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• Why is this an invalid Turing machine?

  - by Danny King

  Whilst doing exam revision I am having trouble answering the following question from the book, "An Introduction to the Theory of Computation" by Sipser. Unfortunately there's no solution to this question in the book. Explain why the following is not a legitimate Turing machine. M = { The input is a polynomial p over variables x1, ..., xn Try all possible settings of x1, ..., xn to integer values Evaluate p on all of these settings If any of these settings evaluates to 0, accept; otherwise reject. } This is driving me crazy! I suspect it is because the set of integers is infinite? Does this somehow exceed the alphabet's allowable size? Thanks!

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• 8-direction path finding algorithm

  - by frinkz

  I'm having trouble finding the right pathfinding algorithm for some AI I'm working on. I have players on a pitch, moving around freely (not stuck to a grid), but they are confined to moving in 8 directions (N NE E etc.) I was working on using A*, and a graph for this. But I realised, every node on the graph is equally far apart, and all the edges have the same weight - since the pitch is rectangular. And the number of nodes is enormous (being a large pitch, with them able to move between 1 pixel and another) I figured there must be another algorithm, optimised for this sort of thing?

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• Eclipse takes ages to display breakpoint when running tomcat

  - by Ryan

  Hi, When tomcat hits a breakpoint in Eclipse, the execution thread stops, but the breakpoint takes absolutely ages to appear in Eclipse. The same is true if I try to inspect a variable; the first time takes about 2 minutes. After that, the debug session is fine. What with that and the CONSTANT need to keep re-publishing to tomcat every time I change something, it's driving me nuts. Does anybody have any ideas why it's so slow? Also, how can I stop tomcat restarting the webapp every time I try to change something during a debug session? I am sure it never used to do that... Eclipse is 3.3.1.1 with J2EE Standard Tools and Web Standard Tools. Tomcat is 5.5 Thanks a lot for any advice! Ryan

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• Recommendation needed for text content, should I use text files or database?

  - by Jörgen

  I'm doing a web application in asp.net mvc. Now I'm at the point where I do alot of text info such as help texts, eula, privacy policy etc. I realized that I'm not sure what would the best way to store these texts. 1. Directly in the aspx page 2. In text files and then load the text via ViewData[] to the aspx file 3. In my sql database If use option 3 how would I then design the database e.g. eula = table x, privacypolicy=table y? I guess I just need some directions of what't the pros and cons with the options above.

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• product suggestion based on user data

  - by Enkay

  I'm trying to add suggestions to product pages along the lines of : "Customers who purchased this item also purchased x and y". The way the data is compiled right now is a mysql table with 3 rows. PRODUCT | CUSTOMER |QUANTITY Product is the product ID. Customer is the customer ID. Quantity is the number of time that product was bought by that customer. For each product description page, the system needs to figure out which users bought that product, what other products those users bought, in what quantity and then return the 2 products that were bought the most by people who bought the current product. Hopefully this makes sense and someone can point me in the right directions as to what the mysql query should look like. Thanks.

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• Access Adobe InDesign files

  - by PeterMmm

  I need some directions for the following problem: I have a lot of InDesign files and i have to setup a process that will track if a certain paragraph or text block has changed between diferent versions of the file. If the text block has changed i want to extract that text block in a "portable" format (html, pdf, txt). Is there an Adobe product that would do that ? Is there any public API to access an InDesign file ? Is there the posibility to export InDesign to, say, html ?

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• Easy XPath question for iPhone

  - by Sam

  Hey guys! This is driving me NUTS! Here's my XML document <?xml version="1.0" encoding="UTF-8"?> <container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container"> <rootfiles> <rootfile full-path="content.opf" media-type="application/oebps-package+xml"/> </rootfiles> </container> All I want to do is get the root file element. I'm using TouchXML on the iPhone and here is my xPath query: /container/rootfiles/rootfile It doesn't work! I've tried everything. Any help would be appreciated... Sam

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• Self Assesstment Tests for Programmers

  - by THX1138.6

  I want to help the Dev team identify areas of knowledge (practical and theoretical) that they can work on. Though I am big believer in focusing on people's strengths being a good programmer requires (I think) being challenged by concepts and ideas that don't always come naturally. We work largely in the web app space using PHP & MySQL but better skills in data modelling, query optimisation, use of MVC and OOP etc. would help the team and the company a lot. I want to help the Dev team manage their careers, explore and expand their skills sets. Be all they can be and better than they were previously. I know its an idealistic goal but work must be about more than simply getting the work done. There should be some time to review, to learn, to grow and get better. Any thoughts, ideas, opinions and directions to tests or similar resources would be greatly appreciated.

