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• Dynamic programming - Coin change decision problem?

  - by Tony

  I'm reviewing some old notes from my algorithms course and the dynamic programming problems are seeming a bit tricky to me. I have a problem where we have an unlimited supply of coins, with some denominations x1, x2, ... xn and we want to make change for some value X. We are trying to design a dynamic program to decide whether change for X can be made or not (not minimizing the number of coins, or returning which coins, just true or false). I've done some thinking about this problem, and I can see a recursive method of doing this where it's something like... MakeChange(X, x[1..n this is the coins]) for (int i = 1; i < n; i++) { if ( (X - x[i] ==0) || MakeChange(X - x[i]) ) return true; } return false; Converting this a dynamic program is not coming so easily to me. How might I approach this?

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• How to grey out spinner in Android?

  - by Janusz

  I use two Spinner in my App. One of them is initially disabled because I need the user to select something in the first spinner to load the content of the second one. I would like to change the design of the second spinner to show the user that the spinner is not active, eg. grey the spinner out. How can I achieve this? If this is not possible how would you change this dialog to make it clear to the user that she has to select something in the first spinner?

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• Implicit casting in VB.NET

  - by Shimmy

  The question is intended for lazy VB programmers. Please. In vb I can do and I won't get any errors. Example 1 Dim x As String = 5 Dim y As Integer = "5" Dim b As Boolean = "True" Example 2 Dim a As EnumType = 4 Dim v As Integer = EnumType.EnumValue Example 3 Private Sub ButtonClick(sender As Object, e As EventArgs) Dim btn As Button = sender End Sub Example 4 Private Sub ButtonClick(sender As Button, e As EventArgs) Dim data As Contact = sender.Tag End Sub If I surely know the expected runtime type, is this 'forbidden' to rely on the vb-language built-in casting? When can I rely? Thanks

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• Where to use Controller.HttpContext

  - by Ben

  Hi, In my base controller's constructor I am calling an extension method that checks for specific cookies on the client. Currently I am using System.Web.HttpContext.Current to get the current context. However, I am lead to believe that I should be using Controller.HttpContext since it is more testable and contains additional information about the request. However, Controller.HttpContext returns null on creation (believe this is by design) but also on Initialize and Execute methods (unless I use Routing.RequestContext.HttpContext?). So if I should be using Controller.HttpContext instead of HttpContext.Current, at what point is it available to me in a request? Thanks Ben

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• Identify in a unit test if Jetbrains IntelliJ IDEA 8 or 9 is running

  - by Ran Biron

  I need to know, in a context of a unit test, if Jetbrains IntelliJ idea is the test initiator and if it is, which version is running (or at least if it's "9" or earlier). I don't mind doing dirty tricks (reflection, filesystem, environment...) but I do need this to work "out-of-the-box" (without each developer having to setup something special). I've tried some reflection but couldn't find a unique identifier I could latch onto. Any idea? Oh - the language is Java.

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• SSAS: distribution of measures over percentage

  - by Alex

  Hi there, I am running a SSAS cube that stores facts of HTTP requests. The is a column "Time Taken" that stores the milliseconds a particular HTTP request took. Like... RequestID Time Taken -------------------------- 1 0 2 10 3 20 4 20 5 2000 I want to provide a report through Excel that shows the distribution of those timings by percentage of requests. A statement like "90% of all requests took less than 20millisecond". Analysis: 100% <2000 80% <20 60% <20 40% <10 20% <=0 I am pretty much lost what would be the right approach to design aggregations, calculations etc. to offer this analysis through Excel. Any ideas? Thanks, Alex

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• Conversion of bytes into a type without changing the application (ie storing the conversion method i

  - by geoaxis

  Is there a way to store a conversion strategy (for converting some bytes) into a database and then execute it on the run time. If one were to store a complete java file, you would need to compile it, store the class and some how inject into the already running system. I am not sure how this would be possible. But using some kind of dynamic language on JVM would be nice. I see an example of execution of groovy from within spring context here http://www.devx.com/tips/Tip/42789 but this is still static in nature as application context contains the reference to the implementation and cannot be changed by database. Perhaps with JavaConfig of context it is possible. I am exploring options now, specifically with Spring 3.0. Your suggestions in any direction would be welcome.

