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  • Floating point arithmetics restricted to integers

    - by user396672
    I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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  • jQuery .load(), don't show new content until images loaded

    - by Jarred
    Hi. I have been working on a jQuery photo slideshow. It scales the images to the browser size, and slides them left and right. There is no pre-determined size or aspect ratio, the script does everything on the fly. It requires that all images be fully loaded, so it can custom resize each individual image based on it's own aspect ratio ( width():height(), etc ), calculate the width of containing div, and calculate the slide distance from one image to another. As a stand-alone, it works pretty well (despite my lack of skills)! I simply hide the slideshow containing div at (document).ready, allow the images to load, then run the slideshow prep scripts at (window).load. Once this is done, it only then makes the slideshow divs, images, etc appear, properly sized, positioned and ready to roll. The ultimate goal is to be able to load in any number of slideshows without refreshing the page. The point of this is to be able to play uninterrupted background music. I know music on websites is annoying, but the target market likes it, a lot! I am using (target).load(page.php .element, function prepInsertNewShow() { //Prepare slideshow resizeImages(); slideArray(); //Show slideshow (target).fadeIn(); }); and it definitely works! The problem is that I cannot find a way to hold off on preparing and showing the new content until the images have finished loading. It is running the slideshow prep scripts (which are totally dependent on the images being fully loaded), before the images are loaded. This results in a completely jacked up show! What I want to do is this - (target).load(page.php .element, function prepInsertNewShow() { //Wait until images are loaded $('img').load( function() { //Prepare slideshow resizeImages(); slideArray(); //Show slideshow (target).fadeIn(); } }); But this doesn't seem to work, the new content is never shown. You can see a live version here. The initial gallery loads correctly, everything looks good. The only nav link that works is Galleries Engagement, which will load a new show (a containing div with multiple <img> tags). You will see that the images are not centered, the containing div and slide distances are much too small, as they were calculated using images that were not actually loaded. Is there any way I can delay handling and showing new content until it is fully loaded? Any suggestions would be most appreciated, thanks for your time! PS - It just occurred to me while typing this that a decent solution may be to insert "width=x" height="x" into the <img> tags, so the script can work from those values, even if the images have not loaded...hmm...

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  • How does CSS 3 border-image work exactly?

    - by Tower
    Hi, I have an image of 4x4 in size and I want to use it all around a DIV's border. The following: -moz-border-image: url("../images/window/side.png") 4 4 4 4 / 4px 4px 4px 4px repeat repeat will place left and right borders, but not bottom and top. What's wrong with it? I think I have misunderstood the syntax and if that is so, how does this syntax really work?

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  • Calculating all distances between one point and a group of points efficiently in R

    - by dbarbosa
    Hi, First of all, I am new to R (I started yesterday). I have two groups of points, data and centers, the first one of size n and the second of size K (for instance, n = 3823 and K = 10), and for each i in the first set, I need to find j in the second with the minimum distance. My idea is simple: for each i, let dist[j] be the distance between i and j, I only need to use which.min(dist) to find what I am looking for. Each point is an array of 64 doubles, so > dim(data) [1] 3823 64 > dim(centers) [1] 10 64 I have tried with for (i in 1:n) { for (j in 1:K) { d[j] <- sqrt(sum((centers[j,] - data[i,])^2)) } S[i] <- which.min(d) } which is extremely slow (with n = 200, it takes more than 40s!!). The fastest solution that I wrote is distance <- function(point, group) { return(dist(t(array(c(point, t(group)), dim=c(ncol(group), 1+nrow(group)))))[1:nrow(group)]) } for (i in 1:n) { d <- distance(data[i,], centers) which.min(d) } Even if it does a lot of computation that I don't use (because dist(m) computes the distance between all rows of m), it is way more faster than the other one (can anyone explain why?), but it is not fast enough for what I need, because it will not be used only once. And also, the distance code is very ugly. I tried to replace it with distance <- function(point, group) { return (dist(rbind(point,group))[1:nrow(group)]) } but this seems to be twice slower. I also tried to use dist for each pair, but it is also slower. I don't know what to do now. It seems like I am doing something very wrong. Any idea on how to do this more efficiently? ps: I need this to implement k-means by hand (and I need to do it, it is part of an assignment). I believe I will only need Euclidian distance, but I am not yet sure, so I will prefer to have some code where the distance computation can be replaced easily. stats::kmeans do all computation in less than one second.