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• Why has Javascript been (mostly) only a browser-side technology for more than 10 years?

  - by Gabriel Cuvillier

  Recently there is a lot of projects that pushes Javascript into other directions: as a general purpose scripting language (GLUEScript, Rhino), as an extension language (QTScript, Adobe Reader, OO Macros), Widgets (Yahoo Widgets, MS Gadgets, Dashboard), and even server-side JS & web frameworks (CommonJS, Helma, Phobos, V8cgi), which seems obvious since it is already a language widely used for web development. But wait, everything is so new and nothing is really mature. However JS is around for almost 15 years, being as powerfull as any other scripting languages, being standardised by the ECMA, and being a mandatory technology for web development. Why did it take so much time to gain acceptance into other domains than web browsers?

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• What are appropriate ways to represent relationships between people in a database table?

  - by Emilio

  I've got a table of people - an ID primary key and a name. In my application, people can have 0 or more real-world relationships with other people, so Jack might "work for" Jane and Tom might "replace" Tony and Bob might "be an employee of" Rob and Bob might also "be married to" Mary. What's the best way to represent this in the database? A many to many intersect table? A series of self joins? A relationship table with one row per relationship pair and type, where I insert records for the relationship in both directions?

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• Groovy 1.7 changes "final"?

  - by Aaron L. Carlow

  Just started learning Groovy, got the PragProg book "Programming Groovy" and had a problem compiling one of the sample scripts: class GCar2 { final miles = 0 def getMiles() { println "getMiles called" miles } def drive(dist) { if (dist > 0) { miles += dist } } } def car = new GCar2() println "Miles: $car.miles" println 'Driving' car.drive(10) println "Miles: $car.miles" try { print 'Can I see the miles? ' car.miles = 12 } catch (groovy.lang.ReadOnlyPropertyException ex) { println ex.message GroovyCar2.groovy: 20: cannnot access final field or property outside of constructor. @ line 20, column 35. def drive(dist) { if (dist > 0) miles += dist } ^ Groovy versions prior to 1.7 do not give an error. I looked through whatever documentation I could find and did not see the issue discussed. What is going on here? Aaron

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• DateTime from Javascript post to Controller in ASP.NET results in null (01/01/0001)

  - by Geoffrey

  This is driving me crazy, similar to this. If I use a standard form and no javascript the controller correctly binds the datetime. However when I'm posting from a form it always binds as null: "MyObject.Name": "Test name", "MyObject.Date": "5/1/2001" I've tried a couple of variations, 5-1-2001, etc. but cannot seem to get it to take. I can confirm that it is being passed to the server as it shows up in the Request.Form string. My culture is Gregorian and I've set: Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture; In Application_BeginRequest(). What gives?

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• Visual studio 2008 Professional Edition acting weird

  - by Andres

  I have a weird situation on a winform project. I have user control (with 600 lines of code around) with a datagridview. I change de ColumnHeaderStyle of the font and save it. After I save the file I close it and open again, the changes were not saved (although the asterisk is dissapeared), because the ColumnHeaderStyle is back to the former value. This is driving me crazy because I cannot change any visual thing in the Designer. Any clue? Thanks in advance.

