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• What are the Ruby equivalent of Python itertools, esp. combinations/permutations/groupby?

  - by Amadeus

  Python's itertools module provides a lots of goodies with respect to processing an iterable/iterator by use of generators. For example, permutations(range(3)) --> 012 021 102 120 201 210 combinations('ABCD', 2) --> AB AC AD BC BD CD [list(g) for k, g in groupby('AAAABBBCCD')] --> AAAA BBB CC D What are the equivalent in Ruby? By equivalent, I mean fast and memory efficient (Python's itertools module is written in C).

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• Is there anything else I can do to optimize this MySQL query?

  - by Legend

  I have two tables, Table A with 700,000 entries and Table B with 600,000 entries. The structure is as follows: Table A: +-----------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number | bigint(20) unsigned | YES | | NULL | | +-----------+---------------------+------+-----+---------+----------------+ Table B: +-------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+---------------------+------+-----+---------+----------------+ | id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | number_s | bigint(20) unsigned | YES | MUL | NULL | | | number_e | bigint(20) unsigned | YES | MUL | NULL | | | source | varchar(50) | YES | | NULL | | +-------------+---------------------+------+-----+---------+----------------+ I am trying to find if any of the values in Table A are present in Table B using the following code: $sql = "SELECT number from TableA"; $result = mysql_query($sql) or die(mysql_error()); while($row = mysql_fetch_assoc($result)) { $number = $row['number']; $sql = "SELECT source, count(source) FROM TableB WHERE number_s < $number AND number_e > $number GROUP BY source"; $re = mysql_query($sql) or die(mysql_error); while($ro = mysql_fetch_array($re)) { echo $number."\t".$ro[0]."\t".$ro[1]."\n"; } } I was hoping that the query would go fast but then for some reason, it isn't terrible fast. My explain on the select (with a particular value of "number") gives me the following: mysql> explain SELECT source, count(source) FROM TableB WHERE number_s < 1812194440 AND number_e > 1812194440 GROUP BY source; +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ | 1 | SIMPLE | TableB | ALL | number_s,number_e | NULL | NULL | NULL | 696325 | Using where; Using temporary; Using filesort | +----+-------------+------------+------+-------------------------+------+---------+------+--------+----------------------------------------------+ 1 row in set (0.00 sec) Is there any optimization that I can squeeze out of this? I tried writing a stored procedure for the same task but it doesn't even seem to work in the first place... It doesn't give any syntax errors... I tried running it for a day and it was still running which felt odd. CREATE PROCEDURE Filter() Begin DECLARE number BIGINT UNSIGNED; DECLARE x INT; DECLARE done INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT number FROM TableA; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; CREATE TEMPORARY TABLE IF NOT EXISTS Flags(number bigint unsigned, count int(11)); OPEN cur1; hist_loop: LOOP FETCH cur1 INTO number; SELECT count(*) from TableB WHERE number_s < number AND number_e > number INTO x; IF done = 1 THEN LEAVE hist_loop; END IF; IF x IS NOT NULL AND x>0 THEN INSERT INTO Flags(number, count) VALUES(number, x); END IF; END LOOP hist_loop; CLOSE cur1; END

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• What happens with TCP packets between 2 Socket.BeginReceive Call??

  - by Rodrigo

  Hi, i have a doubt about Socket Programming, i am developing a TCP packets Sniffer, i am using Socket.BeginAccept, Socket.BeginReceive to capture every packet, but when a packet is received i have to process something, it is a fast operation, but would take some milliseconds, and then call the BeginReceive again. My question is, what would happen if some packets are sent while i am processing, and havent called BeginReceive??...are lost?...are buffered internally?...is there a limit?... Thanks in advance.

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• Optimize MYSQL Query with Order by

  - by Victor

  Hello, I have seen mysql queries with order by runs slow. Is there any specific way to optimize queries which use order by ? Queries without order by run very fast but with order by its always runs slow. if any one suggest any thing on this as general solutions. Thank You

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• Flex: Failing gracefully on ReferenceError: Error #1056:

  - by Chin

  Hi I have a text field which I would like to bind to a dynamic object. <mx:TextInput id="ti4" text="{selectedObj['someProp']}" valueCommit="{selectedObj['someProp'] = ti4.text}" x="1011.5" y="835"/> If the property doesn't exist I get a reference error - Is there any way to fail a little more gracefully? Any ideas much appreciated.

