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• Whats the best data-structure for storing 2-tuple (a, b) which support adding, deleting tuples and c

  - by bhups

  Hi So here is my problem. I want to store 2-tuple (key, val) and want to perform following operations: - keys are strings and values are Integers - multiple keys can have same value - adding new tuples - updating any key with new value (any new value or updated value is greater than the previous one, like timestamps) - fetching all the keys with values less than or greater than given value - deleting tuples. Hash seems to be the obvious choice for updating the key's value but then lookups via values will be going to take longer (O(n)). The other option is balanced binary search tree with key and value switched. So now lookups via values will be fast (O(lg(n))) but updating a key will take (O(n)). So is there any data-structure which can be used to address these issues? Thanks.

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• How do you keep track of what the industry is up to?

  - by BlairHippo

  A discussion elsewhere made me realize that I don't do a particularly good job of following the software industry. My exposure to new trends or technologies is haphazard at best, often limited to a "Hey, that sounds interesting" when I see people discussing something I'm not familiar with on SO. To abuse a metaphor, I'm quite familiar with the tree where I work, but I know too bloody little about the rest of the forest. How do other folks keep abreast of what's going on in the software industry? Are there any sites/blogs/podcasts/whatever that you find particularly valuable for keeping you informed of potentially useful new technologies or industry-wide trends? (My apologies in advance if this is a duplicate; this feels like something that ought to have been asked before, but alas, my search-fu has failed me.)

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• Problem doing SVN Vendor Branch - merge

  - by Gyan

  Hi, I am trying to use the svn vendor branch to upgrade the third party library. (We have modified the source code) I followed all the steps to create the vendor branch:: created the vendor branch for old version (3rd party library) created the vendor branch for latest version (3rd party library) copied the latest version to current folder using (usign svn_load_dirs.pl script) structure of vendor repository in svn URL/vendor/library/3.5.0 URL/vendor/library/3.7.0 URL/vendor/library/current I have the library-3.5.0 used/modified at URL/trunk/library/customized-library I have a problem when I try to merge the difference between URL/vendor/library/3.7.0 and URL/vendor/library/3.5.0 to URL/trunk/library/customized-library I am at the folder where URL/trunk/library/customized-library is checked out and I use following command to do the merge svn merge URL/vendor/library/3.5.0 URL/vendor/library/current . --accept PARAMETERS when I use theirs-conflict for accept parameter, It ignores all of my changes to the old version and copies files from 3.7.0 when I user mine-conflict, it ignores the files in 3.7.0 when I use postpone, it throws exception "tree conflict" Thanks Gyan

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• Treeview DatafieldParentID Bind to Object whose property is a another object

  - by user228777

  I am trying to bind Generic collection to a Rad Treeview control. In following case CategoryCollection Returns collection of Category Object, which has bunch of properties and A Parent property which is a object and this parent object Has Id and text properties. What I am trying to do is: I want to Bind DataFieldParentID of the tree view to CategoryCollection.Parent.Id. How do I do that? Dim tvCategory As RadTreeView = DirectCast(cboCategory.Items(0).FindControl("tvCategory"), RadTreeView) With tvCategory .DataSource = CategoryCollection .DataTextField = "Name" .DataValueField = "ID" .DataFieldID = "ID" .DataFieldParentID = "Parent.ID" .DataBind() End With Thank You

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• Override An Existing Property as a Child form of its return type

  - by Jason

  I apologize if that title is confusing. This question may be a result of lack of coffee and/or sleep, but my mind is not working correctly right now. Anyways, I have an inheritance tree like such (I know the architecture isn't ideal): BaseClass GeneralForm : Inherits BaseClass SpecificForm : Inherits GeneralForm And an object like so: MyItem MySpecificItem : Inherits MyItem I have Items As List (Of MyItem) as a property in BaseClass. I would like for SpecificForm to somehow override Items to return type List (Of MySpecificItem). I feel like this is easy to do, but again, my head is spinning and I can't think straight at the moment. Thank you so much in advance.

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• How to organize XIB files with many overlapping elements?

