbox/nestedSortable/ Essentially, I want to disable the ability to sort children outside of their parents. So, I've got this: CATEGORY 1 ITEM 1.1 ITEM 1.2 ITEM 1.3 CATEGORY 2 ITEM 2.1 ITEM 2.2 ITEM 2.3 So, I'd like to provide the ability for users to sort the children within their category, and the ability to sort the categories themselves. But I want to disable the ability to move a child to another parent. (e.g. ITEM 1.1 cannot be moved to CATEGORY 2). And also I would like to disable the abilty to nest any parents in any children. I tried setting it so that the 'nestedSortable' function is called for every new OL but that simple disables sorting for everything entirely. Thanks for any help.

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• IMAP Idle Timeout

  - by Paul

  Lets say I am using IMAP IDLE to monitor changes in a mail folder. The IMAP spec says that IDLE connections should only stay alive for 30 minutes max, but it is recommended that a lower number of minutes is selected - say 20 minutes, then cancel the idle and restart. I am wondering what would happen if the mail contents changed between the idle canceling, and the new idle being created. An email could potentially be missed. Given that RECENT is a bit vague, this could lead to getting a message list before the old idle ends, and a new idle starts. But this is almost the same as polling every 20 minutes, and defeats some of the benefit of idle. Alternatively, a new idle session could be started prior to terminating the expiring one. But in any case, I think this problem has already been solved so here I am asking for recommendations. Thanks, Paul

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• issues horizontal scrolling using jQuery.ScrollTo / jQuery.SerialScroll

  - by kapil.israni

  Hi, I am trying to develop auto horizontal scrolling for our website using - jQuery.ScrollTo / jQuery.SerialScroll. I am not sure if this is the best jquery library to do that, but if there's something better, please let me know. Here's the behavior that I want, check out foursquare's "Recent Activity" list. The data that will refresh will come from a ajax request that I make every few seconds using window.setInterval. I am not really a CSS/java script guy so I havent been able to figure out jQuery.SerialScroll. Here's the website - look at the "Live job Feeds" list. Currently the list does refresh the data coming from the ajax call, but I dont see the effect, the animation, in fact I dont even think serialScroll is being used. Right now I am doing a - $('#feed-ticker').prepend(content) to pre-append the newly arrived data. You can do a view source to look at the current code. Any help would be really appreciated. Thanks.

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• How to render a partial and and a javascript file in the same time in Rails ?

  - by master2004

  Hi. My main intention is to keep the functionality independent form the Javascript, to have it gracefully degradable. Maybe I am trying to go where I want the wrong way but the main idea is: there are some jQuery UI tabs and when the user presses a link, a new tab is added corresponding to that action $("#tabs").tabs('add', "/groups", "My Groups"); the controller identifies the AJAX request and renders only the partial for that tab if request.xhr? render :partial => "index_tab" end at this point I would like the Javascript file associated with the /groups/index action to be executed as well, meaning the index.js.erb file in the groups folder. because of the "only one render" rule I couldn't think of a nice way to do it and I am in need of a fast solution. Thank you for any suggestions you might have.

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• Django deployment: PIL and virtualenv problem

  - by AndriJan

  Hey guys, I'm deploying a Django site on my Vserver (Debian Lenny) and I'm having problem with PIL. I'm using virtualenv as well. When I'm in the virtualenv and type pip install -U PIL everything installs fine and I get this: *** TKINTER support not available --- JPEG support available --- ZLIB (PNG/ZIP) support available *** FREETYPE2 support not available *** LITTLECMS support not available And when I go in to the shell (python manage.py shell) and type from PIL import Image I get no error. But when I use it in the Django project (uploading an image in the admin for example) I just get No module named PIL I don't think it's a problem with the model because it works fine on the development machine but here is part of the class: class Category(models.Model): name = models.CharField(max_length=255, verbose_name="Name") logo = models.ImageField(upload_to='images/category/', blank=True, null=True, verbose_name="Logo") I'm going out of my mind about this. I feel like this is a very common issue but I've been trying to google this all day with no luck. Thanks in advance, AndriJan

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• How to calculate line count for project

