Search Results

Search found 6258 results on 251 pages for 'trouble'.

Page 120/251 | < Previous Page | 116 117 118 119 120 121 122 123 124 125 126 127  | Next Page >

• 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!

  Read the article

• How do I delete a foreign key in SQLAlchemy?

  - by Travis

  I'm using SQLAlchemy Migrate to keep track of database changes and I'm running into an issue with removing a foreign key. I have two tables, t_new is a new table, and t_exists is an existing table. I need to add t_new, then add a foreign key to t_exists. Then I need to be able to reverse the operation (which is where I'm having trouble). t_new = sa.Table("new", meta.metadata, sa.Column("new_id", sa.types.Integer, primary_key=True) ) t_exists = sa.Table("exists", meta.metadata, sa.Column("exists_id", sa.types.Integer, primary_key=True), sa.Column( "new_id", sa.types.Integer, sa.ForeignKey("new.new_id", onupdate="CASCADE", ondelete="CASCADE"), nullable=False ) ) This works fine: t_new.create() t_exists.c.new_id.create() But this does not: t_exists.c.new_id.drop() t_new.drop() Trying to drop the foreign key column gives an error: 1025, "Error on rename of '.\my_db_name\#sql-1b0_2e6' to '.\my_db_name\exists' (errno: 150)" If I do this with raw SQL, i can remove the foreign key manually then remove the column, but I haven't been able to figure out how to remove the foreign key with SQLAlchemy? How can I remove the foreign key, and then the column?

  Read the article

• Learning OOP Design

  - by waiwai933

  I've read Head First Java, and I understand how OOP works. Here's my problem: I'm a PHP programmer, and while I've used OOP in PHP, I'm having trouble figuring out what should be an object and what methods to give it. For example, let's say I have a app that allows people to log in and edit a document. Why should the document be an object if there will ever only be one instance? Should I give the deleteDocument() method to the document object or the admin object? The document is the one being deleted, but the admin is the one performing the action. So my real question is, coming from a procedural background, how do I figure out what should be objects and what should have what methods?

  Read the article

• Archlinux auto-start after I shutdown my computer

  - by madper

  every one. I'm in a big trouble. My computer (HP ProBook 4230s) has two OS----Archlinux and Win 7. When I use Archlinux, after halt my computer, it will start up after a while without press power. And there is an other thing. My computer's clock will be wrong. Many times I change it in bios, but it wrong again. If I turn off the computer from Win 7, it will never start up untill pressing power bottom. And the clock will be right. I also used ubuntu\debian\mageia, and both of them are fine with my notebook. Is there some configure is wrong with my ArchLinux?

  Read the article

• PPP connection with RAS dialer in C++

  - by user312054

  I have a windows mobile application that is using Windows CE 5.0. I have been informed by the people supplying the hardware for the unit that I need to create a socket, which I have done successfully, and then dial out to the internet with a PPP connection with a RAS dialer connection. Our old code uses an APN to dial out so I need to create the above connection with an APN. I am having trouble finding examples of this. Can someone point me to some examples of this situation?

  Read the article

• Java: matching two different type of array

  - by sling

  Hi, I am doing a password login that requires me to match two array: User and Pass. If user key in "mark" and "pass", it should show successfully. However I have trouble with the String[] input = pass.getPassword(); and the matching of the two arrays. String[] User = {"mark", "susan", "bobo"}; String[] Pass = {"pass", "word", "password"}; String[] input = pass.getPassword(); if(Pass.length == input.length && user.getText().equals(User)) { lblstat.setForeground(Color.GREEN); lblstat.setText("Successful"); } else { lblstat.setForeground(Color.RED); lblstat.setText("Failed"); }

  Read the article

• 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?

  Read the article

• HTTP Builder/Groovy - get source text _and_ XmlSlurper output?

