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• A balanced binary search tree which is also a heap

  - by saeedn

  I'm looking for a data structure where each element in it has two keys. With one of them the structure is a BST and looking at the other one, data structure is a heap. With a little search, I found a structure called Treap. It uses the heap property with a random distribution on heap keys to make the BST balanced! What I want is a Balanced BST, which can be also a heap. The BST in Treap could be unbalanced if I insert elements with heap Key in the order of my choice. Is there such a data structure?

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• Why is the Twitter Bootstrap "fixed" layout NOT fixed?

  - by leonel

  The Twitter Bootstrap site reads as follows: The default and simple 940px-wide, centered layout for just about any website or page provided by a single <div class="container">. Quote from http://twitter.github.com/bootstrap/scaffolding.html#layouts That's exactly what I have in my HTML but when I inspect the element, I see this CSS apply to it: .container, .navbar-fixed-top .container, .navbar-fixed-bottom .container { width: 1170px; } By the way, if I override that CSS rule by adding... div.container{ width:940px; } Then the elements inside the div.container are wider than the div.container itself and look out of place. So, why is the Twitter Bootstrap "fixed" layout NOT fixed? and how can I make it fixed?

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• How to open files in Java Swing without JFileChooser

  - by ron

  I'm using Java Swing (GUI) and I want to add a button to my project for opening files . I don't like the JFileChooser since it opens a small window for browsing through the files of the directories . Can I use something else , instead of the JFileChooser under Java Swing ? I've tried to use elements of SWT but it didn't work , meaning is the use of the button object and then use it inside the Jframe , but that failed , so I guess SWT and Swing don't mix together? Here is the example of Java Swing with JFileChooser and I'm looking for something like this to put in my JFrame.

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• Is there an expand.grid like function in R, returning permutations ?

  - by Brani

  To become more specific, here is an example: > expand.grid(5, 5, c(1:4,6),c(1:4,6)) Var1 Var2 Var3 Var4 1 5 5 1 1 2 5 5 2 1 3 5 5 3 1 4 5 5 4 1 5 5 5 6 1 6 5 5 1 2 7 5 5 2 2 8 5 5 3 2 9 5 5 4 2 10 5 5 6 2 11 5 5 1 3 12 5 5 2 3 13 5 5 3 3 14 5 5 4 3 15 5 5 6 3 16 5 5 1 4 17 5 5 2 4 18 5 5 3 4 19 5 5 4 4 20 5 5 6 4 21 5 5 1 6 22 5 5 2 6 23 5 5 3 6 24 5 5 4 6 25 5 5 6 6 This data frame was created from all combinations of the supplied vectors. I would like to create a similar data frame from all permutations of the supplied vectors. Notice that each row must contain exactly 2 fives, yet not necessarily as the fist two elements. Thank you.

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• Iterate set covered by cross-product of ranges in ruby

  - by wilsona

  I figured this answer had been asked before, so I searched, but I couldn't find anything. Granted, there are a ton of Ruby Array questions, so it might be there, just buried. In any case, I'm trying to reduce a cross-product of ranges, returning a sum of all elements of the cross-product that meet some set of conditions. To construct a trivial example, if I have an array like this: [0..1,0..1,0..1] I'd like to iterate over this set: [ [0,0,0], [0,0,1], [0,1,0], [0,1,1], [1,0,0], [1,0,1], [1,1,0], [1,1,1] ] and return a sum based the condition "return 1 if i[0] == 1 and i[2] == 0" (which would give 2). In my contrived example, I could do it like this: br = 0..1 br.reduce(0){|sumx, x| sumx + br.reduce(0){|sumy, y| sumy + br.reduce(0){|sumz, z| sumz + (x == 1 and z == 0 ? 1 : 0) } } } , but in the actual application, the set of ranges might be much larger, and nesting reduces that way would get quite ugly. Is there a better way?

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• Problems with overlapping ChildWindows in Silverlight

  - by Humanier

  Hello, I have a Silverlight application. At some point the app shows a ChildWindow with two datagrids and three buttons on it. One of the buttons is 'Reset To Defaults'. After it's pressed, the app shows another ChildWindow on top of the current one in order to ask confirmation. After the second ChildWindow is closed the first one starts to act funny. It's still changing highlighting of the elements on mouse events (mouseover on a grid element, click on a button). But clicking on the buttons doesn't fire my custom event handlers anymore. The only thing which is working on the ChildWindow is a small cross button created by the framework itself in the upper-right corner of the ChildWindow. I'd be grateful for any ideas on the cause of the problem or how to resolve it. Thanks.

