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  • Matrix "Zigzag" Reordering

    - by fbrereto
    I have an NxM matrix in Matlab that I would like to reorder in similar fashion to the way JPEG reorders its subblock pixels: (referenced from here) I would like the algorithm to be generic such that I can pass in a 2D matrix with any dimensions. I am a C++ programmer by trade and am very tempted to write an old school loop to accomplish this, but I suspect there is a better way to do it in Matlab.

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  • Parallel For Loop - Problems when adding to a List

    - by Kevin Crowell
    I am having some issues involving Parallel for loops and adding to a List. The problem is, the same code may generate different output at different times. I have set up some test code below. In this code, I create a List of 10,000 int values. 1/10th of the values will be 0, 1/10th of the values will be 1, all the way up to 1/10th of the values being 9. After setting up this List, I setup a Parallel for loop that iterates through the list. If the current number is 0, I add a value to a new List. After the Parallel for loop completes, I output the size of the list. The size should always be 1,000. Most of the time, the correct answer is given. However, I have seen 3 possible incorrect outcomes occur: The size of the list is less than 1,000 An IndexOutOfRangeException occurs @ doubleList.Add(0.0); An ArgumentException occurs @ doubleList.Add(0.0); The message for the ArgumentException given was: Destination array was not long enough. Check destIndex and length, and the array's lower bounds. What could be causing the errors? Is this a .Net bug? Is there something I can do to prevent this from happening? Please try the code for yourself. If you do not get an error, try it a few times. Please also note that you probably will not see any errors using a single-core machine. using System; using System.Collections.Generic; using System.Threading.Tasks; namespace ParallelTest { class Program { static void Main(string[] args) { List<int> intList = new List<int>(); List<double> doubleList = new List<double>(); for (int i = 0; i < 250; i++) { intList.Clear(); doubleList.Clear(); for (int j = 0; j < 10000; j++) { intList.Add(j % 10); } Parallel.For(0, intList.Count, j => { if (intList[j] == 0) { doubleList.Add(0.0); } }); if (doubleList.Count != 1000) { Console.WriteLine("On iteration " + i + ": List size = " + doubleList.Count); } } Console.WriteLine("\nPress any key to exit."); Console.ReadKey(); } } }

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  • NANT: ReplaceToken, loop over all properties defined in build

    - by SharePoint Newbie
    Hi, Is it possible to loop over all the properties and replace all token which correspond to them? For example, if I have three properties defined, a,b,c, I want to replace all three tokens @a@, @b@, @c@ . I however do not want to set up the filterchain manually as properties may be added/removed later on. I can accomplish this using a custom nant task, but is ther a way to do this through a build file alone. Thanks,

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  • Rails migration won't run, no error thrown

    - by kouak
    Here's a simple migration I'd like to run : class AddTimeOfRevisionToBrandWikis < ActiveRecord::Migration def self.up add_column :brand_wikis, :time_of_revision, :datetime end def self.down remove_column :brand_wikis, :time_of_revision end end Here's what I get when I try to run it : $ rake db:migrate (in /Users/kouak/Documents/workspace/wtb) You have 1 pending migrations: 20100404115341 AddTimeOfRevisionToBrandWikis Run "rake db:migrate" to update your database then try again. What's wrong with rake db:migrate ?

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  • How to loop a json array and update links

