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  • Calculate the digital root of a number

    - by Gregory Higley
    A digital root, according to Wikipedia, is "the number obtained by adding all the digits, then adding the digits of that number, and then continuing until a single-digit number is reached." For instance, the digital root of 99 is 9, because 9 + 9 = 18 and 1 + 8 = 9. My Haskell solution -- and I'm no expert -- is as follows. digitalRoot n | n < 10 = n | otherwise = digitalRoot . sum . map (\c -> read [c]) . show $ n As a language junky, I'm interested in seeing solutions in as many languages as possible, both to learn about those languages and possibly to learn new ways of using languages I already know. (And I know at least a bit of quite a few.) I'm particularly interested in the tightest, most elegant solutions in Haskell and REBOL, my two principal "hobby" languages, but any ol' language will do. (I pay the bills with unrelated projects in Objective C and C#.) Here's my (verbose) REBOL solution: digital-root: func [n [integer!] /local added expanded] [ either n < 10 [ n ][ expanded: copy [] foreach c to-string n [ append expanded to-integer to-string c ] added: 0 foreach e expanded [ added: added + e ] digital-root added ] ] EDIT: As some have pointed out either directly or indirectly, there's a quick one-line expression that can calculate this. You can find it in several of the answers below and in the linked Wikipedia page. (I've awarded Varun the answer, as the first to point it out.) Wish I'd known about that before, but we can still bend our brains with this question by avoiding solutions that involve that expression, if you're so inclined. If not, Crackoverflow has no shortage of questions to answer. :)

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  • How can I get the source code for ASTassistant?

    - by cyclotis04
    I'm trying to develop an application similar to ASTassistant, and in the article the author says that he included "the source code with the binaries." After downloading the ZIP folder, however, I've found no source. The program is written in REAL Basic, which I don't know anything about. Do I need to purchase REAL Basic to view ASTassistant's source code, or is it somewhere I haven't looked? Thanks

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  • How should I begin to help projects in Github?

    - by Erik Escobedo
    I'm new to github and I like to help other people with his projects that I find interesting. I know there's a lot of guides in the github place, but I think it could be nice to gather a bunch of real people's experiences. So, I invite you to post about your first experiences in github. Whether you are a not-so-newbie or you are a heavy rock in github comunnity, I think your lines could encourage real newbies like me about entering this great open source community.

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  • wx.NotificationMessage AttributeError: 'module' object has no attribute 'NotificationMessage'

    - by HughGrigg
    I get this error when trying to use wxPython's NotificationMessage class: wx.NotificationMessage("", "Hello world!").Show() AttributeError: 'module' object has no attribute 'NotificationMessage' The code is quite simply: #!/usr/bin/python import wx app = wx.App() wx.NotificationMessage("", "Hello world!").Show() app.MainLoop() What am I missing? This is running on Linux Mint 13, MATE 1.2 desktop environment, Python 2.7.3.

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  • Using IOperationBehavior to supply a WCF parameter

