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• Which parallel sorting algorithm has the best average case performance?

  - by Craig P. Motlin

  Sorting takes O(n log n) in the serial case. If we have O(n) processors we would hope for a linear speedup. O(log n) parallel algorithms exist but they have a very high constant. They also aren't applicable on commodity hardware which doesn't have anywhere near O(n) processors. With p processors, reasonable algorithms should take O(n/p log n/p) time. In the serial case, quick sort has the best runtime complexity on average. A parallel quick sort algorithm is easy to implement (see here and here). However it doesn't perform well since the very first step is to partition the whole collection on a single core. I have found information on many parallel sort algorithms but so far I have not seen anything pointing to a clear winner. I'm looking to sort lists of 1 million to 100 million elements in a JVM language running on 8 to 32 cores.

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• design function: underlying structure to store list of results for print to file

  - by forest.peterson

  is this a good approach to print a list of items to csv file with a sublist attached to each item. The gist of the function is when an item is found that does not exactly macth then a list of close matches is generated - this works now writing out one list at a time to a command window. For export to a csv file I think all the lists must be generated, stored and then written at once. Right now I use a struct to store the attributes printed, each struct is an item on the list - these structs are then added to a sorted stack and when printed they pop off into write out. Is a stack of stacks of structs a good design?

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• Emacs: print key binding for a command or list all key bindings

  - by Yktula

  In Emacs (GNU 23.2, *nix), how can I: list the key sequences bound to a particular command? For example, how can we list all the key sequences that execute save-buffers-kill-emacs, with the output of key sequences bound to it? Assuming we can do this, listing the key sequences bound to goto-line should print the output: M-g g on a default install. list all key-bindings? Does C-h b do this? Would it print my own bindings? I am aware that executing the command directly can print a key sequence it can be activated with, but it doesn't always do so, and a few things happen, including: (1) the output doesn't remain for long, (2) the command is executed. I want a command that lists for me (preferably all) the bindings attached to a given command, without executing the command, or something like that.

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• Visual Studio 2005 Build Order

  - by user77826

  I have a Web Application. Sometimes I want to debug a console app that is within the solution. Why is it that when I right click on it and select debug, it builds every single webpage and libraries, which takes a while. When I look at build dependencies for the console app, it lists everything in the solution as the order and tells me to go to build order to change it. In build order, everything checks out... I only have checked the libraries that this console app needs. I also tried setting this console app as a start up project. Same thing... How do I get it so when I want to debug this console app, it only builds that and runs instead of building the entire solution before running?

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• Best practices: displaying text that was input via multi-line text box

  - by chris

  I have a multi-line text box. When users simply type away, the text box wraps the text, and it's saved as a single line. It's also possible that users may enter line breaks, for example when entering a "bulleted" lists like: Here are some suggestions: - fix this - remove that - and another thing Now, the problem occurs when I try to display the value of this field. In order to preserve the formatting, I currently wrap the presentation in <pre> - this works to preserve user-supplied breaks, but when there's a lot of text saved as a single line, it displays the whole text block as single line, resulting in horizontal scrolling being needed to see everything. Is there a graceful way to handle both of these cases?

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• Select all items of union but not the last one!

  - by 100r

  I have few texboxes, dropdown lists, etc.. They have their css classes. I want to select all elements of specific class(es) but NOT the last element from group of all classes. <asp:TextBox ID="TextBox1" runat="server" CssClass="class1" ></asp:TextBox> <asp:TextBox ID="TextBox2" runat="server" CssClass="class2" ></asp:TextBox> <asp:TextBox ID="TextBox3" runat="server" CssClass="class2" ></asp:TextBox> I want to select only TextBox1 and TextBox2, not TextBox3! selector should be something like this $("(.class1,.class1):not(:last)") or something like $(".class1,.class1").filter(":not(:last)") but of course none of it is working :) any sugestions? tnx in advance!

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• Can I batch based on a Property (not just Items)?