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  • How to make all controls of a column the same width

    - by ant18
    Hi I need to know if there's any way of making all controls of a column the same width, and that all these controls are as wide as the cells that contain them. I added a demo on JSFiddle with the controls I'm using. I tried using size for the input texts and style="width:" for the selects , and even though I managed to make them the same width,(it doesn't seem to work in Chrome) it's kinda difficult , that's why I'd like to know if there is any more straightforward way to do the same thing Any ideas or insights?

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  • Scaling vectors from a center point?

    - by user146780
    I'm trying to figure out if I have points that make for example a square: * * * * and let's say I know the center of this square. I want a formula that will make it for eample twice its size but from the center * * * * * * * * Therefore the new shape is twice as large and from the center of the polygon. It has to work for any shape not just squares. I'm looking more for the theory behind it more than the implementation. Thanks

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  • How to share a dictionary between multiple processes in python without locking

    - by RandomVector
    I need to share a huge dictionary (around 1 gb in size) between multiple processs, however since all processes will always read from it. I dont need locking. Is there any way to share a dictionary without locking? The multiprocessing module in python provides an Array class which allows sharing without locking by setting lock=false however There is no such option for Dictionary provided by manager in multiprocessing module.

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  • UPLOAD DATA IN DATA BASE

    - by rajson
    HI friends, i wish to store image and resume of user in the data base. i am using mysql data base and php5. i want to know that which field i set means data type.and how i set the range (maximum size) for uploaded data.

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  • stick button to bottom of element

    - by dzona
    Is there any way to stick child button element to bottom of parent element when number of child elements vary? Parent element is fixed height, and could be scrolled vertically in case of child overflow. In that case, button should be at the end of child list, but in case there is no children, or children size don't push parent element to overflow, it should be at bottom of parent element. Is there pure css solution for this? Thanks

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  • Getting jQuery to recognise .change() in IE

    - by Philip Morton
    I'm using jQuery to hide and show elements when a radio button group is altered/clicked. It works fine in browsers like Firefox, but in IE 6 and 7, the action only occurs when the user then clicks somewhere else on the page. To elaborate, when you load the page, everything looks fine. In Firefox, if you click a radio button, one table row is hidden and the other one is shown immediately. However, in IE 6 and 7, you click the radio button and nothing will happen until you click somewhere on the page. Only then does IE redraw the page, hiding and showing the relevant elements. Here's the jQuery I'm using: $(document).ready(function(){ $(".hiddenOnLoad").hide(); $("#viewByOrg").change(function () { $(".visibleOnLoad").show(); $(".hiddenOnLoad").hide(); }); $("#viewByProduct").change(function () { $(".visibleOnLoad").hide(); $(".hiddenOnLoad").show(); }); }); Here's the part of the XHTML that it affects. Apologies if it's not very clean, but the whole page does validate as XHTML 1.0 Strict: <tr> <td>View by:</td> <td> <p> <input type="radio" name="viewBy" id="viewByOrg" value="organisation" checked="checked"/> Organisation </p> <p> <input type="radio" name="viewBy" id="viewByProduct" value="product"/> Product </p> </td> </tr> <tr class="visibleOnLoad"> <td>Organisation:</td> <td> <select name="organisation" id="organisation" multiple="multiple" size="10"> <option value="1">Option 1</option> <option value="2">Option 2</option> </select> </td> </tr> <tr class="hiddenOnLoad"> <td>Product:</td> <td> <select name="product" id="product" multiple="multiple" size="10"> <option value="1">Option 1</option> <option value="2">Option 2</option> </select> </td> </tr> If anyone has any ideas why this is happening and how to fix it, they would be very much appreciated!

