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• Efficient 4x4 matrix inverse (affine transform)

  - by Budric

  Hi, I was hoping someone can point out an efficient formula for 4x4 affine matrix transform. Currently my code uses cofactor expansion and it allocates a temporary array for each cofactor. It's easy to read, but it's slower than it should be. Note, this isn't homework and I know how to work it out manually using 4x4 co-factor expansion, it's just a pain and not really an interesting problem for me. Also I've googled and came up with a few sites that give you the formula already (http://www.euclideanspace.com/maths/algebra/matrix/functions/inverse/fourD/index.htm). However this one could probably be optimized further by pre-computing some of the products. I'm sure someone came up with the "best" formula for this at one point or another? Thanks.

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• Is there a different between boost iostream mapped file and boost interprocess mapped file?

  - by Yijinsei

  hey guys, want to create a mapped binary file into memory, however I not sure how to create the file to mapped into the system. I read documentation several times and realize there is 2 mapped file, one in iostream and the other in interprocess. Do you guys have any idea on how to create a mapped file into shared memory. I trying to allow multi thread program to read an array of large double written in a binary file format. Also what is the different between the mapped file in iostream and interprocess?

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• Call named routes in CakePHP as the same way in Ruby on Rails

  - by Lucas Renan

  How can I call a route (in the view) in CakePHP as the same way in Rails? Ruby on Rails routes.rb map.my_route '/my-route', :controller => 'my_controller', :action => 'index' view link_to 'My Route Name', my_route_path CakePHP routes.php Router::connect('/my-route', array('controller' => 'my_controller', 'action' => 'index')); view $html->link('My Route Name', '/my-route'); But I think the Rails way is better, because I can make changes in the "url" and I don't need changes the code of the views.

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• PDO::fetchAll vs. PDO::fetch in a loop

  - by Byron

  Just a quick question. Is there any performance difference between using PDO::fetchAll() and PDO::fetch() in a loop (for large result sets)? I'm fetching into objects of a user-defined class, if that makes any difference. My initial uneducated assumption was that fetchAll might be faster because PDO can perform multiple operations in one statement while mysql_query can only execute one. However I have little knowledge of PDO's inner workings and the documentation doesn't say anything about this, and whether or not fetchAll() is simply a PHP-side loop dumped into an array. Any help?

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• Creating line graph/chart in vb.net (VS2008)

  - by typoknig

  I am reluctant to ask this question because a lot of similar questions have been asked, but after reading through them I am not getting the info I need. I am trying to follow this tutorial and I think it is going to work ok, but I have a lot of data to put in and the tutorial has the reader create the chart data points manually. I want the data points to be generated from an integer which can change while the program is running (thus the chart size needs to change) and the y coordinate of the data points needs to come from an array. I have attempted to "bind" the data but I am messing it up somehow and I don't even think that is the best way to do what I want. Also, I do not have to use the methods suggested in the tutorial, I am looking for the highest quality most efficient way to generate a line graph in vb.net (VS2008) based on the criteria I previously mentioned.

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• UIToolbar UIBarButtonItem Alignment question

  - by Luther Baker

  I need to create a UIToolbar that has two UIBarButtonItems. The 1st button must be centered and the 2nd item must be right aligned. I understand and use Flexible spacing and it works great when I need to balance buttons across the UIToolbar, but with only two buttons, I can't seem to perfectly center the middle button. I've even initialized the view.toolbarItems array with NSArray *items = [[NSArray alloc] initWithObjects:fixed, flex, center_button, flex, right_button, nil]; and set fixed.width = right_button.width ... but still, the center_button is never perfectly centered.

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• Time complexity of Sieve of Eratosthenes algorithm

  - by eSKay

  From Wikipedia: The complexity of the algorithm is O(n(logn)(loglogn)) bit operations. How do you arrive at that? That the complexity includes the loglogn term tells me that there is a sqrt(n) somewhere. Suppose I am running the sieve on the first 100 numbers (n = 100), assuming that marking the numbers as composite takes constant time (array implementation), the number of times we use mark_composite() would be something like n/2 + n/3 + n/5 + n/7 + ... + n/97 = O(n) And to find the next prime number (for example to jump to 7 after crossing out all the numbers that are multiples of 5), the number of operations would be O(n). So, the complexity would be O(n^2). Do you agree?