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• TFS: Managing assembly version number?

  - by TomTom

  Hello, any good approach for managing assembly version numbers in TFS, possibly together with using the same number for the build number? I would be most interested in an approach that: Maintains the first three elements of the version Counts the rest upward for every "official" build (i.e. a build originating from certain templates only - no need to count up for something like a gated checkin, but the following regular integration build SHOULD count up. Labels the builds, so that a manual "release" build can be triggered. Any solution? How are other people handling this? Right now the (new) TFS is happily building with the same assembly version all around ;) Something coding the complete assembly version with date etc. is not acceptable - I want that number to "follow rules", and having the date in there is not one of them ;)

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• Enable/disable zoom on iPhone safari with Javascript?

  - by msqr

  I have 1 page which has 2 DIV elements which is shown/hidden based on user click on action buttons with javascript, I would like to toggle scaling on action button click. I tried with below javascript and it is changing viewport meta but getting no effect. Any suggestions? Blockquote var ViewPortAllowZoom = 'width=device-width;'; var ViewPortNoZoom = 'width=device-width; initial-scale=1.0; maximum-scale=1.0; minimum-scale=1.0; user-scalable=no;'; function AllowZoom(flag) { if (flag == true) { $('meta[name*=viewport]').attr('content', ViewPortAllowZoom); } else { $('meta[name*=viewport]').attr('content', ViewPortNoZoom); } }

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• Finding the right version of the right JAR in a maven repository

  - by Matt McHenry

  I'm converting a build that has 71 .jar files in its global lib/ directory to use Maven. Of course, these have been pulled from the web by lots of developers over the past ten years of this project's history, and weren't always added to VCS with all the necessary version info, etc. Is there an easy, automated way to go from that set of .jar files to the corresponding <dependency/> elements for use in my pom.xml files? I'm hoping for a web page where I can submit the checksum of a jar file and get back an XML snippet. The google hits for 'maven repository search' are basically just finding name-based searches. And http://repo1.maven.org/ has no search whatsoever, as far as I can see. Update: GrepCode looks like it can find projects given an MD5 checksum. But it doesn't provide the particular details (groupId, artifactId) that Maven needs.

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• iPhone UITableView populating variable rows sections from flat array

  - by Biko

  I thought that would be very common and easy iPhone App. In the main app I connect to database, retrieve values from database (NSDate converted to NSString)n and put into single array. The in one of the views I populate UITableView with elements from the array. UITableView is grouped (sections). I step through array to discover number of sections (change section if new day). How do I retrieve correct element of array in cellForRowAtIndexPath? IndexPath.section and IndexPath.row seem useless as row starts count from zero for each section. If number of rows in each section was the same it would have been easy: [arryData objectAtIndex:(indexPath.row)+indexPath.section*[tblMatchesView numberOfRowsInSection:indexPath.section]]; But number of rows in each section varies... :-)

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• Rendering "partial" pages in ASP.Net? (without the <html> and such)

  - by Earlz

  Hello, I am trying to make use of jQueryUI AJAX tabs in my ASP.Net Webforms project. I have come up against a wall though. For AJAX, you must render only a partial page(no <html> and such elements) by an external URL. How would you best do this in ASP.Net? aspx files require things like a <html> and <head> tag so those wouldn't work so the only thing that comes to mind is using cumbersome ashx files. Am I just over thinking this? Is there an easier way?

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• searching map by value

  - by Mariusz Chw

  I have 2 elements (for now) map: #define IDI_OBJECT_5001 5001 #define IDI_OBJECT_5002 5002 /.../ ResourcesMap[IDI_OBJECT_5001] = "path_to_png_file1"; ResourcesMap[IDI_OBJECT_5002] = "path_to_png_file2"; I'm trying to implement method for searching this map. I'm passing string argument (file path) and method return int (key value of map) int ResFiles::findResForBrew(string filePath) { string value = filePath; int key = -1; for (it = ResourcesMap.begin(); it != ResourcesMap.end(); ++it) { if (/*checking if it->second == value */) { key = it->first; break; } } return key; } How I could check when it-second- == value, and then return that key? I would be grateful for some help. Thanks in advance.