  - by Josh Buedel

  I have a property group, like so: <PropertyGroup> <Platform>Win32;x64</Platform> </PropertyGroup> And I want to batch in an Exec task, like so: <Exec Command='devenv MySolution.sln /Build "Release|%(Platform)"' /> But of course, as written I get an error: error MSB4095: The item metadata %(Platform) is being referenced without an item name. Specify the item name by using %(itemname.Platform). Can I batch tasks on properties that are lists? I suppose I could hack it by creating a placeholder ItemGroup with metadata and batch on that.

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• Is there an easier way to reconcile a list of files and a directory with subfolders/files to find ch

  - by rwmnau

  I have a SQL Server table with a list of files (path + filename), and a folder with multiple layers and files in each layer. I'm looking for a way to reconcile the two without having to process the list twice. Currently, I'm doing this: For Each f as FileInfo In FileListFromDatabase If f.Exists is False, mark it as deleted in the database Next For Each f as FileInfo In RecursiveListOFFilesOnDisk If Not FileExistsInDatabase, then add it Next Is there a better way to do this? I'd like to avoid converting all the matching files (of which most will be) to FileInfo objects twice. Since I'm a T-SQL developer first, I'm picturing something like an OUTER JOIN of the two lists where they don't match. Something LINQ-ish?

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• Use count or have a field that tallies?

  - by Dan LaManna

  Fairly simple concept, making an extremely basic message board system and I want users to have a post count. Now I was debating on whether or not to have a tally in their row that is added each time a post by them is created, or subtracted by one each time a post of theirs is deleted. However I'm sure that performing a count query when the post count is requested would be more accurate due to unforseen circumstances (say a thread gets deleted and it doesn't lower their tally properly), however this seems like it would be less efficient to run a query EVERY time their post count is loaded, especially in the case of them having 10 posts on the same page and it lists their post count each post. Thoughts/Advice? Thanks

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• Mvc3 IEnumerable<QuestionModel> have a List<QuestionOptionModel> property. When I post, I get null list

  - by user1649439

  There is a example here. I am trying to use this technique in a large form with a list(List) but when I post back, the Viewmodel.Order that should’ve contained list of items and activities return with the lists empty. My QuestionModel.cs like this. public int Id { get; set; } public string QuestionText { get; set; } public System.Nullable<bool> OptionType1 { get; set; } public System.Nullable<bool> OptionType2 { get; set; } public List<QuestionOptionModel> OptionList = new List<QuestionOptionModel>(); When I post back "IEnumerable questions" List OptionList comes null. How can I do this?

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• JQUERY, getting two BINDs/Clicks to play nice together?

  - by nobosh

  I have the following line of code: <li id="1" class=" "> <a href="">Parking Lot</a> <span id="1" class="list-edit">edit</span> </li> I then have two binds: $("#lists li").click(function(){....... $(".list-edit").click(function(){......... The problem I'm having is I need the LI to contain the EDIT span because of CSS styling reasons, I have a big blue background. But this is preventing me from binding the EDIT btn. Is there a way to get these two to play nice? Thxs

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• Python - Create a list with initial capacity

  - by Claudiu

  Code like this often happens: l = [] while foo: #baz l.append(bar) #qux This is really slow if you're about to append thousands of elements to your list, as the list will have to constantly be re-initialized to grow. (I understand that lists aren't just wrappers around some array-type-thing, but something more complicated. I think this still applies, though; let me know if not). In Java, you can create an ArrayList with an initial capacity. If you have some idea how big your list will be, this will be a lot more efficient. I understand that code like this can often be re-factored into a list comprehension. If the for/while loop is very complicated, though, this is unfeasible. Is there any equivalent for us python programmers?