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• NSScrollView jumping to bottom on scroll

  - by Nick Locking

  I have an NSScrollView containing an NSImageView, which resizes based on various factors. When it resizes I have generally changed the image, so I scroll the NSScrollView to the top. This works fine. However, when I start to scroll the NSScrollView again, it moves a few pixels and then (most of the time) jumps to the bottom of the scroll. After it jumps once, it works as normal until I move the scroller to the top again. This is driving me insane. All I'm really doing is this: [_imageView setImage: anNSImage]; NSRect frame; NSSize imageSize = [anNSImage] size]; frame.size = imageSize; frame.origin = NSZeroPoint; [_imageView setFrame: frame]; [[_mainScrollview contentView] scrollToPoint: NSMakePoint(0, [_imageView frame].size.height - [_mainScrollview frame].size.height)];

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• Current state of client-side XSLT

  - by Casey

  Last I heard, Blizzard was one of the few companies to put client-side XSLT into practice (2008). Is this still the case in 2011, or are more people now exploring this technique in production?  It seems that modern browsers (IE9, FF4, Chrome) and client processing power are primed to exploit this standard for tangible savings in server CPU power and bandwidth on large scale properties. Am I missing something? The negative aspects I'm aware of include * additional rendering time * additional assets required on uncached page load * additional layer of complexity * noticably less developer experience than server-side template techniques The benefits I perceive include * distributed template composition (offloaded on the client) * caching of common template fragments offloaded on the client * logical separation of document structure and data * well-documented web standard supported by all modern browsers Finally, although I know it's impossible to predict the future, I am curious to know opinions on whether or not client-side XSLT's day will come. With interest in HTML5 driving users to upgrade their browsers and developers to explore new techniques, I would say yes. How about you? Thanks in advance, Casey

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• Alternative to google map api, so that I can use it on a HTTPS/SSL encrypted website.

  - by Zeeshan Rang

  I have a question regarding map api. I was using the the google map api in my website before. But since I have encryption the site using HTTPS/SSL support, the google map api stopped working. I checked online, and realised that google has a Premier account only that would allow me to use HTTPS supported maps api and it cost $10,000 per year. I do not this kind of money with me. So, can you give any other alternative to have a map api on my website. Anything that could give me driving directions would be fine. Regards Zeeshan

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• Stop propagating deletes

  - by Mark

  Is it just me or is anyone else finding EF very difficult to use in a real app :( I'm using it as the data layer and have created custom business objects. I'm having difficulty converting the business objects back to EF objects and updating/adding/deleting from the database. Does anyone know a good, simple example of doing this? Actually the current problem that's driving me nuts is when I delete something EF tries to delete other related stuff as well. For example, if I delete an invoice it will also delete the associated customer! Seems odd. I can't figure out how to stop it doing this. // tried: invoiceEfData.CustomerReference = null; // also tried invoiceEfData.Customer = null; context.DeleteObject(invoiceEfData); context.SaveChanges(); // at this point I get a database error due to it attempting to delete the customer

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• telling java to accept self-signed ssl certificate

  - by Nikita Rybak

  It looks like a standard question, but I couldn't find clear directions anywhere. I have java code trying to connect server with probably self-signed (or expired) certificate. It gives something like this [HttpMethodDirector] I/O exception (javax.net.ssl.SSLHandshakeException) caught when processing request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target As I understand, I have to play around with keytool and tell java that it's ok to allow this connection. But all comments I've found assume I'm fully proficient with keytool, like "generate private key for server and import it into keystore". And I'm not. Is there anybody who could post detailed instructions? I'm running unix, so bash script would be best. Not sure if it's important, but code executed in jboss. Thanks a lot!

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• C# Windows Forms Print Dialog box click OK twice to respond

  - by sbartlett007

  I'm using Visual Studio 2008, .net Framework 3.5 for a Windows forms client-server app that I'm working on. There is a weird bug when I run the program and try to print. The print dialog box opens, but I have to click the OK button twice for it to work. After the second click it works fine, no errors. When I put a breakpoint on: if (result == DialogResult.OK) , the breakpoint doesn't trigger until the second click. Here is the code: private void tbPrint_Click(object sender, EventArgs e) { try { printDialog1.Document = pDoc; DialogResult result = printDialog1.ShowDialog(); if (result == DialogResult.OK) { pDoc.PrinterSettings.PrinterName = printDialog1.PrinterSettings.PrinterName; pDoc.Print(); } ... This is driving me crazy, and I can't see anything else that would interfere with it.

