--- Vector#[]=(i,x)
    iܤǤxѹ롣

Υ᥽åɤϡmatrix.rbƤʤ
ʲˡȻ򼨤

    require 'matrix'

    class Vector
      def []=(i,x)
        @elements[i]=x
      end
    end

    v=Vector[1,2,3]
    v[2]=-1
    p v #=> Vector[1,2,-1]