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• difference between 2 pieces Python code

  - by draw

  Hello, I'm doing an exercise as following: # B. front_x # Given a list of strings, return a list with the strings # in sorted order, except group all the strings that begin with 'x' first. # e.g. ['mix', 'xyz', 'apple', 'xanadu', 'aardvark'] yields # ['xanadu', 'xyz', 'aardvark', 'apple', 'mix'] # Hint: this can be done by making 2 lists and sorting each of them # before combining them. sample solution: def front_x(words): listX = [] listO = [] for w in words: if w.startswith('x'): listX.append(w) else: listO.append(w) listX.sort() listO.sort() return listX + listO my solution: def front_x(words): listX = [] for w in words: if w.startswith('x'): listX.append(w) words.remove(w) listX.sort() words.sort() return listX + words as I tested my solution, the result is a little weird. Here is the source code with my solution: http://dl.dropbox.com/u/559353/list1.py. You might want to try it out.

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• Which PHP calendar will suit my needs? Or build my own?

  - by John

  There are so many web based calendars out there that I'm not sure which will best suit my purposes. I want to create an events calendar, which I suppose looks and functions in much the same way as google calendar. But users shouldn't need to sign up for a gmail account or a google account. Users of my social network website should be able to create events in the calendar and share it with other friends in their "friend network". In month, year or day views, you can mouse hover events to see a bubble dialog that lists events in detail. People need to pay a monthly fee to use my website (not sure if this prevents me from using google apps). So is something like Google Calendar the way to go? Or are there other php/javascript calendars out there that already meet my needs? Or will it just save me more time to build my own?

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• What are the requirements of a collection type when model binding?

  - by Richard Ev

  I have been reviewing model binding with collections, specifically going through this article http://weblogs.asp.net/nmarun/archive/2010/03/13/asp-net-mvc-2-model-binding-for-a-collection.aspx However, the model I would like to use in my code does not implement collections using generic lists. Instead it uses its own collection classes, which inherit from a custom generic collection base class, the declaration of which is public abstract class CollectionBase<T> : IEnumerable<T> The collections in my POSTed action method are all non-null, but contain no elements. Can anyone advise?

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• What is the best way to do multiple listviews in android?

  - by Nicos

  Hi all, i am writing a software that i have to drill down on content a lot. For example when the program starts a listview is displayed. When user clicks on an item, then a second listview must be displayed. For example: Select Continent Select Country Select State Select City Select Address What is the best way to do this (less memory, faster, easier to code etc)? To create multiple listviews with multiple adapters? Or 1 listview with multiple Adapters? Lists are loaded from an external XML File. So far i am creating a new adapter and setting it to the listview. How do i create a second listview and after clicking on 1st listview displaying the second one, with animation. Any examples? Extend my class to ListActivity or Activity? Best regards and thanks for helping, Nicos

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• C++ wrapper for C library

  - by Maximilien

  Hi, Recently I found a C library that I want to use in my C++ project. This code is configured with global variables and writes it's output to memory pointed by static pointers. When I execute my project I would like 2 instances of the C program to run: one with configuration A and one with configuration B. I can't afford to run my program twice, so I think there are 2 options: Make a C++ wrapper: The problem here is that the wrapper-class should contain all global/static variables the C library has. Since the functions in the C library use those variables I will have to create very big argument-lists for those functions. Copy-paste the C library: Here I'll have to adapt the name of every function and every variable inside the C library. Which one is the fastest solution? Are there other possibilities to run 2 instances of the same C source? Thanks, Max

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• odd behavior with java collections of parameterized Class objects

  - by Paul

  Ran into some questionable behavior using lists of parameterized Class objects: ArrayList<Class<String>> classList = new ArrayList<Class<String>>(); classList.add(Integer.class); //compile error Class intClass = Integer.class; classList.add(intClass); //legal apparently, as long as intClass is not parameterized Found the same behavior for LinkedList, haven't tried other collections. Is it like this for a reason? Or have I stumbled on something?

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• python input for itertools.product

  - by user364249

  Looking for a way to simulate nested loops (or a cartesian product) i came across the itertools.product function. i need a function or piece of code that receive a list of integers as input and returns a specific generator. example: input = [3,2,4] - gen = product(xrange(3),xrange(2),xrange(4)) or input = [2,4,5,6] - gen = product(xrange(2),xrange(4),xrange(5),xrange(6)) as the size of the lists varies i am very confused in how to do that without the need of a lot of precoding based on a crazy amount of ifs and the size of the list. also is there a difference in calling product(range(3)) or product(xrange(3))?

