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  • Objective C memory management question with NSArray

    - by Robert
    I am loading an array with floats like this: NSArray *arr= [NSArray arrayWithObjects: [NSNumber numberWithFloat:1.9], [NSNumber numberWithFloat:1.7], [NSNumber numberWithFloat:1.6], [NSNumber numberWithFloat:1.9],nil]; Now I know this is the correct way of doing it, however I am confused by the retail counts. Each Object is created by the [NSNumber numberWithFloat:] method. This gives the object a retain count of 1 dosnt it? - otherwise the object would be reclaimed The arrayWithObjects: method sends a retain message to each object. This means each object has a retain cont of 2. When the array is de-allocated each object is released leaving them with a retain count of 1. What have I missed?

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  • Why use third-party vector libraries at all?

    - by Patrick Powns
    So I'm thinking of using the Eigen matrix library for a project I'm doing (2D space simulator). I just went ahead and profiled some code with Eigen::Vector2d, and with bare arrays. I noticed a 10x improvement in assigning values to elements in the array, and a 40x improvement in calculating the dot products. Here is my profiling if you want to check it out, basically it's ~4.065s against ~0.110s. Obviously bare arrays are much more efficient at dot products and assigning stuff. So why use the Eigen library (or any other library, Eigen just seemed the fastest)? Is it stability? Complicated maths that would be hard to code by yourself efficiently?

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  • MySQL select column length in php

    - by Patrick
    Hello! How do i get the actual max length of a specified column in php? For instance, this table: id - int(11) name - string(20) I want in php to select the maximum number of characters that a field can have, like SELECT length(name) from table1 and it should then return 20 (since its the maximum number of characters for that field).

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  • Domain entities into (ASP.NET) Session, or better some kind of DTOs?

    - by Robert
    Currently we put Domain Objects into our ASP.NET Sessions. Now we considering moving from InProc sessions to state server. This requires that all objects inside session are serializable. Instead to annotate all objects with the [Serializable] attribute, we thought about creating custom-session objects (DTO Session Objects?), which only contain the information we need: CONS: Entities must be reloaded, which requires additional DB round-trips PROS: Session State is smaller Session information is more specific (could be a CON) No unneeded annotation of Domain-Entities What do you think? Should we use some kind of DTOs to store inside the session, or should we stick with god old entities?

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  • returning a Void object

    - by Robert
    What is the correct way to return a Void type, when it isn't a primitive? Eg. I currently use null as below. interface B<E>{ E method(); } class A implements B<Void>{ public Void method(){ // do something return null; } }

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  • Value of variable changing before function is finished running

    - by Patrick
    I have an image uploading script in which i use the following setup to assign names to uploaded images; $saltdate = date( 'U' ); $saltuser = $_SERVER[REMOTE_ADDR]; $saltname = md5($saltdate.$saltuser); // Recieve, Process, Save uploaded image // Update database with image name The problem that i encounter is that after processing/saving the image, when its time to add this file name to the database, the value of $saltdate seems to have changed and i will get a file name in the database that doesnt exist. How can i make sure that the value doesn't change once i establish it?

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  • PHP: cannot matching string "<br />

    - by Patrick
    hi, I'm having problems with string matching in PHP. I've 2 html elements in my page, I've copy pasted here the content with Firebug <div class="field-item odd"> <div class="field-label-inline-first"> Year:</div> 2009 </div> <div class="field-item odd"> <div class="field-label-inline-first"> Synopsis:</div> &lt;br /&gt; </div> This php line works perfectly (the element with 2009 is detected) <?php if ($items[0]['view'] == '2009') : echo "ok"; ?> However I'm not able to match the string containing element: <?php if ($items[0]['view'] == '<br />') : echo "ok"; ?> //doesn't work <?php if ($items[0]['view'] == '&lt;br /&gt;') : echo "ok"; ?> //again doesn't work any tip ? To give you some context: The strings are produced by CKEditor, an editor I'm using in my Drupal back-end. When I leave empty this editor, the tag is displayed on the string as plain text (because I set "plain text" as formatting option in the back-end) Thanks

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  • CSS: how to move element from one column to another one without changing the html ?

    - by Patrick
    hi, I'm using css to edit the content of a page (NB. I cannot edit html code). I have 2 columns div1, div2. Each columns have several children (containing text). If the block has 2 or more lines of text all successive content is automatically moved down. I need to move a chidlren from the first column to the second one, in the middle. I was considering to use absolute positioning but then I realize how children are not anymore moving down as the number of text lines increases. How can I solve this ? <div id=div1> <div> blabla </div> <div> blabla </div> <div> blabla </div> </div> <div id=div2> <div> blabla </div> <div> blabla </div> <div> blabla </div> </div> thanks

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  • is the jQuery function "change()" working in IE ?

