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• What is the most useful R trick?

  - by Dirk Eddelbuettel

  In order to share some more tips and tricks for R, what is you single-most useful feature or trick? Clever vectorization? Data input/output? Visualization and graphics? Statistical analysis? Special functions? The interactive environment itself? One item per post, and we will see if we get a winner by means of votes. [Edit 25-Aug 2008]: So after one week, it seems that the simple str() won the poll. As I like to recommend that one myself, it is an easy answer to accept.

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• Using javascript to access a json array from php

  - by celenius

  I'm trying to understand how my php script can pass an array to my javascript code. Using the following php, I pass an array: $c = array(3,2,7); echo json_encode($c); My javascript is as follows: $.post("getLatLong.php", { latitude: 500000}, function(data){ arrayData = data document.write(arrayData) document.write(arrayData[0]); document.write(arrayData[0]); document.write(arrayData[0]); }); </script> What is printed out on screen is [3,2,7][3, I'm trying to understand how json_encode works - I though I would be able to pass the array to a variable, and then access it like a normal javascript array, but it views my array as one large text string. How do ensure that it reads it like an array?

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• What was that tutorial on pointers?

  - by pecker

  Hello, I once read a tutorial/article on Pointers somewhere. It was not a general tutorial but it explained how to clearly understand the complex & confusing pointers (especially like the ones that are usually asked in interview). It was more like http://www.codeweblog.com/right-left-rule-complex-pointer-analysis/ I'm unable to find it. Could any one post it here. PS: I did tried to google it but couldn't find. I'm asking it here because I thought it was popular.

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• Wordpress Database SQL query help needed

  - by i-CONICA

  Hi, I've written a PHP script to access the latest item from the wordpress database, which it does. But I need to use it twice, once for the latest item from a specific category, and another from a differerent category... But right now I cannot figure out how to put the query together. The post has a post_parent, which in another table, called wp_term_relationships, is referred to as object_id, and has a term_taxonomy_id, which then relates to a different table, called wp_terms where the term_taxonomy_id is now term_id and then you have the category slug name available to select... I really cannot understand how this query would work though. I've made a really crap mock up of it, to try to "visually" explain what i'm trying to do... SELECT * FROM wp_posts WHERE post_status = 'publish' AND (SELECT term_taxonomy_id FROM wp_term_relationships WHERE object_id = post_parent) AND (SELECT slug FROM wp_terms WHERE term_id = term_taxonomy_id) ORDER BY ID DESC LIMIT 1 Really would appreciate some help... Thanks.

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• why do i lose my hidden field value?

  - by user517406

  Hi, I have some hidden fields on my page, all of which work fine apart from one. I am setting the value in document.ready, before calling buildGrid() : $(document).ready(function() { $.ajax( { type: "POST", url: "/CDServices.asmx/GetWeekEndingDates", data: "{}", dataType: "json", contentType: "application/json; charset=utf-8", success: function(msg) { //store default dates in hidden fields $("#<%=hdnCurrentDate.ClientID%>").val(msg.d.CurrentDate); $("#<%=hdnLastWeekEndingDate.ClientID%>").val(msg.d.LastWeekEndingDate); } }); buildGrid(); }); Yet in buildGrid, the value in the hidden field is empty : function buildGrid() { alert($("#<%=hdnLastWeekEndingDate.ClientID%>").val()); I call other functions on button clicks where the hidden field value is picked up fine, why does the value disappear here?

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• Handling input from a keyboard wedge

  - by JDibble

  Following on from the question asked by Mykroft Best way to handle input from a keyboard “wedge” http://stackoverflow.com/questions/42437/best-way-to-handle-input-from-a-keyboard-wedge. I need to write a class that intercepts key strokes, if the input is determined to be from the keyboard wedge (as described in the above post) the data will be directed to POS classes to handle, otherwise they keystrokes must be passed on to be handled in windows in the normal manner. This raises two questions How can I intercept key strokes when not in a WinForm. How can I pass on the keypresses to windows. Thanks JDibble

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• button in the form cause it be submitted automatically

  - by Spiderman

  has the HTML version changed lately (like from ie7 to IE8?) I notice the following change that cause me some troulbe - I am having a code that is similar to this: <form method="POST" action="/admin/modify"> <input type="text"/> <button onclick="dosomething()">Press</button> </form> <script type="text/javascript"> function doSomething(){ // doesn't matter what actually } </script> What is weired to me in this code is that by pressing the button inside the form, all I want is to perform some javascript action but eventaully it causes the form to be submitted too, even when I am not willing to do it. So - is it true? and if so how can I perform some java script actoin inside a from but prevent the form from being submitted automatically?