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• More elegant way to initialize list of duplicated items in Python

  - by Claudiu

  If I want a list initialized to 5 zeroes, that's very nice and easy: [0] * 5 However if I change my code to put a more complicated data structure, like a list of zeroes: [[0]] * 5 will not work as intended, since it'll be 10 copies of the same list. I have to do: [[0] for i in xrange(5)] that feels bulky and uses a variable so sometimes I even do: [[0] for _ in " "] But then if i want a list of lists of zeros it gets uglier: [[[0] for _ in " "] for _ in " "] all this instead of what I want to do: [[[0]]*5]*5 Has anyone found an elegant way to deal with this "problem"?

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• Delete current row in a <table> with jQuery

  - by omgkurtnilsen

  I have a table that lists a bunch of customers. The last cell is an ajax delete button. I want the row containing the deleted customer to be deleted through jQuery. <table> <tr><td>Customer info 1</td><td><a href="javascript:deleteCustomer(1);">Delete</a></td> <tr><td>Customer info 2</td><td><a href="javascript:deleteCustomer(2);">Delete</a></td> function deleteCustomer(customerId) { $.post("somepage.php", {cid:customerId}, function(data){ //...delete the row that called the function... }

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• svn stat says folder uncontrolled, but won't let me svn add it!

  - by user246114

  Hi, Running into a weird problem with svm. I do svn stat in my controlled directory, lists something like: ? myproject/foo ? myproject/zoo so I do: svn add myproject/zoo and then I get this message back: svn: warning: 'myproject/zoo' is already under version control I don't get it, why is it showing it as uncontrolled then? I tried running svn cleanup, svn update, nothing though. I am also looking at my svn project in tracker, and I don't see the /zoo folder as present. What can I do to convince svn it's not really added? Thanks

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• OpenGL "out of memory" on glReadPixels()

  - by spurserh

  Hello, I am running into an "out of memory" error from OpenGL on glReadPixels() under low-memory conditions. I am writing a plug-in to a program that has a robust heap mechanism for such situations, but I have no idea whether or how OpenGL could be made to use it for application memory management. The notion that this is even possible came to my attention through this [albeit dated] thread on a similar issue under Mac OS X: http://lists.apple.com/archives/Mac-opengl/2001/Sep/msg00042.html I am using Windows XP, and have seen it on multiple NVidia cards. I am also interested in any work-arounds I might be able to relay to users (the thread mentions "increasing virtual memory"). Thanks, Sean

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• Adding a row to a ListView that displays "Loading" while information is downloaded. Like in the Market.

  - by user577139

  I've tried, but have had no luck trying to find this answer elsewhere. I want to add a row to the bottom of my listview that displays "Loading..." and maybe a spinning progress indicator. My program already loads additional information into the listview once the user scrolls to the bottom. But I want the user to be able to see that the program is indeed loading something. Example: If you go to the android marketplace and scroll to the bottom of one of the lists, the last row will say "Loading...". Then once the data is loaded, that bar is replaced with the first item of the new data. Sorry, it's a little hard to describe. I am NOT trying to add a footer to the bottom of the list view. I want it to be an actual item in the listview.

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• what is a good way to do countif in python

  - by tolomea

  I want to count how many members of an iterable meet a given condition. I'd like to do it in a way that is clear and simple and preferably reasonably optimal. My current best ideas are: sum(meets_condition(x) for x in my_list) and len([x for x in my_list if meets_condition(x)]) The first one being iterator based is presumably faster for big lists. And it's the same form as you'd use for testing any and all. However it depends on the fact that int(True) == 1, which is somewhat ugly. The second one seems easier to read to me, but it is different from the any and all forms. Does anyone have any better suggestions? is there a library function somewhere that I am missing?

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