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• cannot output a json encoded dict containing accents (noob inside)

  - by user296546

  Hi all, here is a fairly simple example wich is driving me nuts since a couple of days. Considering the following script: # -*- coding: utf-8 -* from json import dumps as json_dumps machaine = u"une personne émérite" print(machaine) output = {} output[1] = machaine jsonoutput = json_dumps(output) print(jsonoutput) The result of this from cli: une personne émérite {"1": "une personne \u00e9m\u00e9rite"} I don't understand why their such a difference between the two strings. i have been trying all sorts of encode, decode etc but i can't seem to be able to find the right way to do it. Does anybody has an idea ? Thanks in advance. Matthieu

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• Formatting a barcode with hyphens in between - Assignment question

  - by capex

  Hi, The assignment at my first year uni computing course says my program should read a barcode number, and then display the same 13 digit barcode number separated by hyphens. For example, 9300675016902 should look like 930-067501-690-1. The restrictions say I can't use the following: No arrays No strings No functions. Any directions on this? (So far I have done this: part1 = barcode/10000000000; which gives me the first three digits, and this: part4 = barcode%10; which gives me the last digit. Thanks in advance!

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• ApplicationCommand.Paste happens twice

  - by Carlo

  Hi, well this is driving me crazy. We have a command like so: <CommandBinding Command="ApplicationCommands.Paste" CanExecute="HasClipboardData" Executed="OnPasteExecuted"/> And the code for OnPasteExecuted is this: private void OnPasteExecuted(object sender, ExecutedRoutedEventArgs e) { CurrentView.Paste(); e.Handled = true; } That code gets executed twice, and I have no idea why, we also have the other commands: Cut, Copy, Undo, Redo, those work just fine, the problem is only with Paste. Let me know if you have any idea of what could be going on. Thanks!

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• Tomcat blankpage for default error page

  - by praspa

  First off, I'm using Tomcat 5.5 and my .jsp's live in /webapps/foo/bar/*.jsp. I followed the directions here to set up a default 404 error page. In my TOMCAT_HOME/conf/web.xml I entered: <error-page> <error-code>404</error-code> <location>/error.html</location> </error-page> I dropped copies of a test error.html file into each of the dirs (I wasn't sure where /error.html was referring to): /webapps/ /webapps/foo/ /webapps/foo/bar/ Whenever I attempt to access a non-existent page in a browser at url's /foo/missingpage.html or /foo/bar/missingpage.html I'm redirected to my error page that exists in /foo/error.html. However, attempting to access a non-existent page in a browser at url /missingpage.html yields a blankpage. Or any permutation of /missingDir/missingfile.html will also yield a blank page. Any suggestions? Am I missing some extra configuration? Thanks PR

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• How to tell Eclipse 3.4 WTP to not restart tomcat on JSP save?

  - by Boden

  Whenever I save a JSP file in my WTP project, Eclipse restarts its Tomcat instance. This is sorta driving me nuts. I don't want to disable auto reload completely, I just don't want it to happen when I save a file that doesn't require a restart. I'm not sure how Eclipse WTP works in this regard. Could it be my project structure? The JSP files are in WEB-INF/jsp. (this SO question is similar to mine, but doesn't have a sufficient answer) EDIT: I want auto-reloading to happen, but not for file saves that do not require it. When I save a JSP there is no reason to have Tomcat restart. Thus what I'm looking for, if possible, is a smarter way for reloading to happen.

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• asp.net FileUpload control problem: access to directory is denied

  - by citrus

  Hi, Im trying to use the fileupload control. Im using Visual Web Developer Express on my desktop. My web application is working fine except I cant use the fileUpload control. I get the following error: ERROR: Access to the path (My_Directory) is denied I searched and it appears to be a permissions problem. So I attempted to add the user ASPNET and give appropriate permissions to the directory, however, I was unable to add user "ASPNET". User "ASPNET" was not found. So then I followed the following directions to add user ASPNET via Control Panel Administration Computer management. So now I was able to add user ASPNET to the directory and give appropriate permissions but I still got the above error. http://p2p.wrox.com/net-web-services/5918-creating-aspnet-user.html Any ideas on why I cant access the directory?

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