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  • Space partitioning algorithm

    - by Karol Kolenda
    I have a set of points which are contained within the rectangle. I'd like to split the rectangles into subrectangles based on point density (giving a number of subrectangles or desired density, whichever is easiest). The partitioning doesn't have to be exact (almost any approximation better than regular grid would do), but the algorithm have to cope with the large number of points - approx. 200 millions. The desired number of subrectangles however is substantially lower (around 1000). Does anyone knows any algorithm which may help me with this particular task?

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  • Merge method in MergeSort Algorithm .

    - by Tony
    I've seen many mergeSort implementations .Here is the version in Data Structures and Algorithms in Java (2nd Edition) by Robert Lafore : private void recMergeSort(long[] workSpace, int lowerBound,int upperBound) { if(lowerBound == upperBound) // if range is 1, return; // no use sorting else { // find midpoint int mid = (lowerBound+upperBound) / 2; // sort low half recMergeSort(workSpace, lowerBound, mid); // sort high half recMergeSort(workSpace, mid+1, upperBound); // merge them merge(workSpace, lowerBound, mid+1, upperBound); } // end else } // end recMergeSort() private void merge(long[] workSpace, int lowPtr, int highPtr, int upperBound) { int j = 0; // workspace index int lowerBound = lowPtr; int mid = highPtr-1; int n = upperBound-lowerBound+1; // # of items while(lowPtr <= mid && highPtr <= upperBound) if( theArray[lowPtr] < theArray[highPtr] ) workSpace[j++] = theArray[lowPtr++]; else workSpace[j++] = theArray[highPtr++]; while(lowPtr <= mid) workSpace[j++] = theArray[lowPtr++]; while(highPtr <= upperBound) workSpace[j++] = theArray[highPtr++]; for(j=0; j<n; j++) theArray[lowerBound+j] = workSpace[j]; } // end merge() One interesting thing about merge method is that , almost all the implementations didn't pass the lowerBound parameter to merge method . lowerBound is calculated in the merge . This is strange , since lowerPtr = mid + 1 ; lowerBound = lowerPtr -1 ; that means lowerBound = mid ; Why the author didn't pass mid to merge like merge(workSpace, lowerBound,mid, mid+1, upperBound); ? I think there must be a reason , otherwise I can't understand why an algorithm older than half a center ,and have all coincident in the such little detail.

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  • Suggested GA operators for a TSP problem?

    - by Mark
    I'm building a genetic algorithm to tackle the traveling salesman problem. Unfortunately, I hit peaks that can sustain for over a thousand generations before mutating out of them and getting better results. What crossover and mutation operators generally do well in this case?

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  • Google Maps v3, custom control with textbox: can't perform input

    - by Mike Sviridoff
    Hi, I am trying to add a custom control to my google map (v3): want to have search box just near the other map controls. So I add a div with <input type="textbox"> on it, and it's being shown on the map. But the porblem is that the textbox is inaccessible: i can't type anything inside it, or even focus on it. function SearchBox() { var searchTextBox = $('<input type="text" id="txtGeoSearch" />'); var div = $('<div class="geoSearchBox"></div>') .append($('<span>Search:</span>')) .append(searchTextBox); return div.get(0); } // inside init() geoMap.controls[google.maps.ControlPosition.TOP_LEFT].push(new SearchBox()); So what should I do to make my textbox behave like normal one?

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  • Suggestion on algorithm to distribute objects of different value

    - by Unknown
    Hello, I have the following problem: Given N objects of different values (N < 30, and the values are multiple of a "k" constant, i.e. k, 2k, 3k, 4k, 6k, 8k, 12k, 16k, 24k and 32k), I need an algorithm that will distribute all items to M players (M <= 6) in such a way that the total value of the objects each player gets is as even as possible (in other words, I want to distribute all objects to all players in the fairest way possible). I don't need (pseudo)code to solve this (also, this is not a homework :) ), but I'll appreciate any ideas or links to algorithms that could solve this. Thanks!

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  • FB.Event.subscribe + comments.add don't work !?

    - by user366292
    I'm trying to catch event when comment is sent. What am I doing wrong? I just want to update every user comment also to facebook group wall and that's why I need to catch the event. <fb:comments numposts="10" ></fb:comments> FB.init and event catcher: <div id="fb-root"></div> <script> window.fbAsyncInit = function() { FB.init({ appId : 'sensored-app-id', status : true, // check login status cookie : true, // enable cookies to allow the server to access the session xfbml : true // parse XFBML }); /* All the events registered */ FB.Event.subscribe('comments.add', function (response) { // do something with response alert("comment added"); }); }; (function() { var e = document.createElement('script'); e.src = document.location.protocol + '//connect.facebook.net/fi_FI/all.js'; e.async = true; document.getElementById('fb-root').appendChild(e); }()); </script>

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  • Singleton pattern in web applications

    - by ryudice
    I'm using a singleton pattern for the datacontext in my web application so that I dont have to instantiate it every time, however I'm not sure how web applications work, does IIS open a thread for every user connected? if so, what would happend if my singleton is not thread safe? Also, is it OK to use a singleton pattern for the datacontext? Thanks.