  - by alltom

  I have some XIB files which are very difficult to edit because many of the subviews overlap each other completely. For example, if I position a popup volume slider where it will pop up, it covers some UILabels which become impossible to click. My only chance to be able to edit them is to double-click on them in the Document window tree, move them aside, edit, then move them back. Sometimes there are 3 or more widgets that occupy the same location in the XIB, even though only a few are visible at a time while the application is running. How are conditionally-visible screen elements actually supposed to be organized? I would like to be able to hide groups of views to reveal what's beneath them, but I don't see a way to do that in IB. If I create UIViewControllers for every group, I can edit them in separate windows, but I can't see them in context, and I need a lot of view controllers...

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• How do I store in subversion my customizations to a public open source project?

  - by Clyde

  Hi, I'm working on customizing a couple of open source projects in ways that are very much personalized -- i.e., not appropriate to send the patches back to the maintainers for the public. One of them is stored in CVS, one in SVN. I use SVN for my own work. The CVS project is fine. I check the tree in to my svn repository, including the CVS directories. I can commit all my changes, and still do a cvs update to stay up to date with bug fixes/features of the public project. How should I work on the svn project? Is there a 'best practice' or known procedure for this kind of scenario?

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• Effecient data structure design

  - by Sway

  Hi there, I need to match a series of user inputed words against a large dictionary of words (to ensure the entered value exists). So if the user entered: "orange" it should match an entry "orange' in the dictionary. Now the catch is that the user can also enter a wildcard or series of wildcard characters like say "or__ge" which would also match "orange" The key requirements are: * this should be as fast as possible. * use the smallest amount of memory to achieve it. If the size of the word list was small I could use a string containing all the words and use regular expressions. however given that the word list could contain potentially hundreds of thousands of enteries I'm assuming this wouldn't work. So is some sort of 'tree' be the way to go for this...? Any thoughts or suggestions on this would be totally appreciated! Thanks in advance, Matt

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• SEF URL Problem in Joomla1.5

  - by Emrul Hasan

  My joomla site url is: http://www.cessnatrader.com. I am using SEF URL for this site. The SEF URL is not working in the main menu(in top). But it is working fine for other places(other links, footer menu). I don't know what the problem is. I did all the things for enabling SEF URL in joomla. But it is not working in one place(main menu). What should I do? Note: I am using "Mosets tree" component in this site.

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• Automated user testing with times

  - by Sean

  I am attempting to test user interaction with an off the shelf product. The current process is to run through a manual script and record how long certain processes take to populate data, it may populate a datagrid, a tree, a list box, etc... It will also need to be able record how long it takes to generate a pdf report. We do not require extremely accurate time just to the nearest second or less than a second. I need to know if there is a simple Automated testing product that will handle the above criteria.

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• From my code, I can't trace the out of bounds exception.

  - by Matt

  public override Models.CalculationNode Parse(string expression) { var calNode = new Models.CalculationNode(); int i = expression.Length; char[] x = expression.ToCharArray(); string temp = ""; //Backwards assembly of the tree //Right Node while (!IsOperator(x[i]) && i > 0) { if (!x[i].Equals(' ')) temp = x[i] + temp; i--; } } It has been a while since I've used trees and I'm getting an out of bounds exception in the while loop.

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• AutoMapper and Linq expression.

  - by Raffaeu

  I am exposing the Dto generated from AutoMapper to my WCF services. I would like to offer something like that from WCF: IList GetPersonByQuery(Expression predicate); Unfortunately I need back an expression tree of Person as my DAL doesn't know the DTO. I am trying this wihtout success: var func = new Func<Person, bool>(x => x.FirstName.Contains("John")); var funcDto = Mapper.Map<Func<Person, bool>, Func<PersonDto, bool>>(func); Console.WriteLine(func.ToString()); Console.WriteLine(funcDto.ToString()); THe error that I get is: ----> System.ArgumentException : Type 'System.Func`2[TestAutoMapper.PersonDto,System.Boolean]' does not have a default constructor Do you have any suggestions?

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• Dataset and Hierarchial Data How to Sort

  - by mdjtlj

  This is probably a dumb question, but I've hit a wall with this one at this current time. I have some data which is hierarchial in nature which is in an ADO.NEt dataset. The first field is the ID, the second is the Name, the third is the Parent ID. ID NAME Parent ID 1 Air Handling NULL 2 Compressor 1 3 Motor 4 4 Compressor 1 5 Motor 2 6 Controller 4 7 Controller 2 So the tree would look like the following: 1- Air Handling 4- Compressor 6 - Controller 3 - Motor 2- Compressor 7- Controller 5 - Motor What I'm trying to figure our is how to get the dataset in the same order that ths would be viewed in a treeview, which in this case is the levels at the appropriate levels for the nodes and then the children at the appropriate levels sorted by the name. It would be like binding this to a treeview and then simply working your way down the nodes to get the right order. Any links or direction would be greatly appreciated.

