mdarray (rubygems): "MDArray is a multi dimensional array implemented for JRuby inspired by NumPy (www.numpy.org) and  Masahiro Tanaka´s Narray (narray.rubyforge.org).  MDArray stands on the shoulders of Java-NetCDF  and Parallel Colt.  At this point MDArray has libraries for linear algebra, mathematical,  trigonometric and descriptive statistics methods.  NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of  scientific data formats.  It is developed and distributed by Unidata (http://www.unidata.ucar.edu).   Parallel Colt (http://grepcode.com/snapshot/repo1.maven.org/maven2/net.sourceforge.parallelcolt/ parallelcolt/0.10.0/) is a multithreaded version of Colt (http://acs.lbl.gov/software/colt/).   Colt provides a set of Open Source Libraries for High Performance Scientific and Technical  Computing in Java. Scientific and technical computing is characterized by demanding problem  sizes and a need for high performance at reasonably small memory footprint."  For more information and (some) documentation please go to: https://github.com/rbotafogo/mdarray/wiki 
Keywords: colt|jruby|linear-algebra|matrix|mdarray|multidimensional-arrays|ruby|rubydatascience