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• string matching algorithms used by lucene

  - by iamrohitbanga

  i want to know the string matching algorithms used by Apache Lucene. i have been going through the index file format used by lucene given here. it seems that lucene stores all words occurring in the text as is with their frequency of occurrence in each document. but as far as i know that for efficient string matching it would need to preprocess the words occurring in the Documents. example: search for "iamrohitbanga is a user of stackoverflow" (use fuzzy matching) in some documents. it is possible that there is a document containing the string "rohit banga" to find that the substrings rohit and banga are present in the search string, it would use some efficient substring matching. i want to know which algorithm it is. also if it does some preprocessing which function call in the java api triggers it.

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• Allocate constant memory

  - by Vlad

  I'm trying to set my simulation params in constant memory but without luck (CUDA.NET). cudaMemcpyToSymbol function returns cudaErrorInvalidSymbol. The first parameter in cudaMemcpyToSymbol is string... Is it symbol name? actualy I don't understand how it could be resolved. Any help appreciated. //init, load .cubin float[] arr = new float[1]; arr[0] = 0.0f; int size = Marshal.SizeOf(arr[0]) * arr.Length; IntPtr ptr = Marshal.AllocHGlobal(size); Marshal.Copy(arr, 0, ptr, arr.Length); var error = CUDARuntime.cudaMemcpyToSymbol("param", ptr, 4, 0, cudaMemcpyKind.cudaMemcpyHostToDevice); my .cu file contain __constant__ float param;

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• Copy a linked list

  - by emkrish

  typedef struct Node { int data; Node *next; Node *other; }; Node *pHead; pHead is a singly linked list. The next field points to the next element in the list. The other field may point to any other element (could be one of the previous nodes or one of the nodes ahead) in the list or NULL. How does one write a copy function that duplicates the linked list and its connectivity? None of the elements (next and other) in the new list should point to any element in the old list.

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• Boost Thread Specific Storage Question (boost/thread/tss.hpp)

  - by Hassan Syed

  The boost threading library has an abstraction for thread specific (local) storage. I have skimmed over the source code and it seems that the TSS functionality can be used in an application with any existing thread regardless of weather it was created from boost::thread --i.e., this implies that certain callbacks are registered with the kernel to hook in a callback function that may call the destructor of any TSS objects when the thread or process is going out of scope. I have found these callbacks. I need to cache HMAC_CTX's from OpenSSL inside the worker threads of various web-servers (see this, detailed, question for what I am trying to do), and as such I do not controll the life-time of the thread -- the web-server does. Therefore I will use the TSS functionality on threads not created by boost::thread. I just wanted to validate my assumptions before I started implementing the caching logic, are there any flaws in my logic ?

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• HttpWebRequest is extremely slow!

  - by Earlz

  Hello, I am using an open source library to connect to my webserver. I was concerned that the webserver was going extremely slow and then I tried doing a simple test in Ruby and I got these results Ruby program: 2.11seconds for 100 HTTP GETs C# library: 20.81seconds for 100 HTTP GETs I have profiled and found the problem to be this function: private HttpWebResponse GetRawResponse(HttpWebRequest request) { HttpWebResponse raw = null; try { raw = (HttpWebResponse)request.GetResponse(); //This line! } catch (WebException ex) { if (ex.Response is HttpWebResponse) { raw = ex.Response as HttpWebResponse; } } return raw; } The marked line is takes over 1 second to complete by itself while the ruby program making 1 request takes .3 seconds. I am also doing all of these tests on 127.0.0.1, so network bandwidth is not an issue. What could be causing this huge slow down?

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• django return file over HttpResonse - file is not served correctly

  - by Tom Tom

  I want to return some files in a HttpResponse and I'm using the following function. The file that is returned always has a filesize of 1kb and I do not know why. I can open the file, but it seems that it is not served correctly. Thus I wanted to know how one can return files with django/python over a HttpResponse. @login_required def serve_upload_files(request, file_url): import os.path import mimetypes mimetypes.init() try: file_path = settings.UPLOAD_LOCATION + '/' + file_url fsock = open(file_path,"r") #fsock = open(file_path,"r").read() file_name = os.path.basename(file_path) mime_type_guess = mimetypes.guess_type(file_name) try: if mime_type_guess is not None: response = HttpResponse(mimetype=mime_type_guess[0]) response['Content-Disposition'] = 'attachment; filename=' + file_name response.write(fsock) finally: fsock.close() except IOError: response = HttpResponseNotFound() return response

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• Calculate total by javascript in gridview with paging

  - by louis

  Without paging function, i can loop through the gridview by using var sum = 0; var gridViewCtlId = '<%=timesheetView.ClientID%>'; var grid = document.getElementById(gridViewCtlId); var gridLength = grid.rows.length; so with gridLength i can loop through the gridview to sum all rows. However, when I use paging event of gridview, i use the page size to loop through all rows, but it occurs errors because the last page may not have enough rows. So would you please to help me how to get the rows in the each page of gridview?