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  • Facebook Connect: hasPermission() from js?

    - by Martin
    Is it possible to determine whether a user has granted my app a specific permission or not via javascript? Something similar to how you do it in php: $fb->api_client->users_hasAppPermission('publish_stream'); I know i can request a permission with FB.Connect.showPermissionDialog('publish_stream', null); But i just wan't to know if i have the permission or not.

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  • Integrating Google Analytics into GWT application

    - by Domchi
    This should be totally simple but I can't get it working no matter what I try. I'm trying to use Google Analytics with GWT application. From what I understood, there are two way to do it: First is synchronous, by inserting tracking code at the end of <head> section HTML page and then calling this method: public static native void recordAnalyticsHit(String pageName) /*-{ pageTracker._trackPageview(pageName); }-*/; Second is asynchronous, by inserting tracking code just after <body> tag and then calling this method: public static native void recordAnalyticsHit(String pageName) /*-{ _gaq.push(['_trackPageview(' + pageName + ')']); }-*/; When running each of those methods, however, I get this exceptions in hosted mode: [ERROR] [myproject] Uncaught exception escaped com.google.gwt.core.client.JavaScriptException: (ReferenceError): pageTracker is not defined [ERROR] [myproject] Uncaught exception escaped com.google.gwt.core.client.JavaScriptException: (ReferenceError): _gaq is not defined When observing site in Firebug, I see that ga.js gets loaded, but that's about it. Did anyone get Analytics working with GWT? Also, does _gaq accept page name as trackPageview parameter, since all the examples I've seen use this call: _gaq.push(['_trackPageview()']); (Of course, that also doesn't work for me.)

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  • Android mapView ItemizedOverlay setFocus does not work properly

    - by Gaks
    Calling setFocus(null) on the ItemizedOverlay does not 'unfocus' current marker. According to the documentation: ... If the Item is not found, this is a no-op. You can also pass null to remove focus. Here's my code: MapItemizedOverlay public class MapItemizedOverlay extends ItemizedOverlay<OverlayItem> { private ArrayList<OverlayItem> items = new ArrayList<OverlayItem>(); public MapItemizedOverlay(Drawable defaultMarker) { super(defaultMarker); } public void addOverlay(OverlayItem overlay) { items.add(overlay); populate(); } @Override protected OverlayItem createItem(int i) { return items.get(i); } @Override public int size() { return items.size(); } } Creating map overlay and one marker: StateListDrawable youIcon = (StateListDrawable)getResources().getDrawable(R.drawable.marker_icon); int width = youIcon.getIntrinsicWidth(); int height = youIcon.getIntrinsicHeight(); youIcon.setBounds(-13, 0-height, -13+width, 0); GeoPoint location = new GeoPoint(40800816,-74122009); MapItemizedOverlay overlay = new MapItemizedOverlay(youIcon); OverlayItem item = new OverlayItem(location, "title", "snippet"); overlay.addOverlay(item); mapView.getOverlays().add(overlay); The R.drawable.marker_icon is defined as follows: <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_focused="true" android:drawable="@drawable/marker_selected" /> <item android:state_selected="true" android:drawable="@drawable/marker_selected" /> <item android:drawable="@drawable/marker_normal" /> </selector> Now, to test the setFocus() behavior I put the button on the activity window, with the following onClick listener: Button focusBtn = (Button)findViewById(R.id.focusbtn); focusBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { for(Overlay ov : mapView.getOverlays()) { if(ov.getClass().getSimpleName().equals("MapItemizedOverlay") == true) { MapItemizedOverlay miv = (MapItemizedOverlay)ov; if(miv.getFocus() == null) miv.setFocus(miv.getItem(0)); else miv.setFocus(null); break; } } mapView.invalidate(); } }); The expected behavior is: clicking on the button toggles marker selection. It works only once - clicking it for the first time selects the marker, clicking it again does not de-select the marker. The most weird thing about it is that after calling setFocus(null), getFocus() also returns null - like the overlay has no focused item (I debugged it). But even after calling mapView.invalidate() the marker is still drawn in 'selected'(focused) state.