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• Problem with large Canvas in Silverlight

  - by Fury

  Hi, I am developing (using Silvelight 3) an aplication that creates some kind of timeline and places objects on it. For this purpose I need a really large Canvas (up to 2000000 pixels width) with long lines on it, but whenever I create Canvas even 40000 pixels width it behaves very strangely, randomly disappearing. I have found a post with the description of the exactly same problem on silverlight forums and another one here on the stackoverflow. It seems that is a known problem since silverlight 2, but I can't find any good workaround. Does anybody know such workaround or can check is it still an issue in Silverlight 4? Thanks in advance.

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• Monitoring Reasoning Progress using the Pellet Reasoner

  - by Nico

  I am currently constructing an OWL ontology, which - until very recently classified rapidly using the Pellet reasoner. However, since the introduction of several new classes, the reasoning performance has slowed to a crawl. Although the reasoner completes and the ontology does not contain any unsatisfiable concepts etc, the time the reasoning takes is unacceptable. I am currently trying to track down the offending classes/class that may have led to the slowdown. Here's my question: is it possible to log the reasoning progreess of Pellet? I.e. is it possible to produce some output that will document how long pellet has spent on certain reasoning tasks/traces how long reasoning over any given class and axiom takes? If so, does anyone have some java code they could post up? Thanks in advance for your answers!

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• Standard (cross-platform) way for bit manipulation

  - by Kiril Kirov

  As are are different binary representation of the numbers (for example, take big/little endian), is this cross-platform: some_unsigned_type variable = some_number; // set n-th bit, starting from 1, // right-to-left (least significant-to most significant) variable |= ( 1 << ( n - 1 ) ); // clear the same bit: variable &= ~( 1 << ( n - 1 ) ); In other words, does the compiler always take care of the different binary representation of the unsigned numbers, or it's platform-specific? And what if variable is signed integral type (for example, int) and its value is zero positive negative? What does the Standard say about this? P.S. And, yes, I'm interesting in both - C and C++, please don't tell me they are different languages, because I know this :) I can paste real example, if needed, but the post will become too long

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• What could be adding "Pragma:no-cache" to my response Headers? (Apache, PHP)

  - by Daniel Magliola

  I have a website whose maintenance I've inherited, which is a big hairy mess. One of the things i'm doing is improving performance. Among other things, I'm adding Expires headers to images. Now, there are some images that are served through a PHP file, and I notice that they do have the Expires header, but they also get loaded every time. Looking at Response Headers, I see this: Expires Wed, 15 Jun 2011 18:11:55 GMT Cache-Control no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma no-cache Which obviously explains the problem. Now, i've looked all over the code base, and it doesn't say "pragma" anywhere. .htaccess doesn't seem to have anything related either. Any ideas who could be setting those "pragma" (and "cache-control") headers, and how I can avoid it? Thanks! Daniel

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• Codeigniter form action with slashes instead of normal GETs?

  - by Ethan

  Hey, so this is one of those questions that seems obvious, and I'm probably going to feel stupid, but here goes: I'm doing a CodeIgniter site with a search. Think of a Google type input, where you'd search for "white huskies." I have a search results page that takes a URI (MySite.com/dogs/white huskies), and takes the third part, and performs the search on that term. I'd like this to be done in the URI, and no by POST so my users can bookmark results. The problem I'm having is how to get that search button directed to Mysite.com/dogs/WHATEVER IS IN THE INPUT. How do I get the what is in the input part into the anchor href? I know I could do this with javascript, but I've heard it's bad practice to force people to have javascript for things this small. Thanks for the help!