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• main content wrapper div get's pushed down the page in IE

  - by Blankman

  I have a 2 column layout, with the left side for navigation and the right side for the main content. The right side content has a wrapper div that looks like: Now this looks fine in FF and GC, and it IE but if I change the padding to anything over 4px that section gets pushed down below the left navigation. #content { padding:3px; // 4 makes it get pushed down } Does this mean IE has a different way of calculating the width of all my elements? Is this a common problem that has a solution for it?

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• How to use CSS to ensure items remain offscreen even if window is resized?

  - by Ashley Ward

  I am trying to implement a type of slider using jquery. However this question is about the CSS involved in trying to achieve the functionality. My site design occupies a central column of width 960px. Within this layout there is a central element, that I wish to slide right, on click of a "next" button, and at the same time, another element of the same class slides in from the left to occupy the space vacated. I have drawn a diagram of what I am trying to achieve. In this diagram the red blocks are the element I want to slide in and out, it is grouped by a div which moves left to produce the effect using jQuery I have 2 main questions: How do I get the correct margin values, given that the browser window width can vary and that all elements that are not the current item should be offscreen? 2.If the user were to resize the margins could be dynamically altered based on the values returned using the jQuery resize() event. Or is there a neater quicker better way of doing it using pure CSS?

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• scanf formatting issue

  - by da_rockwilder

  I have a log file with the following format: INFO 2011-03-09 10:26:15,270 [user] message I want to parse the log file using PHP: // assume file exists and all that $handle = fopen("log_file.txt", "r"); while ($line_data = fscanf($handle, "%s %s %s [%s] %s\n")) { var_dump($line_data); } fclose($handle); When I run this code I get: [0]=> array(5) { [0]=> string(4) "INFO" [1]=> string(10) "2011-03-09" [2]=> string(12) "10:26:15,270" [3]=> string(5) "user]" [4]=> NULL } // snip It appears the closing bracket in the format string ("%s %s %s [%s] %s") is disrupting the rest of the line from getting parsed. I checked the PHP docs for scanf (as suggested by fscanf), and I didn't see anything mentioning having to escape a left bracket. Any suggestions on how to get the 4th and 5th elements to look like "user" and "message" respectively?

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• looking for help with Flash sound to play on an iPad

  - by phm

  I hope you might be willing to help me. Years ago, when I was designing a game site, it was recommended to me to do what you pretty much suggested in your answer to a question about Flash sound: put my sound effects as Flash elements. This works great on every platform except the iPad. Do you have any idea what I should do? I'd really appreciate your help and you sound like a helpful person. Some people here can be kind of mean. I'm not a programmer by training, just self taught.

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• O'Reilly book clarification on 2d linear system

  - by Eric

  The Oreilly book "Learning openCV" states at page 356 : Quote Before we get totally lost, let’s consider a particular realistic situation of taking measurements on a car driving in a parking lot. We might imagine that the state of the car could be summarized by two position variables, x and y, and two velocities, vx and vy. These four variables would be the elements of the state vector xk. Th is suggests that the correct form for F is: x = [ x; y; vx; vy; ]k F = [ 1, 0, dt, 0; 0, 1, 0, dt; 0, 0, 1, 0; 0, 0, 0, 1; ] It seems natural to put 'dt' just there in the F matrix but I just don't get why. What if I have a n states system, how would I spray some "dt" in the F matrix?

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• Domain migration - 301 Redirect of all contentes of directory)

  - by Trufa

  Hi, I would like to know if it is possible to do the following considering that I would like to migrate domains. I have lets say: one.com/files/one.html one.com/files/two.php one.com/other/three.html one.com/other/four.doc one.com/other/subdirectory/five.doc I am migrating to two.com So I would like to make RESPECTIVE 301 redirects to the following: two.com/old/files/one.html two.com/old/files/two.php two.com/old/other/three.html two.com/old/other/four.doc two.com/old/other/subdirectory/five.doc I've tried with cPanel and although I come "close" with the redirects option I can't seem to make it happen. The folders are not much (10 -12) the file are a lot, and obviously impossible to make it manually. How would you proceed? Can this/ should this be done with regex from the .htaccess?? Can you direct all the elements of a subdirectory in the manner expressed above? I hope the question is clear enough, if not please ask for any clarification needed!! Thanks in advance!!

