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  • How to filter a list in J?

    - by Gregory Higley
    I'm currently learning the fascinating J programming language, but one thing I have not been able to figure out is how to filter a list. Suppose I have the arbitrary list 3 2 2 7 7 2 9 and I want to remove the 2s but leave everything else unchanged, i.e., my result would be 3 7 7 9. How on earth do I do this?

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  • iOS dynamic object creation

    - by Abdul Ahmad
    I've worked with Xcode and iOS on a few personal projects and have always used non-object-oriented designs for everything... just because I've been doing mostly learning/experimenting with things. Now I've been trying to implement some object oriented design into one game I've made previously. The idea is, I have a space ship that can shoot bullets. In the past I basically added the UIImageView to the storyboard and then connected it to the .h file and from there did things on it like move it around or whatever (using CGPointMake). The idea now is to make a method (and a whole other class soon) that will create a UIImageView programmatically, allocate it, add it to the superview etc... I've got this working so far, easy stuff, but the next part is a bit harder. Where do I store this local variable "bullet"? I've been saving it to an NSMutableArray and doing the following: (actually here are the methods that I have) -(void)movement { for (int i = 0; i < [array1 count]; i ++) { UIImageView *a = [array1 objectAtIndex:i]; a.center = CGPointMake(a.center.x + 2, a.center.y); if (a.center.x > 500) { [array1 removeObjectAtIndex:i]; [a removeFromSuperview]; } } } -(void)getBullet { UIImageView *bullet = [[UIImageView alloc] initWithFrame:CGRectMake(ship.center.x + 20, ship.center.y - 2, 15, 3)]; bullet.image = [UIImage imageNamed:@"bullet2.png"]; bullet.hidden = NO; [self.view addSubview:bullet]; [array1 addObject:bullet]; } (by the way, array1 is declared in the .h file) and theres a timer that controls the movement method timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(movement) userInfo:nil repeats:YES]; first question is: what is the correct way of doing this? Storing a bullet for example until it is removed from the superview, should I store it another way? and another question is, when I remove a UIImageView from the superview, does that remove it from memory so its not using up system resources? Thank you for the help! (will update if I Think of other questions

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  • Unexpected variable update when using bash's $(( )) operator for arithmetic

    - by philo
    I'm trying to trim a few lines from a file. I know exactly how many lines to remove (say, 2 from the top), but not how many total lines are in the file. So I tried this straightforward solution: $ wc -l $FILENAME 119559 my_filename.txt $ LINES=$(wc -l $FILENAME | awk '{print $1}') $ tail -n $(($LINES - 2)) $FILENAME > $OUTPUT_FILE The output is fine, but what happened to LINES?? $ wc -l $OUTPUT_FILE 119557 my_output_file.txt $ echo $LINES 107 Hoping someone can help me understand what's going on.

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  • Why is C++ backward compatible with C ? Why isn't there some "pure" C++ language ?

    - by gokoon
    C and C++ are different languages, blababla we know that. But if those language are different, why is it still possible to use function like malloc or free ? I'm sure there are all sort of dusty things C++ has because of C, but since C++ is another language, why not remove those things to make it a little less bloat and more clean and clear ? Is it because it allows programmers to work without the OO model or because some compilers doesn't support high-level abstract features of C++ ?

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  • Tips for making administration of Drupal site easier

    - by Busk
    I'm creating a Drupal site for a client, and I'd like to make administrating the site as easy as possible for them. Examples of what they'd want to do with the site is: Add/Edit/Remove content which will be displayed on various pages Manage a forum - Just the basic Drupal Forum module Add / Ban Users Respond to comments left using the webforum I see there is an Admin module, that looks pretty promising. But I was wondering if anyone has any other helpful tips. Thanks

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  • Modify iterator

    - by isola009
    I have a iterator (ite) created from a set (a): var a = Set(1,2,3,4,5) var ite = a.iterator If I remove 2 element of my set: a -= 2 Now, if I move iterator for all elements, I get all elements (2 element included). It's ok, but... How I can tell to iteratator to delete 2 element?

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  • jquery ui is not scaling text properly!