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• How to enable reading non-ascii characters in Servlets

  - by Daziplqa

  How to make the servlet accept non-ascii (Arabian, chines, etc) characters passed from JSPs? I've tried to add the following to top of JSPs: <%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> And to add the following in each post/get method in the servlet: request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); I've tried to add a Filter that executes the above two statements instead of in the servlet. To be quite honest, these was working in the past, but now it doesn't work anymore. I am using tomcat 5.0.28/6.x.x on JDK1.6 on both Win & Linux boxes.

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• IO redirect engine with metadata

  - by hawk.hsieh

  Is there any C library or tool to redirect IO and be able to configured by a metadata. And provide a dynamic link library to perform custom process for feeding data into next IO. For example, network video recorder: record video: socket do_something() file preview video: socket do_something() PCI device http service: download file: socket do_something(http) file socket post file: socket do_something(http) file serial control: monitor device: uart do_something(custom protocol) popen("zip") socket I know the unix-like OS has IO redirect feature and integrate all application you want. Even socket IO you can use /dev/tcp or implement a process to redirect to stdout. But this is process based , the process's foot print is big , IPC is heavy. Therefore, I am looking for something to redirect IO in a process and the data redirect between IO is configurable with a metadata (XML,jason or others).

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• Why function callback of Connection is not handled with Yahoo UI ?

  - by quilovnic

  I use Yahoo UI with Grails (so grailsui) and I try to upload a file with Ajax and get a JSON response from the server : The response is correctly returned by my controller but a popup is displayed to save the file but it's not a file it's a JSON result. My Yahoo Code is : callback = { success: function(o){alert('success');}, failure: function(o){alert('failure');} } YAHOO.util.Connect.asyncRequest('POST', '/my/url', callback); The http response is the JSON result. What's hell is wrong ? Why does I have dialog box to download the file ? Thanks a lot.

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• stumped on jquery call inside chrome extension

  - by phil swenson

  In my chrome extension I call this: jsonPost = { email:"[email protected]", password:"demo", content: $('#selected_text').val(), notification_type: $('#notification_type').val(), name:$('#notification_name').val() } $.post('http://localhost:3000/api/create.json', jsonPost, function (data) { console.log("type of data = " + typeof(data)); console.log("data in function = " + data); } The data makes it to the server. But the response is lost, in the console ---type of data = String ---data in function = So for some reason I am not getting the response back. Works from the browser. I even tried doing a get against cnn.com and got no response. any ideas? thanks

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• Posting Documentation onto a Joomla Site

  - by Chris Spicer

  I would like to create some documentation and post it onto my Joomla website. This documentation would be something along the lines of the MSDN documentation: i.e. each page would follow a basic template. Intuitively I feel I have two ways of achieving this: 1) Creating each page of documentation as a separate article, and then linking them up. 2) Creating some kind of template and filling the information from a database. The second option being preferable in the long run. Unforunately I have no idea how to achieve what I'm looking for. I hoped that there would be a component out there that woud help me, but Googling for 'Joomla Documentation' just brings up the documentation for Joomla itself. Has anyone out there put documentation on their site, and how did they achieve it?

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• simple form validation in dancer/perl

  - by devnull

  I am trying to do a simple form validation in perl dancer but I was wondering what would be the best way to validate simple parameters (e.g. field cannot be empty, validity of the email, minimum length of a field) in dancer/perl without any extra plugin or CPAN module here is the code so far post '/register' => sub { my $db = connect_db(); my $sql = 'insert into users (username, email, password, motivation) values (?, ?, ? ,?)'; my $sth = $db->prepare($sql) or die $db->errstr; $sth->execute(params->{'username'}, params->{'email'},params->{'password'}, params->{'motivation'}) or die $sth->errstr; set_flash('Hey you signed up !'); redirect '/thanks'; }; I did google it and I found several ways to do validation using CPAN modules like Form::Foo but how do it without that ?

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• ASP.NET MVC: View does not get rendered with updated model value

  - by Newton

  I'm experiencing the a challenge in populating the child records. My previous code was like - <%= Html.TextBox("DyeOrder.Summary[" + i + "].Ratio", Model.DyeOrder.Summary[i].Ratio.ToString("#0.00"), ratioProperties) %> This code does not render the updated values after post back. To resolve this issue my work around was like - <%= "<input id='DyeOrder_Summary_" + i + "__Ratio' name='DyeOrder.Summary[" + i + "].Ratio' value='" + Model.DyeOrder.Summary[i].Ratio.ToString("#0.00") + "' " + ratioCss + " type='text' />"%> This is very clumsy to me. Is there any better ideas...

