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• How much overhead does a msg_send call incur?

  - by pxl

  I'm attempting to piece together and run a list of tasks put together by a user. These task lists can be hundreds or thousand of items long. From what I know, the easiest and most obvious way would be to build an array and then iterate through them: NSArray *arrayOfTasks = .... init and fill with thousands of tasks for (id *eachTask in arrayOfTasks) { if ( eachTask && [eachTask respondsToSelector:@selector(execute)] ) [eachTask execute]; } For a desktop, this may be no problem, but for an iphone or ipad, this may be a problem. Is this a good way to go about it, or is there a faster way to accomplish the same thing? The reason why I'm asking about how much overhead a msg_send occurs is that I could also do a straight C implementation as well. For example, I could put together a linked list and use a block to handle the next task. Will I gain anything from that or is it really more trouble than its worth?

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• best way to save data in ipod touch/iphone objective-c

  - by Leonardo

  Hi all, I am writing a very simple application, for iphone. Unfortunately I am really a newbie. What I am trying to do is to save data at the end of a user experience. These data are really simple, only string or int, or some array. Later I want to be able to retrieve that data, therefore I also need an event id (I suppose). Could you please point out the best way, api or technology to achieve that, xml, plain text, serialization... ? many thanks Leonardo

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• php-curl script that saves images---actually captcha images

  - by user253530

  I have a curl class, called Curl. Let's presume i have this code: $url = 'http://www.google.com' $fields = array('q'=>'search term'); //maybe some other arguments. but let's keep it simple. $curl = new Curl(); $page = $curl->post($url,$fields); $page will have some images wich curl doesn't load them by default. I need to know how i can save a specific image without using curl. Once I use $page = $curl-post(..) I need to know how I can have that image saved without using another $curl-post(_image_location_) to get that file. The reason why need this is to save a captcha image from a form. I need to access the form and get that specific image that's being loaded. If i try to access the URL of the image, it will be a different captcha image.

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• Best Geocoding Service for iPhone Developers

  - by ckrames1234

  I have made an app that gets an array of addresses from a web service and I want to map them. I know Apple left this out in MapKit, including only a reverse GeoCoder. I was wondering what the best way to approach this problem was. Web Service? Google Maps API (How do API keys work?)? CloudMade? What is your opinions on which service is fastest, easiest to use, and cheapest (hopefully free)? Thanks, Conrad Kramer

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• Mustache.js render technique

  - by PanosJee

  Hello everyone, i am trying to use mustache.js to render some JSON in the browser. What i want to do is: <li> <span class="label">Location: </span> {{#locations}} {{.}}<span class="social-small-size "></span> {{/locations}} </li> The locations is a js array [["Pendéli, Attiki, Greece", "facebook"], ["Greece", "linkedin"]] Initially i tried to use {{%IMPLICIT-ITERATOR iterator=loc}} in my attempt to split the data in the view. So i the actual rendering code was {{loc[0]}}<span class="social-small-size {{loc[1}}"></span> But that did n t work altough the loop worked and i got 2 spans but without any content. I think the PRAGMA is what I need but I didn 't figure it out. Any hints ? :)

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• C# - Can FileHelper FieldConverter routines refer to other fields in the record?

  - by Pete

  I am using the excellent FileHelpers library to process a fixed-length airline schedule file. I have a date field, then a few fields later on in the record, a time field. I want to combine both of these in the FileHelpers record class, and know there is a custom FieldConverter attribute. With this attribute, you provide a custom function to handle your field data and implement StringToField and FieldToString. My question is: can I pass other fields (already read) to this customer FieldConverter too, so I can combine Date and Time together. FieldConverter has an implementation that allows you to refer to both a custom processing class AND 'other strings' or even an array of object. But, given this is done in the attribute definition, I am struggling to access this earlier-field reference. [FieldFixedLength(4)] [FieldConverter(typeof(MyTimeConverter),"eg. ScheduledDepartureDate")] public DateTime scheduledDepartureTime;

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• Posting XML via curl (command-line) without using key/value pairs

  - by Mathias Bynens

  Consider a PHP script that outputs all POST data, as follows: <?php var_dump($_POST); ?> The script is located at http://example.com/foo.php. Now, I want to post XML data to it (without using key/value pairs) using command line curl. I have tried many variations of the following: curl -H "Content-type: text/xml; charset=utf-8" --data-urlencode "<foo><bar>bazinga</foo></bar>" http://example.com/foo.php Yet none of them seem to actually post anything — according to the PHP script, $_POST is just an empty array. What am I doing wrong here?

