Traveling Salesperson: The Most Misunderstood Problem » Rod Hilton
Whenever people start talking about NP-Complete problems, or even NP problems, one of the first examples they reach for is the classic Traveling Salesperson Problem. TSP makes sense because it intuitively can’t be solved quickly due to how difficult the problem sounds, so it’s reasonable for people to use it in discussions about P versus NP. The problem is, 99% of the time people discuss Traveling
CodernityDB pure python, fast, NoSQL database — CodernityDB
CodernityDB pure python, fast, NoSQL database¶ CodernityDB is opensource, pure Python (no 3rd party dependency), fast (even 100 000 insert and more than 100 000 get operations per second, check Speed if you don’t believe in words), multi platform, schema-less, NoSQL database. You can also call it a more advanced key-value database, with multiple key-values indexes in the same engine (for sure it’s
HowTo/Sorting - Python Wiki
Sorting Mini-HOW TO Original version by Andrew Dalke with a major update by Raymond Hettinger Python lists have a built-in sort() method that modifies the list in-place and a sorted() built-in function that builds a new sorted list from an iterable. There are many ways to use them to sort data and there doesn't appear to be a single, central place in the various manuals describing them, so I'll do
Railsアプリのパフォーマンスチューニング用ツール紹介 - Qiita
class ApplicationController < ActionController::Base before_filter :profile_for_admins # ... def authorize if Rails.env.development? || current_user.try(:staff?) Rack::MiniProfiler.authorize_request end end end 左上に各リクエスト(XHRなど)でかかった時間が表示される．発行されたSQLごとの処理時間も見られる． 参考リンク: #368 MiniProfiler - RailsCasts SQLをざっと見てみて，明らかに無駄なSQLを排除していく． かかった時間ごとにSQLをソートしてくれたらいいのに… flyerhzm/bullet N+1クエリ問題や不要なeager loadin
POSIX Threads Programming
Author: Blaise Barney, Lawrence Livermore National Laboratory, UCRL-MI-133316 Table of Contents Abstract Pthreads Overview What is a Thread? What are Pthreads? Why Pthreads? Designing Threaded Programs The Pthreads API Compiling Threaded Programs Thread Management Creating and Terminating Threads Passing Arguments to Threads Joining and Detaching Threads Stack Management Miscellaneous Routines Exe
defmacro - The Nature of Lisp
Introduction When I first stumbled into Lisp advocacy on various corners of the web I was already an experienced programmer. At that point I had grokked what seemed at the time a wide range of programming languages. I was proud to have the usual suspects (C++, Java, C#, etc.) on my service record and was under impression that I knew everything there is to know about programming languages. I couldn
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Parse
The most amazing feature of Parse Server is that it’s accessible for developers of all skill levels. Personally, I started playing around with Objective-C in 2012. Parse was a way for me to build a complete online app, without having the in-depth knowledge of how to build networking, storage, user systems, etc. The more I built with Parse, the more I learnt JavaScript, which has fortunately allowe
defmacro - Writing A Lisp Interpreter In Haskell
Introduction A while ago, after what now seems like eternity of flirting with Haskell articles and papers, I finally crossed the boundary between theory and practice and downloaded a Haskell compiler. I decided to do a field evaluation of the language by two means. I was going to solve a problem in a domain that Haskell is known to excel at followed by a real world problem1 that hasn't had much ex
Reimagining the Windows Command Line
08 November 2012 As of today, the prototype of Wish is available for download. If you are unfamiliar with Wish or would like an overview of the features, please see our Kickstarter project for a description and a video demonstration. Wish is the ultimate command line experience for Windows; featuring tabs, panes, syntax highlighting and improved tab completion. Download Now! Many features are curr
Fresco: a Python web micro-framework — Fresco 3.2.1.dev0 documentation
Fresco: a Python web micro-framework¶ Fresco makes writing web apps easy:¶ from fresco import FrescoApp, Response def hello(): return Response("<h1>Hello World!</h1>") app = FrescoApp() app.route('/', GET=hello) Why Fresco?¶ No restrictions on your choice of templating, database or other libraries. Simple, powerful URL routing, request and response objects. Zero dependencies. Python 3 ready. Pytho
Introducing Wakari | Continuum Analytics
We are proud to introduce Wakari, our hosted Python data analysis environment. We believe that programmers, scientists, and analysts should spend their time writing code, not working to setup a system. Data should be shareable, and analysis should be repeatable. We built Wakari to achieve these goals. Sample Use Cases We think Wakari will be useful for many people in all types of industries. He
Sorting for Humans : Natural Sort Order
12 Dec 2007 Sorting for Humans : Natural Sort Order The default sort functions in almost every programming language are poorly suited for human consumption. What do I mean by that? Well, consider the difference between sorting filenames in Windows explorer, and sorting those very same filenames via Array.Sort() code: Quite a difference. I can say without the slightest hint of exaggeration that thi
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Hyperoctahedral group - Wikipedia
Wish
GitHub - gabrielfalcao/HTTPretty: Intercept HTTP requests at the Python socket level. Fakes the whole socket module
Simple Wave Simulation with Numba and PyGame | Continuum Analytics
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