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• Most Efficient way to set Register to 1 or (-1)

  - by Bob

  I am taking an assembly course now, and the guy who checks our home assignments is a very pedantic old-school optimization freak. For example he deducts 10% if he sees: mov ax, 0 instead of: xor ax,ax even if it's only used once. I am not a complete beginner in assembly programing but I'm not an optimization expert, so I need your help in something (might be a very stupid question but I'll ask anyway): if I need to set a register value to 1 or (-1) is it better to use: mov ax, 1 or do something like: xor ax,ax inc ax I really need a good grade, so I'm trying to get it as optimized as possible. ( I need to optimize both time and code size)

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• crossing edges in the travelling salesman problem

  - by bob

  Does there exist a travelling salesman problem where the optimal solution has edges that cross?

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• How do I find the user that has both a cat and a dog?

  - by brad

  I want to do a search across 2 tables that have a many-to-one relationship, eg class User << ActiveRecord::Base has_many :pets end class Pet << ActiveRecord::Base belongs_to :users end Now let's say I have some data like so users id name 1 Bob 2 Joe 3 Brian pets id user_id animal 1 1 cat 2 1 dog 3 2 cat 4 3 dog What I want to do is create an active record query that will return a user that has both a cat and a dog (i.e. user 1 - Bob). My attempt at this so far is User.joins(:pets).where('pets.animal = ? AND pets.animal = ?','dog','cat') Now I understand why this doesn't work - it's looking for a pet that is both a dog and a cat so returns nothing. I don't know how to modify this to give me the answer I want however. Does anyone have any suggestions? This seems like it should be easy - it doesn't seem like an especially unusual situation.

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• How do I reset a tabcontoller with a drill down table view

  - by Bob

  Hi, I have a tabbar with one of the tabs containing a drilldown table. I am having problems once the user has finished using the drilldown table. If they change to another tab, then change back to the original tab, the original tab is still where I left it (at the bottom of the drill down showing the detail view) What I want is on moving to an alternative tab the old tab resets I have tried adding all sorts of stuff to -(void)viewDidDisappear and -(void)viewDidUnload with no success What do I need to do? Cheers

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• What is a good approach to preloading data?

  - by Bob Horn

  Are there best practices out there for loading data into a database, to be used with a new installation of an application? For example, for application foo to run, it needs some basic data before it can even be started. I've used a couple options in the past: TSQL for every row that needs to be preloaded: IF NOT EXISTS (SELECT * FROM Master.Site WHERE Name = @SiteName) INSERT INTO [Master].[Site] ([EnterpriseID], [Name], [LastModifiedTime], [LastModifiedUser]) VALUES (@EnterpriseId, @SiteName, GETDATE(), @LastModifiedUser) Another option is a spreadsheet. Each tab represents a table, and data is entered into the spreadsheet as we realize we need it. Then, a program can read this spreadsheet and populate the DB. There are complicating factors, including the relationships between tables. So, it's not as simple as loading tables by themselves. For example, if we create Security.Member rows, then we want to add those members to Security.Role, we need a way of maintaining that relationship. Another factor is that not all databases will be missing this data. Some locations will already have most of the data, and others (that may be new locations around the world), will start from scratch. Any ideas are appreciated.

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• Rails route hanging

  - by Bob

  I'm trying to get someone else's app up and running on my development laptop but I ran into a routing issue and I'm not sure how to debug it. For a particular controller/action, it just hangs and doesn't time out and there is no error message in the development log. Does anyone know how I can debug this? Thanks.

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• Timeout on Large mySQL Query

  - by Bob Stewart

  I have this query: $theQuery = mysql_query("SELECT phrase, date from wordList WHERE group='nouns'"); while($getWords=mysql_fetch_array($theQuery)) { echo "$getWords[phrase] created on $getWords[date]<br>"; } The data table "wordList" contains 75,000 records in the group "nouns" and every time I load the code I am returned an error. Help!

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• Filter some words

  - by bob

  I want to filter some reserved word on my title form. $adtitle = sanitize($_POST['title']); $ignore = array('sale','buy','rent'); if(in_array($adtitle, $ignore)) { $_SESSION['ignore_error'] = '<strong>'.$adtitle.'</strong> cannot be use as your title'; header('Location:/submit/'); exit; How to make something like this. If user type Car for sale the sale will detected as reserved keyword. Now my current code only detect single keyword only.