    - by Stephen Belanger
    I'm trying use jquery ui to scale a div that I'm dragging around to make it easier to see what's behind it, but any text inside it is scaling strangely. The text itself becomes smaller, but it seems to have a bunch of padding around it and is floating now. The text extends past the bottom of the div even though it should be contained properly by the div. I put a red border around the lines of text and the borders are the same size as the original text. I'm not really sure what to do to get this to work... HTML: <div class="item draggable" id="item-1'"> <div class="image-block"> <a class="delete-button" title="delete me!" href="/remove/1" onclick="return $(this).confirm(\'Really remove this image?\');">X</a> <a class="image" href="/edit/1"><img src="/someimage.jpg" /></a> <div class="clear-block"></div> </div> <h3>Some title</h3> </div> CSS: div.image-list div.item { float:left; background:#fff; width:150px; padding:5px; margin:4px; border:1px solid #d3d5d6; } div.image-list div.item h3 { margin:0; padding:0; border:solid 1px #F00; } div.image-list div.item div.image-block a.delete-button { float:right; position:relative; background:#fff; display:none; top:0.8em; margin-bottom:-20.0em; width:3em; height:1.8em; padding:0.2em 1em; } div.image-list div.item div.image-block a.image { float:left; display:block; } .clear-block { clear:both; } jquery: $(".draggable").draggable({ helper: 'clone', start: function(ev, ui) { $(ui.helper).effect( "scale", { percent: 50 }, 200 ); } });

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  • How to change a class's content using jQuery

    - by coffeeaddict
    Here is the div element on my page: How can I change a class's content? So from existing which is: class="jcarousel-next jcarousel-next-horizontal" to class="jcarousel-next jcarousel-next-horizontal jcarousel-next- disabled jcarousel-next-disabled-horizontal" Do I need to completely remove it by using removeClass and then re-add?

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  • Java java.util.ConcurrentModificationException error

    - by vijay
    Hi all, please can anybody help me solve this problem last so many days I could not able to solve this error. I tried using synchronized method and other ways but did not work so please help me Error java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(Unknown Source) at java.util.AbstractList$Itr.remove(Unknown Source) at JCA.startAnalysis(JCA.java:103) at PrgMain2.doPost(PrgMain2.java:235) Code public synchronized void startAnalysis() { //set Starting centroid positions - Start of Step 1 setInitialCentroids(); Iterator<DataPoint> n = mDataPoints.iterator(); //assign DataPoint to clusters loop1: while (true) { for (Cluster c : clusters) { c.addDataPoint(n.next()); if (!n.hasNext()) break loop1; } } //calculate E for all the clusters calcSWCSS(); //recalculate Cluster centroids - Start of Step 2 for (Cluster c : clusters) { c.getCentroid().calcCentroid(); } //recalculate E for all the clusters calcSWCSS(); // List copy = new ArrayList(originalList); //synchronized (c) { for (int i = 0; i < miter; i++) { //enter the loop for cluster 1 for (Cluster c : clusters) { for (Iterator<DataPoint> k = c.getDataPoints().iterator(); k.hasNext(); ) { // synchronized (k) { DataPoint dp = k.next(); System.out.println("Value of DP" +dp); //pick the first element of the first cluster //get the current Euclidean distance double tempEuDt = dp.getCurrentEuDt(); Cluster tempCluster = null; boolean matchFoundFlag = false; //call testEuclidean distance for all clusters for (Cluster d : clusters) { //if testEuclidean < currentEuclidean then if (tempEuDt > dp.testEuclideanDistance(d.getCentroid())) { tempEuDt = dp.testEuclideanDistance(d.getCentroid()); tempCluster = d; matchFoundFlag = true; } //if statement - Check whether the Last EuDt is > Present EuDt } //for variable 'd' - Looping between different Clusters for matching a Data Point. //add DataPoint to the cluster and calcSWCSS if (matchFoundFlag) { tempCluster.addDataPoint(dp); //k.notify(); // if(k.hasNext()) k.remove(); for (Cluster d : clusters) { d.getCentroid().calcCentroid(); } //for variable 'd' - Recalculating centroids for all Clusters calcSWCSS(); } //if statement - A Data Point is eligible for transfer between Clusters. // }// syn } //for variable 'k' - Looping through all Data Points of the current Cluster. }//for variable 'c' - Looping through all the Clusters. }//for variable 'i' - Number of iterations. // syn }

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  • Removing an Element on Certain Location

    - by Chicken Soup
    Let's say the window's location is on htt://stackoverflow.com/index.php, I want to remove an element in the index page with jQuery. This is what I have and it's not working: $(document).ready(function() { var location = window.location; var locQuery = /index/i; if (location.match(locQuery)) { $('.someClass').removeClass(); } });

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  • Qt: force resource reloading on every compilation.

    - by greg
    Is there a way to force QtCreator to recompile all the resources (images / qss files) i have specified in my qrc file every time i build the project? Currently if i change some styles in my qss file but dont remove the file and re-add it to the qrc file the old version of my qss file is used. Thanks.

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  • Local active directory access and management for development?