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• about Randomized-select algorithm

  - by matin1234

  Hi I have this array A = <3,2,9,0,7,5,4,8,6,1> and I want to write all its worst partitions are these correct?thanks a1 = <0,2,9,3,7,5,4,8,6,1> a2 = <1,9,3,7,5,4,8,6,2> a3 = <2,3,7,5,4,8,6,9> a4 = <3,7,5,4,8,6,9> a5 = <4,5,7,8,6,9> a6 = <5,7,8,6,9> a7 = <6,8,7,9> a8 = <7,8,9> a9 = <8,9> a10 = <9>

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• How to get image to pulse with opacity with JQuery

  - by Alex

  I am trying to get an image to change opacity smoothly over a duration of time. Here's the code I have for it. <script type="text/javascript"> pulsem(elementid){ var element = document.getElementById(elementid) jquery(element).pulse({opacity: [0,1]}, { duration: 100, // duration of EACH individual animation times: 3, // Will go three times through the pulse array [0,1] easing: 'linear', // easing function for each individual animation complete: function() { alert("I'm done pulsing!"); } }) </script> <a href="city.htm"><img src="waterloo.png" onmouseover="javascript:pulsem("waterloo")" border="0" class="env" id="waterloo"/></a> Also, is there a way for this to happen automatically without the need of a mouseover? Thanks.

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• dynamic insert php mysql and preformance

  - by Ross

  I have a folder/array of images, it may be 1, maximum of 12. What I need to do is dynamically add them so the images are added to an images table. At the moment I have $directory = "portfolio_images/$id/Thumbs/"; $images = glob("" . $directory . "*.jpg"); for ( $i= 0; $i <= count($images); $i += 1) { mysql_query("INSERT INTO project_images (image_name, project_id)VALUES ('$images[0]', '$id')") or die(mysql_error()); } this is fine but it does not feel right, how is this for performance? Is there a better way? The maximum number of images is only ever going to be 12. Thanks, Ross

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• Create a Generic IEnumerable<T> given a IEnumerable and the member datatypes

  - by ilias

  Hi, I get an IEnumerable which I know is a object array. I also know the datatype of the elements. Now I need to cast this to an IEnumerable<T, where T is a supplied type. For instance IEnumerable results = GetUsers(); IEnumerable<T> users = ConvertToTypedIEnumerable(results, typeof(User)); I now want to cast/ convert this to IEnumerable<User. Also, I want to be able to do this for any type. I cannot use IEnumerable.Cast<, because for that I have to know the type to cast it to at compile time, which I don't have. I get the type and the IEnumerable at runtime. - Thanks

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• Convert old NuSoap code into PHP core soap functions

  - by Enrique

  Hi I've been testing nuSoap with codeIgniter (PHP Framework) but seems nuSoap isn't prepared to work with latest php 5.3, even if I download a patched nusoap version for php 5.3 I have the following code: require_once(APPPATH.'libraries/NuSOAP/lib/nusoap'.EXT); //includes nusoap $n_params = array('CityName' => 'San Juan', 'CountryName' => 'Argentina'); $client = new nusoap_client('http://www.webservicex.net/globalweather.asmx?WSDL'); $client->setHTTPProxy("10.2.0.1",6588,"",""); $result = $client->call('GetWeather', $n_params); Can any1 help me to convert these functions into php soap functions? Including proxy function? Thanks a lot

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• Json.NET - How to serialize a class using custom resolver

  - by Mendy

  I want to serialize this class: public class CarDisplay { public string Name { get; set; } public string Brand { get; set; } public string Year { get; set; } public PictureDisplay[] Pictures { get; set; } } public class PictureDisplay { public int Id { get; set; } public string SecretKey { get; set; } public string AltText { get; set; } } To this Json test: { Name: "Name value", Brand: "Brand value", Year: "Year value", Pictures: ["url1", "url2", "url3"] } Note that each Car have an pictures array with only url string, instead of all the properties that Picture class have. I know that Json.NET have the notion of Custom Resolver, but I don't sure exactly how to use it.