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• Objective C LValue required as unary '&' operand

  - by Bob

  Hello! In my code, I get this error when I try to get a pointer to my class property. (I wrote a small *.OBJ file translator in Python, discarding the normals) CODE: //line: line of text const char *str = [line UTF8String]; Point3D *p1, *p2, *p3; p1 = [Point3D makeX:0 Y:0 Z:0]; p2 = [Point3D makeX:0 Y:0 Z:0]; p3 = [Point3D makeX:0 Y:0 Z:0]; sscanf(str, "t %f,%f,%f %f,%f,%f %f,%f,%f",(&[p1 x]),&([p1 y]),&([p1 z]),&([p2 x]),&([p2 y]),&([p2 z]),&([p3 x]),&([p3 y]),&([p3 z])); Triangle3D *tri = [Triangle3D make:p1 p2:p2 p3:p3];

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• Can one connection get details of another? Or, how can I get the most detailed pending transaction

  - by bob-the-destroyer

  Is there a Mysql statement which provides full details of any other open connection or user? For this particular case, on myisam tables specifically. Looking at Mysql's SHOW TABLE STATUS documentation, it's missing some very important information for my purpose. For example: remote odbc connection one is inserting several thousand records, which due to a slow connection speed can take up to an hour. Tcp connection two, using PHP on the server's localhost, is running select queries with aggregate functions on that data. Before allowing connection two to run those queries, I'd like connection two to first check to make sure there's no pending inserts on any other connection on those specific tables so it can instead wait until all data is available. If the table is currently being written to, I'd like to spit back to the user of connection two an approximation of how much longer to wait based on the number of pending inserts. Ideally by table, I'd like to get back using a query the timestamp when connection one began the write, total inserts left to be done, and total inserts already completed. Instead of insert counts, even knowing number of bytes written and left to write would work just fine here. Obviously since connection two is a tcp connection via a PHP script, all I can really use in that script is some sort of query. I suppose if I have to, since it is on localhost, I can exec() it if the only way is by a mysql command line option that outputs this info, but I'd rather not. I suppose I could simply update a custom-made transaction log before and after this massive insert task which the PHP script can check, but hopefully there's already a built-in Mysql feature I can take advantage of.

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• Numpy array, how to select indices satisfying multiple conditions?

  - by Bob

  Suppose I have a numpy array x = [5, 2, 3, 1, 4, 5], y = ['f', 'o', 'o', 'b', 'a', 'r']. I want to select the elements in y corresponding to elements in x that are greater than 1 and less than 5. I tried x = array([5, 2, 3, 1, 4, 5]) y = array(['f','o','o','b','a','r']) output = y[x > 1 & x < 5] # desired output is ['o','o','b','a'] but this doesn't work. How would I do this?

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• Which term to use when referring to functional data structures: persistent or immutable?

  - by Bob

  In the context of functional programming which is the correct term to use: persistent or immutable? When I Google "immutable data structures" I get a Wikipedia link to an article on "Persistent data structure" which even goes on to say: such data structures are effectively immutable Which further confuses things for me. Do functional programs rely on persistent data structures or immutable data structures? Or are they always the same thing?

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• Relationships via Email Rather Than User List

  - by Bob Lerner

  I'm new at Drupal, so I may have missed a solution despite a lot of research: I want users to be able to invite non-users and other users into a named relationship they've set up (using e.g. the Friendlist or User Relationships module) using only email addresses and not the user list. I believe that invitations from both of those modules are done only after the inviter selects the invitee after selecting the invitee from a list of all users. Frankly, I would be surprised if no email solution exists since a large site's user list would be daunting. Does anyone know if this is possible using Organic Groups? Thanks very much.

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• How to filter current url using php

  - by bob

  Example current URL http://www.domain.com/subdomain/install/finish.php I use this code to get the current URL. $url = (!empty($_SERVER['HTTPS'])) ? "https://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'] : "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']; Now I want to get the URL looks like http://www.domain.com/subdomain if there don't have sub-folder it will read like http://www.domain.com Let me know.

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• Scripts fail when jQuery.js isn't cached. When cached, scripts run fine.