  - by sixtyfootersdude

  I am taking a software engineering class right now. Our assignment is to evaluate Mozilla's Thunderbird. Our assignment is to evaluate the size of Thunderbird. One metric that we need to use is the number of lines of code in the project. (Lines of code meaning not including comments or new lines). Is there a standard way to find the number of lines or am I better off just cracking out a script to do this? I think that I could do something like this: # remove all comments find -name *.java | \ sed "/\/*/,\*\// s/.*//g | \ # remove multiline comments sed s/\/\///g # remove single line comments # count not empty lines find -name *.java | grep -c "<character>" But I would need to do that for each file type. It seems like there should be some utility that does that already. (something mac/unix compatible would be preferable).

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• .NET Framework 4 Client Profile vs .NET Framework 3.5 Client Profile

  - by Janusz

  Currently I am targeting .NET Framework 3.5 Client profile. Under certain conditions (when .NET 1.x or 2.x is installed) the client profile is not installed and instead full version of .NET Framework 3.5. is installed. This limitation has been removed from .NET 4.0 profile - therefore its a nice improvement that significantly reduces download size on certain PCs. However, if I target application to .NET 4.0 then all the clients will have to download new framework. I think ideal scenario would be to target .NET 3.5 profile but point installer to .NET 4.0 client profile. This way PCs with 3.5 installed (65% from our tests at the moment) would be fine and the rest would install .NET 4.0. Is my thinking correct or its not feasible? Will .NET 3.5 profile application run with only .NET 4.0 profile installed? Thank you

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• Windows "known folders": is there any one of them which is reliably read/write for all users on all

  - by Stabledog

  SHGetKnownFolderPath() and its cohorts accept one of the constants defined here (http://msdn.microsoft.com/en-us/library/dd378457%28v=VS.85%29.aspx ), returning the path to a directory. I'm looking for one of these folders which is reliably writable by all users (including LocalSystem) on XP, Vista, and Windows 7... but I think I'm striking out. It appears that, in fact, there is no single location on the hard drive anymore where you can put a file and be assured that all users can write to it on all these OS versions, without fiddling the permissions first. Is this true?

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• java annotations: library to override annotations with xml files

  - by flybywire

  Java has annotations and that is good. However, some developers feel that it is best to annotate code with metadata using xml files - others prefer annotations but would use metadata to override annotations in source code. I am writing a Java framework that uses annotations. The question is: is there a standard way to define and parse metadata from xml files. I think this is something every framework that uses annotations could benefit from but I can seem to find something like this on the Internet. Must I roll my own xml parsing/validation or has someone already done something like this?

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• Laplacian of Gaussian: how does it work? (opencv)

  - by maximus

  Does anybody know how does it work and how to do it using opencv? Laplacian can be calculated using opencv, but the result is not what I expected. I mean I expect the image to be approximately constant contrast at background regions, but it is black, and edges are white. There are a lot of noise also, even after gauss filter. I filter image using gaussian filter and then apply laplace. I think what I want is done by a different way.

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• Unicode problems with Delphi 2009 / 2010 and windows API calls

  - by Charles Faiga

  Hi I have been using this function in Delphi 2006, but now with D2010 it throws an error. I think it is related to the switch to Unicode. Function TWinUtils.GetTempFile(Const Extension: STRING): STRING; Var Buffer: ARRAY [0 .. MAX_PATH] OF char; Begin Repeat GetTempPath(SizeOf(Buffer) - 1, Buffer); GetTempFileName(Buffer, '~~', 0, Buffer); Result := ChangeFileExt(Buffer, Extension); Until not FileExists(Result); End; What should I do to make it work? EDIT I get an 'access violation' when the ChangeFileExt is called

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• Best aproach for multi-page WPF application

  - by 0xDEAD BEEF

  How do i create multislide application in WPF? What is beast approach? What i need is something very similar to having tabcontrol with multiple pages and navigation buttons bellow, but i dont think that tab control is best for this task. I would like to have each view to be in seperate .xaml + class file. AND- it would be cool to have some animiation, when navigating to another page (like old page slides away or something like that. What would be best technique to achieve this?

