* NArray properties:

  + Fast and easy calculation for large numerical array.
  + Accepting Elements:
    8,16,32 bit integer, single/double float/complex, Ruby Object.
  + Easy extraction/substitution of array subset,
    using assignment with number, range, array index.
  + Operator: +,-,*,/,%,**, etc.
  + FFTW version 2 or 3 is separately supported.
  + NImage: Image viewer class.
  + Ruby/PGPLOT: Graphics library interface (separately distributed)
     X-Y Graph, Histogram, Contour map, Image map, etc.

* NArray is similar to:

  + Python/NumPy, Perl/PDL, Yorick, IDL

Homepage:
http://narray.rubyforge.org/
