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rtopitt : gnu   5

why GNU grep is fast
Here's a quick summary of where GNU grep gets
its speed. #1 trick: GNU grep is fast because it AVOIDS LOOKING AT
EVERY INPUT BYTE. #2 trick: GNU grep is fast because it EXECUTES VERY FEW INSTRUCTIONS FOR EACH BYTE that it *does* look at.
grep  gnu  linux  performance  unix  busca  string  algorithm  programming 
august 2010 by rtopitt
Fitting curves to data using Ruby and the GNU Scientific Library
If you need to perform data analysis, provide graphics for your users in your webapp, or produce high quality plots I encourage you to investigate the combination of ruby, GSL and GNUPlot.
ruby  gnu  gráfico  gnuplot  estatística  visualização  dados  gsl  curva  previsão  programming 
november 2009 by rtopitt
RubyGSL is a ruby interface to the GSL (GNU Scientific Library), for numerical computing with Ruby.
ruby  gnu  gem  biblioteca  estatística  matemática  gsl  interface  programming 
november 2009 by rtopitt
Implementing the Pearson correlation algorithm using Ruby and the GNU Scientific Library
At its heart, acts_as_recommendable uses a statistical measure known as the Pearson correlation coefficient to calculate the “nearness” of items to one another. Alex talked about the performance issues he encountered when implementing the algorithm in pure ruby. To allow recommendations to be calculated for the entire database he had to switch to making calculations offline and reimplementing the algorithm in C using RubyInline .
ruby  rails  plugin  performance  c  gnu  estatística  algorithm  programming  recomendation 
november 2009 by rtopitt
Nexenta OS - Nexenta GNU/OpenSolaris
Sistema que usa os pacotes do Ubuntu com o kernel do OpenSolaris
geek  gnu  linux  open_solaris  ubuntu 
may 2009 by rtopitt

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