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• "Anagram solver" based on statistics rather than a dictionary/table?

  - by James M.

  My problem is conceptually similar to solving anagrams, except I can't just use a dictionary lookup. I am trying to find plausible words rather than real words. I have created an N-gram model (for now, N=2) based on the letters in a bunch of text. Now, given a random sequence of letters, I would like to permute them into the most likely sequence according to the transition probabilities. I thought I would need the Viterbi algorithm when I started this, but as I look deeper, the Viterbi algorithm optimizes a sequence of hidden random variables based on the observed output. I am trying to optimize the output sequence. Is there a well-known algorithm for this that I can read about? Or am I on the right track with Viterbi and I'm just not seeing how to apply it?

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• Algorithms for modern hardware?

  - by Jurily

  Once again, I find myself with a set of broken assumptions. The article itself is about a 10x performance gain by modifying a proven-optimal algorithm to account for virtual memory: What good is an O(log2(n)) algorithm if those operations cause page faults and slow disk operations? For most relevant datasets an O(n) or even an O(n^2) algorithm, which avoids page faults, will run circles around it. Are there more such algorithms around? Should we re-examine all those fundamental building blocks of our education? What else do I need to watch out for when writing my own?

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• Summarize object area with a Hash in Ruby

  - by Arto Uusikangas

  require 'sketchup' entities = Sketchup.active_model.entities summa = Hash.new for face in entities next unless face.kind_of? Sketchup::Face if (face.material) summa[face.material.display_name] += face.area end end Im trying to get the structure in the array as such: summa { "Bricks" = 500, "Planks" = 4000 } Making a ruby script for Google Sketchup btw But if I run this code i only get Error: #+' for nil:NilClass> C:\Program Files (x86)\Google\Google SketchUp 7\Plugins\test.rb:17 C:\Program Files (x86)\Google\Google SketchUp 7\Plugins\test.rb:14:ineach' C:\Program Files (x86)\Google\Google SketchUp 7\Plugins\test.rb:14 C:\Program Files (x86)\Google\Google SketchUp 7\Plugins\test.rb:8:in `call' As im used to using PHP and just doing $array['myownassoc'] += bignumber; But i guess this isnt the right approach when using Ruby? So any help in how i need to go would be nice.

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• Longest substring that appears n times

  - by xcoders

  For a string of length L, I want to find the longest substring that appears n (n<L) or more times in ths string. For example, the longest substring that occurs 2 or more times in "BANANA" is "ANA", once starting from index 1, and once again starting from index 3. The substrings are allowed to overlap. In the string "FFFFFF", the longest string that appears 3 or more times is "FFFF". The brute force algorithm for n=2 would be selecting all pairs of indexes in the string, then running along until the characters are different. The running-along part takes O(L) and the number of pairs is O(L^2) (duplicates are not allowed but I'm ignoring that) so the complexity of this algorithm for n=2 would be O(L^3). For greater values of n, this grows exponentially. Is there a more efficient algorithm for this problem?

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• Stable separation for two classes of elements in an array

  - by AndreyT

  Consider the following problem. We are given an array of elements belonging to one two classes: either red or blue. We have to rearrange the elements of the array so that all blue elements come first (and all red elements follow). The rearrangement must be done is stable fashion, meaning that the relative order of blue elements must be preserved (same for red ones). Is there a clever algorithm that would perform the above rearrangement in-place? A non-in place solution is, of course, straightforward. An obvious in-place solution would be to apply any stable sorting algorithm to the array. However, using a full-fledged sorting algorithm on an array intuitively feels like an overkill, especially taking into account the fact that we are only dealing with two classes of elements. Any ideas greatly appreciated.

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• String Occurance Counting Algorithm

  - by Hellnar

  Hello, I am curious what is the most efficient algorithm (or commonly used) to count the number of occurances of a string in a chunck of text. From what I read, Boyer–Moore string search algorithm is the standard for string search but I am not sure if counting occurance in an efficient way would be same as searching a string. In python this is what I want: text_chunck = "one two three four one five six one" occurance_count(text_chunck, "one") # gives 3. Regards EDIT: It seems like python str.count serves me such method however I am not able to find what algorithm it uses.