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• append files to an archive without reading/rewriting the whole archive

  - by bene

  I've got many files that I want to store in a single archive file. My first approach was to store the files in a gzipped tarball. The problem is, that I've to rewrite the whole archive if a single file is added. I could get rid of the gzip compression, but adding a file would still be expensive. What other archive format would you suggest that allows fast append operations?

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• How do I deny access to invalid web subdomains with .htaccess?

  - by Gravitas

  The following .htaccess file does not work: SSLrequireSSL RewriteEngine on RewriteCond %{HTTP_HOST} !^secure\.neuralfutures\.com [NC] RewriteRule (.*) - [F] I'm trying to prevent access to anything but "https://secure.neuralfutures.com/docs/", i.e. "https://www.neuralfutures.com/docs/" will fail. I also seem to be running into caching issues: if I upload the new .htaccess with CuteFTP, then do a file refresh in FireFox, it doesn't seem to have any effect on the output at all. I can tell this because if I comment out SSLrequireSSL, it still disallows a http:// request.

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• prevent other event keydown on change

  - by Nik

  Hi, on my textbox i have 2 events onchange and keydown(for enter) now i did validation on onchange event if any validation fail then i raise alert but when i press press enter button if validation failed then i dont want to execute keydown event any suggestion Thanks, Nik

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• Python: Convert a string to an integer

  - by Adam Nelson

  Does anybody have a quickie for converting an unsafe string to an int? The string typically comes back as: '234\r\n' or something like that. In this case I want 234. If '-1\r\n', I want -1. I never want the method to fail but I don't want to go so far as try, except, pass just to hide errors either (in case something extreme happens).

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• What method should be used for searching this mysql dataset?

  - by GeoffreyF67

  I've got a mysql dataset that contains 86 million rows. I need to have a relatively fast search through this data. The data I'll be searching through is all strings. I also need to do partial matches. Now, if I have 'foobar' and search for '%oob%' I know it'll be really slow - it has to look at every row to see if there is a match. What methods can be used to speed queries like this up? G-Man

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• Silverlight Assembly.Load() only works with the full/strong name

  - by chris

  Apparently the implementation of Assembly.Load() in Silverlight needs a full/strong name. E.g. this works: Assembly.Load("MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=..."); while this will fail even if MyAssembly is already loaded: Assembly.Load("MyAssembly"); Is there a workaround so that it's possible to use the simple name?

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• Returning content directly from memcache - Django / HTTP Server

  - by RadiantHex

  Hi folks, I've built a web application with Django, I'm using Memcached in order to cache data. A few views cache the whole HttpResponse objects, therefore there might be a better alternative for returning the Memcached data other than going through Django. What could be faster alternatives for returning Memcached data on HTTP Requests ? I'm trying to make the operation as fast and lightweight as possible. Help would be much appreciated! :)

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• How to manually throw a compiler error in GCC and Xcode

  - by coneybeare

  In xcode, while compiling apps with gcc, I want to throw compilation time errors if things like NSZombieEnabled is on for a distribution release, thus ensuring that compilation will fail and I won't accidentally do something stupid. I did some googling, but could not figure out how to cause the compiler to bail if a certain condition is met. Surely it must be easy, am I just not finding it?

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• What has your experience been like developing for the Netbeans platform for cross platform developme

  - by Magwich

  I am familiar with the Netbeans IDE, but I want to know about people's experience with using Netbeans as a development platform (i.e. using its prebuilt modules for fast gui development). I have a program that I want to write, and I am thinking about using this platform.

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• .net VS2008 compilation analyzer tool ?

  - by Matthieu

  Hi, I'm looking for a tool that allows me to analyze the compilation of a VS Solution (about 30 VS projects inside). I would like to know after the global solution compilation, which projets fail and forward errors to developers. Of course, I could analyze the compilation report... but I'm pretty sure that great tools are available ! What is for you the best one ? Thanks a lot !

