# File lib/linalg/dmatrix/main.rb, line 135
      def inspect2
         res = "#{self.class}["
         vsize.times { |i|
            res << "["
            hsize.times { |j|
               res << self[i,j].to_s << ","
            }
            res.chop!
            res << "],"
         }
         res.chop!
         res << "]"
      end