  - by Misha Koshelev

  Dear All: I am reading here: http://groovy.codehaus.org/modules/http-builder/doc/get.html I seem to be able to get i) XMLSlurper output as parsed by NekoHTML using: def http = new HTTPBuilder('http://www.google.com') def html = http.get( path : '/search', query : [q:'Groovy'] ) ii) Raw text using: http.get( path : '/search', contentType : TEXT, query : [q:'Groovy'] ) { resp, reader -> println "response status: ${resp.statusLine}" println 'Headers: -----------' resp.headers.each { h -> println " ${h.name} : ${h.value}" } println 'Response data: -----' System.out << reader println '\n--------------------' } I am having some trouble and would like to get BOTH (i) and (ii) to debug my XmlSlurper code on the actual html I am getting. Any suggestions how I might go about doing this? I can easily instantiate an XmlSlurper object with the relevant string using the parseString(string) method or the parse(reader) method, but I cannot seem to get the Neko processing step correct. Any hints? Thank you! Misha

  Read the article

• SVNKit's SVNCpoyClient method not working properly

  - by Gabriel Parenza

  Hi Everyone, I am having trouble copying file using SVNKit. After copying the files from source to destination files end up one folder above the intended folder. For ex: When copying files from "https://example.com/svn/repos/trunk/project/src/ex.txt" to "https://example.com/svn/repos/branches/PackageN/project/src", files end up in "project" folder inside PackageN while my intention is to move it to "src" folder inside "project. Code I am using: svnCopySource svnCopySource[] = new SVNCopySource[]{}; SVNCommitInfo svnCommitInfo = SVNClientManager.newInstance(null,"", "").getCopyClient().doCopy(svnCopySource, dstURL, false, false, false,commitMessage, null); // SVNCopySource[] sources // SVNURL dst // boolean isMove // boolean makeParents // boolean failWhenDstExists, // String commitMessage, // SVNProperties revisionProperties

  Read the article

• Eclipse does not recognize Classes of the jar

  - by Tom Brito

  I've included a new jar in my jre/lib/ext folder, and updated the Eclipse jre so the Eclipse see the new jar in the default JRE System Library. The trouble is that even showing the jar in the JRE System Library, the Eclipse does not see the Classes. And the worst: Eclipse see tha packages! It don't see only the classes! Here is a printscreen showing the jar withing the JRE System Library, and the Eclipse preview showing only the packages: http://picasaweb.google.com/brito.pro/Fail#5458323206632279634 Any idea how to solve this? :?

  Read the article

• Setting the Hostname in IIS Bindings Breaks Website

  - by Josh

  I just got a Windows Server 2008 VPS and I'm having trouble getting IIS7 setup. I created a new website in IIS with the path, ip address, and hostname (like 'www.nameofsite.com') and click OK. When I browse to the site it pulls up "http://www.nameofsite.com" in the browser and... nothing... IE cannot display this webpage. If I blank out the hostname in the bindings and click [Browse] it works fine (it takes me to http://10.10.2.92 - the computer's ip). So entering the hostname breaks the website. Any ideas on what I'm missing? Services I might not have running or roles I'm missing? No server roles were initially installed on the VPS so I installed IIS, DHCP, DNS, and Application Server... overkill, but I wasn't sure what to install.

  Read the article

• Converting "is null" into a linq to sql statement

  - by Darryl Braaten

  I am having trouble replicating the following sql as a LINQ statement select TableA.* from TableA left outer join TableAinTableB on TableA.Id = TableAId where TableBId is null The following returns no lines from TableA in db.TableA join AinB in db.TableAinTableB on TableA.Id equals TableAId where AinB.TableBId == null select TableA Also tried and a few other things that didn't work. from TableA in db.TableA join AinB in db.TableAinTableB on TableA.Id equals TableAId where AinB == null select TableA TableAinTableB is a many to many table. The query I want will pull all the records from TableA that have no records in the middle table. My sql does what I want but I have no idea how to convert it to LINQ to SQL. I ended up working around it by just doing a db.ExecuteQuery("working sql"); But I would like to know if the query is possible in LINQ and how to write it, or a pointer to a document that covers this scenario. My searching did not uncover anything I found useful.

  Read the article

• Using OpenGL drawing operations in an object-oriented setting?

  - by Lion Kabob

  I've been plowing through basic shaders and whatnot for an application I'm writing, and I've been having trouble figuring out a high-level organization for the drawing calls. I'm thinking of having a singleton class which implements a number of basic drawing operations, taking data from "user" classes and passing that to the appropriate opengl calls. I'm wondering how people do this when writing their own applications, as the internet is chock full of basic "Your first shader" tutorials, but very little on suggested organization of drawing code. My particular environment is targeted at iPad/OpenGL ES 2.0, but I think the question stands for most environments.