    - by Chris Kemp
    This is my first step into the world of stackoverflow, so apologies if I cock anything up. I'm trying to create a WCF Operation which has a parameter that is not exposed to the outside world, but is instead automatically passed into the function. So the world sees this: int Add(int a, int b) But it is implemented as: int Add(object context, int a, int b) Then, the context gets supplied by the system at run-time. The example I'm working with is completely artificial, but mimics something that I'm looking into in a real-world scenario. I'm able to get close, but not quite the whole way there. First off, I created a simple method and wrote an application to confirm it works. It does. It returns a + b and writes the context as a string to my debug. Yay. [OperationContract] int Add(object context, int a, int b); I then wrote the following code: public class SupplyContextAttribute : Attribute, IOperationBehavior { public void Validate(OperationDescription operationDescription) { if (!operationDescription.Messages.Any(m => m.Body.Parts.First().Name == "context")) throw new FaultException("Parameter 'context' is missing."); } public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation) { dispatchOperation.Invoker = new SupplyContextInvoker(dispatchOperation.Invoker); } public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation) { } public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters) { // Remove the 'context' parameter from the inbound message operationDescription.Messages[0].Body.Parts.RemoveAt(0); } } public class SupplyContextInvoker : IOperationInvoker { readonly IOperationInvoker _invoker; public SupplyContextInvoker(IOperationInvoker invoker) { _invoker = invoker; } public object[] AllocateInputs() { return _invoker.AllocateInputs().Skip(1).ToArray(); } private object[] IntroduceContext(object[] inputs) { return new[] { "MyContext" }.Concat(inputs).ToArray(); } public object Invoke(object instance, object[] inputs, out object[] outputs) { return _invoker.Invoke(instance, IntroduceContext(inputs), out outputs); } public IAsyncResult InvokeBegin(object instance, object[] inputs, AsyncCallback callback, object state) { return _invoker.InvokeBegin(instance, IntroduceContext(inputs), callback, state); } public object InvokeEnd(object instance, out object[] outputs, IAsyncResult result) { return _invoker.InvokeEnd(instance, out outputs, result); } public bool IsSynchronous { get { return _invoker.IsSynchronous; } } } And my WCF operation now looks like this: [OperationContract, SupplyContext] int Amend(object context, int a, int b); My updated references no longer show the 'context' parameter, which is exactly what I want. The trouble is that whenver I run the code, it gets past the AllocateInputs and then throws an Index was outside the bounds of the Array. error somewhere in the WCF guts. I've tried other things, and I find that I can successfully change the type of the parameter and rename it and have my code work. But the moment I remove the parameter it falls over. Can anyone give me some idea of how to get this to work (or if it can be done at all).

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  • What was the single byte change to port WordStar from CP/M to DOS?

    - by amarillion
    I was re-reading Joel's Strategy Letter II: Chicken and Egg problems and came across this fun quote: In fact, WordStar was ported to DOS by changing one single byte in the code. (Real Programmers can tell you what that byte was, I've long since forgotten). I couldn't find any other references to this with a quick Google search. Is this true or just a figure of speech? In the interest of my quest to become a "Real Programmer", what was the single byte change?

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  • Setting up a "to-many" relationship value dependency for a transient Core Data attribute

    - by Greg Combs
    I've got a relatively complicated Core Data relationship structure and I'm trying to figure out how to set up value dependencies (or observations) across various to-many relationships. Let me start out with some basic info. I've got a classroom with students, assignments, and grades (students X assignments). For simplicity's sake, we don't really have to focus much on the assignments yet. StudentObj <--->> ScoreObj <<---> AssignmentObj Each ScoreObj has a to-one relation with the StudentObj and the AssignmentObj. ScoreObj has real attributes for the numerical grade, the turnInDate, and notes. AssignmentObj.scores is the set of Score objects for that assignment (N = all students). AssignmentObj has real attributes for name, dueDate, curveFunction, gradeWeight, and maxPoints. StudentObj.scores is the set of Score objects for that student (N = all assignments). StudentObj also has real attributes like name, studentID, email, etc. StudentObj has a transient (calculated, not stored) attribute called gradeTotal. This last item, gradeTotal, is the real pickle. it calculates the student's overall semester grade using the scores (ScoreObj) from all their assignments, their associated assignment gradeWeights, curves, and maxPoints, and various other things. This gradeTotal value is displayed in a table column, along with all the students and their individual assignment grades. Determining the value of gradeTotal is a relatively expensive operation, particularly with a large class, therefore I want to run it only when necessary. For simplicity's sake, I'm not storing that gradeTotal value in the core data model. I don't mind caching it somewhere, but I'm having a bitch of a time determining where and how to best update that cache. I need to run that calculation for each student whenever any value changes that affects their gradeTotal. If this were a simple to-one relationship, I know I could use something like keyPathsForValuesAffectingGradeTotal ... but it's more like a many-to-one-to-many relationship. Does anyone know of an elegant (and KVC correct) solution? I guess I could tear through all those score and assignment objects and tell them to register their students as observers. But this seems like a blunt force approach.

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  • javascript function document.location working incorrectly

    - by john
    When I change on proxy-server page from cnn.com (I add javascript, that call document.location), result of the document.location is some url of advertisement: http://ads.cnn.com/html.ng/site=cnn_international&cnn_intl_pagetype=mmst&cnn_intl_position=336x850_rgt&cnn_intl_rollup=asia&page.allowcompete=yes&params.styles=fs&tile=5656033441721&domId=894131 and not current url:http://edition.cnn.com/2010/WORLD/asiapcf/04/13/soccer.world.cup.pakistan/index.html?hpt=C1 Do you know, where can be problem?

