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  • Faster way to compare two sets of points in N-dimensional space?

    - by Amit
    List1 contains a high number (~7^10) of N-dimensional points (N <=10), List2 contains the same or fewer number of N-dimensional points (N <=10). My task is this: I want to check which point in List2 is closest (euclidean distance) to a point in List1 for every point in List1 and subsequently perform some operation on it. I have been doing it the simple- the nested loop way when I didn't have more than 50 points in List1, but with 7^10 points, this obviously takes up a lot of time. What is the fastest way to do this? Any concepts from Computational Geometry might help?

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  • Can we use union of two sqlite databases with same tables for Core Data?

    - by Tofrizer
    Hi All, I have an iPhone Core Data app with a pre-populated sqlite "baseline" database. Can I add a second smaller sqlite database with the same tables as my pre-populated "baseline" database but with additional / complementary data such that Core Data will happily union the data from both databases and, ultimately, present to me as if it was all a single data source? Idea that I had is: 1) the "baseline" database never changes. 2) I can download the smaller "complementary" sqlite database for additional data as and when I need to (I'm assuming downloading sqlite database is allowed, please comment if otherwise). 3) Core Data is then able to union data from 1 & 2. I can then reference this unified data by calling my defined Core Data managed object model. Hope this makes sense. Thanks in advance.

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  • Can I have two names for the same variable?

    - by Roman
    The short version of the question: I do: x = y. Then I change x, and y is unchanged. What I want is to "bind" x and y in such a way that I change y whenever I change x. The extended version (with some details): I wrote a class ("first" class) which generates objects of another class ("second" class). In more details, every object of the second class has a name as a unique identifier. I call a static method of the first class with a name of the object from the second class. The first class checks if such an object was already generated (if it is present in the static HashMap of the first class). If it is already there, it is returned. If it is not yet there, it is created, added to the HashMap and returned. And then I have the following problem. At some stage of my program, I take an object with a specific name from the HashMap of the first class. I do something with this object (for example change values of some fields). But the object in the HashMap does not see these changes! So, in fact, I do not "take" an object from the HashMap, I "create a copy" of this object and this is what I would like to avoid.

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  • IE6 forces Two clicks to trigger javascript style=display:inline; event

    - by JiminyCricket
    I have a web form that has 2 radio buttons, depending on which one is clicked it displays a hidden element This works fine in all browsers except for IE6, which, after I click on the radio button, I have to click again (anywhere on the window) and then the element is displayed...has anyone had behavior like this before? I tried to not use jQuery and do straight getElementById() but I get the same behavior... JSCRiPT function showHidden(divid) { $('#'+divid).css( {'display':'inline'} ); } HTML <input type=radio name=borp value=1 onChange='showHidden("brandchecks")' > Brand <input type=radio name=borp value=2 onChange='showHidden("productchecks")' > Product <div id='brandchecks' style='display:none;'> Blah </div> <div id='productchecks' style='display:none;'> Blah </div>

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  • in c# ,one array of class and two connected instance of it why ?

    - by Al0NE
    Hi I wrote the code below : 1. MyClass[] origArr=new MyClass[3]; 2. MyClass[] arr1; 3. // filled the array with objects and did some work on it . 4. dgv_1.DataSource=origArr; 5. 6. // Here is the problem : 7. arr1=origArr; 8. // do some work on arr1 ... 9. dgv_2.DataSource=arr1; For some reason the data in 'origArr' changed when data in 'arr1' change ... I thought that maybe this happened because 'origArr' and 'arr1' are pointers referring to the same object so I changed line '7' to : 7. origArr.CopyTo(arr1,0); but it didn't work ... what can i do to make the pointers referring to different objects?

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  • How to set an ImageView and two TextviewS to have the same height?

    - by M.ES
    I've got the following layout with one ImageView and 2 TextView, I would like them all to have the same height. However, the ImageView is always taking more than half of the screen. Any help is highly apreciated. Here is the layout: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFFFFF" android:orientation="vertical" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="0.4" android:src="@drawable/sprint" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="0.3" android:background="#555555" android:text="@string/hello" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.3" android:text="@string/hello" /> </LinearLayout>

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  • Percentage difference between different values in the same keys of two different arrays.