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• Fastest way of creating XML from parent-child table in c#?

  - by rudnev

  Assume we have some DataTable or IEnumerable with ChildID, ParentID and Title. We need to serialize it to XML like <Entity title=""> <Entity title=""></Entity> <Entity title=""></Entity> </Entity> As i found out, standard DataTable.GetXML() returns something different. I thought about initializing class tree like Entity e = new Entity(ID, Title, ParentEntityID) and then serializing it. Table is about 3000 elems. Is there faster way?

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• (Visual) C++ project dependency analysis

  - by polyglot

  I have a few large projects I am working on in my new place of work, which have a complicated set of statically linked library dependencies between them. The libs number around 40-50 and it's really hard to determine what the structure was initially meant to be, there isn't clear documentation on the full dependency map. What tools would anyone recommend to extract such data? Presumably, in the simplest manner, if did the following: define the set of paths which correspond to library units set all .cpp/.h files within those to belong to those compilation units capture the 1st order #include dependency tree One would have enough information to compose a map - refactor - and recompose the map, until one has created some order. I note that http://www.ndepend.com have something nice but that's exclusively .NET unfortunately. I read something about Doxygen being able accomplish some static dependency analysis with configuration; has anyone ever pressed it into service to accomplish such a task?

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• jQuery: How to hide all HTML elements which have a value greater than a certain value for a given ta

  - by Ankur

  I display elements in a hierarchy, clicking one displays the next set of elements in the hirearchy. Each element has a tag called "level" which has some value which is 1-.... (whatever the number of levels is for that branch of the tree). When an element is clicked I want the next elements to be displayed, but if an element is clicked and it's subelements have already been displayed I want to hide all subelements. More formally: when an element with level = x is clicked if no elements with level x are displayed then display all elements such that level = x+1 but if some elements with level x are displayed then hide all elements where level x How would I create a jQuery selector that captures this.

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• ASP.Net Treeview - Client side event handling (jQuery??)

  - by The Great Gonzo

  I have a Treeview (bog standard ASP.Net Treeview) that is bound to an Xml source which allows the user to navigate to various parts of our system. Nothing special.... However, I wanted to generate a breadcrumb for use in the main content area on the client side when the user clicks a node in the Treeview control. I know there are mechanisms available for breadcrumb generation (such as site maps) but for various reasons I need to do it when a node is clicked. So far hooking up a click event using the document ready function available as part of jQuery is easy. However, having spent sometime looking I can not see how I navigate back up the tree nodes to get to each parent nodes text value to build the breadcrumb. I have been playing with .parent(), .parents() and .closest() available via jQuery but don't seem to be getting anywhere. Has anyone done anything like this or can anyone provide a better method? Thanks in advance....

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• Choosing the right and learning assembler for compiler-writing

  - by X A

  I'm writing a compiler and I have gone through all the steps (tokenizing, parsing, syntax tree structures, etc.) that they show you in all the compiler books. (Please don't comment with the link to the "Resources for writing a compiler" question!). I have chosen to use NASM together with alink as my backend. Now my problem is: I just can't find any good resources for learning NASM and assembly in general. The wikibook (german) on x86 assembly is horrible. They don't even explain the code they write there, I currently can't even get simple things like adding 1 to 2 and outputting the result working. Where can I learn NASM x86 assembly?

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• Editing a TreeView node doesn't change the TreeNode Key

  - by Blitzz

  I have a TreeView with user-editable nodes. I like to use the node caption as key to my tree node : + Root |+ Node1 ||- SubNode1 ||- SubNode2 |+ Node2 ||- SubNode3 ||- SubNode4 So I can reach a node like this: MyTreeView.Nodes["Root"].Nodes["Node2"].Nodes["SubNode3"] The problem is that, as I allow the user to rename any node, I would need also to change the key of my node in its parent in the AfterLabelEdit handler... which seems (logically) not to be done automatically. Unfortunately, Nodes["blabla"] is readonly, Nodes.Add(string Key, TreeNode Node) doesn't exist, and I can't find a way to do this without throwing (sooner or later) a bad exception. Any idea ?