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• How do I unhide a CFDIV that has dynamic content with AJAX binding itself?

  - by Eric Belair

  I have the following CFSELECT tags that are used to populate a text input: <cfselect id="this" name="this" bind="cfc:Data.getThis()" bindonload="true" /> <cfselect id="that" name="that" bind="cfc:Data.getThat({p1})" /> <cfselect id="theOther" name="theOther" bind="cfc:Data.getTheOther({p1}, {p2})" /> The text input is the only value that needs to be submitted in a form: <cfform name="addItem" method="post" action="somepage.cfm"> <cfinput type="text" id="item" name="item" bind="cfc:Data.getResult({this}, {that}, {theOther})" /><br /> <cfinput type="submit" name="addButton" value="Add Item" /> </cfform> I want the form and it's contents to be visible only when all three selections have been made, and there is a value for the text input. What is the best way to do this? I'm assuming some use of CFDIV is the best way, but I'm not sure how to load the dynamic content (the CFINPUTs) this way.

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• Qt applications on new Mac App Store

  - by PDI

  I have a Qt app that runs on OS X that has potential to go on the new Mac App Store. I have reviewed the guidelines at https://developer.apple.com/appstore/mac/resources/approval/guidelines.html. I also saw a post here on SO about Java and the AppStore. Has anyone else considered this with their own apps and whether or not the Qt framework will run afoul of the App police? You still have to stay within the Apple HIG, i.e. no theming and cannot use private APIs. Still seems like a risky proposition over pure ObjC. Anyone else tempted?

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• Unable to locate the Bug

  - by tzenes

  I was recently on The Daily WTF when I came across this old post. In it the author mentions that one of the programmers changed this code: int main (int argc, char **argv) { int x; char data_string[15]; ... x = 2; strcpy(data_string,"data data data"); ... } To this code: int main (int argc, char **argv) { int x = 2; char data_string[15] = "data data data"; ... } The author goes on to mention: [the coder] changed every single variable to be initiated on the stack For the life of me I cannot see how this change could be harmful, and I am worried that it is a lapse in my C knowledge. What is the WTF?

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• Best practice for partial updates in a RESTful service

  - by magiconair

  I am writing a RESTful service for a customer management system and I am trying to find the best practice for updating records partially. For example, I want the caller to be able to read the full record with a GET request. But for updating it only certain operations on the record are allowed, like change the status from ENABLED to DISABLED. (I have more complex scenarios than this) I don't want the caller to submit the entire record with just the updated field for security reasons (it also feels like overkill). Is there a recommended way of constructing the URIs? Do I use GET, POST, PUT or is there no agreed way of doing these kind of things? When reading the REST books RPC style calls seem to be frowned upon. Thanks Frank

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• What port is my SQL2008 instance running on?

  - by George

  Check out this pic of my SQL 2008 Management Configuration screen for TCP: I need to know what port I am running on. Base on this previous post, I don't believe that it is 1433, which I guess is the default. When I check my port number in SQL Config Mgr., it is blank. Does this suggest a default port? Note that I have multiple SQL Server instance on the db server. 1 2000 instance and two 2008 instances. I want to know the port of the 2008b instance. Can you help?

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• How can I implement a jquery ajax form which requests information from a web api via a php request?

  - by Jacob Schweitzer

  I'm trying to implement a simple api request to the SEOmoz linkscape api. It works if I only use the php file but I want to do an ajax request using jquery to make it faster and more user friendly. Here is the javascript code I'm trying to use: $(document).ready(function(){ $('#submit').click(function() { var url=$('#url').val(); $.ajax({ type: "POST", url: "api_sample.php", data: url, cache: false, success: function(html){ $("#results").append(html); } }); }); }); And here is the part of the php file where it takes the value: $objectURL = $_POST['url']; I've been working on it all day and can't seem to find the answer... I know the php code works as it returns a valid json object and displays correctly when I do it that way. I just can't get the ajax to show anything at all!!

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