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  • Good book for THINKING in terms of algorithms?

    - by chrisgoyal
    Before you mark this is a duplicate, let me explain why this is different. Most of the books on algorithms are more of a reference. You basically have a list of algorithms at your disposal. But what happens when you need to create a new algorithm for something? These books don't teach how to think in terms of algorithms. So I'm looking for books that will teach me the thinking-process of creating algorithms. Any good suggestions?

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  • Looking for search syntax documentation for SharePoint UserProfileManager.Search Method

    - by gregenslow
    Greetings - I have a SharePoint 2010 server running with the User Profile service setup to synchronize to Active Directory. I'd like to use the UserProfileManager.Search() method to return user profiles based on specific criteria. MSDN documentation for this method is here. It states that the method will return user profiles that match the specified search pattern. This is exactly what I want. However, there is no documentation on what a valid search pattern is. I've made a few guesses like "Department = 'HR'" but haven't had any luck. I can't find any other documentation or sample code. Can anyone provide samples of valid "search patterns?" Another way to return user profiles is to do a query using the FullTextSqlQuery object. We don't yet have Search setup on this server so this isn't currently an option. Thanks, Greg

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  • Orkut.com -- architecture and technology behind it

    - by Vadi
    I am looking for the architecture and technology behind orkut.com, since it is one of the largest asp.net based application. I am able to get Facebook related details but not Orkut.com as I am looking for windows-based solution for such type of application. Any details are greatly appreciated ..

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  • Problem with FedEx Address validation web service

    - by DJ Matthews
    Hi, I'm trying to get started with Fedex'es Address validation service and I'm running into a road block with FedEx's own demo application. This is the code in there app: Sub Main() ''# Build a AddressValidationRequest object Dim request As AddressValidationRequest = New AddressValidationRequest() Console.WriteLine("--- Setting Credentials ---") request.WebAuthenticationDetail = New WebAuthenticationDetail() request.WebAuthenticationDetail.UserCredential = New WebAuthenticationCredential() request.WebAuthenticationDetail.UserCredential.Key = "###" ''# Replace "XXX" with the Key request.WebAuthenticationDetail.UserCredential.Password = "###" ''# Replace "XXX" with the Password Console.WriteLine("--- Setting Account Information ---") request.ClientDetail = New ClientDetail() request.ClientDetail.AccountNumber = "###" ''# Replace "XXX" with clients account number request.ClientDetail.MeterNumber = "###" ''# Replace "XXX" with clients meter number request.TransactionDetail = New TransactionDetail() request.TransactionDetail.CustomerTransactionId = "Address Validation v2 Request using VB.NET Sample Code" ''# This is just an echo back request.Version = New VersionId() request.RequestTimestamp = DateTime.Now Console.WriteLine("--- Setting Validation Options ---") request.Options = New AddressValidationOptions() request.Options.CheckResidentialStatus = True request.Options.MaximumNumberOfMatches = 5 request.Options.StreetAccuracy = AddressValidationAccuracyType.LOOSE request.Options.DirectionalAccuracy = AddressValidationAccuracyType.LOOSE request.Options.CompanyNameAccuracy = AddressValidationAccuracyType.LOOSE request.Options.ConvertToUpperCase = True request.Options.RecognizeAlternateCityNames = True request.Options.ReturnParsedElements = True Console.WriteLine("--- Address 1 ---") request.AddressesToValidate = New AddressToValidate(1) {New AddressToValidate(), New AddressToValidate()} request.AddressesToValidate(0).AddressId = "WTC" request.AddressesToValidate(0).Address = New Address() request.AddressesToValidate(0).Address.StreetLines = New String(0) {"10 FedEx Parkway"} request.AddressesToValidate(0).Address.PostalCode = "38017" request.AddressesToValidate(0).CompanyName = "FedEx Services" Console.WriteLine("--- Address 2 ---") request.AddressesToValidate(1).AddressId = "Kinkos" request.AddressesToValidate(1).Address = New Address() request.AddressesToValidate(1).Address.StreetLines = New String(0) {"50 N Front St"} request.AddressesToValidate(1).Address.PostalCode = "38103" request.AddressesToValidate(1).CompanyName = "FedEx Kinkos" Dim addressValidationService As AddressValidationService.AddressValidationService = New AddressValidationService.AddressValidationService ''# Try ''# This is the call to the web service passing in a AddressValidationRequest and returning a AddressValidationReply Console.WriteLine("--- Sending Request..... ---") Dim reply As New AddressValidationReply() reply = addressValidationService.addressValidation(request) Console.WriteLine("--- Processing request.... ---") ''#This is where I get the error If (Not reply.HighestSeverity = NotificationSeverityType.ERROR) And (Not reply.HighestSeverity = NotificationSeverityType.FAILURE) Then If (Not reply.AddressResults Is Nothing) Then For Each result As AddressValidationResult In reply.AddressResults Console.WriteLine("Address Id - " + result.AddressId) Console.WriteLine("--- Proposed Details ---") If (Not result.ProposedAddressDetails Is Nothing) Then For Each detail As ProposedAddressDetail In result.ProposedAddressDetails Console.WriteLine("Score - " + detail.Score) Console.WriteLine("Address - " + detail.Address.StreetLines(0)) Console.WriteLine(" " + detail.Address.StateOrProvinceCode + " " + detail.Address.PostalCode + " " + detail.Address.CountryCode) Console.WriteLine("Changes -") For Each change As AddressValidationChangeType In detail.Changes Console.WriteLine(change.ToString()) Next Console.WriteLine("") Next End If Console.WriteLine("") Next End If Else For Each notification As Notification In reply.Notifications Console.WriteLine(notification.Message) Next End If Catch e As SoapException Console.WriteLine(e.Detail.InnerText) Catch e As Exception Console.WriteLine(e.Message) End Try Console.WriteLine("Press any key to quit !") Console.ReadKey() End Sub It seems to send the request object to the web service, but the"reply" object is returned with "Nothing". I could understand if I wrote the code, but good god... they can't even get their own code to work? Has anyone else seen/fixed this problem?