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• JavaScript and CSS files for ASP.NET MVC 2 EditorTemplate user controls

  - by Zack Peterson

  I'm using an EditorTemplate DateTime.ascx in my ASP.NET MVC 2 project. <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<DateTime>" %> <%: Html.TextBox(String.Empty, Model.ToString("M/dd/yyyy h:mm tt")) %> <script type="text/javascript"> $(function () { $('#<%: ViewData.TemplateInfo.GetFullHtmlFieldId(String.Empty) %>').AnyTime_picker({ format: "%c/%d/%Y %l:%i %p" }); }); </script> This uses the Any+Time™ JavaScript library for jQuery by Andrew M. Andrews III. I've added those library files (anytimec.js and anytimec.css) to the <head> section of my master page. Rather than include these JavaScript and Cascading Style Sheet files on every page of my web site, how can I instead include the .js and .css files only on pages that need them--pages that edit a DateTime type value?

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• Delphi connection to OpenEdge Progress-4GL Database

  - by Cesar Marrero

  Folks: Has anyone had success connecting to a Progress-4GL database with Delphi?   I've been unable to establish any connection with the ODBC driver provided by the vendor (Progress OpenEdge 10.1C Driver). I've entered (what I believe are) the right parameters, but keep on getting an error whenever I test the connection: "[DataDirect][ODBC Progress OpenEdge Wire Protocol driver] Socket closed." Background: I've been tasked to re-design a 13-year-old application, but the original programmer did not provide any supporting documents, passwords, configuration setup, etc. (I'm on my own)!   To make things worse, online help and useful documentation about Progress is scarce (I had never heard about this database until now). I want to examine the existing data, maybe create an ERD to familiarize myself with the schema, but I can't even access the data outside of the OpenEdge code. Any help is appreciated!

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• MySQL Interview Questions

  - by Campbell

  Hi, I've been asked to screen some candidates for a MySQL DBA / Developer position for a role that requires an enterprise level skill set. I myself am a SQL Server person so I know what I would be looking for from that point of view with regards to scalability / design etc but is there anything specific I should be asking with regards to MySQL? I would ideally like to ask them about enterprise level features of MySQL that they would typically only use when working on a big database. Need to separate out the enterprise developers from the home / small website kind of guys. Thanks.

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• custom events in child userControls c# .net or Child to Parent Communication in UserControls

  - by Asad Malik

  Okay here is the scenario: I have a parent "SalesUC" UserControl which contains a "itemDetailsUC" UserControl, as well as a status label. (plz see sample below) What I want: If there occurs any exception in itemDetailsUC, it should be able to communicate the exception text to parent control (i.e. SalesUC). Remember: the "ItemDetailsUC" is also used in other controls that may or may not have status label. any suggestions, answers... please. Framework: .net 3.0/3.5 Language: c# Domain: Windows Application, WinForms, etc. Sample ScreenShot regards.

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• 10 lines of code per day is the global average!? -- true?

  - by Earlz

  Ok so last year I participated in a high school curriculum contest thing at a college(I currently attend this college). I actually got 1st in it but was still a bit angry I didn't get every single one right. The most baffling of questions on there was How many lines of code does the average programmer write per day? A. 5 B. 10 C. 25 D. 30 Aside from being a subjective question which depended on language and everything else I was more baffled at what they had as the correct answer. 10. Even on my bad days at my job I touch more than 10 lines of code(either adding, modifying, or deleting) per day. And when I took this test I had only programmed as a hobby where it was common for me to write a few hundred lines for one of my new projects per day. Where are they getting this random number of ten!? Is this published somewhere? A quick googling found me nothing.

