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  • Enumerating large (20-digit) [probable] prime numbers

    - by Paul Baker
    Given A, on the order of 10^20, I'd like to quickly obtain a list of the first few prime numbers greater than A. OK, my needs aren't quite that exact - it's alright if occasionally a composite number ends up on the list. What's the fastest way to enumerate the (probable) primes greater than A? Is there a quicker way than stepping through all of the integers greater than A (other than obvious multiples of say, 2 and 3) and performing a primality test for each of them? If not, and the only method is to test each integer, what primality test should I be using?

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  • trying to show/hide a div but something is not working

    - by Paul
    window.addEvent('domready', function(){ $('detail_block_table').addEvent('click', function(){ if ($('detail_showDiv').getStyle('display') == 'none') { $('detail_showDiv').setStyle('display','block'); } else { $('detail_showDiv').setStyle('display','none'); } }); }); This is the code, it looks fine but something prevents it from working. Any ideas?

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  • Open dot-file with dialogue in OSX

    - by Henrik Paul
    Since the GUI-side of OSX treats all dot-files (such as .htaccess) as hidden, it doesn't display them in any of the graphical UI:s, e.g. Finder or the Open-dialogues. How can I open a dot-file (.htaccess in this case) in a graphical editor, without doing that thing for all hidden files, universally and without going through Terminal.app? Edit: I'm on Leopard, if that makes a difference. Edit2: TextWrangler and TextMate seem to have features that allow you to open hidden files, which partly answers my question.

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  • How do I create and read non-global variables that aren't destroyed at end of function?

    - by Paul Reilly
    I am attempting to code some plugins to use with MIDI sequencers but have hit a stumbling block. I can't use global-scope variables to store information because multiple instances of the .dll can exist which share memory. How do I create a class (for re-usability purposes in other plugins) containing 2 dimensional array and other variables the content of which is to be shared between functions? If that is possible, how would I read and write the data from the function in the framework where I do the processing?

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  • How update dataset with datagrid view C#

    - by Paul
    I am beginner and I have this problem. How can I can update dataset with datagridview? I binding dataset in datagrid. Edit datagrid. At finish I want update dataset with datagridview. Thank you form any advice Sory, I use Winforms. Example: I bind dataset in datagridview. dataGridViewCustomers.DataSource = _ds.Tables[0]; //edit datagridview //on this place I want update dataset with datagrid view

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  • Is it possible to make JQuery keydown respond faster?

    - by Drew Paul
    I am writing a simple page with JQuery and HTML5 canvas tags where I move a shape on the canvas by pressing 'w' for up, 's' for down, 'a' for left, and 'd' for right. I have it all working, but I would like the shape to start moving at a constant speed upon striking a key. Right now there is some kind of hold period and then the movement starts. How can I get the movement to occur immediately? Here the important part of my code: Your browser does not support the HTML5 canvas tag. start navigating coords should pop up here key should pop up here var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); //keypress movements var xtriggered = 0; var keys = {}; var north = -10; var east = 10; var flipednorth = 0; $(document).ready(function(e){ $("input").keydown(function(){ keys[event.which] = true; if (event.which == 13) { event.preventDefault(); } //press w for north if (event.which == 87) { north++; flipednorth--; } //press s for south if (event.which == 83) { north--; flipednorth++; } //press d for east if (event.which == 68) { east++; } //press a for west if (event.which == 65) { east--; } var msg = 'x: ' + flipednorth*5 + ' y: ' + east*5; ctx.beginPath(); ctx.arc(east*6,flipednorth*6,40,0,2*Math.PI); ctx.stroke(); $('#soul2').html(msg); $('#soul3').html(event.which ); $("input").css("background-color","#FFFFCC"); }); $("input").keyup(function(){ delete keys[event.which]; $("input").css("background-color","#D6D6FF"); }); }); </script> please let me know if I shouldn't be posting code this lengthy.

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  • What features of Scala cannot be translated to Java?

    - by Paul
    The Scala compiler compiles direct to Java byte code (or .NET CIL). Some of the features of Scala could be re-done in Java straightforwardly (e.g. simple for comprehensions, classes, translating anonymous/inner functionc etc). What are the features that cannot be translated that way? That is presumably mostly of academic interest. More usefully, perhaps, what are the key features or idioms of Scala that YOU use that cannot be easily represented in Java? Are there any the other way about? Things that can be done straightforwardly in Java that have no straightforward equivalent in Scala? Idioms in Java that don't translate?

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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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  • CSS: Namespace a piece of HTML

    - by Paul Tarjan
    I'm building a browser extension that will insert a chunk of HTML into some pages. I'd like the page's CSS to not apply to this section. What is the best way to do this? Is there a good reset I can put on the root element of my HTML and set it to !important so it gets applied after others?