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  • Facebook Application Tab On Page Not Working

    - by Pankaj Khurana
    Hi, I have a working facebook fbml application tab on a page. It was working perfectly but today when i checked it was generating an error. Errors while loading page from application Parse errors: FBML Error (line 18): illegal tag "body" under "fb:tab-position" FBML Error (line 26): illegal tag "noscript" under "fb:tab-position" FBML Error (line 44): illegal tag "noscript" under "fb:tab-position" Runtime errors: HTML error while rendering tag "link": There is a hard limit of 2 css link tags on profile tabs in order to remain under the IE 31 tag limit. HTML error while rendering tag "link": There is a hard limit of 2 css link tags on profile tabs in order to remain under the IE 31 tag limit. Cannot allow external script My settings are: Canvas Callback URL: http://mydomain/myfile/ Canvas URL: http://mydomain/myfeedback/ Tab Name: Feedback Tab URL: http://apps.facebook.com/myfeedback/ This is an fbml application without any body tags I am unable to find out the reason for the same. Please help me on this. Thanks

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  • Google slideshow shows a blank screen when calling from ajax

    - by ufk
    I'm having problems implementing google slideshow (http://www.google.com/uds/solutions/slideshow/index.html) to my web application by loading it using a jquery load() function. index.html: <script type="text/javascript" src="jquery-1.3.2.js"></script> <div id="moshe"></div> <script type="text/javascript"> $(document).ready(function(){ $('#moshe').load('test.html'); }); </script> test.html: <script type="text/javascript"> function load() { var samples = "http://dlc0421.googlepages.com/gfss.rss"; var options = { displayTime: 2000, transistionTime: 600, linkTarget : google.feeds.LINK_TARGET_BLANK }; new GFslideShow(samples, "slideshow", options); } google.load("feeds", "1"); google.setOnLoadCallback(load); </script> <div id="slideshow" class="gslideshow" style="width:300px;height:300px;position:relative; border: 2px solid blue">Loading...</div> When i execute the test.html, it loads the slideshow just fine. when i try to load using index.html that actually calls Jquery's $.load() function that loads the content of test.html into a specific div element, i see that the gallery is loading on that div, but when it's about to show images the entire page clears and all i have is a blank page. Any ideas ? a different version of index.html without using jquery: <script type="text/javascript"> function makeRequest(url) { var httpRequest; if (window.XMLHttpRequest) { // Mozilla, Safari, ... httpRequest = new XMLHttpRequest(); if (httpRequest.overrideMimeType) { httpRequest.overrideMimeType('text/xml'); // See note below about this line } } else if (window.ActiveXObject) { // IE try { httpRequest = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { httpRequest = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} } } if (!httpRequest) { alert('Giving up :( Cannot create an XMLHTTP instance'); return false; } httpRequest.onreadystatechange = function() { alertContents(httpRequest); }; httpRequest.open('GET', url, true); httpRequest.send(''); } function alertContents(httpRequest) { if (httpRequest.readyState == 4) { if (httpRequest.status == 200) { document.getElementById('moshe').innerHTML=httpRequest.responseText; } else { alert('There was a problem with the request.'); } } } makeRequest('test.html'); </script>