    - by Paul
    Hey. I'm looking for a solution to this problem. I got 2 arrays, like this: array(2) { [20100526]=> array(1) { ["ga:pageviews"]=> string(5) "19088" } [20100527]=> array(1) { ["ga:pageviews"]=> string(5) "15566" } } array(2) { [20100526]=> array(1) { ["ga:pageviews"]=> string(5) "12043" } [20100527]=> array(1) { ["ga:pageviews"]=> string(5) "11953" } } Now I'd like to create a new array, with the % difference between the values per key. Would be something like this: array(2) { [20100526]=> array(1) { ["ga:pageviews"]=> string(5) "88,23" } [20100527]=> array(1) { ["ga:pageviews"]=> string(5) "74,54" } } Can anyone help me how to create that array?

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  • What is the easiest to transfer an object between two C# apps over the web?

    - by edude05
    I have written an application that basically gathers up a bunch of text and numerical data from the client PC and stores it as an object. Right now I'm implementing XML serialization so that the file can be saved. The issue is now, how do I get this data to the server? I have a server running IIS 7 setup but I don't quite understand the ASP.net life cycle, so I'm not sure how to implement the receiving app. What should I do? Thanks

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  • What's the best/easiest way to compare two times in Objective-C?

    - by Andy
    I've got a string representation of a time, like "11:13 AM." This was produced using an NSDateFormatter and the stringFromDate: method. I'd like to compare this time to the current time, but when I use the dateFromString: method to turn the string back into a date, a year, month and day are added - which I don't want. I just need to know if right now is < or the time stored in the string. What's going to be the best way to handle that? Thanks in advance for your help.

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  • How to find kth minimal element in the union of two sorted arrays?

    - by Michael
    This is a homework question. They say it takes O(logN + logM) where N and M are the arrays lengths. Let's name the arrays a and b. Obviously we can ignore all a[i] and b[i] where i k. First let's compare a[k/2] and b[k/2]. Let b[k/2] a[k/2]. Therefore we can discard also all b[i], where i k/2. Now we have all a[i], where i < k and all b[i], where i < k/2 to find the answer. What is the next step?

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  • Drupal - how to add add same page to two menus?

    - by bert
    How can I add same callback to 2 different menus? function my_callback_menu(){ $items = array(); $items['my_callback'] = array( 'title' => t('My title'), 'menu_name' => 'menu-my-menu', 'page callback' => 'my_callback', 'access arguments' => array('access content'), ); return $items; }

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  • Best ways to write a method that updates two objects in a multithreaded java environment?

    - by DanielHonig
    Suppose we have a class called AccountService that manages the state of accounts. AccountService is defined as interface AccountService{ public void debit(account); public void credit(account); public void transfer(Account account, Account account1); } Given this definition, what is the best way to implement transfer() so that you can guarantee that transfer is an atomic operation. I'm interested in answers that reference Java 1.4 code as well as answers that might use resources from java.util.concurrent in Java 5

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  • PHP resized image functions and S3 upload functions - but how to merge the two?

    - by chocolatecoco
    I am using S3 to store images and I am resizing and compressing images before it gets uploaded using PHP. I'm using this class for storing the images to an S3 bucket - http://undesigned.org.za/2007/10/22/amazon-s3-php-class This all works fine if I'm not doing any file processing before the file is uploaded because it reads the file upload from the $_FILES array. The problem is I am resizing and compressing the image before storing to the S3 bucket. So I'm no longer able to read from the $_FILES array. The functions for resizing: public function resizeImage($newWidth, $newHeight, $option="auto") { // *** Get optimal width and height - based on $option $optionArray = $this->getDimensions($newWidth, $newHeight, $option); $optimalWidth = $optionArray['optimalWidth']; $optimalHeight = $optionArray['optimalHeight']; // *** Resample - create image canvas of x, y size $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight); imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height); // *** if option is 'crop', then crop too if ($option == 'crop') { $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight); } } The script I am using to store the file after resizing and compressing to a local directory: public function saveImage($savePath, $imageQuality="100") { // *** Get extension $extension = strrchr($savePath, '.'); $extension = strtolower($extension); switch($extension) { case '.jpg': case '.jpeg': if (imagetypes() & IMG_JPG) { imagejpeg($this->imageResized, $savePath, $imageQuality); } break; case '.gif': if (imagetypes() & IMG_GIF) { imagegif($this->imageResized, $savePath); } break; case '.png': // *** Scale quality from 0-100 to 0-9 $scaleQuality = round(($imageQuality/100) * 9); // *** Invert quality setting as 0 is best, not 9 $invertScaleQuality = 9 - $scaleQuality; if (imagetypes() & IMG_PNG) { imagepng($this->imageResized, $savePath, $invertScaleQuality); } break; // ... etc default: // *** No extension - No save. break; } imagedestroy($this->imageResized); } with this PHP code to invoke it: $resizeObj = new resize("$images_dir/$filename"); $resizeObj -> resizeImage($thumbnail_width, $thumbnail_height, 'crop'); $resizeObj -> saveImage($images_dir."/tb_".$filename, 90); How do I modify the code above so I can pass it through this function: $s3->putObjectFile($thefile, "s3bucket", $s3directory, S3::ACL_PUBLIC_READ)