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• Sorting array of 1000 distinct integers in the range [1, 5000], accessing each element at most once

  - by Cronydevil

  Suppose you have an array of 1000 integers. The integers are in random order, but you know each of the integers is between 1 and 5000 (inclusive). In addition, each number appears only once in the array. Assume that you can access each element of the array only once. Describe an algorithm to sort it. How i can sorting? If you used auxiliary storage in your algorithm, can you find an algorithm that remains O(n) space complexity?

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• C++ Function Calling Itself

  - by Ben

  Suppose I wish to have a function that fills an array either in pattern x,y,x,y,x,ywhere x and y are variables defined by some algorithm and x,y,z,x,y,z where x, y and z are variables defined by the same algorithm. This should continue for all number of variables. Is this a viable way to implement it. int recurse_n(int n) { while(n > 0) { --n; recurse_n(n); n = 0; // Use algorithm here } }

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• how to use replace_regex_copy() from boost::algorithm library?

  - by Vincenzo

  This is my code: #include <string> #include <boost/algorithm/string/regex.hpp> string f(const string& s) { using namespace boost::algorithm; return replace_regex_copy(s, "\\w", "?"); } This is what compiler says: no matching function for call to ‘replace_regex_copy(const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::string, std::string) The link to the library: http://www.boost.org/doc/libs/1_43_0/doc/html/boost/algorithm/replace_regex_copy.html Could anyone please help? Thanks! ps. Boost library is in place, since other functions from it work fine.

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• Will PHP script running on top of Apache be faster than C# stand alloun programm doing same thing (s

  - by Ole Jak

  I mean PHP scripts on Apache are oriented for many users to use tham at the same time. So will 1000 requests which came at the (relativly) same time be fully responsed faster than C# .Net programm perfoming algorithm 1000 times in while loop? So we input same data, we perform same algorithm, which is written in a wary same way (respecting language diferencis ofcourse), outputing same data (lat us say saving it to file for tham to be relativly equal) Who will be faster on some 1000 times of performing O(NN) algorithm, in which case (if it is possible) one will owerrun another?

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• importing app engine sample in eclipse

  - by tsey76

  Downloaded GAE sample code and copied into Eclipse pydev explorer and got following errors on execution Traceback (most recent call last): File "C:\Program Files\Google\google_appengine\dev_appserver.py", line 67, in <module> run_file(__file__, globals()) File "C:\Program Files\Google\google_appengine\dev_appserver.py", line 63, in run_file execfile(script_path, globals_) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 417, in <module> sys.exit(main(sys.argv)) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 360, in main config, matcher = dev_appserver.LoadAppConfig(root_path, {}) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3441, in LoadAppConfig raise AppConfigNotFoundError google.appengine.tools.dev_appserver.AppConfigNotFoundError

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• How to set up spf records to send mail from google hosted apps to gmail addresses