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• Recursion and Iteration

  - by Doug

  What is the difference? Are these the same? If not, can someone please give me an example? MW: Iteration - 1 : the action or a process of iterating or repeating: as a : a procedure in which repetition of a sequence of operations yields results successively closer to a desired result b : the repetition of a sequence of computer instructions a specified number of times or until a condition is met Recusion - 3 : a computer programming technique involving the use of a procedure, subroutine, function, or algorithm that calls itself one or more times until a specified condition is met at which time the rest of each repetition is processed from the last one called to the first

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• Inline & not-inline

  - by anon

  Suppose I have: struct Vec3 { double x; double y; double z; } ; inline double dot(const Vec3& lhs, const Vec3& rhs) { return lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z ; } Is it possible to have "dot" also exist in a non-inlined version, so that it can be in the *.so , so that when I dl open it I can call it? I.e. I want files that include the above header to use the inlined version, but I also want the function to exist in a *.so, so I can dl open it and call it dynamically.

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• Casting To The Correct Subclass

  - by kap

  Hi Guys I hava a supeclass called Car with 3 subclasses. class Ford extends Car{ } class Chevrolet extends Car{ } class Audi extends Car{ } Now i have a function called printMessge(Car car) which will print a message of a particular car type. In the implementation i use if statements to test the instance of the classes like this. public int printMessge(Car car){ if((Ford)car instanceof Ford){ // print ford }else if((Chevrolet)car instanceof Chevrolet){ // print chevrolet }else if((Audi)car instanceof Audi){ // print Audi } } for instance if i call it for the first time with Ford printMessge(new Ford()), it prints the ford message but when i call it with printMessge(new Chevrolet()), i get EXCEPTION from the first if statement that Chevrolet cannot be cast to Ford. What am i doing wrong and what is the best way. thanks

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• fuzzy implementaion for capture specific strings

  - by kasun-456

  I am going to develop a web crawler using java to capture hotel room prices from hotel websites. In this case i want to capture room price with the room type and the meal type, so my algorithm should intelligent for that. as an example: Room type: Delux Meal type: HalfBoad price : $20.00 The main problem is room prices can be in different different ways in different different hotel sites. so my algorithm should independent from hotel sites. I am plan to use above room types and meal types as a fuzzy sets and compare the words in webpage with above fuzzy sets using a suitable membership function. any one experienced with this??? or have an Idea for my problem??

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• jquery: how to find an element which is comming 2 elements before current element

  - by erkan

  Hi guys... i have a markup which look like this: <h3>Paragraf3-dummytext</h3> <p> <a name="paragraf3"> Quisque id odio. Praesent venenatis metus at tortor pulvinar varius. Lorem ipsum dolor sit </a> </p> what i want to do is to find all 'a' tags with 'name' attribute and find the 'h3' tag for that anchor; im trying to do it like this: var paragraf = []; var paragrafheading = []; $('a[name]').each(function() { paragraf.push($(this).attr('name')); paragrafheading.push($(this).prev().text()); but it does not work becouse there is a 'p' tag around the text. Any suggestions would be appreciated. Thanks

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• Execute PHP without leaving page

  - by Dylan Taylor

  Okay. I have a form - textarea (named "su") and submit button. When the form is submitted, I need to run a PHP script without refreshing/leaving page "echo" or somehow print a return on the screen I'm pretty sure this works via some kind of ajax request thing. but I have no idea what I'm talking about. I'm not big on ajax or javascript, but this is a function i use very frequently and I'd like to learn how it works so I can implement it when i need to now and in the future. Like i said I'm uneducated with ajax or java. a quick example would be wonderful. thanks for taking the time to read!