  Read the article

• Subsonic custom mapping of objects to tables

  - by codekaizen

  Geeting, I'm using Compact Framework 3.5 and have tenatively settled on a custom build of Subsonic 3.0 to do data access. The trouble is that I am used to developing model-first but am also interested in keeping control of my DB schema. Therefore, neither ActiveRecord or Repository appears to meet my needs, and I want to use my existing POCO model and map it to my existing tables. I'm used to doing this via NHibernate and Entity Framework. After some investigation, it appears that I might be able to author a custom QueryMapping to give me the custom mapping I want. Before I start down this path, however, I'd like to see some kind of example of this being done. I can't seem to find any on the web, and wonder if anyone could give input on experience with Subsonic, model-first and a custom Table-per-Type and Table-per-Hierarchy mapping.

  Read the article

• C# to Java: where T : new() Syntax

  - by Shiftbit

  I am porting some C# code over to Java. I am having trouble with the where Syntax, specifically new(). I understand that where is similar to Java's generic: T extends FOO. How I can replicate the new() argument in Java? "The new() Constraint lets the compiler know that any type argument supplied must have an accessible parameterless--or default-- constructor." - MSDN ie: public class BAR<T> : BAR where T : FOO, new() Right now I have: public class BAR<T extends FOO> extends ABSTRACTBAR { public HXIT(T t){ this.value = t; } .... }

  Read the article

• combining two different htaccess methods into one

  - by Patrick

  Im having trouble getting this htaccess to work properly. This is my file as it stands RewriteEngine on RewriteBase / RewriteRule ^sam/$ animals.php [QSA] RewriteCond %{REQUEST_URI} !(\.gif)|(\.jpg)|(\.png)|(\.css)|(\.js)|(\.php)|(\.swf)|(\.xpi)|(\.ico)|(\.src)$ RewriteCond %{REQUEST_URI} ^(.*)$ RewriteRule (.*)$ get.php?code=$1 [L] When i use RewriteEngine on RewriteBase / RewriteRule ^sam/$ animals.php [QSA] or RewriteEngine on RewriteCond %{REQUEST_URI} !(\.gif)|(\.jpg)|(\.png)|(\.css)|(\.js)|(\.php)|(\.swf)|(\.xpi)|(\.ico)|(\.src)$ RewriteCond %{REQUEST_URI} ^(.*)$ RewriteRule (.*)$ get.php?code=$1 [L] independently, it works fine, but together neither work properly. Here is what im trying to do: Any requests sent to domain.com/sam/?whatever=dogs, will get sent to domain.com/animals.php?whatever=dogs Any requests sent as domain.com/whatever, will get sent to domain.com/get.php?code=whatever

  Read the article

• Mac OS X pygame input goes to Terminal instead of Python

  - by Parappa

  I'm having trouble running a pygame based app on Mac OS X via Terminal. Input events such as keystrokes go to the Terminal instead of my Python app, and are detected by pygame. For example, I have the following test script: import pygame pygame.init() screen = pygame.display.set_mode((640, 480)) done = False while not done: pygame.event.pump() keys = pygame.key.get_pressed() if keys[pygame.K_ESCAPE]: done = True if keys[pygame.K_SPACE]: print "got here" Neither K_ESCAPE nor K_SPACE will be handled by this script when I run it from a Mac OS X Terminal, but Terminal will echo back the spaces. I'm running the MacPorts port of pygame (py-game), which depends on Python 2.4, and I've also used python_select to make python24 the active version.

  Read the article

• rails accessing value from facebooker hash/array

  - by Ben

  This is my first time using the facebooker plugin with rails, and I'm having trouble accessing user info. The website uses FB connect to authenticate users. I am trying to get the name of the university that the logged in user attends. When I use the command <%= facebook_session.user.education_history[:name] %>, I get an error "Symbol as array index". I have also tried using education_history[1], but that just returns "# Facebooker::EducationInfo:<some sort of alphanumeric hash value>" When I use something like <%= facebook_session.user.relationship_status %> , it returns the relationship status just fine. Similarly, <%= facebook_session.user.hometown_location.city %> returns the city name just fine. I've checked out the documentation for facebooker, but I can't figure out the correct way to get the values I need. Any idea on how to get this to work? Thanks!

