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• Timeline graph - how to handle "time gaps"?

  - by ebae

  I've been working with Google chart API and annotated timeline. Drawing graphs is fine. I have no problem. However, I need to draw a timeline graph for share prices. And as you may know, share prices are meaningful only between certain times (e.g. from 10AM to 4PM, when the market opens and closes). How do I change the Google timeline graph so that on X-Axis, the range is from 10AM-4PM? Right now, it just draws a long constant line between 4PM till 10AM next day before prices start to move again. Man, I hope that makes sens. (Google finance chart seems to do it). Thank you SO much for whoever can answer. You are a CHAMPION!

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• Technology stack for very frequent gps data collection

  - by gvaswani

  I am working on a project that involves gps data collection from many users (say 1000) every second (while they move). I am planning on using a dedicated database instance on EC2 with the mysql persistent block storage and run a ruby on rails application with nginx frontend. I haven't worked on such data collection application before. Am I missing something here? I will have a another instance which will act as application server and use the data from the same EBS. If anybody has dealt with such a system before, Any advise would be much appreciated?

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• NNTP & Socket - How to interrupt?

  - by Cosmo

  Hi. I'm sending a message to a NNTP server in order to fetch an article's body. I don't want to wait for the answer to complete, cause I only need the first 3 lines from the body. How can I interrupt the transfer and move on to the next article? Now when I request another's article message body, I still get data from the previous one. The only way that worked for me, was to close the stream and reopen it. In my opinion this is a little bit hardcore, cause I have to login to the server every time I need a new file. Any help would be appreciated. Kind Regards.

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• 8-direction path finding algorithm

  - by frinkz

  I'm having trouble finding the right pathfinding algorithm for some AI I'm working on. I have players on a pitch, moving around freely (not stuck to a grid), but they are confined to moving in 8 directions (N NE E etc.) I was working on using A*, and a graph for this. But I realised, every node on the graph is equally far apart, and all the edges have the same weight - since the pitch is rectangular. And the number of nodes is enormous (being a large pitch, with them able to move between 1 pixel and another) I figured there must be another algorithm, optimised for this sort of thing?

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• How much of Grails GORM to test?

  - by Lloyd Meinholz

  Is there a "best practice" or defacto standard with how much of the GORM functionality one should test in the unit/functional tests? My take is that one should probably do most of the domain testing as functional tests so that you get the full grails environment. But what do you test? Inserts, updates, deletes? Do you test constraints even though they were probably more thoroughly tested by the grails release? Or do you just assume that GORM does what it is supposed to do and move to other parts of the application?

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• tableview - unrecognized selector sent to instance

  - by ct2k7

  Hi, I'v just got this error in my app. 2010-04-06 03:58:55.463 EasyPay DPS[6530:207] WARNING: Using legacy cell layout due to delegate implementation of tableView:accessoryTypeForRowWithIndexPath: in <NTItems: 0x397af90>. Please remove your implementation of this method and set the cell properties accessoryType and/or editingAccessoryType to move to the new cell layout behavior. This method will no longer be called in a future release. 2010-04-06 03:58:55.505 EasyPay DPS[6530:207] *** -[NTItems tableView]: unrecognized selector sent to instance 0x397af90 2010-04-06 03:58:55.515 EasyPay DPS[6530:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NTItems tableView]: unrecognized selector sent to instance 0x397af90' This error is extremely unuseful - where do I start in my code?

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• NSOutlineView not refreshing when objects added to managed object context from NSOperations