  - by Chris Adams

  Hi there, I'm trying to work out why email I send from one domain I own is rejected by another that I own, and while I think it may be related to how I've setup spf records, I'm not sure what steps I need to take to fix it. Here's the error message I receive: Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550-Verification failed for <[email protected]> 550-No Such User Here 550 Sender verify failed (state 14). Here's the response from [email protected] Delivered-To: [email protected] Received: by 10.86.92.9 with SMTP id p9cs85371fgb; Wed, 2 Sep 2009 22:33:32 -0700 (PDT) Received: by 10.90.205.4 with SMTP id c4mr2406190agg.29.1251956007562; Wed, 02 Sep 2009 22:33:27 -0700 (PDT) Return-Path: <[email protected]> Received: from verifier.port25.com (207-36-201-235.ptr.primarydns.com [207.36.201.235]) by mx.google.com with ESMTP id 26si831174aga.24.2009.09.02.22.33.25; Wed, 02 Sep 2009 22:33:26 -0700 (PDT) Received-SPF: pass (google.com: domain of [email protected] designates 207.36.201.235 as permitted sender) client-ip=207.36.201.235; Authentication-Results: mx.google.com; spf=pass (google.com: domain of [email protected] designates 207.36.201.235 as permitted sender) [email protected]; dkim=pass [email protected] DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=auth; d=port25.com; h=Date:From:To:Subject:Message-Id:In-Reply-To; [email protected]; bh=GRMrcnoucTl4upzqJYTG5sOZMLU=; b=uk6TjADEyZVRkceQGjH94ZzfVeRTsiZPzbXuhlqDt1m+kh1zmdUEoiTOzd89ryCHMbVcnG1JajBj 5vOMKYtA3g== DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=auth; d=port25.com; b=NqKCPK00Xt49lbeO009xy4ZRgMGpghvcgfhjNy7+qI89XKTzi6IUW0hYqCQyHkd2p5a1Zjez2ZMC l0u9CpZD3Q==; Received: from verifier.port25.com (127.0.0.1) by verifier.port25.com (PowerMTA(TM) v3.6a1) id hjt9pq0hse8u for <[email protected]>; Thu, 3 Sep 2009 01:26:52 -0400 (envelope-from <[email protected]>) Date: Thu, 3 Sep 2009 01:26:52 -0400 From: [email protected] To: [email protected] Subject: Authentication Report Message-Id: <[email protected]> Precedence: junk (auto_reply) In-Reply-To: <[email protected]> This message is an automatic response from Port25's authentication verifier service at verifier.port25.com. The service allows email senders to perform a simple check of various sender authentication mechanisms. It is provided free of charge, in the hope that it is useful to the email community. While it is not officially supported, we welcome any feedback you may have at <[email protected]>. Thank you for using the verifier, The Port25 Solutions, Inc. team ========================================================== Summary of Results ========================================================== SPF check: pass DomainKeys check: neutral DKIM check: neutral Sender-ID check: pass SpamAssassin check: ham ========================================================== Details: ========================================================== HELO hostname: fg-out-1718.google.com Source IP: 72.14.220.158 mail-from: [email protected] ---------------------------------------------------------- SPF check details: ---------------------------------------------------------- Result: pass ID(s) verified: [email protected] DNS record(s): stemcel.co.uk. 14400 IN TXT "v=spf1 include:aspmx.googlemail.com ~all" aspmx.googlemail.com. 7200 IN TXT "v=spf1 redirect=_spf.google.com" _spf.google.com. 300 IN TXT "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ?all" ---------------------------------------------------------- DomainKeys check details: ---------------------------------------------------------- Result: neutral (message not signed) ID(s) verified: [email protected] DNS record(s): ---------------------------------------------------------- DKIM check details: ---------------------------------------------------------- Result: neutral (message not signed) ID(s) verified: NOTE: DKIM checking has been performed based on the latest DKIM specs (RFC 4871 or draft-ietf-dkim-base-10) and verification may fail for older versions. If you are using Port25's PowerMTA, you need to use version 3.2r11 or later to get a compatible version of DKIM. ---------------------------------------------------------- Sender-ID check details: ---------------------------------------------------------- Result: pass ID(s) verified: [email protected] DNS record(s): stemcel.co.uk. 14400 IN TXT "v=spf1 include:aspmx.googlemail.com ~all" aspmx.googlemail.com. 7200 IN TXT "v=spf1 redirect=_spf.google.com" _spf.google.com. 300 IN TXT "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ?all" ---------------------------------------------------------- SpamAssassin check details: ---------------------------------------------------------- SpamAssassin v3.2.5 (2008-06-10) Result: ham (-2.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] 0.0 HTML_MESSAGE BODY: HTML included in message I've registered the spf records for my domain, as advised here Both domains pass validate according to Kitterman's spf record testing tools, so I'm somewhat confused about this. I also have the catchall address set up on the stemcel.co.uk domain here, but I don't have one setup for chrisadams.me.uk. Instead, we have the following forwarders setup [email protected] to [email protected] [email protected] to [email protected] [email protected] to [email protected] [email protected] to [email protected] Any ideas how to get this working? I'm not sure what I should be looking for here.