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  • IE: position two text lines on top and bottom corners in table cell?

    - by diggonce
    I have a table with dynamic data. And there is a specific line of text which should be displayed only when a user hovers over the table row. This line of text should be 'fixed' to the table cell's bottom edge. It works so far with Firefox, but fails in IE. Live code can be seen here: http://2010resolutions.org/test/index.html The text in red should be fixed to the table cell's bottom border. (They will have a fixed height and width) Any clues how to get this working in IE? Any help is appreciated. Here's the code: <style> table { width: 500px; background: gray; } td { vertical-align: top; } .wrapper { position: relative; background: green; } tr, td, .wrapper { height: 100%; padding-bottom: 0.75em; } .bottom { position: absolute; left: 0; bottom: 0; background: red; } .bottom { visibility: hidden; } tr:hover .bottom { visibility: visible; } </style> <table> <tr class="data"> <td> <div class="wrapper"> This is line 1<br /> This is line 2<br /> This is line 3<br /> <span class="bottom">Bottom line 1</span> </div> </td> <td> <div class="wrapper"> This is line 4<br /> This is line 5<br /> This is line 6<br /> <span class="bottom">Bottom line 2</span></span> </div> </td> <td> <div class="wrapper"> This is line 7<br /> This is line 8<br /> This is line 9<br /> This is line 10<br /> This is line 11<br /> This is line 12<br /> <span class="bottom">Bottom line 3</span> </div> </td> </tr> <tr> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> </table>

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  • How do I create a hybrid two column lay out like php.net?

    - by Koning WWWWWWWWWWWWWWWWWWWWWWW
    I want to create a layout like this: | | | | | | | | | | | | | | | | -FIXED-|--------FLUID---------| | | | | | | | | | | | | | | Just like http://www.php.net/ I have this: div#sidebar { float: left; width: 200px; padding: 4px; background-color: #EEEEEE; border-right: dashed 1px #AAAAAA; } div#content { padding: 4px; margin-left: 208px; } But the problem is that the sidebar isn't at least the height of the content block (which it should be). Can anyone help me? Thanks Oh, one more thing: I will never, ever use a table for this!

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  • is it possible to make one click fires two events or more by javascript?

    - by NewInAlbert
    I am currently making a temporary download page for website visitor. The page includes a form, after the visitor fills the form up, the site will take them to the pdf download page. In the download page, there are some pdf files download links (I am just using a tag.). However, i wanna make a onclick event to those links, once they have been clicked, the page will refresh automatically or redirect to other pages. <a href="/file.pdf" onClick="window.location.reload()">The File</a> I have tried the jquery way as well. <a href="/file.pdf" id="FileDownload">The File</a> <script> $("#FileDownload").click(function(){ location.reload(); }); </script> But all the them are not working. Do you masters have any good ideas about this, many thanks. P.S. What if I wanna add a countdown after a file is being started download, and then do page reload when countdown finishes. Looks like have asked several questions... Thanks a ton in advance.

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  • How to Merge two databases in one in SQL Server 2008?