  - by Bob

  I have jQuery UI Tabs which load their content via AJAX. About once every 15 times when the entire page is loaded (not just XHR), things fail and I don't see the proper content in the tab. Fiddler showed me that when things fail I also see that jQuery.js and jQuery-ui.js are both sent to the browser in full (~100kB). Normally, a page load results in HTTP status code 304 for both of those files, they're not re-downloaded, and the page displays properly. When the status code is 200 and fresh copies of jQuery/UI are sent, things fail. I notice this most often in IE8, but that's because I use it for web development. I have seen it in Firefox, but for some reason I can't reproduce it now. Fiddler shows that the HTTP request asks for: GET /Scripts/jquery-1.3.2.min.js?_=1255309685187 HTTP/1.1 I can't figure out what the ?_=1255309685187 is for, but I'm guessing it's a token to indicate for how long the file should be cached. Since I can't reproduce the problem in Firefox right now, I don't know what Firebug says. Any insight would be appreciated. EDIT: This is with Visual Studio's development webserver.

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• Rails upload file to ftp server

  - by Bob

  I'm on Rails 2.3.5 and Ruby 1.8.6 and trying to figure out how to let a user upload a file to a FTP server on a different machine than my Rails app. Also my Rails app will be hosted on Heroku which doesn't facilitate the writing of files to the local filesystem. index.html.erb <% form_tag '/ftp/upload', :method => :post, :multipart => true do %> <label for="file">File to Upload</label> <%= file_field_tag "file" %> <%= submit_tag 'Upload' %> <% end %> ftp_controller.rb require 'net/ftp' class FtpController < ApplicationController def upload file = params[:file] ftp = Net::FTP.new('remote-ftp-server') ftp.login(user = "***", passwd = "***") ftp.puttextfile(file.read, File.basename(file.original_filename)) ftp.quit() end def index end end Currently I'm just trying to get the Rails app to work on my Windows laptop. With the above code, I'm getting this error Errno::ENOENT in FtpController#upload No such file or directory -.... followed by a dump of the file contents Anyone knows what's going on?

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• How do I make a background thread in Java that allows the main application to exit completely? This

  - by Bob

  I have a Java application that creates a new thread to do some work. I can launch the new thread with no problems. When the "main" program terminates, I want the thread I created to keep running - which it does... But the problem is, when I run the main application from Eclipse or from Ant under Windows, control doesn't return unless the background process is killed. If I fork the main java process in ant, I want control to return to ant once the main thread is done with its work... But as it is, ant continues to wait until both the main process and the created thread are both terminated. How do I launch the thread in the background such that control will return to ant when the "main" application is finished? (By the way, when I run the same application under Linux, I am able to do this with no problems).

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• Can't catch newConnection() signal from QTcpServer

  - by Bob

  I am trying to make a simple server thread in QT to accept a connection, however although the server is listening (I can connect with my test app) I can't get the newConnection() signal to be acted on. Any help as to what I'm missing here would be much appreciated! class CServerThread : public QThread { Q_OBJECT protected: void run(); private: QTcpServer* server; public slots: void AcceptConnection(); }; void CServerThread::run() { server = new QTcpServer; QObject::connect(server, SIGNAL(newConnection()), this, SLOT(AcceptConnection())); server-listen(QHostAddress::Any, 1000); // Any port in a storm exec(); // Start event loop } void CServerThread::AcceptConnection() { OutputDebugStringA("\n***** INCOMING CONNECTION"); // This is never called! }

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• Why are web developers so keen to use lists ?

  - by Bob

  I've been developing for a while and often develop sites using menu tabs. And I can't figure out why so many web developers like using lists < ul < li etc rather than just using plain old divs. I can make menus in divs which are simple and work perfectly in every browser. With lists, I'm usually trying to hack it one way or another to get it work properly. So my question is simple : why should I use lists to create my menus instead of divs ?

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• How to Split a Cell Part of a Row and Keep the Rest of the Rows - Google Spreadsheets

  - by user3527095

  I am trying to do the following: I have row 1. I have values A1, B1, and C1. A1 contains a few names separated by a comma. I want to split A1 by these names while copying over the values from B1 and C1 into the split columns of A1. For example, I have this: (A1 B1 C1) bob,sam,bill 99 10 I want to have this: bob 99 10 sam 99 10 bill 99 10 I am also doing this on Google Sheets, I tried using combinations of Split, Join, and Transpose but can't seem to figure it out. Any help would be appreciated, thanks. EDIT: any updates? EDIT: still trying to figure this out.