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  • how do you create a simple obejctice-c command line project in xcode

    - by Mark
    im moving from a c# VS2008 world into the mac world and I just wanted to know how I can create a quick little command line based application so that I can write many little objective-c apps without worrying about creating an iPhone app or whatever. Which projects do I create in xcode? I can see the Command Line Tool under "Mac os x" but the only options for the type is "C", "C++", "Core Data", "Core Foundation", "Core Services" and "Foundation" but no simple objective c project? Thanks

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  • How can I manually interpolate string escapes in a Perl string?

    - by Ryan Thompson
    In perl suppose I have a string like 'hello\tworld\n', and what I want is: 'hello world ' That is, "hello", then a literal tab character, then "world", then a literal newline. Or equivalently, "hello\tworld\n" (note the double quotes). In other words, is there a function for taking a string with escape sequences and returning an equivalent string with all the escape sequences interpolated?

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  • wsgi-served page does not refresh

    - by Steve
    I recently got my first app to work in uWSGI with Cherokee. I used the following code taken from the uWSGI docs: def application(environ, start_response): start_response('200 OK', [('Content-Type', 'text/plain')]) yield 'Hello World\n' The page correctly reads Hello World. When I change that text to New Thing and refresh, nothing changes. What am I forgetting? What I've tried: clearing browser history and cache stopping and starting Cherokee

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  • vi script problem on autocmd

    - by schemacs
    I want to create a template for all my python scripts using this autocmd bufnewfile *.py so ~/.vim/templates/python_skeleton.txt the content of python_sekleton.txt is as simple as this: #!/usr/bin/python # -*- coding: utf-8 -*- print 'Hello World' but vi give error message when i start to edit a new python script: line 2: E488: Trailing characters: # -*- coding: utf-8 -*- line 4: E488: Trailing characters: print 'Hello World' it seems '#' is not escaped,and anyone can work it out?thanks i advance

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  • Using a Cyc Image in Windows

    - by nrhine1
    Hi, I am trying to use a Microtheory for a research project I am working on, and am having trouble getting my saved Image of constants I create to work correctly. I save the image after creating the constants using (write-image "world\MyImage") and then going to the \server\run\ directory and using run-cyc-32bit.bat -w "world\MyImage" It loads the server correctly, but not with my constants. I found the above command at the reference page here. Thank you for any help

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  • How to construct a string based on regex and related parameters in PHP?

    - by user198729
    (?P<id>\d*)(/(?P<title>.*))? Most of the time,we use regex to match something,but how to generate the matching string if we have id and title already? Example,if id=4 and title='hello world',the result should be: 4/hello world But if we only have id=4,it should be: 4 Because as the regex indicates,title is optional. Two answers both misunderstood... There is no preg_match yet

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  • Production debugging: Is there a less intrusive way than WinDbg?

    - by Alex
    Hi, I was wondering if there is a less intrusive way to analyze a running, managed process in production environments. Less intrusive meaning: No delay of execution when attaching the debugger. No delay of execution when getting basic stats like running threads. In the Java world there is a such a tool part of the JDK. I was wondering if there're similar tools in the .NET world. Any ideas? Alex

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  • HttpService Vs Remote Objects

    - by kalyaniRavi
    Hi, I have a flex application and need to show the real time data into the chatrs and datagrids. Eralier we are used Httpservices to showing the real time data and historical data into charts and datagrids. But now we are going to replace the Httpservices to remote objects. So which places generally need to change. I have a little bit idea about remote objects. Thanks, Ravi

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  • unix shell, redirect output but keep on stdin

    - by Mike
    I'd like to have a shell script redirect stdout of a child process in the following manner Redirect stdout to a file Display the output of the process in real time I know I could do something like #!/bin/sh ./child > file cat file But that would not display stdout in real time. For instance, if the child was #!/bin/sh echo 1 sleep 1 echo 2 The user would see "1" and "2" printed at the same time

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