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• Silverlight 4 - authentiation / authorization against custom wcf service

  - by Calanus

  I have a wcf service in front of an AzMan store that passes roles and operations to clients using the following interface: [OperationContract] bool AuthenticateUser(string password, string appName); [OperationContract] string[] GetRoles(string storelocation, string appName); [OperationContract] string[] GetOperations(string storeLocation, string appName, string selectedRole); Clients connect to this service using windows authentication (but users must send their password through to reaffirm their identity). Ultimately the service delivers an array of operations that each client can perform based on their selected role. I've opened a new Silverlight Business Application and tried to understand how authentication/authorization works in this template, as well as scoured the web to find examples to how to hook my webservice to the login box already created in the template, but I am completely at a loss as how to do this! Can anyone offer any advice?

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• MPI_SCATTER Fortran Matrices by Rows

  - by Fortran

  What is the best way to scatter a Fortran 90 matrix by its rows rather than columns? That is, let's say I have a matrix a(4,50) and I want to MPI_SCATTER it onto two processes where each part is alocal(2,50), where rank 0 has rows 1 and 2, and rank 1 has 3 and 4. Now, in C, this is simple since arrays are row-major, but in Fortran 90 they are column-major. I'm trying to avoid using TRANSPOSE to flip a before scattering (i.e, doubling the memory use), and I figure there must be a way in MPI to do this. Would it be MPI_TYPE_VECTOR? MPI_TYPE_CREATE_SUBARRAY? Likewise, what if I have a 3d array b(4,50,3) and I want two scattered matrices of blocal(2,50,3) distributed as above?

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• access following entry in a form_for, and switch a value between two entry of my DB

  - by Sylario

  I am displaying a list of articles. I sort my articles by the param order, and i want, when displaying the list of article to be able to "move" them up or down. In php i do everything with a for browsing my array of results and inside the for i go to the next index to find where i am in the list, and with wich other article i must swap my order. I can do that in the script displaying the edit page and then in the script executing the update. In rails i have only my form_for in my erb. How can i : Know if my entry is the last one or the first one(display only V for the first, ^ for the last and V^ for the rest) Update my DB entry by switching the order value between the article that i want to lower, raise, and the one he is taking the place.

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• Dynamic attributes with Rails and Mongoid

  - by japancheese

  Hello, I'm learning MongoDB through the Mongoid Ruby gem with Rails (Rails 3 beta 3), and I'm trying to come up with a way to create dynamic attributes on a model based on fields from another model, which I thought a schema-less database would be a good choice for. So for example, I'd have the models: class Account include Mongoid::Document field :name, :type => String field :token, :type => String field :info_needed, :type => Array embeds_many :members end class Member include Mongoid::Document embedded_in :account, :inverse_of => :members end I'm looking to take the "info_needed" attribute of the Account model and created dynamic attributes on the Member model based on what's inside. If club.info_needed was ["first_name", "last_name"], I'm trying to create a form that would save first_name and last_name attributes to the Member model. However, upon practice, I just keep getting "undefined method first_name=" errors on the Member model when trying to do this. I know MongoDB can handle dynamic attributes per record, but how can I get Mongoid to do this without an undefined method error?

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• PHP Server did not recognize the value of HTTP Header SOAPAction

  - by Joe

  I am making my first SOAPclient and I am stuck with the Headers, I am getting a response and when I look at my request it has a soap:body but no soap:headers. The web service has needs 3 parameters 1.UserName 2.Password 3.errorMessage This is the code I have set up. $SOAPAction = 'http://localhost/DriveAwayPriceCalculation/PriceCalculation'; //Namespace of the WS. // $SoapHeaders = array('User123' => $UserName, 'Password123' => $Password, '' => $errorMessage); $client = new nusoap_client("https://test.com/CalculationWS.asmx?WSDL", false, $UserName, $Password, $errorMessage); $headers = new SoapHeader('http://localhost/DriveAwayPriceCalculation/PriceCalculation', true, $SoapHeaders); As I said I am just starting out in SOAP (and PHP) so if you could help, it would be great. Thanks

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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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