  - by John Gallagher

  Background Cocoa app using core data Two processes - daemon and a main UI Daemon constantly writing to a data store UI process reads from same data store NSOutlineView in UI is bound to an NSTreeController which is bound to Application with key path of delegate.interpretedMOC What I want When the UI is activated, the outline view should update with the latest data inserted by the daemon. The Problem Main Thread Approach I fetch all the entities I'm interested in, then iterate over them, doing refreshObject:mergeChanges:YES. This works OK - the items get refreshed correctly. However, this is all running on the main thread, so the UI locks up for 10-20 seconds whilst it refreshes. Fine, so let's move these refreshes to NSOperations that run in the background instead. NSOperation Multithreaded Approach As soon as I move the refreshObject:mergeChanges: call into an NSOperation, the refresh no longer works. When I add logging messages, it's clear that the new objects are loaded in by the NSOperation subclass and refreshed. Not only that, but they are What I've tried I've messed around with this for 2 days solid and tried everything I can think of. Passing objectIDs to the NSOperation to refresh instead of an entity name. Resetting the interpretedMOC at various points - after the data refresh and before the outline view reload. I'd subclassed NSOutlineView. I discarded my subclass and set the view back to being an instance of NSOutlineView, just in case there was any funny goings on here. Added a rearrangeObjects call to the NSTreeController before reloading the NSOutlineView data. Made sure I had set the staleness interval to 0 on all managed object contexts I was using. I've got a feeling this problem is somehow related to caching core data objects in memory. But I've totally exhausted all my ideas on how I get this to work. I'd be eternally grateful of any ideas anyone else has. Code Main Thread Approach // In App Delegate -(void)applicationDidBecomeActive:(NSNotification *)notification { // Delay to allow time for the daemon to save [self performSelector:@selector(refreshTrainingEntriesAndGroups) withObject:nil afterDelay:3]; } -(void)refreshTrainingEntriesAndGroups { NSSet *allTrainingGroups = [[[NSApp delegate] interpretedMOC] fetchAllObjectsForEntityName:kTrainingGroup]; for(JGTrainingGroup *thisTrainingGroup in allTrainingGroups) [interpretedMOC refreshObject:thisTrainingGroup mergeChanges:YES]; NSError *saveError = nil; [interpretedMOC save:&saveError]; [windowController performSelectorOnMainThread:@selector(refreshTrainingView) withObject:nil waitUntilDone:YES]; } // In window controller class -(void)refreshTrainingView { [trainingViewTreeController rearrangeObjects]; // Didn't really expect this to have any effect. And it didn't. [trainingView reloadData]; } NSOperation Multithreaded Approach // In App Delegate -(void)refreshTrainingEntriesAndGroups { JGRefreshEntityOperation *trainingGroupRefresh = [[JGRefreshEntityOperation alloc] initWithEntityName:kTrainingGroup]; NSOperationQueue *refreshQueue = [[NSOperationQueue alloc] init]; [refreshQueue setMaxConcurrentOperationCount:1]; [refreshQueue addOperation:trainingGroupRefresh]; while ([[refreshQueue operations] count] > 0) { [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.05]]; [windowController performSelectorOnMainThread:@selector(refreshTrainingView) withObject:nil waitUntilDone:YES]; } // JGRefreshEntityOperation.m @implementation JGRefreshEntityOperation @synthesize started; @synthesize executing; @synthesize paused; @synthesize finished; -(void)main { [self startOperation]; NSSet *allEntities = [imoc fetchAllObjectsForEntityName:entityName]; for(id thisEntity in allEntities) [imoc refreshObject:thisEntity mergeChanges:YES]; [self finishOperation]; } -(void)startOperation { [self willChangeValueForKey:@"isExecuting"]; [self willChangeValueForKey:@"isStarted"]; [self setStarted:YES]; [self setExecuting:YES]; [self didChangeValueForKey:@"isExecuting"]; [self didChangeValueForKey:@"isStarted"]; imoc = [[NSManagedObjectContext alloc] init]; [imoc setStalenessInterval:0]; [imoc setUndoManager:nil]; [imoc setPersistentStoreCoordinator:[[NSApp delegate] interpretedPSC]]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mergeChanges:) name:NSManagedObjectContextDidSaveNotification object:imoc]; } -(void)finishOperation { saveError = nil; [imoc save:&saveError]; if (saveError) { NSLog(@"Error saving. %@", saveError); } imoc = nil; [self willChangeValueForKey:@"isExecuting"]; [self willChangeValueForKey:@"isFinished"]; [self setExecuting:NO]; [self setFinished:YES]; [self didChangeValueForKey:@"isExecuting"]; [self didChangeValueForKey:@"isFinished"]; } -(void)mergeChanges:(NSNotification *)notification { NSManagedObjectContext *mainContext = [[NSApp delegate] interpretedMOC]; [mainContext performSelectorOnMainThread:@selector(mergeChangesFromContextDidSaveNotification:) withObject:notification waitUntilDone:YES]; } -(id)initWithEntityName:(NSString *)entityName_ { [super init]; [self setStarted:false]; [self setExecuting:false]; [self setPaused:false]; [self setFinished:false]; [NSThread setThreadPriority:0.0]; entityName = entityName_; return self; } @end // JGRefreshEntityOperation.h @interface JGRefreshEntityOperation : NSOperation { NSString *entityName; NSManagedObjectContext *imoc; NSError *saveError; BOOL started; BOOL executing; BOOL paused; BOOL finished; } @property(readwrite, getter=isStarted) BOOL started; @property(readwrite, getter=isPaused) BOOL paused; @property(readwrite, getter=isExecuting) BOOL executing; @property(readwrite, getter=isFinished) BOOL finished; -(void)startOperation; -(void)finishOperation; -(id)initWithEntityName:(NSString *)entityName_; -(void)mergeChanges:(NSNotification *)notification; @end