    - by SzamDev
    Hi I have 2 PCs, each one of them has SQL Server 2008 installed on it and there is a database with data in it. I need a way that I can move data in my DB from this SQL Server to another one (another PC which has the same DB) move data from one PC to another one - There is one problem, the ID column, because each DB in my 2 PCs has data in it so this column counts from 1,2,3,....... ( data will be conflict with other data in my DB ) Is there any way to solve my problem and move data successfully?

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  • Two forms are being called from one view.One encodes the russian text the doesn't.

    - by Daniel
    The menu I want to show to the users changes depending on their rights After user authentication I redirect to my menu action which calls its view access/menu.html.erb <% if admin? %> <%form_for(:user, :url => {:controller => 'admin_users',:name => session[:username]}) do |admin|%> <ul><h2>Administrator: <%=session[:username]%></h2></ul> <%= render(:partial =>'admin_form',:locals => {:admin => admin})%> <%end%> <%else%> <%form_for(:user, :url => {:controller => 'students',:name => session[:username]}) do |student|%> <ul><h2>???????: <%=session[:surname].to_s + " " + session[:name].to_s%></h2></ul> <%= render(:partial =>'student_form',:locals => {:student => student})%> <%end%> <%end%> And the forms look: _student_form: <table> <ul> <li><%=link_to '?????',{:controller => 'students'}%></li> </ul> <ul> <li><%=link_to '?????? ?????????',{:controller => 'students'}%></li> </ul> <ul> <li><%=link_to '???????? ?????? ????',{:controller => 'students'}%></li> </ul> <ul> <li><%=link_to '???????? ??????',{:controller => 'students'}%></li> </ul> <ul> <td>&nbsp;</td> </ul> </table> _admin_form: <table> <ul> <li><%=link_to '?????????? ????????????????',{:controller => 'AdminUsers',:role_id => 1}%></li> </ul> <ul> <li><%=link_to '?????????? ????????',{:controller => 'AdminUsers',:role_id => 2}%></li> </ul> <ul> <li><%=link_to '?????????? ??????????',{:controller => 'AdminUsers',:role_id => 3}%></li> </ul> <ul> <li><%=link_to '?????????? ???????????',:controller => 'subjects'%></li> </ul> <ul> <td>&nbsp;</td> </ul> </table> If a log in as a student I get: But if I log in as an administrator I get How can this be posible??

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  • How do I create two mutual producer/consumers with internal state in Haskell?

    - by Keith
    I've got an agent that takes in states and returns actions, while keeping an internal representation of the utility of state/action pairs. I've also got an environment that takes in actions and returns state/reward pairs. I need to be able to set the agent up with a start state and then continuously go from agent -(action)- environment -(state, reward)- agent -(action)-... However, the internal states (which need to be updated every iteration) need to stay private (that is, within the agent or the environment). This means that I can't simply call environment as a function within the agent using state and action as arguments. I'm somewhat of a Haskell noobie, so I'm not even sure if this is possible.

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  • Extracting two strings from quotations in Java using regex?

    - by user656710
    Hi everyone, I'm new to using patterns and looked everywhere on the internet for an explanation to this problem. Say I have a string: String info = "Data I need to extract is 'here' and 'also here'"; How would I extract the words: here also here without the single quotes using a pattern? This is what I have so far... Pattern p = Pattern.compile("(?<=\').*(?=\')"); But it returns ( here and 'also here ) minus the brackets, that is just for viewing. It skips over the second piece of data and goes straight to the last quote... Thank you!

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  • checking is username exists on two tables PHP PDO?

    - by PHPLOVER
    Me again. I have a users table and a users_banlist table. On my registration form i want to check all in one query whether the username someone entered on form exists in the users table and see if it also exists on the users_banlist table. I can do them on there own in individual queries but would rather do it all in one. Here is what i got, but even thou i enter a username that is taken it does not tell me its already taken. $stmt = $dbh->prepare(" SELECT users.user_login, users_banlist.user_banlist FROM users , users_banlist WHERE users.user_login = ? OR users_banlist.user_banlist = ?"); // checker if username exists in users table or users_banlist table $stmt->execute(array($username, $username)); if ( $stmt->rowCount() > 0 ) { $error[] = 'Username already taken'; } Basically i think it is something to do with the execute or rowCount(), could anyone tell me where i am going wrong ? being new to pdo im finding it a little confusing at the moment until i get my pdo book delivered to learn pdo. Thank you as always, phplover

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