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• Implementing Tagging using Core Data on the iPhone

  - by Jonathan Penn

  I have an application that uses CoreData and I'm trying to figure out the best way to implement tagging and filtering by tag. For my purposes, if I was doing this in raw SQLite I would only need three tables, tags, item_tags and of course my items table. Then filtering would be as simple as joining between the three tables where only items are related to the given tags. Quite straightforward. But, is there a way to do this in CoreData and utilizing NSFetchedResultsController? It doesn't seem that NSPredicate give you the ability to filter through joins. NSPredicate's aren't full SQL anyway so I'm probably barking up the wrong tree there. I'm trying to avoid reimplementing my app using SQLite without CoreData since I'm enjoying the performance CoreData gives me in other areas. Yes, I did consider (and built a test implementation) diving into the raw SQLite that CoreData generates, but that's not future proof and I want to avoid that, too. Has anyone else tried to tackle tagging/filtering with CoreData in a UITableView with NSFetchedResultsController

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• Why is TreeSet<T> an internal type in .NET?

  - by Justin Niessner

  So, I was just digging around Reflector trying to find the implementation details of HashSet (out of sheer curiosity based on the answer to another question here) and noticed the following: internal class TreeSet<T> : ICollection<T>, IEnumerable<T>, ICollection, IEnumerable, ISerializable, IDeserializationCallback Without looking too deep into the details, it looks like a Self-Balancing Binary Search Tree. My question is, is there anybody out there with the insight as to why this class is internal? Is it simply because the other collection types use it internally and hide the complexities of a BST from the general masses...or am I way off base?

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• Problem with acceding in DOM with jQuery

  - by Tristan

  Hello, I changed the tree of my JSON-P output, and i cannot access to my object DOM anymore : Here's my output : jsonp1271634374310( {"Inter-Medias": {"name":"Inter-Medias","idGSP":"14","average":"80","services":"8.86"} }); And here's my jQuery script : success: function(data, textStatus, XMLHttpRequest){ widget = data.name; widget += data.average ; .... I know one level is missing, but if I try to do : data.Inter-Medias.name or data.name.name it's still not working. Any idea please ? I will have case where i'll have multiple Ojbect, so i want to display all of them, how to do that ? for (i=0;i < data.length;i++) Does it look right ? Bonus question : i understand function(data, textStatus, XMLHttpRequest) that in case of success this function is triggered, the data is what the script recieved from his request, but i have no idea what textStatus or XMLHttpRequest are here too and why ?! Thank you.

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• .classpath and .project - check into version control or not?

  - by amarillion

  I'm running an open source java project that consists of multiple modules in a tree of dependencies. All those modules are subdirectories in a subversion repository. For newcomers to our project, it's a lot of work to set all that up manually in eclipse. Not all our developers use eclipse. Nevertheless, we're considering to just check in the .classpath and .project files to help newcomers to get started. Is this a good idea? Or would that lead to constant conflicts in those files? Is there an alternative way to make the project easy to set up on eclipse?

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• Generic XML parser in Silverlight 3.0

  - by Ummar

  Hi I am developing an application in Silverlight 3.0, I want to make a generic parser of XML in it, as on every call to webservice I am receiving a different XML, I want to make it generic so that I receive an XML in native datastructure of C#? Please help me out? like I am getting XML like this one time <test> <node1></node1> <node2></node2> </test> and other time <mytest> <application name="XYZ">My Application</application> <application name="ABC">My Application</application> </mytest> I want the generic parser, e.g. it makes some tree structure of whole XML

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• Can I pass events like key strokes to another control in Silverlight?

  - by herzmeister der welten

  Can I pass events like key strokes to another control in Silverlight? Imagine I'm in a custom control that contains a Textbox and a Treeview. I'm listening to a Key event for the TextBox. When the user pushes the Arrow Up or Arrow Down key, I want the Treeview to behave as if it's itself who received that event, i.e. it should move the current selection up or down. The user shouldn't lose focus on the TextBox though so that they can continue typing. Is this possible? I don't want to set the selection manually on the Treeview because it has no easy MoveSelectionUp() or MoveSelectionDown() method, so I would have to duplicate that functionality which is not so trivial especially when the tree is databound and loads nodes on demand.

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