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• Mod Rewrite - Simple Question

  - by bob

  This is my current .htaccess Options +FollowSymLinks DirectoryIndex index.php RewriteEngine On RewriteBase /product/ RewriteCond %{ENV:REDIRECT_STATUS} ^$ RewriteRule ^(.+)\.php$ ./$1/ [R=301,L] RewriteCond %{SCRIPT_FILENAME} !-f RewriteRule [^/]$ %{REQUEST_URI}/ [R=301,L] RewriteRule ^contact/?$ ./contact.php [QSA,L] Everything is working fine now.. /product/contact return to /product/contact/ /product/contact.php return to /product/contact/ Question.. How to make all my .php will be /contact/ /help/ /faq/ Now I should to add contact.php help.php faq.php to the htaccess I tried to add RewriteRule ^(.*)/$ $1.php [QSA,L] but it will be return loop. Let me know how to fix it ;)

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• Drupal 7 Custom Module Error

  - by Bob

  I'm playing with a custom module in Drupal, but it gives me the following two warnings: Warning: Invalid argument supplied for foreach() in menu_unserialize() (line 377 of /site/includes/menu.inc). Warning: Invalid argument supplied for foreach() in menu_unserialize() (line 377 of /site/includes/menu.inc). Here is the module's code: <?php function homepage_coords_menu(){ $items = array('homepage_coords/%/%/%' => array( 'page callback' => 'homepage_coords_ajax_callback', 'page arguments' => array(1,2,3), 'access arguments' => TRUE, 'type' => MENU_CALLBACK, )); return $items; } function homepage_coords_ajax_callback($nid=0,$x=0,$y=0){ return 'nid:'.$nid.' x:'.$x.' y:'.$y; } ?> What can I do to fix these warnings? Also any effeciency improvements would be appreciated :)

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• How to suppress warnings in external headers in Visual C++

  - by Bob Whiteman

  I'm starting a new BREW project, and I'd like to compile with Warning Level 4 (/W4) to keep the application code nice and clean. The problem is that the BREW headers themselves don't compile cleanly with /W4. In gcc you can differentiate between application and system headers by using -I and -isystem, and then by default gcc doesn't report any compilation warnings in system headers. Is there an equivalent mechanism in Visual C++?

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• Rails time zones

  - by Bob

  I'm calling an external web service API that returns a timezone as listed in the Olson timezones database (e.g. "America/New_York"). However some of the values the API returned are "US/Pacific", "US/Eastern" and apparently don't match any of the Olson timezones in Rails 2.3.2. Can anyone shed some light on this? Thanks in advance for your help.

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• Android - BitmapFactory.decodeByteArray - OutOfMemoryError (OOM)

  - by Bob Keathley

  I have read 100s of article about the OOM problem. Most are in regard to large bitmaps. I am doing a mapping application where we download 256x256 weather overlay tiles. Most are totally transparent and very small. I just got a crash on a bitmap stream that was 442 Bytes long while calling BitmapFactory.decodeByteArray(....). The Exception states: java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=9415KB, Allocated=5192KB, Bitmap Size=23671KB) The code is: protected Bitmap retrieveImageData() throws IOException { URL url = new URL(imageUrl); InputStream in = null; OutputStream out = null; HttpURLConnection connection = (HttpURLConnection) url.openConnection(); // determine the image size and allocate a buffer int fileSize = connection.getContentLength(); if (fileSize < 0) { return null; } byte[] imageData = new byte[fileSize]; // download the file //Log.d(LOG_TAG, "fetching image " + imageUrl + " (" + fileSize + ")"); BufferedInputStream istream = new BufferedInputStream(connection.getInputStream()); int bytesRead = 0; int offset = 0; while (bytesRead != -1 && offset < fileSize) { bytesRead = istream.read(imageData, offset, fileSize - offset); offset += bytesRead; } // clean up istream.close(); connection.disconnect(); Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeByteArray(imageData, 0, bytesRead); } catch (OutOfMemoryError e) { Log.e("Map", "Tile Loader (241) Out Of Memory Error " + e.getLocalizedMessage()); System.gc(); } return bitmap; } Here is what I see in the debugger: bytesRead = 442 So the Bitmap data is 442 Bytes. Why would it be trying to create a 23671KB Bitmap and running out of memory?

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