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• Graphing new users by date in a Rails app using Seer

  - by Danger Angell

  I'd like to implement a rolling graph showing new users by day over the last 7 days using Seer. I've got Seer installed: http://www.idolhands.com/ruby-on-rails/gems-plugins-and-engines/graphing-for-ruby-on-rails-with-seer I'm struggling to get my brain around how to implement. I've got an array of the Users I want to plot: @users = User.all( :conditions = {:created_at = 7.days.ago..Time.zone.now}) Can't see the right way to implement the :data_method to roll them up by created_at date. Anyone done this or similar with Seer? Anyone smarter than me able to explain this after looking at the Seer sample page (linked above)?

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• Create a permalink with Javascript

  - by Jon Romero

  I have a textbox where a user puts a string like this: "hello world! I think that __i__ am awesome (yes I am!)" I need to create a correct url like this: hello-world-i-think-that-i-am-awesome-yes-i-am How can be done using reg expressions? Also, is it possible to do it with Greek (for example)? "Ge?a s?? ??sµe" turns to geia-sou-kosme In other programming languages (python/ruby) I am using a translation array. Should I do the same here?

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• How do I translate this Matlab bsxfun call to R?

  - by claytontstanley

  I would also (fingers crossed) like the solution to work with R Sparse Matrices in the Matrix package. >> A = [1,2,3,4,5] A = 1 2 3 4 5 >> B = [1;2;3;4;5] B = 1 2 3 4 5 >> bsxfun(@times, A, B) ans = 1 2 3 4 5 2 4 6 8 10 3 6 9 12 15 4 8 12 16 20 5 10 15 20 25 >> EDIT: I would like to do a matrix multiplication of these sparse vectors, and return a sparse array: > class(NRowSums) [1] "dsparseVector" attr(,"package") [1] "Matrix" > class(NColSums) [1] "dsparseVector" attr(,"package") [1] "Matrix" > NRowSums * NColSums (I think) w/o using a non-sparse variable to temporarily store data.

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• JNA-Mapping Delphi Function

  - by Florian

  Hi! How do i map this function with JNA: Delphi code: function getData(InData1: PChar; InData2: PChar; Data: TArray16; var OutData1: PChar; var OutData2: PChar): integer; stdcall; with: TArray16 = array[0..15] of char; The int value that is returned can be 0 for Error or 1 for right execution; My suggestion is: Java code: int getData(String inData1, String inData2, byte[] data, byte[] outData1 byte[] outData2); The problem is that the function of the dll returns 0. I also tried other Datatypes, but it hasn't worked jet. I think the problem is that the dll function can't write to the parameters outData1 and outData2. Who can help me?....Thanks!!

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• Get Members of Band

  - by user168083

  If I look at the Freebase page for the band '311', I see Chad Sexton listed. http://www.freebase.com/view/en/311 I am trying to query for the members of a band : { "name" : "311", "/music/artist/album" : [{"name":null, "id":null, "optional": true}], "type|=" : ["/music/artist","/music/musical_group"], "/award/award_winner/awards_won" : ["award":null, "optional" => true], "/award/award_nominated_work/award_nominations" : ["award":null, "optional" => true], "/music/artist/supporting_artists":[{}] } I thought supporting_artists would return the band member names, but the array is always empty. But if I query for all properties related to Chad Sexton, I don't see 311 mentioned. But he is listed as member on the Freebase web info page (which is correct). { "*": null, "name": "Chad Sexton", "type": "/music/artist" } How can I grab the band member names along with the band info?

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• Datamining on a mysql database

  - by sliptix

  Hello, I Begin with textmining. I have two database tables with thousands of data.. a table for "skills" and a table for "skills categories" every "skill" belongs to a skills categorie. a "skill" is , physicaly, a varchar(200) field in the database, where there is some text describing the skill. Here are some skills extracted from the skills table: "PHP (good level), Java (intermediaite), C++" "PHP5" "project management and quality management" "begining Javascript" "water engineering" "dfsdf zerze rzer" "cibling customers" what i want to do is to extract knowledge from those fields, i mean extract only the real skill and ignore the rest of useless text. for the above example i want to get only an array with: "PHP" "Java" "C++" "PHP5" "project management" "quality management" "Javascript" "water engineering" "cibling customers" what should i do to extract the skills from tons of data please ? do you know specific algorithms to do this ? ex : k-means ... ? Thanks in advance.

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• What is the C# equivalent of this Excel VBA code for Shapes?