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• Domain transfer from Yahoo to Godaddy. Google apps downtime

  - by Kedar

  I am moving my domain from Yahoo to Godaddy (cause yahoo charges ridiculously hugh amounts than others). My problem is I use this domain for Google apps and one of those is my custom email. So here are a few questions that I have - 1) Godaddy told me there is going to be a 48 hours of downtime. Is there anything that I can do to minimize the downtime? 2) Will I lose all the email that I get during this downtime? or they be stored in the cloud and bulk emailed me once my domain is up with Godaddy? If they are lost is there any workaround to forward them to my gmail during the downtime (i know sounds stupid, but I have to ask). Any help is much appreciated. Thanks in advance.

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• Google and Yahoo redirect my site to malware, but direct url works fine. Any computer

  - by UserZer0

  I can go directly to the site doublewing.org or www. without issue, but if I click on the link in google or yahoo it redirects to spam sites. Swagbucks works though! This is not on a single computer this happens on systems isolated from each other(Try it, avast blocks it) . The site is runing joomla 1.5.25 . I deleted .htacces, put fresh index.php and index2.php files. and still get the same results. Any ideas?

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• Why did Google remove the search box in developer tool from Chrome 22 stable release?

  - by Bruce

  In previous version of Chrome, there's the search box in developer tool, on the right top when I open it, just as shown below. (Sorry I can't upload image cuz' I don't have enough reputation for now.) http://i.minus.com/iklSx2vi0uzFB.JPG But, after I upgraded to the first release of Chrome 22 yesterday, that search box was gone, as shown below. http://i.minus.com/ibxXt9wnBekR7E.JPG It is such a useful search box that I rely on all the time, to search for something, or to validate an xpath. So does Google just 'hide' it somewhere else? Or do they really remove it? Anyone know why they made such changes?

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• Restricted blogspot account. Unable to subscribe using Google Reader?

  - by keisimone

  I used blogspot.com and restricted its viewership to just its authors. However I cannot use Google Reader to subscribe to the RSS feed. Is there a workaround? I need to be notified somehow whenever somebody posts to that private blog. I am one of its authors. My blogspot.com allows me to set the readership to just its authors. So that is what I have done. I did not do any password protect settings at all.

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• Issue with user having a gmail account and Google Apps account using same email/username

  - by Joshua

  Greetings! We have a user in our organization that had been using her email address at our domain at her username for gmail.com We recently moved our folks on to Google Apps, and have just moved our email server over to Google (IMAP/SMTP). I'm having all kinds of trouble only with this user's account with her sending and receiving email via the new Google mail server and wondering if it's because of her existing Gmail account. So her email address with us is [email protected], which is her login/user id with us on our Google Apps site. She still has her gmail identity tied to that same [email protected]. She's ok with deleting her old Gmail account...if I do so however will it goof things up for her going forward with us on the Google Apps site? Will she not be able to receive email? Thanks! Joshua

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• How to disable or edit Google Chrome Developer Tools shortcut?

  - by HoLyVieR

  There is a shortcut in the Google Chrome Developer Tools which happen to trigger every times I try to type the [ or ] character in the console. The shortcut in question probably is Alt+[, Alt+^ or [ and it moves the tabs (of the Chrome Developer Tools) to the last selected one. This shortcut is simply blocking me from typing the [ or ] in the console and I want to either disable it or edit it to something else. How can I edit or disable that shortcut ? Note : I'm not really using the shortcut in the developers tools, so if it's only possible to disable all shortcut it would be a viable solution.

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• How to make Google Chrome honor my Windows dpi setting?