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  • How to parse the file name and rename in Matlab

    - by Paul
    I am reading a .xls file and then procesing it inside and rewriting it in the end of my program. I was wondering if someone can help me to parse the dates as my input file name is like file_1_2010_03_03.csv and i want my outputfile to be newfile_2010_03_03.xls is there a way to incorporate in matlab program so i do not have to manually write the command xlswrite('newfile_2010_03_03.xls', M); everytime and change the dates as i input files with diff dates like file_2_2010_03_04.csv. Thanks

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  • Scala's tuple unwrapping nuance

    - by Paul Milovanov
    I've noticed the following behavior in scala when trying to unwrap tuples into vals: scala> val (A, B, C) = (1, 2, 3) <console>:5: error: not found: value A val (A, B, C) = (1, 2, 3) ^ <console>:5: error: not found: value B val (A, B, C) = (1, 2, 3) ^ <console>:5: error: not found: value C val (A, B, C) = (1, 2, 3) ^ scala> val (u, v, w) = (1, 2, 3) u: Int = 1 v: Int = 2 w: Int = 3 Is that because scala's pattern matching mechanism automatically presumes that all identifiers starting with capitals within patterns are constants, or is that due to some other reason? Thanks!

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  • [Android] Text inserted in the edittext is overwritten

    - by Paul
    Hello.. I'm a beginner and am making a calculator (fairly easy), but it's happening the following problem: When Cline in "1" button for example, he enters this number in the EditText, but if you click again the number is overwritten instead of the inserted his side as desired. How do the numbers were placed side by side without overwriting those already there? Note: The layout of buttons and etc. I did in. XML, so I'm not using the keyboard native Android. Thanks!

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  • VirtualBox: How to connect to Internet via wi-fi on Mac?

    - by Paul Riedel
    I installed VirtualBox with a Win XP VM on my Mac running OS 10.7.5. My Mac only has a wi-fi connection to the internet. On the settings for the virtual host, I set: Attached to: Bridged Adapter Name: en1: Wi-Fi (AirPort) Adapter Type: Intel PRO/1000 MT Desktop (82540EM) Promiscuous Mode: Deny Mac Address: Cable Connected: true Those are the settings I see around the internet as being correct, but I still can't ping anything. On my Mac I have internet sharing via Ethernet enabled (not sure if that matters). When I start up my WinXP VM, it asks me to install a bunch of hardware which I don't have any drivers to. Do I need to install any ethernet card drivers in order for the internet to work? Thank you!!

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  • addEventListener using apply()

    - by Paul
    I'm trying to invoke addEventListener() using apply() method. The code is like: function rewrite(old){ return function(){ console.log( 'add something to ' + old.name ); old.apply(this, arguments); } } addEventListener=rewrite(addEventListener); It doesn't work. The code works for normal JavaScript method, for example, function hello_1(){ console.log("hello world 1!"); } hello_1=rewrite(hello_1); Need help! Thanks!

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  • JQuery datepicker numberOfMonths: display current selection month last

    - by Paul
    Hi, I have a jquery datepicker with the numberOfMonths set to 3, currently when I click on the datepicker, the left side month is the current month. In most cases, the user is only going to be selecting a date prior to todays date so I would prefer the current month selected to be the last calendar i.e. March, April, May instead of the current implementation which is May, June, July. Greatly appreciate any help!

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  • Tracking SVN changes through multiple merges

    - by Paul D.
    At work we use a branching strategy where all changes start off in a development branch, then subsequently make their way through one or more integration branches, and finally end up in a release branch. Occasionally (more often than I'd like) I find myself needing to figure out where a particular change originated (which development branch). In this case I have to spend a considerable amount of time playing detective to trace a change backwards through 2-3 merges. Am I missing an easy way to do this?

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  • skip reading headers in matlab

    - by Paul
    I had a similar question. but what i am trying now is to read files in .txt format into matlab. My problem is with the headers. Manytimes due to errors the system rewrites the headers in the middle of file and then matlab cannot read the file. IS there a way to skip it? I know i can skip reading some characters if i know what the character is. here is the code i am using. [c,pathc]=uigetfile({'*.txt'},'Select the data','V:\data); file=[pathc c]; data= dlmread(file, ',', 1,4); this way i let the user pick the file. My files are huge typically [ 86400 125 ] so naturally it has 125 header fields or more depends on files. Thanks Because the files are so big i cannot copy , but its in format like day time col1 col2 col3 col4 ............................... 2/3/2010 0:10 3.4 4.5 5.6 4.4 ............................... .................................................................. .................................................................. and so on

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  • Adding LambaExpression to an instance of IQueryable

    - by Paul Knopf
    ParameterExpression parameter = Expression.Parameter(typeof(Product), "x"); MemberExpression Left = Expression.MakeMemberAccess(parameter, typeof(Product).GetProperty("Name")); ConstantExpression Right = Expression.Constant(value, typeof(String)); BinaryExpression expression = Expression.Equal(Left, Right); LambdaExpression lambada = Expression.Lambda<Func<Product, bool>>(expression, parameter); Now how do I add this lambada to an instance of an IQuerybale, lets say _query _query.Where(lambada.Compile());?

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