    - by Patrick
    is the jQuery function "change()" working in IE ? I usually use it to detect changes in forms (select/unselect check boxes), and submit them automatically without having to click on submit button (which is hided). i.e. $("#views-exposed-form-Portfolio-page-1").change(function(){ $("#views-exposed-form-Portfolio-page-1").submit(); }); But in Ie it doesn't work. It seems I have to use "click" instead. thanks

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  • checkbox checked with php form post?

    - by Patrick
    how do I check a checkbox? I've tried 1, On, Yes that doesn't work. putting the worked "checked" alone works but then how do I check with php after form post of the checkbox is checked? <input type="checkbox" class="inputcheckbox" id="newmsg" name=chk[newmsg2] value="1" />

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  • Java: empty ArrayLists in a foor loop

    - by Patrick
    hi, I'm reusing the same ArrayList in a for loop, and I use for loop results = new ArrayList<Integer>(); experts = new ArrayList<Integer>(); output = new ArrayList<String>(); .... to create new ones. I guess this is wrong, because I'm allocating new memory. Is this correct ? If yes, how can I empty them ? Added: another example I'm creating new variables each time I call this method. Is this good practice ? I mean to create new precision, relevantFound.. etc ? Or should I declare them in my class, outside the method to not allocate more and more memory ? public static void computeMAP(ArrayList results, ArrayList experts) { //compute MAP double precision = 0; int relevantFound = 0; double sumprecision = 0; thanks

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  • Mac OS X: getting file system changes of the last minute?

    - by Patrick
    From older times (Mac OS 10.4) I had found this command line on the web somewhere: mdfind '(kMDItemFSContentChangeDate >= $time.now(-60)) && (kMDItemFSContentChangeDate <= $time.now)' it gave me a list of files that where changed in the last minute. This does not work anymore on Mac OS 10.6. Can anybody explain why this doesn't work? And even suggest a working command line?

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  • How to put buttons in a html page in a jQuery dialog

    - by Robert
    eHello everyone,the following is my code to display a jquery dialog window with a closing button "OK": <script type="text/javascript"> $(function(){$("#dialog").dialog({autoOpen:false,bgiframe:true,buttons: { "OK": function() { $(this).dialog("close"); } }, width:500, height: 350, modal: true, show: 'slide', hide:'slide', title:"Similar Trends Detected in 2nd DataSet"}); $("#userid").focus(); }); function showForm(matches){ $("#dialog").html(matches).dialog("open");} Currently it runs by supplying a string variable "matches",then the content of the variable gets displayed on the dialog frame. Now me and my teammate want to extend this dialog a little,we want to attach a button to every line inside the html content("matches" variable),please note that we don't want buttons in the dialog(like another "OK" button),but we want buttons "inside" the frame (the actual html content). So I would like some help here,how could I modify my "matches" variable,to have buttons also shown inside the dialog. Thanks.

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  • Drupal, Themekey module doesn't work for a user

    - by Patrick
    hi, Themekey module, (that I use to switch the theme on specific pages of my backend), works for my first Drupal user but it doesn't work for the second Drupal user. In other words, the second user see a page in its default theme. I was wondering if I have to create again the account for this user, and why ThemeKey module doesn't apply consistently to all users. The page I'm customizing a view from which you can edit the content of the website. i've checked for permissions, but I couldn't find any difference between the 2 users. Thanks

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  • FLEX: can I use a Repeater inside a Series element ?

    - by Patrick
    hi, can I use mx:Repeater inside mx:Series element ? <mx:series> <mx:AreaSeries id="timeArea" styleName="timeArea" name="A" dataProvider="{dataManager.tagViewTimelineModel.tags.getItemAt(0).yearPopularity}" yField="popularity" areaStroke="{new Stroke(0x0033CC, 2)}" areaFill="{new SolidColor(0x0033CC, 0.5)}" /> <mx:LineSeries styleName="timeLine" dataProvider="{dataManager.tagViewTimelineModel.tags.getItemAt(0).yearPopularity}" yField="popularity" stroke="{new Stroke(0xCC33CC, 2)}" /> </mx:series> I don't compiling errors, but my application just doesn't start. thanks

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  • Drupal 6: best way to upgrade jQuery ?

    - by Patrick
    Hi! I want to upgrade jQuery inside my drupal installation. At the moment I have jQuery 1.2.6 and I would like to upgrade it to jQuery 1.4 I guess some Drupal modules still depends on the old jQuery version. I've tried jquery_update module to upgrade jQuery, but it didn't work. It asked to replace the original Drupal files in the "misc" folder with the new ones, but it didn't work. Anyway, I was wondering if there is a better method instead of using another module thanks

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