  - by Ian Boyd

  Google Chrome doesn't seem to respect my dpi-setting in Windows. i run at 150 dpi, but Chrome ignores that; meaning that images and text are teeeeeeny tiny. i hit Ctrl + + Ctrl + + to zoom in. Unfortunatly every new tab, or new window, defaults to the 100% teeny tiny zoom level. Is it possible for either: Chrome to respect my Windows dpi setting? Chrome to remember my zoom preference? Keywords: chrome, high dpi, accessibility Checked version: 4.0.249.78

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• What is the most relevant statistic information from Google Analytics for website optimalisation? [c

  - by Paulo

  I was wondering, what is considered the best statistic information from Google Analytics for website optimalisation? Example 1: Alot of visitors leave the website on a specific page, this could be because there aren't enough forwards / links on that page so that the visitors don't see a reason to continue their travel on the website. Example 2: Your traffic sources are 70% direct visits, 28% redirects from other websites and 2% by search engine. You could say that your website is not easily findable in search engines which could be interpreted as a sign that your keywords and/or meta description aren't good enough to be found. I'd like to hear some from other people!

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• How do I directly add/pin web page to Google Chrome jump list?

  - by irrational John

  Sometimes I want to (easily) add the link for a web page I'm viewing with Google Chrome to Chome's Windows 7 jump list. Is there a way to do this? I have tried dragging the bookmark/star to the left of the URL in the address bar onto Chrome's jump list, but this doesn't seem to "take". The only way I have found that works is rather kludgey. If I close the tab for the page I want to add then it shows up in the jump list under "Recently Closed". I can then pin the link to the jump list. It would be nice to have a way to add a web page to the jump list without first having to close it.

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• How to fix audio/game stuttering in Google Chrome's Flash plug-in?

  - by Simon Belmont

  I'm having an issue. Windows XP, running the latest Chrome 23 build. I'm using Flash 11.5 built into Chrome (Pepper Flash). It runs horribly. Chrome 22 did not have this issue as far as I recall. What a shame. YouTube videos stutter badly and after a while, they begin to lag and lose sync with the video. I disabled Pepper Flash and tested HTML5 video in YouTube and it was smooth as glass. Additionally, certain Flash based games are almost unusable now. The plug-in is using 100% CPU and it lags horribly in these games. Google/Adobe, please fix this. I shouldn't have to disable the built-in Flash plug-in (with added sandboxing security) and use regular Flash to resolve this. Short of waiting for an update to Chrome, does anyone have a better solution to fixing this? I am all ears.

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• How to modify the language used by the Google Search Engine on IE 9.0?

  - by Seb Killer

  I would like to know how we can modify the settings of the Google Search Engine used in Internet Explorer 9.0 to force to use a specific language. Our problem is the following: as it uses geolocation by default, and we are in Switzerland, it takes the first of the official languages this is Swiss-German. However, we are located in Geneva where French is the official language. Furthermore, as most of our users speak English, we would like to force the language to be English and not Swiss-German. Does anybody know how to achieve this ? Thanks alot, Sébastien

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• Is there any two-panels bookmarks manager for Google Chrome?

  - by L. Shaydariv

  Hi to all. I'm just wondering, is there any two-panels-interface (like Total Commander, File Manager, etc) bookmark manager, extension, etc for Google Chrome? Using of the default bookmark manager is not so suitable because of two reasons: 1) I've gathered a very large collection of bookmarks (please, don't ask why) 2) bookmarks hierarchy tree always expands its branches when the bookmark manager is open (this makes the moving of bookmarks through the bookmark tree much and much harder). I tried to use Link Commander but it's very and very slow. Any suggestions? Thank you for advices.

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• Is there keyboard shortcut to move input focus to the Google Search box?

  - by Chen Jun

  I'm searching on Google a lot. I find it very annoying to move my mouse to the search box and click once so that I can input another search term. I did Googled some time, but no one seems to be annoyed with this, quite unbelievable. I'm using Firefox 8 and Chrome 16, on Windows 7. If you know Atlassian Confluence, you might probably know that pressing / will move input focus to the upper right search box, very convenient for a keyboard shortcut hobbyist . Try it here.

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