    - by azz0r
    Hello, On page load, I do one call to get the current status of all the favourite links (display the right message aka: click to subscribe, click to unsubscribe. So far I have the following code: $(InitFavorite); function InitFavorite(){ var jList = $(".favourite_link"); var ids_to_check = {};//new Array(); $.each(jList, function () { var id = this.id; var object = id.split("_"); if (!ids_to_check[object[1]]) { ids_to_check[object[1]] = []; } ids_to_check[object[1]].push(object[0]); }); //console.log(ids_to_check); $.ajax({ type: 'POST', url: '/user/subscription/favourite-listing', data: ids_to_check, dataType: 'json', beforeSend: function(x) { if(x && x.overrideMimeType) { x.overrideMimeType("application/j-son;charset=UTF-8"); } }, error: function() { alert(1); }, success: function(returned_values) { $.each(returned_values, function() { console.log($(this)); }) } }); } My returned data is: {"env":"development","loggedIn":true,"translate":{},"aaron":"{\"Playlist\":{\"10\":\"Stop Recieving Updates For This Playlist\"},\"Clip\":{\"26\":\"Recieve Updates For This Clip\",\"27\":\"Recieve Updates For This Clip\",\"28\":\"Recieve Updates For This Clip\",\"29\":\"Stop Recieving Updates For This Clip\",\"30\":\"Recieve Updates For This Clip\"}}"} I would like it to loop through the data and for example update the class <a href="/user/subscription/toggle/id/26/object/Clip" class="favourite_link" id="26_Clip"> <img src="/design/images/icon/subscribe.png"> Add Clip To Favourites</a> However eaching through returned_values equals this in firebug: ["{", """, "P", "l", "a", "y", "l", "i", "s", "t", """, ":", "{", """, "1", "0", """, ":", """, "S", "t", "o", "p", " ", "R", "e", "c", "i", "e", "v", "i", "n", "g", " ", "U", "p", "d", "a", "t", "e", "s", " ", "F", "o", "r", " ", "T", "h", "i", "s", " ", "P", "l", "a", "y", "l", "i", "s", "t", """, "}", ",", """, "C", "l", "i", "p", """, ":", "{", """, "2", "6", """, ":", """, "R", "e", "c", "i", "e", "v", "e", " ", "U", "p", "d", "a", "t", "e", "s", " ", "F", "o", "r", " ", "T", "h", "i", "s", " ", "C", "l", "i", "p", """, ",", """, "2", "7", """, ":", """, "R", "e", "c", "i", "e", "v", "e", " ", "U", "p", "d", "a", "t", "e", "s", " ", "F", "o", "r", " ", "T", "h", "i", "s", " ", "C", "l", "i", "p", """, ",", """, "2", "8", """, ":", """, "R", "e", "c", "i", "e", "v", "e", " ", "U", "p", "d", "a", "t", "e", "s", " ", "F", "o", "r", " ", "T", "h", "i", "s", " ", "C", "l", "i", "p", """, ",", """, "2", "9", """, ":", """, "S", "t", "o", "p", " ", "R", "e", "c", "i", "e", "v", "i", "n", "g", " ", "U", "p", "d", "a", "t", "e", "s", " ", "F", "o", "r", " ", "T", "h", "i", "s", " ", "C", "l", "i", "p", """, ",", """, "3", "0", """, ":", """, "R", "e", "c", "i", "e", "v", "e", " ", "U", "p", "d", "a", "t", "e", "s", " ", "F", "o", "r", " ", "T", "h", "i", "s", " ", "C", "l", "i", "p", """, "}", "}"] How would I successfully loop that json array? Many thanks

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  • Loop through children and display each, as3

    - by VideoDnd
    How do I loop through all of my children, and display each? I would like to know the best way to do this. my children and containerfive children, one plays every sec, 1,2,3, etc. var square1:Square1 = new Square1; var square2:Square2 = new Square2; var square3:Square3 = new Square3; var square4:Square4 = new Square4; var square5:Square5 = new Square5; var container:Sprite = new Sprite; addChild(container); container.addChild(square1) container.addChild(square2) container.addChild(square3) container.addChild(square4) container.addChild(square5) my timer var timly:Timer = new Timer(1000, 5); timly.start(); timly.addEventListener(TimerEvent.TIMER, onLoop); Note: Tried for loop, numChildren -1, and visibility ERROR 'access of undefined property' //Thomas's idea var timly:Timer = new Timer(1000, 10); timly.start(); timly.addEventListener(TimerEvent.TIMER, onLoop, false, 0, true); // var square1:Square1 = new Square1; square1.visible = false container.addChild(square2) var square2:Square2 = new Square2; square2.visible = false container.addChild(square3) var square3:Square3 = new Square3; square3.visible = false container.addChild(square3) var square4:Square4 = new Square4; square4.visible = false container.addChild(square4) var square5:Square5 = new Square5; square5.visible = false container.addChild(square5) var container:Sprite = new Sprite; this.addChild(container); var curCount:Number = 100; // function collectChildren(container:DisplayObjectContainer):Array { var len:int = container.numChildren; var mySquaresArray:Array = []; for (var i:int = 0; i < len; i++) { mySquaresArray.push(container.getChildAt(i).name); } return mySquaresArray; } // function onLoop( e:Event ) { curCount = e.target.currentCount; if( curCount > 1 ) { var previous_square = curCount -2; mySquaresArray[previous_square].visible = false; } var current_square = curCount - 1; mySquaresArray[current_square].visible = true; }

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  • What is the reason that can't cron automatic run?

