Extmath is a library that extends Ruby's built-in math library. This gem reflects the current version (2.3.0) of the extmath library originally written by Josef Schugt.

Using this package, you can do powerful pattern recognition easily from your shell command line using a simple suite of tools. Applications include music cateogrization, text classification, handwritten digit recognition, and evolutionary tree reconstruction. The technique is based on a very general theoretical notion of Kolmogorov Complexity, and so is undoubtedly applicable to many as yet unknown disciplines. See the webpage for research papers explaining the math behind these techniques.

Ritex converts expressions from WebTeX into MathML. WebTeX is an adaptation of TeX math syntax for web display. Ritex makes inserting math into HTML pages easy. It supports most TeX math syntax as well as macros.

Color is a Ruby library to provide basic RGB, CMYK, HSL, and other colourspace manipulation support to applications that require it. It also provides 152 named RGB colours (184 with spelling variations) that are commonly supported in HTML, SVG, and X11 applications. A technique for generating monochromatic contrasting palettes is also included. The Color library performs purely mathematical manipulation of the colours based on colour theory without reference to colour profiles (such as sRGB or Adobe RGB). For most purposes, when working with RGB and HSL colour spaces, this won't matter. Absolute colour spaces (like CIE L*a*b* and XYZ) and cannot be reliably converted to relative colour spaces (like RGB) without colour profiles. Color 1.8 adds an alpha parameter to all <tt>#css_rgba</tt> calls, fixes a bug exposed by new constant lookup semantics in Ruby 2, and ensures that <tt>Color.equivalent?</tt> can only be called on Color instances. Barring bugs introduced in this release, this (really) is the last version of color that supports Ruby 1.8, so make sure that your gem specification is set properly (to <tt>~> 1.8</tt>) if that matters for your application. This version will no longer be supported one year after the release of color 2.0.

Provides classes and methods to perform unit math and conversions

Eymiha basic math extensions

Emiyha - basic 3D math extensions

== DESCRIPTION: Charlie is a library for genetic algorithms (GA) and genetic programming (GP). == FEATURES: - Quickly develop GAs by combining several parts (genotype, selection, crossover, mutation) provided by the library. - Sensible defaults are provided with any genotype, so often you only need to define a fitness function. - Easily replace any of the parts by your own code. - Test different strategies in GA, and generate reports comparing them. Example report: http://charlie.rubyforge.org/example_report.html == INSTALL: * sudo gem install charlie == EXAMPLES: This example solves a TSP problem (also quiz #142): N=5 CITIES = (0...N).map{|i| (0...N).map{|j| [i,j] } }.inject{|a,b|a+b} class TSP < PermutationGenotype(CITIES.size) def fitness d=0 (genes + [genes[0]]).each_cons(2){|a,b| a,b=CITIES[a],CITIES[b] d += Math.sqrt( (a[0]-b[0])**2 + (a[1]-b[1])**2 ) } -d # lower distance -> higher fitness. end use EdgeRecombinationCrossover, InversionMutator end Population.new(TSP,20).evolve_on_console(50) This example finds a polynomial which approximates cos(x) class Cos < TreeGenotype([proc{3*rand-1.5},:x], [:-@], [:+,:*,:-]) def fitness -[0,0.33,0.66,1].map{|x| (eval_genes(:x=>x) - Math.cos(x)).abs }.max end use TournamentSelection(4) end Population.new(Cos).evolve_on_console(500)

== DESCRIPTION: Stops spam with a math test == FEATURES/PROBLEMS: stops spam by adding a simple math questions to a form

iPhone friendly sinatra web UI for God

Mathstats is a basic statistics library. It is meant to be mixed into Array, but you can also use it as a standalone class.

Arbitrary precision mathematics with application to real and complex linear algebra, graphical representation of functions, and 2D Kepler motion

ULMUL is an original Ultra Lightweight MarkUp Language. You can write TeX-style equations in ULMUL texts. The ULMUL texts can be converted into HTML5+MathML with ulmul2html5 command, into HTML5+MathJax with ulmul2mathjax and into LaTeX with ulmul2latex. You can also generate Slidy presentations. Its library ulmul.rb is written in Ruby.

RDocF95 is an improved RDoc for generation of documents of Fortran 90/95 programs. Differences to the original one are given below. <b>Enhancement of "parser/f95.rb"</b> :: The Fortran 90/95 parse script "parser/f95.rb" (In rdoc-f95, old name "parsers/parse_f95.rb" is used yet) is modified in order to parse almost all entities of the Fortran 90/95 Standard. <b>Addition of <tt>--ignore-case</tt> option </b> :: In the Fortran 90/95 Standard, upper case letters are not distinguished from lower case letters, although original RDoc produces case-dependently cross-references of Class and Methods. When this options is specified, upper cases are not distinguished from lower cases. <b>Cross-reference of file names</b> :: Cross-reference of file names is available as well as modules, subroutines, and so on. <b>Modification of <tt>--style</tt> option</b> :: Original RDoc can not treat relative path stylesheet. Application of this patch modifies this function. <b>Conversion of TeX formula into MathML</b>:: TeX formula can be converted into MathML format with --mathml option, if <b>MathML library for Ruby version 0.6b -- 0.8</b> is installed. This library is available from {Bottega of Hiraku (only JAPANESE)}[http://www.hinet.mydns.jp/~hiraku/]. See {RDocF95::Markup::ToXHtmlTexParser}[link:classes/RDocF95/Markup/ToXHtmlTexParser.html] about format. <b>*** Caution ***</b> Documents generated with "--mathml" option are not displayed correctly according to browser and/or its setting. We have been confirmed that documents generated with "--mathml" option are displayed correctly with {Mozilla Firefox}[http://www.mozilla.org/products/firefox/] and Internet Explorer (+ {MathPlayer}[http://www.dessci.com/en/products/mathplayer/]). See {MathML Software - Browsers}[http://www.w3.org/Math/Software/mathml_software_cat_browsers.html] for other browsers. Some formats of comments in HTML document are changed to improve the analysis features. See {parse_f95.rb}[link:files/lib/rdoc-f95/parsers/parse_f95_rb.html]

A simple ruby gem for encoding and decoding strings using the Solitaire Cipher.

The SuperMemo algorithm (version SM-2) in ruby

Mathematical expression evaluator for infix notation

Mathematical expression evaluator

Standard rails extentions I find quite handy time to time

The capabilities of the Color library are limited to pure mathematical manipulation of the colours based on colour theory without reference to colour profiles (such as sRGB or Adobe RGB). For most purposes, when working with the RGB and HSL colours, this won't matter. However, some colour models (like CIE L*a*b*) are not supported because Color does not yet support colour profiles, giving no meaningful way to convert colours in absolute colour spaces (like L*a*b*, XYZ) to non-absolute colour spaces (like RGB).