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  • Auto Login facebook user into application

    - by user537562
    So, Here is the scenario I am trying to fix. A returning user is logged into facebook but not logged into the application. In this case when the user tries to load the application, since the user cookie is not attained yet, it redirects the user to the login page. I googled around and found this solution, FB.Event.subscribe('auth.sessionChange', function(response) { if (response.session) { window.location.reload(); } } basically whats happening here is, we are registering to facebook for a login/logout event and when it receives a response, we reload the page. Now its loads the right page since we have the user cookie on our site domain after the first load. this works, but the problem is the double load. It takes a lot of time. How can I attain the user cookie on server side for returning user? so that I don't have to do the initial page reload. Also, I have looked at yelp, and somehow they are able to load the user information without doing double load, does any body know they are able to do it? Any help is greatly appreciated, Thanks!

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  • Help with a compiler warning: Initialization from distinct Objective-C type when types match

    - by Alex Gosselin
    Here is the function where I get the compiler warning, I can't seem to figure out what is causing it. Any help is appreciated. -(void)displaySelector{ //warning on the following line: InstanceSelectorViewController *controller = [[InstanceSelectorViewController alloc] initWithCreator:self]; [self.navController pushViewController:controller animated:YES]; [controller release]; } Interface and implementation for the initWithCreator: method -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)creator; -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)crt{ if (self = [self initWithNibName:@"InstanceSelectorViewController" bundle:nil]) { creator = crt; } return self; }

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  • jQuery plugin for Event Driven Architecture?

    - by leeand00
    Are there any Event Driven Architecture jQuery plugins? Step 1: Subscribing The subscribers subscribe to the event handler in the middle, and pass in a callback method, as well as the name of the event they are listening for... i.e. The two green subscribers will be listening for p0 events. And the blue subscriber will be listening for p1 events. Step 2: The p0 event is fired by another component to the Event Handler A p0 event is fired to the Event Handler The event handler notifies it's subscribers of the event, calling the callback methods they specified when they subscribed in Step 1: Subscribing. Note that the blue subscriber is not notified because it was not listening for p0 events. Step 3: The p1 event is fired a component to the Event Handler The p1 event is fired by another component Just as before except that now the blue subscriber receives the event through its callback and the other two green subscribers do not receive the event. Images by leeand00, on Flickr I can't seem to find one, but my guess is that they just call it something else in Javascript/jquery Also is there a name for this pattern? Because it isn't just a basic publisher/subscriber, it has to be called something else I would think.

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  • [Principles] Concrete Type or Interface for method return type?

    - by SDReyes
    In general terms, whats the better election for a method's return type: a concrete type or an interface? In most cases, I tend to use concrete types as the return type for methods. because I believe that an concrete type is more flexible for further use and exposes more functionality. The dark side of this: Coupling. The angelic one: A concrete type contains per-se the interface you would going to return initially, and extra functionality. What's your thumb's rule? Is there any programming principle for this? BONUS: This is an example of what I mean http://stackoverflow.com/questions/491375/readonlycollection-or-ienumerable-for-exposing-member-collections

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  • How to handle payment types with varying properties in the most elegant way.

    - by Byron Sommardahl
    I'm using ASP.NET MVC 2. Keeping it simple, I have three payment types: credit card, e-check, or "bill me later". I want to: choose one payment type display some fields for one payment type in my view run some logic using those fields (specific to the type) display a confirmation view run some more logic using those fields (specific to the type) display a receipt view Each payment type has fields specific to the type... maybe 2 fields, maybe more. For now, I know how many and what fields, but more could be added. I believe the best thing for my views is to have a partial view per payment type to handle the different fields and let the controller decide which partial to render (if you have a better option, I'm open). My real problem comes from the logic that happens in the controller between views. Each payment type has a variable number of fields. I'd like to keep everything strongly typed, but it feels like some sort of dictionary is the only option. Add to that specific logic that runs depending on the payment type. In an effort to keep things strongly typed, I've created a class for each payment type. No interface or inherited type since the fields are different per payment type. Then, I've got a Submit() method for each payment type. Then, while the controller is deciding which partial view to display, it also assigns the target of the submit action. This is not elegant solution and feels very wrong. I'm reaching out for a hand. How would you do this?

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  • google reader like architecture

    - by islam
    dear i want to make architect for application like google reader that save users feeds(rss,atoms) in database what is the best architecture i can do to make something like this ineed to know a good db desgin if i have to save something on files (xml or something) need to archive .etc hope to find some hints

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