* 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