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• Have VB.Net 2010 ErrorProvider Fire on Tabbing Out of BindingSource TextBox on a WinForm

  - by OneSource

  I have a TextBox control on a Windows Form that uses a DataSource custom object as its BindingSource. I have associated an ErrorProvider with the BindingSource like so: Dim dobExample As New DOExample ExampleBS.DataSource = dobExample epExample.DataSource = ExampleBS The ErrorProvider fires if I type a blank space in the TextBox and then press Tab to move to the next control, which is correct. But it doesn't fire if I just press Tab without entering anything. I want the ErrorProvider to show the Error, even if the TextBox is empty and not just validate when there is text in the TextBox. How do I accomplish this? As an additional bit of info, when I execute the following statement: epDOContact.GetError(TextBox) an empty string is returned even though the TextBox is empty when it is required to be present.

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• Jquery datePicker

  - by Shane

  I have slight issue with the jquery datepicker in that it displays ABOVE the target box. This is due to the way my page is set up. I found the issue with CSS in my page via firebug, unfortunately it conflicts with about 20 elements. Next I tried hooking into the "beforeShow event" which works but then after the event fires it just recalculates and puts it where ever it wants. beforeShow: function() { $('#ui-datepicker-div').show(); var offset = $('#ui-datepicker-div').offset(); $('#ui-datepicker-div').css({ top: (offset.top + 222) + 'px' }) } Does anyone else have any ideas how how I can reposition this? I just need to move it down by about 200 odd pixels.

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• Using OnNcHItTest for a CWnd not CDialog

  - by dev ray

  I have a CWnd Derived object used in a dialog. I need to be able to drag it anywhere in the dialog. I have a code overriding OnNCHitTest for moving a dialog dragging it from a place other than the title bar. Is there any equivalent code to do the same to move this CWnd. The following code isnt working. UINT CBaseSliderBtn::OnNcHitTest(CPoint point) { UINT ret=CWnd::OnNcHitTest( point ); if (ret == HTCLIENT) return HTCAPTION; } If this isn't the right way, please suggest other optimum method to drag the slider. Thanks

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• Does a multithreaded crawler in Python really speed things up?

  - by beagleguy

  Was looking to write a little web crawler in python. I was starting to investigate writing it as a multithreaded script, one pool of threads downloading and one pool processing results. Due to the GIL would it actually do simultaneous downloading? How does the GIL affect a web crawler? Would each thread pick some data off the socket, then move on to the next thread, let it pick some data off the socket, etc..? Basically I'm asking is doing a multi-threaded crawler in python really going to buy me much performance vs single threaded? thanks!

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• Practical non-Turing-complete languages?

  - by Kyle Cronin

  Nearly all programming languages used are Turing Complete, and while this affords the language to represent any computable algorithm, it also comes with its own set of problems. Seeing as all the algorithms I write are intended to halt, I would like to be able to represent them in a language that guarantees they will halt. Regular expressions used for matching strings and finite state machines are used when lexing, but I'm wondering if there's a more general, broadly language that's not Turing complete? edit: I should clarify, by 'general purpose' I don't necessarily want to be able to write all halting algorithms in the language (I don't think that such a language would exist) but I suspect that there are common threads in halting proofs that can be generalized to produce a language in which all algorithms are guaranteed to halt. There's also another way to tackle this problem - eliminate the need for theoretically infinite memory. Once you limit the amount of memory the machine is allowed, the number of states the machine is in is finite and countable, and therefore you can determine if the algorithm will halt (by not allowing the machine to move into a state it's been in before).

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• ASP.NET: Moving ViewState to bottom of page

  - by Seb Nilsson

  What are the latest and greatest ways to move ViewState to bottom of the page Can this be done in a IHttpHandler that can be specified in the web.config to intercept requests to "*.aspx"? <httpHandlers> <add verb="*" path="*.aspx" type="MyApp.OptimizedPageHandler" /> <httpHandlers> Other options is that this could be done in a IHttpModule, but that is not as performant, as it will intercept all requests. Also it could be done in an a class deriving from the Page or MasterPage-class, but this is not as modular. Are there any performance penalties to this?