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• Text mining with PHP

  - by garyc40

  Hi, I'm doing a project for a college class I'm taking. I'm using PHP to build a simple web app that classify tweets as "positive" (or happy) and "negative" (or sad) based on a set of dictionaries. The algorithm I'm thinking of right now is Naive Bayes classifier or decision tree. However, I can't find any PHP library that helps me do some serious language processing. Python has NLTK (http://www.nltk.org). Is there anything like that for PHP? I'm planning to use WEKA as the back end of the web app (by calling Weka in command line from within PHP), but it doesn't seem that efficient. Do you have any idea what I should use for this project? Or should I just switch to Python? Thanks

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• Using MS ReportViewer in WPF

  - by Mitch

  I'm about to start using the MS ReportViewer in a WPF application by placing the ReportViewer in a WindowsFormsHost. Is this the correct approach? What is the best way of designing the reports as you cannot use the ReportViewer at design time in a WindowsFormsHost. Is it best to create an RDL report in SQL Server and then convert it to an RDLC or maybe to create a new Winforms app to create an RDLC file in a WinForms framework and then copy it to the WPF app. I will need to filter the reports via dropdowns so there's that aspect to consider too. If anyone out there is already using ReportViewer in WPF I would appreciate some feedback on the best approach.....Many thanks.

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• Are you as productive in Javascript as you are in .Net or Java?

  - by bglenn

  I code primarily in javascript and in vb.net. I've found that if I can achieve the same thing in both javascript and vb.net that I feel far more productive and expressive using javascript for the task. I often find myself researching server-side javascript implementations to see if anything has gone mainstream so that I can code my back-end business logic and data access in javascript. Given all the advanced tooling and language features in .Net this preference seems somewhat paradoxical to me. I'm not suggesting one is better than the other (I've been a vb programmer since I started programming), I'm just wondering if my preference is entirely subjective or if anyone else shares it. So, does anyone else enjoy coding in javascript to the point where you prefer it to the .Net and Java environment, and if, so why?

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• C# where does the dbml file come from?

  - by 5YrsLaterDBA

  Learning C# and learing Linq now. have lots of qestions about it. Basically I need a step by step tutorial. I suppose the dbml file is the configuration file of the database. I double click it and VS will open it with kind of design diagram. I can create/delete/modify table here? I can use add new item to add the Linq to SQL Classes to get a dbml file? what's next? generate tables in database? generate sql script? generate cs files? when? how?

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• WPF: IEditableCollectionView and CanAddNew and empty collections

  - by Aran Mulholland

  We were having some issues with the wpf datagrid and IEditableCollectionView (although this question applies to using IEditableCollectionView and ItemsControl) When you have a collection with no items in it, the IEditableCollectionView cannot determine what items should be inserted so it sets CanAddNew=false we found a solution here (buried deep in the comments) that goes like so : If you derive from ObservableCollection like this public class PersonsList : ObservableCollection<Person> { } you will find out that if the initial collection is empty, there won't be a NewItemPlaceHolder showing up on the view. That's because PersonsList cannot resolve type T at design time. A workaround that works for me is to pass type T as a parameter into the class like this PersonsList<T> : ObservableCollection<T> where T : Person { } This approach will place the NewItemPlaceHolder even if the collection is empty. I'm wondering if there is an interface i can implement on my collections that inform the IEditableCollectionView which type to create should i get an AddNew request.

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• User management API

  - by Akshey

  Hi, I am developing an application suite where users will need to connect to a server and depending on their account type they will be given some services. The server will run Linux. Can you please suggest me some user management API which I can use to develop the server program? By user management I mean user authentication and other related functionalities. I prefer to work in C++ or python, but any other language should not be a problem. Please note that this application suite is not web based. Due to security issues, I do not want to give each user a separate account on the linux server. Thanks, Akshey

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• How to convert an object into a double?

  - by george t.

  I am working on VS C# on the following code, which converts an user input math expression and computes it. MSScriptControl.ScriptControl sc = new MSScriptControl.ScriptControl(); sc.Language = "VBScript"; sc.ExecuteStatement( "function pi\n" + "pi = 3.14159265\n" + "end function"); sc.ExecuteStatement( "function e\n" + "e = exp(1)\n" + "end function"); expression = textBox1.Text.ToString(); expression = expression.Replace("x", i.ToString()); object y = sc.Eval(expression); string k = y.ToString(); double result = double.Parse(k); While this outputs onto the console with the correct result, I want to use the values to make a graph of the function user inputs and it's not doing it correctly. Thank you for your help.