    - by Jingqiang Zhang
    OS : Ubuntu 12.04 Now I want to use Backup and Whenever gem to automatic backup my database. When I connect the server by ssh as an added user to run backup perform -t my_backup,it works well.But the cron file: 0 22 * * * /bin/bash -l -c 'backup perform -t my_backup' can't run at 22:00. When I use cat /etc/crontab check the cron's config file,it is: SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) # The /bin/bash and /bin/sh are different.What's the reason?How to do?

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  • asp.net mvc user control problem foreach loop

    - by mazhar
    Previous post <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" % <% MvcApplication1.Models.FeaturesRepository _model = new MvcApplication1.Models.FeaturesRepository(); % <% foreach (var md in _model.GetAllFeatures()) { % <%--<% if (md.int_ParentId == 0) { %--% <%= md.vcr_FeaturesName % <%--<% } %--% <% } % It is with reference to the previous post above.Is there something wrong with the foreach loop(The result is correct but it is displaying the series of Add,Add,Add,Add,Add,Add...,which is the last record of the getallfeatures.

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  • JavaScript Loop and wait for function

    - by Fluidbyte
    I have a simple single-dimension array, let's say: fruits = ["apples","bananas","oranges","peaches","plums"]; I can loop thru with with $.each() function: $.each(fruits, function(index, fruit) { showFruit(fruit); }); but I'm calling to another function which I need to finish before moving on to the next item. So, if I have a function like this: function showFruit(fruit){ $.getScript('some/script.js',function(){ // Do stuff }) } What's the best way to make sure the previous fruit has been appended before moving on?

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  • Visual Studio detaches from application as soon as debugging starts

    - by rwmnau
    I have a web application that I've always been able to run in Visual Studio and it debugs just fine (breakpoints work, I can pause execution, etc). Recently, the behavior changed suddenly, and a few things happen: I start debugging, it lauches IE and loads the application, but after a few seconds (sometimes the page hasn't even displayed yet), Visual Studio acts as if debugging has stopped - I'm able to edit code in VS again, and the "Play" button on the toolbar is enabled. The application continues to run in the IE window just spawned, but I'm not attached to it During this few seconds that VS is "debugging", because it detaches, my breakpoints show as hollow - as if I'm set to "Release" mode and they won't be hit. In fact, I have a breakpoint set in Page_Load, and it skips right by. I've checked, and I'm set to debug mode, though the compile mode dropdown is missing from my toolbar (I checked in the build properties to ensure I was in debug mode). Can anybody shed some light here?

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  • compare two following values in numpy array

    - by Billy Mitchell
    What is the best way to touch two following values in an numpy array? example: npdata = np.array([13,15,20,25]) for i in range( len(npdata) ): print npdata[i] - npdata[i+1] this looks really messed up and additionally needs exception code for the last iteration of the loop. any ideas? Thanks!

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  • JQuery delay()-function breaks loop?

    - by Rakward
    I'm trying to fade an element in and out, but with a slight pause in between, it works without the pause, but when I add the pause using the jQuery delay()-function, it just stops; Here's the code: $('#headerimage2').each(function(){ for(i=1;i<50;i++){ $(this).fadeOut(1200).delay(1000).fadeIn(1000).delay(1000); } }); Why does the delay()-function (both first and second) break the loop?

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  • Empty "for" loop in Facebook ajax

    - by celticpride
    While surfing facebook and using the Firebug network debugger I noticed that facebook's AJAX responses all start with an empty for loop. Example: for(;;);{...} Does anyone know why this is done? I assume it's to prevent some sort of XSS attack but I don't totally understand. Thanks!

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  • Problem with continue in While Loop within Try/Catch in C# (2.0)