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• Zend Framework: How to include an OR statement in an SQL fetchAll()

  - by Scoobler

  I am trying to build the following SQL statement: SELECT users_table.*, users_data.first_name, users_data.last_name FROM users_table INNER JOIN users_data ON users_table.id = user_id WHERE (users_table.username LIKE '%sc%') OR (users_data.first_name LIKE '%sc%') OR (users_data.last_name LIKE '%sc%') I have the following code at the moment: public function findAllUsersLike($like) { $select = $this-select(Zend_Db_Table::SELECT_WITH_FROM_PART)-setIntegrityCheck(false); $select-where('users_table.username LIKE ?', '%'.$like.'%'); $select-where('users_data.first_name LIKE ?', '%'.$like.'%'); $select-where('users_data.last_name LIKE ?', '%'.$like.'%'); $select-join('users_data', 'users_table.id = user_id', array('first_name', 'last_name')); return $this-fetchAll($select); } This is close, but not right as it uses AND to add the extra WHERE statements, instead of OR. Is there any way to do this as one select? Or should I perform 3 selects and combine the results (alot more overhead?)? P.S. The parameter $like that is past is sanitized so don't need to wory about user input in the code above!

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• Best strategy for HTML partial rendering based on multiple dropdown values

  - by pv2008

  I have a View that renders something like this: "Item 1" and "Item 2" are <tr> elements from a table. After the user change "Value 1" or "Value 2" I would like to call a Controller and put the result (some HTML snippet) in the div marked as "Result of...". I have some vague notions of JQuery. I know how to bind to the onchange event of the Select element, and call the $.ajax() function, for example. But I wonder if this can be achieved in a more efficient way in ASP.NET MVC2.

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• Marshal struct to unmanaged array

  - by Pedro

  Hi guys, I have a C# struct to represent a cartesian vector, something like this: public struct Vector { private double x; private double y; private double z; //Some properties/methods } Now I have an unmanaged C dll that I need to call with P/Invoke. Some methods expect a double[3] parameter. The unmanaged C signature is something like void Cross(double a[3], double b[3], double c[3]); Is there any way to set up a P/Invoke signature so I can pass instances of my Vector struct and marshal them transparently to unmanaged double[3]? I would also need bidirectional marshaling as the unmanaged function needs to write the output to the argument array, so I guess I would need to marshal as LpArray. Any ideas? Thanks Pedro

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• Characters problem in Bit.ly

  - by Fevos

  Hello, When i try to shorten a link with "#,&" Character i got an exception. is there a way to handle them . this is a sample of code that works String shortUrl = bitly.getShortUrl("http://z"); //Works but if i add for example '&' or '%25' to the string it will produce exption : - String shortUrl = bitly.getShortUrl("http://z%26"); // Exception - String shortUrl = bitly.getShortUrl("http://z&"); // Exception the getShortUrl function form this Java class: http://github.com/finnjohnsen/BitlyAndroid/raw/master/src/com/finnjohnsen/bitlyandroid/test/BitlyAndroid.java Thanks

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• jQuery ::: Does remove really remove?

  - by phpN00b

  I'm trying to remove a table row using jQuery, and while it disappears from the screen, and therefore, appears to work, in Firebug, I can still see the code for it. There are form elements in this row, and so, I want to understand whether the row is truly being deleted or not, because I wouldn't want those values submitted. So, does remove really remove? Below is the code I'm using... Maybe I'm doing it wrong? if($('.delete')) { $(".delete").live('click', function(event) { $(this).closest('tr').remove(); }); }

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• jQuery global variable best practice & options?

  - by Kris Krause

  Currently I am working on a legacy web page that uses a ton of javascript, jquery, microsoft client javascript, and other libraries. The bottom line - I cannot rewrite the entire page from scratch as the business cannot justify it. So... it is what it is. Anyway, I need to pollute (I really tried not too) the global namespace with a variable. There are the three options I was thinking - Just store/retrieve it using a normal javascript declaration - var x = 0; Utilize jQuery to store/retrieve the value in a DOM tag - $("body").data("x", 0); Utilize a hidden form field, and set/retrieve the value with jQuery - $("whatever").data("x", 0); What does everyone think? Is there a better way? I looked at the existing pile of code and I do not believe the variable can be scoped in a function.

