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jruby_array_math.rb #
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require 'java'
require 'jmatharray.jar'
 
id = org.math.array.LinearAlgebra.identity(4)
 
ruby_arr = [[0.25, 0.25, 0.25, 0.25],
            [0.25, 0.25, 0.25, 0.25],
            [0.25, 0.25, 0.25, 0.25],
            [0.25, 0.25, 0.25, 0.25]]
 
java_arr = ruby_arr.to_java Java::double[]
 
result = org.math.array.LinearAlgebra.plus( java_arr, id )
 
result.each do |row|
  puts row.collect{|i| i.to_s}.join(", ")
end