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• Is learning the Caché database hard coming from relational databases and object oriented programming

  - by Edelcom

  I am currently running the local version of Caché on my system in order to determine if I can (and will) take on a new possible project. The current project uses Delphi 7 as a front end calling a Caché dll where the business logic is stored in the database. I have a background of Sqlserver and Firebird (and before Access and Paradox) as databases. I use Delphi 7 for 95% of my Windows development, so I know about object programming. I would like to recieve opinions from persons having used Caché and either SqlServer, Firebird or Oracle and having developed in Delphi (or C++ or C# - an object oriented language). I have read the pro's and con's from other questions, but I am not asking for this, I need input from Caché developers. Thanks in advance.

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• Reference from UITableViewCell to UITableView to UINavigationController

  - by Nick

  If the user taps and holds on a Foo table view cell for 2 seconds, a modal view should be shown. The modal view is also displayed when a new Foo is added to the cell. The modal view's delegate protocol is implemented by the parent UITableView subclass. My tap and hold detection code is in the Foo UITableViewCell class. I'm having difficulty referencing the parent tableview's navigation controller to display the modal view. FooModalViewController *modalController = [[FooModalViewController alloc] initWithNibName:@"FooModalViewController" bundle:nil]; FooTableViewController *tableView = (FooTableViewController *) self.superview; foo.delegate = tableView; Seems OK but I'm having problems referencing the navigation controller that contains the tableview.. The code below builds OK but throws an exception - NSOBject DoesNotRecognizeSelector. UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:modalController]; [[tableView.navigationController] presentModalViewController:navigationController animated:YES]; I think that perhaps my design is flawed..?

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• Cross-site json rpc : Python server side and Mozilla extension using Javascript client side

  - by jknair

  hello, I am building a mozilla extension that contacts a python application on a remote server to send and receive data. The python application can be used using xml-rpc from a python console.I am given the task to design a json-rpc that would contact the same application.Making the python server side has been easy which can be accesed using python console but making the mozilla extension to connect to the python serverside is what i am not understanding howto ??? how do i make cross site json rpc calls i have gone through a lot of libraries that i can find on googling but none of them seem to work i am not sure if it is because of same origin policy or my server side not able to process the data ??? ANY HELP

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• NLP - Word Alignment

  - by mgj

  Hi..:) I am looking for word alignment tools and algorithms, I am dealing with bilingual English - Hindi text, Currently I am working on DTW(Dynamic Time Warping) algorithm, CLA(Competitive Linking Algorithm) , NATool, Giza++. Could you please suggest me any other alogrithm/tool which is language independent which could achieve Statistical word alignment for parallel English Hindi Corpora and its Evaluation, some tools languages are best for certain languages.. Could one please tell me how true is that and if so could you please give me an example what would suite better for Asian languages like Hindi and what shouldn't I use for such languages. I have heard a bit about uplug word aligner.. could one tell me if I could use it as a tool for my purpose. Thank you.. :)

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• IPhone Example : Login Page and then Navigate to another Screen (UI Table View)

  - by Smc

  Hi, I am an .Net Expert but a new to the IPhone App Development. Recently I have started workinf on Objective - c. I need a help I need a example which shows a Login Screen and then Navigates to the another Screen (UITableView) when username and password and found correct. As of now I am assuming that username and passwords are hardcoded in app. I have tried to Design the Screen for Login UI but unable to Load the another ViewController but it wont worked Can some one help me out with examples, Links?

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• What is the "standard" JQuery treeview that most people use? It seems the most popular plugin isn't

  - by Pete Alvin

  I've chosen JQuery as my JavaScript library but now I'm a bit frustrated by the JQuery plugin site... the site kinda sucks... the plugin area isn't designed very well and I can only find a few treeviews. The one with the most votes (link text) isn't supported anymore. Can someone please point me to an industrial strength treeview? Desired Features: 1. stable 2. async / ajax would be nice 3. drag and drop nodes would be nice I've been delighted so far with JQueryUI--nice design. But, how come it doesn't come with a standard tree view? Pete

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