  - by code4life

  This is the VBA code for an Excel template, which I'm trying to convert to C# in a VSTO project I'm working on. By the way, it's a VSTO add-in: Dim addedShapes() As Variant ReDim addedShapes(1) addedShapes(1) = aBracket.Name ReDim Preserve addedShapes(UBound(addedShapes) + 1) addedShapes(UBound(addedShapes)) = "unique2" Set tmpShape = Me.Shapes.Range(addedShapes).Group At this point, I'm stumped by the addedShapes(), not sure what this is all about. Update: Matti mentioned that addedShapes() represents a variant array in VBA. So now I'm wondering what the contents of addedShapes() should be. Would this be the correct way to call the Shapes.Range() call in C#? List<string> addedShapes = new List<string>(); ... Shape tmpShape = worksheet.Shapes.get_Range (addedShapes.Cast<object>().ToArray()).Group(); I'd appreciate anyone who's worked with VBA and C# willing to make a comment on my question & problem!

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• Winforms fixed single border on custom shaped control

  - by JD

  Hi all, I have created a custom control inheriting from a panel in .NET 3.5 The panel has a custom polygon border, which comes from a pointF array (In diagram, control is highlighted yellow). Fig 1 shows the control with BorderStyle none. Fig 2 with BorderStyle fixed-single As shown in Fig 2, the border follows the Rectangle bounding the control. IS there a way to make the border follow the actual border of the control set by the polygon? FYI the polygon is created using a GraphicsPath object. Drawing the line with GDI+ does not work, as the control clips the line and it looks awful... Fig1 Fig2

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• How Do You Insert Large Blobs Into Oracle 10G Using System.Data.OracleClient?

  - by discwiz

  Trying to insert 315K Gif files into an Oracle 10g database. Everytime I get this error "ora-01460: unimplemented or unreasonable conversion requested" whe I run the stored procedure. It appears that there is a 32K limit if I use a stored procedure. I read online that this does not apply if you are doing a direct insert, but I do not know how to create the insert string for a Byte Array. This is a thick client running on the server so not worried about SQL Injection attacks. Any help would be greatly appreciated. FYI, code in vb.net. Thanks, Dave

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• Suggestion for chkstk.asm stackoverfolw exception in C++ with Visual Studio 2010

  - by Gulshan

  I am working with an implementation of merge sort. I am doing C++ Visual Studio 2010. But when I took a array of 300000 integers for timing, it is showing an unhandled stackoverflow exception and taking me to a readonly file named "chkstk.asm". I reduced the size to 200000 and it worked. Again the same code worked with C-free 4 editor (mingw 2.95) without any problem while the size was 400000. Do you have any suggestion to get the code working in Visual Studio? May be the recursion in the mergesort is causing the problem.

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• java.net.SocketTimeoutException: Read timed out

  - by Rafael Soto

  Hi Folks, I have an application with client server architecture. The client use Java Web Start with Java Swing / AWT and the sert uses HTTP server / Servlet with Tomcat. The communication is made from the serialization of objects, create a ObjectOutput serializes a byte array and send to the server respectively called the ObjectInputStream and deserializes. The application follows communicating correctly to a certain time of concurrency where starting to show error "SocketException read timeout". The erro happens when the server invoke the method ObjectInputStream.getObject() in my servlet doPost method. The tomcat will come slow and the errors start to decrease server response time until the crash time where i must restart the server and after everything works. Someone went through this problem ?

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• Why does this JSON fail only in iPhone?

  - by 4thSpace

  I'm using the JSON framework from http://code.google.com/p/json-framework. The JSON below fails with this error: -JSONValue failed. Error trace is: ( Error Domain=org.brautaset.JSON.ErrorDomain Code=5 UserInfo=0x124a20 "Unescaped control character '0xd'", Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x11bc20 "Object value expected for key: Phone", Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x1ac6e0 "Expected value while parsing array" ) JSON being parsed: [{"id" :"2422","name" :"BusinessA","address" :"7100 U.S. 50","lat" :"38.342945","lng" :"-90.390701","CityId" :"11","StateId" :"38","CategoryId" :"1","Phone" :"(200) 200-2000","zip" :"00010"}] I think 0xd represents a carriage. When I put the above JSON in TextWrangler, I don't see any carriage returns. I got the JSON by doing "po myjson" in the debugger. It passes this validator: http://json.parser.online.fr/. Can anyone see what the problem may be?

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