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  • fieldWithErrors not wrapping every error field

    - by Teef L
    Notice the following result when I submit blank :title and :description fields The validations are in the controller: class Question < ActiveRecord::Base validates_presence_of :title validates_presence_of :description And, the form is generated with those names: -form_for(@question) do |f| = f.error_messages = f.label :title = f.text_field :title, :size => 50, :onchange => remote_function(:url => {:action => :display_tag_suggestions}, :with => 'Form.Element.serialize(this)') #suggestions = f.label :description = f.text_area :description ... But, for some reason, only :title gets wrapped in the error div tags: <form action="/questions" class="new_question" id="new_question" method="post"> <div style="margin:0;padding:0"><input name="authenticity_token" type="hidden" value="6HQaiu1D0gBQcKw2pLeZP6Jvn0FSClPD5Sk9HwegzPg=" /></div> <div class="errorExplanation" id="errorExplanation"> <h2>2 errors prohibited this question from being saved</h2> <p>There were problems with the following fields:</p> <ul> <li>Title can't be blank</li> <li>Description can't be blank</li> </ul> </div> <label for="question_title">Title</label> <div class="fieldWithErrors"><input id="question_title" name="question[title]" onchange="new Ajax.Request('/questions/display_tag_suggestions', {asynchronous:true, evalScripts:true, parameters:Form.Element.serialize(this) + '&amp;authenticity_token=' + encodeURIComponent('6HQaiu1D0gBQcKw2pLeZP6Jvn0FSClPD5Sk9HwegzPg=')})" size="50" type="text" value="" /></div> <label for="question_description">Description</label> <textarea cols="40" id="question_description" name="question[description]" rows="20"></textarea> ... I don't think that behavior is expected. The problem most people have is that it's wrapping things with divs, which won't display properly. My problem is that fields aren't being wrapped with divs to begin with! I haven't made any (conscious) changes to how errors are handled, so I'm not sure why it's not working properly.

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  • Does the List in .NET work the same way as arraylist in Java?

    - by eflles
    When I learned Java, I was told that the arraylist works this way: It creates an array with room for 10 elements. When the 11th element is added, it is created a new list with room for 20 elements, and the 10 elements are copied into the new array. This will repeat as until there are no more elements to add, or to a maximum size. Is the List in .NET constructed the same way?

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  • Function to get the font and calculate the width of the string not working on first instance

    - by user3627265
    I'm trying to calculate the width of the string based on the font style and size. The user will provide the string, the font style and the font size, and then after giving all the data the user will hit the submit button and the function will trigger. Basically this script works but only when the submit button is hit twice or the font is selected twice,. I mean if you selec DNBlock as a font, it will not work for first time, but the second time you hit submit, it will then work. I'm not sure where is the problem here, but when I used the default font style like Arial, times new roman etc it works perfectly fine. Any Idea on this? I suspected that the font style is not being rendered by the script or something. Correct me if I'm wrong. Thanks //Repeat String String.prototype.repeat = function( num ) { return new Array( num + 1 ).join( this ); } //Calculate the width of string String.prototype.textWidth = function() { var fntStyle = document.getElementById("fntStyle").value; if(fntStyle == "1") { var fs = "DNBlock"; } else if(fntStyle == "2") { var fs = "DNBlockDotted"; } else if(fntStyle == "3") { var fs = "DNCursiveClassic"; } else if(fntStyle == "4") { var fs = "DNCursiveDotted"; } else if(fntStyle == "5") { var fs = "FoundationCursiveDots-Regul"; } var f = document.getElementById("fntSize").value.concat('px ', fs), o = $('<div>' + this + '</div>') .css({'position': 'absolute', 'float': 'left', 'white-space': 'nowrap', 'visibility': 'hidden', 'font': f}) .appendTo($('body')), w = o.width(); o.remove(); return w; } //Trigger the event $("#handwriting_gen").submit(function () { var rptNO = parseInt($('#rptNO').val()); $("[name='txtLine[]']").each(function(){ alert(this.value.repeat(rptNO).textWidth()); if(this.value.repeat(rptNO).textWidth() > 1000) { $(this).focus(); $(this).css({"background-color":"#f6d9d4"}).siblings('span.errorMsg').text('Text is too long.'); event.preventDefault(); } }); });

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  • compressing XML file

    - by Sathish
    HI I have an xml file with 500KB size which i need to send it to webservice, so i want to compress this data and send it to the webservice i have heard of some base24Encoding something... Can anyone throw more light on this Suppose if i use GZipStream how can i send the file to the webservice Thanks in Advance

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  • how to increase the content of the data in itemrenderer of the list?