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• Jquery Validate Issue

  - by Thomas

  I'm using the Jquery validate plugin to validate a multi-step form like this one: http://jquery.bassistance.de/validate/demo/multipart/ Unfortunately, I can't seem to get it to work at all and there is a total lack of documentation to guide me through implemnetation. I think the accordian part of script is firing correctly because the bottom half of the form is being hidden and a 'next' button has been successfuly inserted. However, the form never validates or delivers an error message and it is impossible to move on to the next step. Check it out here: http://www.loftist.com/?page_id=78

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• Nested class or not nested class?

  - by eriks

  I have class A and list of A objects. A has a function f that should be executed every X seconds (for the first instance every 1 second, for the seconds instance every 5 seconds, etc.). I have a scheduler class that is responsible to execute the functions at the correct time. What i thought to do is to create a new class, ATime, that will hold ptr to A instance and the time A::f should be executed. The scheduler will hold a min priority queue of Atime. Do you think it is the correct implementation? Should ATime be a nested class of the scheduler?

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• Microsoft Reporting v.10 load problem

  - by Branko

  Hi, I am trying to reference microsoft reporting v.10.0.0.0 in my vs studio web site. For some reason it can't achieve that as it is always giving me a compile error that it could not load the type. Error 2625 Could not load type 'Microsoft.Reporting.RdlBuildProvider' from assembly 'Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' One thing that I think it might be a cause is that I had moved from 9.0.0.0 to 10.0.0.0 and after that it does not work. Any suggestions? Thanks a lot!

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• django admin: Add a "remove file" field for Image- or FileFields

  - by w-

  I was hunting around the net for a way to easily allow users to blank out imagefield/filefields they have set in the admin. I found this http://www.djangosnippets.org/snippets/894/ What was really interesting to me here was the code posted in the comment by rfugger remove_the_file = forms.BooleanField(required=False) def save(self, *args, **kwargs): object = super(self.__class__, self).save(*args, **kwargs) if self.cleaned_data.get('remove_the_file'): object.the_file = '' return object When i try to use this in my own form I basically added this to my admin.py which already had a BlahAdmin class BlahModelForm(forms.ModelForm): class Meta: model = Blah remove_img01 = forms.BooleanField(required=False) def save(self, *args, **kwargs): object = super(self.__class__, self).save(*args, **kwargs) if self.cleaned_data.get('remove_img01'): object.img01 = '' return object when i run it I get this error maximum recursion depth exceeded while calling a Python object at this line object = super(self.__class__, self).save(*args, **kwargs) When i think about it for a bit, it seems obvious that it is just infinitely calling itself causing the error. My problem is i can't figure out what is the correct way i should be doing this. Any suggestions? thanks

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• Will you use Delphi Prism

  - by Mohammed Nasman

  CodeGear announces that their Next .Net product which is known as Delphi Prism Will be RemObjects's Oxygene. Oxygene has many nice features that not found in Delphi or C#, and I think it will be a more effective solution for .Net than Delphi .Net previous releases, but it's uses Visual Studio IDE instead of Delphi IDE. which has some cons and pros. As Delphi Developer or .Net Developer, do you consider to use Delphi Prism for .Net developmenet? Look at these Links for more info. Delphi Prism vs. CSharp Delphi Prism - Visual Studio Pascal For .NET Delphi Prims home page

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• wix: does INSTALLDIR always end in a slash?

  - by Cheeso

  I think the default dir gets a trailing slash. But what if the user selects a different directory? Is there a way for the INSTALLDIR to NOT have a trailing slash? It's not that I want it to not have a trailing slash. I want to know if I can count on it, so that, for example, [INSTALLDIR]Filter.dll ...will always resolve to a real, valid filesystem path. Currently I use [INSTALLDIR]\Filter.dll and I get a double-slash in there. It's valid and resolves, but I'd like to eliminate the double slash. thanks.

