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  • What is the n in O(n) when comparing sorting algorithms?

    - by Mumfi
    The question is rather simple, but I just can't find a good enough answer. I've taken a look at the most upvoted question regarding the Big-Oh notation, namely this: Plain English explanation of Big O It says there that: For example, sorting algorithms are typically compared based on comparison operations (comparing two nodes to determine their relative ordering). Now let's consider the simple bubble sort algorithm: for (int i = arr.length - 1; i > 0 ; i--) { for (int j = 0; j<i; j++) { if (arr[j] > arr[j+1]) { switchPlaces(...) } } } I know that worst case is O(n^2) and best case is O(n), but what is n exactly? If we attempt to sort an already sorted algorithm (best case), we would end up doing nothing, so why is it still O(n)? We are looping through 2 for-loops still, so if anything it should be O(n^2). n can't be the number of comparison operations, because we still compare all the elements, right? This confuses me, and I appreciate if someone could help me.

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  • AS3 Random repeat x seconds function

    - by Lilk
    Hi, I have the following function: function update(e:Event):void { var val:Number = Math.random() * 120; rgb.r.x = rgb.r.y = val; rgb.b.x = rgb.b.y = -val; } And im looping it with: stage.addEventListener(Event.ENTER_FRAME, update); But what I need to do would be something like: Random number between 1 and 20 If the number is > 10 Call function Update and keep caling it for 20 seconds else do nothing for 10 seconds Repeat this block of code forever Can someone help me write this please?

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  • Returning the size of available virtual memory at run-time in C++

    - by Greenhouse Gases
    In C++ is there a predefined library function that will return the size of RAM currently available on a computer a program is being run on, at run-time? For instance, if an object is 4bytes, then can we divide the available virtual memory by 4 bytes to give an estimate of how many more objects could be stored by the program safely? I have used the sizeof() function to return the size of objects within my program. Thanks

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  • If element has been 'mouseover'ed for 500ms, run function with jQuery

    - by PaulAdamDavis
    For the sanity of my users, I want a 'mouseover' event to run after the selector has been hovered for half a second rather than as soon as they hover it. I first tried a setTimeout function but that runs however long the element has been hovered, I didn't think it through too much I guess. I've also spent a day (on and off) searching (and playing Pacman) ti no result, unless I'm searching for the wrong things. I would like to keep this plugin-less if we can, purely for run speed & maintainability. $("#mySelector").mouseover(function(){ // Run after 500ms $(this).addClass("hasBeen500ms"); }); Let's see if we can crack this, I know it will have so many applications!

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  • Problem running firefox built from source (on Ubuntu 9.10)

    - by Markus O'Reilly
    The title of the question sums it up pretty well. I've downloaded the source for firefox 3.6 and built it (no errors), but when I try to run it, I get a warning that says: (firefox-bin:2857): GLib-WARNING **: g_set_prgname() called multiple times I'm not sure what to try now. Any suggestions? Or even a better place to ask this question? *EDIT - It's not that I only get a warning, that wouldn't bother me. The problem is that the warning is the only thing that ever happens (no firefox windows show up or anything). When I run it from the terminal, that warning shows up twice and then nothing else happens (it just hangs and I have to Ctrl-C it).

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  • Best way to reverse a string in C# 2.0

    - by Guy
    I've just had to write a string reverse function in C# 2.0 (i.e. LINQ not available) and came up with this: public string Reverse(string text) { char[] cArray = text.ToCharArray(); string reverse = String.Empty; for (int i = cArray.Length - 1; i > -1; i--) { reverse += cArray[i]; } return reverse; } Personally I'm not crazy about the function and am convinced that there's a better way to do it. Is there?

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  • Wait set time for user input C# console app

    - by Marlon
    For a Console app, I need to know how to wait at set amount of time (about 10 seconds), for a user to input a key or set of keys, before proceeding with an 'auto run' portion of the application. This is bugging me because I can't quite figure out how the timer works, or threading.sleep, what should I use? Been googling all day.

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  • Time not entered in mysql ? Java

    - by Nitesh Panchal
    Hello, I have a datetime field in mysql table and i am using JPA for persisting data but only date goes in database. Time always shows 00:00:00. What should i do? I am not doing any manipulation with Date. All i do is to assign new Date() to a variable and store it in database. What am i doing wrong?

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  • run multiple webservices at a time

    - by Prajakta
    Hello, I have written a webservice which is taking URL as an input and producing a JSON respone. My problem is that now I have list of 1000 URLs and want to execute maximum threads of Webapplications to get output. Like I want to execute 100 instances of webservice at a time to get response.Please can anybody give some guidance how can I do it using java. Thank you in advance

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  • Python/Django tests running only one test at a time

    - by user2876296
    I have a unittest for my view class TestFromAllAdd(TestCase): fixtures = ['staging_accounts_user.json', 'staging_main_category.json', 'staging_main_dashboard.json', 'staging_main_location.json', 'staging_main_product.json', 'staging_main_shoppinglist.json'] def setUp(self): self.factory = RequestFactory() self.c = Client() self.c.login(username='admin', password='admin') def from_all_products_html404_test(self): request = self.factory.post('main/adding_from_all_products', {'product_id': ''}) request.user = User.objects.get(username= 'admin') response = adding_from_all_products(request) self.assertEqual(response.status_code, 404) But I have a few more classes with tests and I cant run them all at the same time: python manage.py test main doesnt run tests, but if i run; python manage.py test main.TestFromAllAdd.from_all_products_html404_test , runs one test;

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