    - by maniohile
    hi, i'm binding data into list which comes from the backend ,i want to increase the height of each content,i have used height ='some value',it's get increased ,i want to increase the size of the content with the value of 32 but it didn't get increased but i gave the itemrenderer (hbox)height as 100%..is it any inbuilt bug on flex or bug on me..thank's in advance...

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  • Android - Add other values to websettings settextsize

    - by user1681477
    In my application I am using a webview, and in order to increase/decrease text size, I am using WebSettings().setTextSize method, but, this method is limited to 5 predefined enum sizes only (SMALLEST, SMALLER, NORMAL, LARGER,LARGEST). I know I can use WebSettings().setTextZoom(int), but my application is available for API Level 8 and above, and this method was introduced in API Level 14... My question is: Is there any way to add other sizes to webSettings().setTextSize? maybe by extending textSize enum, or define other sizes?

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  • In an iPhone app, is it beneficial to tile a background image that has a pattern in it?

    - by Dr Dork
    Here's an example of the type of background image I'm talking about, the iPhone Notes app... Clearly, there's a pattern in it. My question is, if this were an iPad app and the background image was twice the size, would there be any significant benefits to taking advantage of this pattern by tiling the image? Or would it really make no difference in terms of performance and just be easier to load the entire image into a UIImageView? Thanks in advance for all your wisdom!

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  • Maximum capabilities of MySQL

    - by cdated
    How do I know when a project is just to big for MySQL and I should use something with a better reputation for scalability? Is there a max database size for MySQL before degradation of performance occurs? What factors contribute to MySQL not being a viable option compared to a commercial DBMS like Oracle or SQL Server?

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  • Keep PyGTK Button from Resizing on Label Change

    - by Cap
    I'm working on a PyGTK app with some Buttons that, when clicked, give a text entry dialog, then set the text on the button to whatever was entered in the box. The problem is that if the text is longer than the button can show, the button changes size to accomodate. How do I keep GTK Buttons from resizing when the text changes?

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  • Image upload not functioning correctly

    - by PurpleSmurf
    I'm still trying to get to grips with PHP, and I'm trying to make a form that uploads a picture to a database. I don't have permissions for move_uploaded_file so I'm using the copy() as an alternative. Everywhere I've seen experiencing similar problems have all been with move_uploaded_file so I'm rather stuck. Trying to copy the image from the desktop doesn't seem to be working, it's not throwing up any more PHP errors but is displaying the error message for if something goes wrong. The form sends data to two tables in the database but I'm mainly concerned with the upload not working. There's over 200 lines so I'll post a snippet of the upload code, thank you in advance: function getExtension($str) { $i = strrpos($str,"."); if (!$i) { return ""; } $l = strlen($str) - $i; $ext = substr($str,$i+1,$l); return $ext; } //This variable is used as a flag. The value is initialized with 0 (meaning no error found) and it will be changed to 1 if an errro occures. If the error occures the file will not be uploaded. $errors=0; //checks if the form has been submitted if(isset($_POST['submitted'])) { //reads the name of the file the user submitted for uploading $image=$_FILES['image']['name']; //if it is not empty if ($image) { //get the original name of the file from the clients machine $filename = stripslashes($_FILES['image']['name']); //get the extension of the file in a lower case format $extension = getExtension($filename); $extension = strtolower($extension); //if it is unknown extension, class as an error and do not upload the file, otherwise continue if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) { //print error message echo '<h1>Unknown extension!</h1>'; $errors=1; } else { //get the size of the image in bytes //$_FILES['image']['tmp_name'] is the temporary filename of the file in which the uploaded file was stored on the server $size=filesize($_FILES['image']['tmp_name']); //give an unique name, for example the time in unix time format $image_name=time().'.'.$extension; //the new name will be containing the full path where will be stored (images folder) $newname="/home/k0929907/www/uploads/".$image_name; //verify if the image has been uploaded, and print error instead $copied = copy($_FILES['image']['tmp_name'], $newname); if (!$copied) { echo '<h1>Copy unsuccessfull!</h1>'; $errors=1; } } } }

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  • Clip a 4:3 image in WPF with a circle

    - by reckoner
    I am trying to clip a 4:3 image with a circle within a grid control. I need the circle clip to reveal the image from the middle in a perfect circle. See below. The circle should dynamically re-size with the image. I have tried Canvas.Clip and Ellipse+VisualBrush without achieving the correct behavior. Thanks!

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