    - by Huck
    Hi everybody, In an application we are developpment, we are accessing Active Directory users and groups using the .Net DirectoryEntry and DirectorySearcher classes. Managing the test groups and users during development is getting tedious. I am wondering if there was an easy way to setup a simple local AD in which we could easily create / delete users and assign them or remove them from groups as we want with the DirectoryEntry / DirectorySearcher classes? Thanks.

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  • Which is more flexible in regards to database changes, EF 4 or Linq to SQL

    - by JBeckton
    Reading about both Linq to SQL and Entity Framework I have developed the impression that EF is more suitable for apps that get data from multiple data sources. But as I am reading about MVC2 models I see an example where EF is more loosely coupled with your data model. If I have to add or remove some columns from a table then what is involved in updating my model or DAL with each of these implementations?

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  • Set element style to the :hover style using jQuery

    - by Baddie
    Is it possible (using jQuery or otherwise) to set the style of a certain element to the :hover style defined in a stylesheet? .regStyle { background-color: #000; } .regStyle:hover { background-color: #fff; } Trying it out $("#differentButton").click(function(){ // this doesn't work $("#someElement").addClass("regStyle:hover").remove("regStyle"); });

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  • Bad class file error when using Scala 2.8.0-rc1 in Javafx 1.2

    - by aoprisan
    When trying to import scala.Option in a javafx script, I get the following javafxc error: bad class file: scala/Option$$anonfun$orNull$1.class(scala:Option$$anonfun$orNull$1.class) undeclared type variable: A1 Please remove or make sure it appears in the correct subdirectory of the classpath. import scala.Option; ^ I am using Scala 2.8.0-RC1, Javafxc 1.2.3_b36, JVM 1.6.0_18-b07, OS Ubuntu 9.10. The same code was working in Scala 2.7.7 .

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  • Removing HTML from a Java String

    - by Mason
    Is there a good way to remove HTML from a Java string? A simple regex like replaceAll("\\<.*?>","") will work, but things like &amp; wont be converted correctly and non-HTML between the two angle brackets will be removed (ie the .*? in the regex will disappear).

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  • How to find the only UILabel in a view and hide it?

    - by tarnfeld
    I am adding a UILabel as a subview to a UIView and sometime later I want to hide it. It is assigned to a variable but I don't think setting the variables property Hidden after it's been added to the view will work (well it doesn't seem to anyway). Is there a way to loop through the subviews in a view and then find the one that has a specific tag or is of type UILabel that I could then remove?

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  • Removing web.config from subversion (ASP.NET Project)

    - by adinas
    I have a project which is source controlled using Subversion and VisualSVN. Since the version of web.config is different on the server and the developers' computers I want the file to remain on the computers but to be ignored by Subversion. I added it to the svn:ignore but it still remains (and still has a red exclamation mark too since we are not committing it). How can I remove it from Subversion safely without it being deleted from the files system Thanks, Adin

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  • keep keyboard open when deleting/inserting UITableView's cell (iphone)

    - by Jonathan
    I have a login form using a UITableView. One of the cells has a UISwitch which when on will delete the row above it and when off reinsert it. But the first cell automatically has the keyboard up when the cell is created (basically when the view loads) (by using [cell becomeFirstResponder];) Inserting/deleting any of the cells means that the keyboard animates out and then animates back in. I'd like to remove this so the keyboard stays up while rows are deleted/inserted.

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  • A problem in my windows boot menu

    - by user210332
    Hi, One i had kept a supervisor password to my windows boot screen, but now i forgot that password, Now i am unable to access the boot menu since its asking the password, all menu options are disabled. Is it possible to remove that password and can i get the boot menu default settings back? Processor: Intel Pentium dual core (2) OS : XP Thanks in Advance,

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  • How can I get a string[] of all different values of a list?

    - by iTayb
    I have a class that has an list<Book> in it, and those Book objects has many many properties. string Subject is one of those properties. I'd like to get an string[] type value that will include all different subjects from all over the list. Is there an elegant way to do it, or I'll have to scan the whole list and enter each subject to it, then remove duplicates?

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  • Headers already sent

    - by Tom
    Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\atseit\irankiai.php:3) in C:\xampp\htdocs\atseit\irankiai.php on line 211 Is there any way to remove this warning and make cookies work? My 3rd line defines title and 211 line sets cookie.

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  • asp.net mvc select list

    - by mazhar
    ok what i want to do is to using forcollection["Selectlist"] only selected things in the select list will be availabe when the form posted i am using add ,remove mechanism in my listbox , so i want to make everything that is there in the checkbox as available to the forcollection["Selectlist"]. can it be done?

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