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• How to measure the time HTTP requests spend sitting in the accept-queue?

  - by David Jones

  I am using Apache2 on Ubuntu 9.10, and I am trying to tune my configuration for a web application to reduce latency of responses to HTTP requests. During a moderately heavy load on my small server, there are 24 apache2 processes handling requests. Additional requests get queued. Using "netstat", I see 24 connections are ESTABLISHED and 125 connections are TIME_WAIT. I am trying to figure out if that is considered a reasonable backlog. Most requests get serviced in a fraction of a second, so I am assuming requests move through the accept-queue fairly quickly, probably within 1 or 2 seconds, but I would like to be more certain. Can anyone recommend an easy way to measure the time an HTTP request sits in the accept-queue? The suggestions I have come across so far seem to start the clock after the apache2 worker accepts the connection. I'm trying to quantify the accept-queue delay before that. thanks in advance, David Jones

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• Devise within namespace

  - by Harm de Wit

  Hey, I'm trying to split my rails project in a front-end for regular users and a back-end for admins. Therefore i have created a namespace 'admin' so that i can easily control admin specific controller methods/layouts/authentication in the map admin. I'm using Devise to register/authenticate my admins only. Because it is only used for admins only i'm trying to move Devise to the admin namespace. I could not find exactly what i was looking for in the documentation of Devise but i tried something like this in routes.rb: namespace 'admin'do devise_for :admins end I also tried to make a custom Devise::Sessions controller but that too didn't seem to work out. Does anyone know how to do this? Should i just use the regular routes for devise with a custom(admin) layout?

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• How to walk through two files simultaneously in Perl?

  - by Alex Reynolds

  I have two text files that contain columnar data of the variety position-value. Here is an example of the first file (file A): 100 1 101 1 102 0 103 2 104 1 ... Here is an example of the second file (B): 20 0 21 0 ... 100 2 101 1 192 3 193 1 ... Instead of reading one of the two files into a hash table, which is prohibitive due to memory constraints, what I would like to do is walk through two files simultaneously, in a stepwise fashion. What this means is that I would like to stream through lines of either A or B and compare position values. If the two positions are equal, then I perform a calculation on the values associated with that position. Otherwise, if the positions are not equal, I move through lines of file A or file B until the positions are equal (when I again perform my calculation) or I reach EOF of both files. Is there a way to do this in Perl?

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• NAVT WordPress Plugin - Not working on index.php

  - by Michael

  Hi there, I need to move my wordpress home page onto the actual index.php file but for some bizarre reason the NAVT plugin doesn't work on there. It also doesn't work on index.php when I put it in the header.php file. It works on all other pages as normal. ALSO, it does work in the footer.php file when viewing the index.php file so this is what makes it all the more confusing. Any ideas what it could be? I've disabled every other plugin so I'm pretty sure there's nothing conflicting. It's rather basic setup and I'm using NAVT default settings. Thanks, Michael.

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• Chipmunk Physics or Box2D for C++ 2D GameEngine ?

  - by Mr.Gando

  Hello, I'm developing what it's turning into a "cross-platform" 2D Game Engine, my initial platform target is iPhone OS, but could move on to Android or even some console like the PSP, or Nintendo DS, I want to keep my options open. My engine is developed in C++, and have been reading a lot about Box2D and Chipmunk but still I can't decide which one to use as my Physics Middleware. Chipmunk appears to have been made to be embedded easily, and Box2D seems to be widely used. Chipmunk is C , and Box2D is C++, but I've heard the API's of Box2D are much worse than chipmunk's API's. For now I will be using the engine shape creation and collision detection features for irregular polygons (not concave). I value: 1) Good API's 2) Easy to integrate. 3) Portability. And of course if you notice anything else, I would love to hear it. Which one do you think that would fit my needs better ?

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• Comparing ASP.Net Framework to Cakephp, Zend , Ruby on Rails

  - by numerical25

  I am a PHP developer migrating to C# ASP.Net Framework. As of right now, I am experienced in using Php for developing sites and I use CakePhp and Zend framework as my RAD tools to help me produce better applications. As I move over to ASP.NET, I have this view that C# ASP.Net framework itself is already a RAD tool and is equivalent to using Cakephp, Zend, or even Ruby on Rails. So I really shouldn't have no concerns trying to find a separate library for ASP.NET that will help me produce better applications. To me, in a sense the ASP.NET is already like a MVC cause it seperates the model from the view and the methods are almost like controllers. So as far as having the best tools are concerned, should I be satisfied with just using ASP.NET as my RAD tool.