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• Front-end phtml template form doesn't connect to controller.php file

  - by user888786

  The web system which I'm working on right now, has a add.phtml (in views folder) form, which contain normal form elements and pageController.php (in Controller folder) file which has function to be connected when user hit "add page" button on the form. The codes goes like this. on add.phtml file, input type = "submit" value ="Add Page" on pageController.php file, function insertAction(){ } For some reason these two doesn't connect now. Is anybody have any idea why this doesn't work or what should I check on this kind of a problem. The web system on zend framewok. I really appreciate if someone can help me.

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• GUI design techniques to enhance user experience

  - by aku

  What techniques do you know\use to create user-friendly GUI ? I can name following techniques that I find especially useful: Non-blocking notifications (floating dialogs like in Firefox3 or Vista's pop-up messages in tray area) Absence of "Save" button MS OneNote as an example. IM clients can save conversation history automatically Integrated search Search not only through help files but rather make UI elements searchable. Vista made a good step toward such GUI. Scout addin Microsoft Office was a really great idea. Context oriented UI (Ribbon bar in MS Office 2007) Do you implement something like listed techniques in your software? Edit: As Ryan P mentioned, one of the best way to create usable app is to put yourself in user's place. I totally agree with it, but what I want to see in this topic is specific techniques (like those I mentioned above) rather than general recommendations.

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• How to programatically create a xaml panel with controls

  - by randy

  Hello, Is it possible to programatically create a new panel within a current document that contains duplicate elements? For example when the window loads I have a grid (one row) with three text fields, Fname01, Lname01, and DOB01, I would like to have a button that when clicked would append a new row to the grid with three new fields (Fname02, Lname02, and DOB02). Each time the button is clicked (addrow) a new row would be created. I am also interested to learn how these fields are identified within the xaml that would allow me to databind or programatically reference the created fields for insertion of the values into a database etc. Thank you in advance,

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• How does one reduce a list of boolean values in Common Lisp?

  - by postfuturist

  Given a list of values, I want to reduce the list to T if all the elements are not NIL, NIL if not. This gives me an error: (apply #'and (get-some-list)) As does this: (reduce #'and (get-some-list)) This is the best I've come up with: [11]> (defun my-and (x y) (and x y)) MY-AND [12]> (reduce #'my-and '(T T T T T)) T [13]> (reduce #'my-and '(T T T T NIL)) NIL Why is "#'and" invalid? Is there a more idiomatic way to do this in Common Lisp?

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• In DOM is it OK to use .notation for getting/setting attributes?

  - by Ziggy

  Hi In DOM, is it OK to refer to an element's attributes like this: var universe = document.getElementById('universe'); universe.origin = 'big_bang'; universe.creator = null; universe.style.deterministic = true; ? My deep respect for objects and their privacy, and my sense that things might go terribly wrong if I am not careful, makes me want to do everything more like this: var universe = document.getElementById('universe'); if(universe.hasAttribute('origin')) then universe.origin = 'big_bang'; etc... Is it really necessary to use those accessor methods? Of course it may be more or less necessary depending on how certain I am that the elements I am manipulating will have the attributes I expect them to, but in general do the DOM guys consider it OK to use .notation rather than getters and setters? Thanks!

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• RUP (Rational Unified Process)

  - by tony

  I have chosen to use the development method RUP (Rational Unified Process) in my project. This is a method I've never used before. I've also included some elements from Scrum in the development process. The question is what the requirement specifications should contain in a RUP-model? Is it functional and non-functional requirements? And what should be included in a technical analysis and security requirements for RUP? Can’t find any information. Notes about this would be helpful. Hope people with RUP experience can share some useful experiences

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• C# Linq: Restructuring object

  - by Ben

  I'd like to take an object like this: SortedList<string, SortedList<int, SortedList<DateTime, double>>> Data and, for a given 'int' value (key of first nested sorted list), restructure it like this: SortedList<DateTime, SortedList<string, double>> or, better yet, this: SortedList<DateTime, double[]> where each 'double[]' has as many elements as there are KeyValue pairs in the SortedList. I'm guessing Linq is the way to go, but can't figure it out. Thanks for any suggestions.

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