# File lib/rongo.rb, line 149
  def limits(*xyval)
    if xyval.size < 4
      if xyval.size > 0 
        print "limit: only #{xyval.size} args specified, all ignored \n"
      end
      xyval[0]=@@coldata[0].min
      xyval[1]=@@coldata[0].max
      xyval[2]=@@coldata[1].min
      xyval[3]=@@coldata[1].max
    end
    @@limitval[0..3] = xyval
  end