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• idomatic batch processing of text in emacs?

  - by Stephen

  In python, you might do something like fout = open('out','w') fin = open('in') for line in fin: fout.write(process(line)+"\n") fin.close() fout.close() (I think it would be similar in many other languages as well). In emacs lisp, would you do something like (find-file 'out') (setq fout (current-buffer) (find-file 'in') (setq fin (current-buffer) (while moreLines (setq begin (point)) (move-end-of-line 1) (setq line (buffer-substring-no-properties begin (point)) ;; maybe (print (process line) fout) ;; or (save-excursion (set-buffer fout) (insert (process line))) (setq moreLines (= 0 (forward-line 1)))) (kill-buffer fin) (kill-buffer fout) which I got inspiration (and code) from here. Or should I try something entirely different? And how to remove the "" from the print statement? Thanks!

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• Adding links to full change forms for inline items in django admin?

  - by David Eyk

  I have a standard admin change form for an object, with the usual StackedInline forms for a ForeignKey relationship. I would like to be able to link each inline item to its corresponding full-sized change form, as the inline item has inlined items of its own, and I can't nest them. I've tried everything from custom widgets to custom templates, and can't make anything work. So far, the "solutions" I've seen in the form of snippets just plain don't seem to work for inlines. I'm getting ready to try some DOM hacking with jQuery just to get it working and move on. I hope I must be missing something very simple, as this seems like such a simple task! Using Django 1.2.

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• Neither IE or Firefox respects the control values that are output

  - by Luke Rohde

  I'm writing a survey designer asp.net mvc. It has buttons to move questions up and down. The buttons post the whole form back and the affected questions are swapped on the server. When the form returns the only thing that is changed are the values for each survey question. Both firefox and IE seem to ignore this change. Nothing is persisted to the database (until save) and url doesn't change so the post just returns the same view but I've stepped through my code to ensure the sequence of values being rendered in the view reflects the swap which is ok. However "view - source" doesn't show the change suggesting caching issue (maybe auto complete). I've tried autocomplete="off" in my form. Response.Cache.SetNoStore(); in my global.asax [System.Web.Mvc.OutputCache(NoStore = true, Duration = 0, VaryByParam = "*")] before my controller and the following in my page header NOTHING!!! This must be real common. Anyone got a clue?

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• My presentation layer does not match my model layer even though I have no animations

  - by Kevin McCullough

  On iPhone I have a CALayer that I animate via Core Animation. Then at some point I change view controllers. I then return to the view controller with the CALayer and in viewWillAppear: I set the frame and position properties on my layer to move it back to its starting point. Setting these properties changes the model layer but the presentation layer still has the old values and its presentation layer does not update until the next animation I play. In the CA Programming guide it says "You can query an instance of CALayer for its corresponding presentation layer while an animation transaction is in process." Which, to me, implies that the presentation layer should only be different from the model layer during an animation. But there are no animations currently running. I even used kCATransactionDisableActions to ensure that when I set the position property an implicit animation is not started. Does anyone know why my presentation and model layers are out of sync? Thanks.

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• Designing Web Service Using Ruby on Rails - Mapping ActiveRecord Models

  - by michaeldelorenzo

  I've put together a RoR application and would now like to publish a RESTful web service for interacting with my application. I'm not sure where to go exactly, I don't want to simply expose my ActiveRecord models since there is some data on each model that isn't needed or shouldn't be exposed via an API like this. I also don't want to create a SOAP solution. My application is built using Rails 2.3.5 and I hope to move to Rails 3.0 soon after its released. I'm basically looking for a way to map my ActiveRecord models to "models" that would be exposed via the web service. Is ActiveResource the correct thing to use? What about ActionWebService?

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• PHP Redirect problem with subdomain

  - by gms8994

  I'm using PHP to redirect a page back to the previous page with the following: header("Location: {$_SERVER['HTTP_REFERER']}"); This set of pages will only be used by internal users, so I'm not terribly concerned about the fact that the referer will not always be available. The problem I'm running in to is that if the referer looks like http://subdomain.domain.com/test.php?id=13, the redirect ends up going to http://subdomain.domain.com/.domain.com/test.php?id=13. Notice the additional .domain.com/ in the url. I've tested by hardcoding the value, and it causes the problem as well. phpMyAdmin seems to suffer the same issue, but only on this particular server. If this is not an SO question, please move accordingly.

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