  Read the article

• Complicated jQuery .hover Work

  - by Paul Herz

  The following code is giving me a lot of trouble. To note, .hover changes the background image. Firstly, how can I combine the two with .hover rather than a separate mouseenter and mouseleave? Second, How can I make it so that while the div is shifting upwards, the background image is simultaneously fading? $('div.designbox.orangehello').mouseenter(function() { $('div.designbox.orangehello').animate({ top: '-=10', }, 55, function() { $(this).addClass('hover'); }); }); $('div.designbox.orangehello').mouseleave(function() { $('div.designbox.orangehello').animate({ top: '+=10', }, 55, function() { $(this).removeClass('hover'); }); });

  Read the article

• [Python] Detect destination of shortened, or "tiny" url

  - by conradlee

  I have just scraped a bunch of Google Buzz data, and I want to know which Buzz posts reference the same news articles. The problem is that many of the links in these posts have been modified by URL shorteners, so it could be the case that many distinct shortened URLs actually all point to the same news article. Given that I have millions of posts, what is the most efficient way (preferably in python) for me to detect whether a url is a shortened URL (from any of the many URL shortening services, or at least the largest) Find the "destination" of the shortened url, i.e., the long, original version of the shortened URL. Does anyone know if the URL shorteners impose strict request rate limits? If I keep this down to 100/second (all coming form the same IP address), do you think I'll run into trouble?

  Read the article

• Better type safety in Java collections

  - by Paul Tomblin

  In my java coding, I often end up with several Map<String,Map<String,foo>> or Map<String,List<String>> and then I have trouble remembering which String is which key. I comment the declaration with //Map<capabiltyId,Map<groupId,foo>> or //Map<groupId,List<capabilityId>, but it's not the greatest solution. If String wasn't final, I would make new classes CapabilityId extends String and GroupId extends String, but I can't. Is there a better way to keep track of which thing is the key and maybe have the compiler enforce it?

  Read the article

• Where and which data to save into session on an ASP.NET MVC 2 application?

  - by Shaharyar

  I am having some trouble saving the state of my current view. Currenly I have several selectlist calling their own Action method on the controller that returns the Index view with the filtered model based on the values of the selectlist. I have also written a little FileResult action that creates a csv file based on the current model. But I am only covering one selectlist right now as I only save the value of selectList1 into the session and access it with Session["SelectListValue1"] What are the best practices in this situation? Should I redo the entire (each action for each SelectList) part? Should I save each SelectLists value into the session and check if it's null? Or should I just save the Lambda Expression into the session and modify it during every call?

  Read the article

• How do I Call a method from other Class

  - by balexandre

  Hi guys, I'm having some trouble figuring out to call methods that I have in other classes #import "myNewClass.h" #import "MainViewController.h" @implementation MainViewController @synthesize txtUsername; @synthesize txtPassword; @synthesize lblUserMessage; - (IBAction)calculateSecret { NSString *usec = [self calculateSecretForUser:txtUsername.text withPassword:txtPassword.text]; [lblUserMessage setText:usec]; [usec release]; } ... myNewClass.h #import <Foundation/Foundation.h> @interface myNewClass : NSObject { } - (NSString*)CalculateSecretForUser:(NSString *)user withPassword:(NSString *)pwd; @end myNewClass.m #import "myNewClass.h" @implementation myNewClass - (NSString*)CalculateSecretForUser:(NSString *)user withPassword:(NSString *)pwd { NSString *a = [[NSString alloc] initWithFormat:@"%@ -> %@", user, pwd]; return a; } @end the method CalculateSecretForUser always says 'MainViewController' may not respond to '-calculateSecretForUser:withPassword:' what am I doing wrong here?

  Read the article

• iphone app crashing when url connection connection timed out is coming

  - by satyam

  I'm creating iphone app. In that, when the app starts, it connects to server and downloads few images and then proceeds with app. When app is downloading, it will show the initial splash screen. as long as my server is able to ping my iphone, its working well. but the trouble starts when my server is taking much time to respond for the NSURL request. The app is crashing with following error: Mon May 14 13:56:34 unknown Springboard[24] <Warning>: com.xxxx.xxx failed to launch in time I understood that when such issues happen with application, iphone crashes the appliation. I would like to know how much max time iphone allows app to respond to such instances. Is there any max value for that?

  Read the article

• List of programming related conferences, unConference and meet-ups in the UK?

  - by Daniel Vaughan

  I really enjoy attending unconference/BarCamp type events and getting to meet developers, designers etc. from different backgrounds and sharing ideas in person. However, I have trouble finding events as there does not seem to be one place where they are listed. Does anyone know of such a place? I also want to setup a Google Technology User Group in Bristol but again other that putting it on Linkedin, Facebook, Meetup.com etc. I don't really know how to get the information out to what would essentially be a niche group of developers. Any ideas?

  Read the article

< Previous Page | 116 117 118 119 120 121 122 123 124 125 126 127  | Next Page >