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• Emgu CV - memory-leaks (memory consumption)

  - by martin pilch

  I am using EmguCV, the OpenCV wrapper for .NET. I am disposing all created objects but my app is still using more and more memory (in release configuration too). I have debugged my app using .NET Memory profiler and get this result: http://img532.imageshack.us/img532/2503/screenqv.png all objects instance count is oscilating but GChandle instance counr is increasing until my machine is unusable. Garbage collector does not release memory (i think). I am using VS 2008 professional, Win7 prof 32-bit, both up to date, and last stable version of emguCV. I can post some app code, if it will help. Thanks and sorry for my English. Martin

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• umbraco tiny MCE 3 internet explorer insert link error

  - by user150946

  Hi, I have an instalation of Umbraco 4.0.2.1. In internet explorer (6 / 7) i get an error when trying to insert a link using the tiny MCE rich text editor. basicaly what happens is i can choose the node in the site i want to link to but when i click insert it reloads but the tiny MCE popup does not dissapear and i get the following page error. Line: 368 Char: 9 Error: 'the Form._SCROLLPOSITIONX.value' is null or not an object code: 0 URL: "mydev server"/umbraco/plugins/tinymce3/insertLink.aspx I dont get this problem in Firefox and i have other instalations of umbraco 4.0.2.1 in which this error does not occur. I have tried using WinMerge to comparing the code of the two instalations and they seem identical in all the places i can think would have an effect on tinyMCE ("bin", "umbraco_client\tinymce3", "umbraco\plugins\tinymce3") I am pulling my hair out over this and any help would be very much appreciated.

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• HTML form -> Flash submit button -> Set a PHP variable in flash button -> Submit form

  - by RobHardgood

  Okay, I'm sorry that this is pretty complicated, but it shouldn't be that hard to solve... Here's what I want to do. I have an HTML form that I want to upload to MySQL with PHP. That part's easy, but the thing is I want the submit button to be a Flash object. Somehow I need the Flash button to submit the form, but I think I can figure that out. The tricky part is that I need it to set another PHP variable before submitting the form. The variable will be determined by a bunch of stuff, but I can code that in actionscript later. I just need to figure out how to pass the variable back to the webpage. A $_POST variable would probably be fine. Thanks!! Let me know if I need to clarify more...

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• Mutable class as a child of an immutable class

  - by deamon

  I want to have immutable Java objects like this (strongly simplyfied): class Immutable { protected String name; public Immutable(String name) { this.name = name; } public String getName() { return name; } } In some cases the object should not only be readable but mutable, so I could add mutability through inheritance: public class Mutable extends Immutable { public Mutable(String name) { super(name); } public void setName(String name) { super.name = name; } } While this is technically fine, I wonder if it conforms with OOP and inheritance that mutable is also of type immutable. I want to avoid the OOP crime to throw UnsupportedOperationException for immutable object, like the Java collections API does. What do you think? Any other ideas?

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• Getting WIF to work with OpenSSO as STS

  - by Tyler

  Hi gang, Using OpenSSO as an identity provider, what should I do (i.e. with FedUtil.exe) to configure my .NET relying party so that it will do the STS dance? I've gotten OpenSSO's WS-Trust client samples running, so I think OSSO's in a good state and ready for the next step. I'm at the FedUtil.exe's "Use an existing STS" wall. Where do I get the STS WS-Federation metadata document for OpenSSO? I've tried: the.osso.server:port/opensso/sts the.osso.server:port/opensso/sts?wsdl the.osso.server:port/opensso/sts/mex the.osso.server:port/opensso/sts/mex?wsdl the.osso.server:port/opensso/sts/soap11 the.osso.server:port/opensso/sts/soap11?wsdl with no luck. Thanks for your help, Tyler

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• Reasons for NSManagedObjectMergeError error on [NSManagedObjectContext save:]

  - by ross-kimes

  I have a application that combines threading and CoreData. I and using one global NSPersistentStoreCoordinator and a main NSManagedObjectContextModel. I have a process where I have to download 9 files simultaneously, so I created an object to handle the download (each individual download has its own object) and save it to the persistentStoreCoordinator. In the [NSURLConnection connectionDidFinishLoading:] method, I created a new NSManagedObject and attempt to save the data (which will also merge it with the main managedObjectContext). I think that it is failing due to multiple process trying to save to the persistentStoreCoordinator at the same time as the downloads are finishing around the same time. What is the easiest way to eliminate this error and still download the files independently? Thank you!

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