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• call by value-result in Pascal

  - by Luciano Lorenti

  How can i simulate calling by value-result in this example. Without adding variables and without change a variable name.? Program one; var x:integer; Function two():integer; begin x:=x+1; dos:=x; end; Procedure three(x:integer); begin x:=x+5; x:=two(); end; begin x:=8; trhee(x); write(x); end.

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• Adding an item to an existent window

  - by farhad

  Hello! How can i add an item to an existent window? I tried win.add() but it does not seem to work. Why? This is my piece of code: function combo_service(winTitle,desc,input_param) { /* parametri */ param=input_param.split(","); /* della forma: param[0]="doc1:text", quindi da splittare di nuovo */ /* cosi' non la creo più volte */ win; if (!win) var win = new Ext.Window({ //title:Ext.get('page-title').dom.innerHTML renderTo:Ext.getBody() ,iconCls:'icon-bulb' ,width:420 ,height:240 ,title:winTitle ,border:false ,layout:'fit' ,items:[{ // form as the only item in window xtype:'form' ,labelWidth:60 ,html:desc ,frame:true ,items:[{ // textfield fieldLabel:desc ,xtype:'textfield' ,anchor:'-18' }] }] }); win.add({ // form as the only item in window xtype:'form' ,labelWidth:60 ,html:desc ,frame:true ,items:[{ // textfield fieldLabel:desc ,xtype:'textfield' ,anchor:'-18' }]}); win.show(); }; What's wrong with my code? Thank you very much.

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• Ruby on Rails Decryption

  - by user812120

  0 down vote favorite share [g+] share [fb] share [tw] The following function works perfect in PHP. How can it be translated in Ruby on Rails. Please note that both privateKey and iv are 32 characters long. mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $privateKey, base64_decode($enc), MCRYPT_MODE_CBC, $iv) I tried to use the following in Ruby but got a bad decrypt error. cipher = OpenSSL::Cipher.new('aes-256-cbc') cipher.decrypt cipher.key = privateKey cipher.iv = iv decrypted = '' << cipher.update(encrypted) << cipher.final

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• Is there a way to read what NSLog is writing from within the app?

  - by Jared P

  I have already tried stderr = stdout = fopen("/Users/Jared/Desktop/Untitled.txt", "w"); just as a test (obvi not production code) and this works fine for printf and some errors, but fails to redirect NSLog. I would like to be able to read what is being sent to NSLog as a string, and preferably prevent it from actually going into the system logs, although I don't particularly care if it has to. I need it to redirect logging from both my own code and apple's frameworks, which is why I can't just write a function that would append logs to a string. Thanks

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• jQuery plug-in with additional methods.

  - by Kieron

  I've a jQuery plug-in that operates on some ULs, adding and removing classes etc. During the life-cycle of the page, I'll need to add/ remove some classes in code, and as my plug-in needs to perform some additional operations when this happens I came up with the following: // This is the initialiser method... $.fn.objectBuilder = function (options) {...}; // These are the two new methods I need. $.fn.objectBuilder.setSelected(element) {...}; $.fn.objectBuilder.removeSelected() {...}; I'd then like to call them like this: $("#ob1").objectbuilder.removeSelected(); Any thoughts? Thanks, Kieron edit I suppose what I'm asking is, whats the best way of adding additional methods to a jQuery plug-in where it'll have access to the root object, in this case #obj when the method is called.

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• Trying to add AddThis to multiple items through JavaScript

  - by Mantorok

  I have to add an AddThis chunk to a bunch of controls, the reason I'm doing this through JS is because the addthis: attributes cause XHTML validation errors, so I wrote a JS script that takes the control I want to add the html into and some other bits: function AddExternalLinks(control, url, title) { $(control).html("<div class'addthis_toolbox addthis_default_style'><a class='addthis_button_facebook'" + " addthis:url=" + url + " addthis:title=" + title + " addthis:description=" + title + "></a>" + "<a class='addthis_button_twitter' " + " addthis:url=" + url + " addthis:title=" + title + " addthis:description=" + title + "></a></div>" + "<script type='text/javascript' src='http://s7.addthis.com/js/250/addthis_widget.js#username=cornwallweb'></script>"); However this does not work, the html is added fine but the script fails with the following error: *c._Queuer is not a constructor [Break on this error] if(!window._ate){var _atd="www.addthis...(c) 2008, 2009, 2010 Add This, LLC / addthi...wallweb (line 2) Any ideas? Thanks

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