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• 4 Minute Delay Between New User Registration and Receipt of Activation Email

  - by John

  Hello, I am using a PHP/MySQL login script that sends a new user an activation email. When a new user registers, the info is put into MySQL pretty much instantly, but then it takes about 4 minutes for the activation email to arrive in the new user's inbox. It seems like sites like Facebook and Twitter can get out an activation email instantly when a new user registers. Is there anything that I could do to make the activation email that I'm using arrive instantly or really fast? Thanks in advance, John

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• Encoding MP3 and adding VBR or Xing headers (with lame or another method)

  - by J. Pablo Fernández

  I'm writing a program that converts wavs to mp3s, so far, by using lame. It's generating a command line more or less like this: "c:\Program Files (x86)\Lame for Audacity\lame.exe" --preset fast medium in.wav out.mp3 The problem I'm having is that no VBR or Xing headers are written to the MP3. How can I make lame.exe write those headers? Should I use another program to write those headers (platform is Windows, .Net 3.5)? Should I use another program for MP3 encoding?

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• winwindows programming problem

  - by Jayjitraj

  I want to write programming which will connect to a network for some second then disconnect from it and it should be that much fast that other application should not fill it is disconnected so on which layer should i program i know how to disconnect and connect to the network so any suggestion ...... thanks in advance....

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• Windows API Programming

  - by Chris

  I found this site, http://www.apitalk.com/document.php?id=1184207999_1 and I'm not sure if this site is using ATL, STL, MFC, or just calling API functions directly. I have done console programming with C++ and graphics programmign with C++ in Borland, but I've have never done Win32 C++ programming and I'm curious if anyone knows of a good site to start with? Does anyone know of any good sites to recommend about getting up and going fast with Win32 API C++?

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• matlab - int array to binary array

  - by asel

  hi, currently in matlab i have int array a=[3,4,5,6,7]; i want to convert it to binary array with four bits each. for the above int array i would get the following binary array abinary=[0,0,1,1, 0,1,0,0, 0,1,0,1, 0,1,1,0, 0,1,1,1]; is there any fast way to do it? thanks a lot!

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• Ruby or PHP or Php Framework?

  - by the_

  I am starting a website and am wondering if I should go with PHP, a php framework, or ruby on rails? I want to make a website fast, easiest and without a big learning curve. I already know a little bit of php and a little ruby on rails...But which would be best? OK so to clarify more on the topic of what my site will be, It's basically a Classified Ads website that needs to have a user login, ability to post classifieds, and categorizing, and basically anything else a classified website has.

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• windows programming problem

  - by Jayjitraj

  I want to write programming which will connect to a network for some second then disconnect from it and it should be that much fast that other application should not fill it is disconnected so on which layer should i program i know how to disconnect and connect to the network so any suggestion ...... thanks in advance....

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• Regex for capturing number in brackets

  - by neversaint

  I have a lines like this NF419andZNF773 (e=10^-92,). ZNF571 (e=2 10^-14,) What's the regex for extracting the results above so that it gives NF419andZNF773 - 10^-92 ZNF571 - 2 10^-14 I tried this but fail. $line =~ /(\w+)\s\(e=\s(.*),\)/; print "$1 - $2\n";

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• Why is there no way to resize SRFI-4 vectors in Scheme?

  - by Jay

  I see that SRFI 4 does not mention resizing of vectors. I'm using f64vectors (for which I need fast access), and I'd like to be able to resize them quickly (similar to what realloc does in C), and not necessarily copy the whole vector. Since I didn't find any references to a "resize-f64vector" procedure, I'd like to know why it doesn't exist (and if making a new vector and copying over is my only option).

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• lua table C api

  - by anon

  I know of: http://lua-users.org/wiki/SimpleLuaApiExample It shows me how to build up a table (key, value) pair entry by entry. Suppose instead, I want to build a gigantic table (say something a 1000 entry table, where both key & value are strings), is there a fast way to do this in lua (rather than 4 func calls per entry: push key value rawset Thanks!

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