    - by csharpnoob
    Hi, when i try to use in my ASPX Webpage in the Code Behind this try{ while() { ... db.Open(); readDataMoney = new OleDbCommand("SELECT * FROM Customer WHERE card = '" + customer.card + "';", db).ExecuteReader(); while (readDataMoney.Read()) { try { if (!readDataMoney.IsDBNull(readDataMoney.GetOrdinal("Credit"))) { customer.credit = Convert.ToDouble(readDataMoney[readDataMoney.GetOrdinal("Credit")]); } if (!readDataMoney.IsDBNull(readDataMoney.GetOrdinal("Bonus"))) { customer.bonus = Convert.ToDouble(readDataMoney[readDataMoney.GetOrdinal("Bonus")]); } } catch (Exception ex) { Connector.writeLog("Money: " + ex.StackTrace + "" + ex.Message + "" + ex.Source); customer.credit = 0.0; customer.credit = 0.0; continue; } finally { } } readDataMoney.Close(); vsiDB.Close(); ... } }catch { continue; } The whole page hangs if there is a problem when the read from db isn't working. I tried to check for !isNull, but same problem. I have a lots of differend MDB Files to process, which are readonly (can't repair/compact) and some or others not. Same Design/Layout of Tables. With good old ASP Classic 3.0 all of them are processing with the "On Resume Next". I know I know. But that's how it is. Can't change the source. So the basic question: So is there any way to tell .NET to continue the loop whatever happens within the try loop if there is any exception? After a lots of wating time i get this exceptions: at System.Data.Common.UnsafeNativeMethods.IDBInitializeInitialize.Invoke(IntPtr pThis) at System.Data.OleDb.DataSourceWrapper.InitializeAndCreateSession(OleDbConnectionString constr, SessionWrapper& sessionWrapper) at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.OleDb.OleDbConnection.Open() at GetCustomer(String card)Thread was being aborted.System.Data and System.Runtime.InteropServices.Marshal.ReadInt16(IntPtr ptr, Int32 ofs) System.Data.ProviderBase.DbBuffer.ReadInt16(Int32 offset) System.Data.OleDb.ColumnBinding.Value_I2() System.Data.OleDb.ColumnBinding.Value() System.Data.OleDb.OleDbDataReader.GetValue(Int32 ordinal) System.Data.OleDb.OleDbDataReader.get_Item(Int32 index) Thread was terminated.mscorlib Thanks for any help.

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  • How to loop on a JSON object?

    - by Damiano
    Hello, I have this JSON object: {"time":"123456789", "raw":"chat_history", "data":{ "msg":[ {"time":1111111111, "user":"user1", "text":"text from user1"}, {"time":2222222222, "user":"user2", "text":"text from user2"}, {"time":3333333333, "user":"user3", "text":"text from user3"}, {"time":4444444444, "user":"user4", "text":"text from user4"} ] }} I have to create a FOR to loop the elements of data.msg and print it: I would print these results with the FOR: 11111111111 - user1 - text from users1 22222222222 - user2 - text from users2 33333333333 - user3 - text from users3 44444444444 - user4 - text from users4 Could you help me? Thank you very much

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  • Using strtok() in a loop in C?

    - by Alex Xander
    I am trying to use strtok() in nested loop. But this is not giving me desired results. Possibly because they are using same memory location. My code is of the form:- char *token1 = strtok(Str1, "%"); while(token1 != NULL ) { char *token2 = strtok(Str2, "%"); while(token2 != NULL ) { //DO SMTHING token2 = strtok(NULL, "%"); } token1 = strtok(NULL, "%"); // Do something more }

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  • Python loop | "do-while" over a tree

    - by johannix
    Is there a more Pythonic way to put this loop together?: while True: children = tree.getChildren() if not children: break tree = children[0] UPDATE: I think this syntax is probably what I'm going to go with: while tree.getChildren(): tree = tree.getChildren()[0]

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  • how can i loop through all of the columns of the OracleDataReader

    - by ooo
    I have the following code and i want to loop through all the fields in the result of this query and populate the dictionary called field. Given a datareader is this possible? OracleCommand command = connection.CreateCommand(); string sql = "Select * from MYTABLE where ID = " + id; command.CommandText = sql; Dictionary<string, string> fields = new Dictionary<string, string>(); OracleDataReader reader = command.ExecuteReader();

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  • Using a array variable in a foreach loop

    - by Jess McKenzie
    I am having an issue trying to work out how to use a function variable in a foreach loop so that I can do the following but its not working. $var = array(7) { [0]=> array(3) { ["listingId"]=> int(532712629) } [1]=> array(3) { ["listingId"]=> int(532712202) } Works but not right: foreach($var as $varr) { var_dump($varr['id']); { Goal - Having the array variable as the foreach value foreach($var['id'] as $item) { if($item === $foo) { } }

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  • Rails each loop insert tag every 6 items?

    - by dustmoo
    Hello Stack Anon, I have X number of image objects that I need to loop through in a view and want to create a new div every 6 objects or so (for a gallery). I have looked at cycle but it seems to change every other record. Does anyone know of a way to insert code into a view every 6 times? I could probably do it with nested loops but I am kinda stumped on this one. Thanks!

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