# File lib/Matriz.rb, line 38
def comprobar()
   cont_total = 0
   cont_ceros = 0
   @filas.times do |i|                  
      @cols.times do |j|                        
         if @matriz[i][j] == 0
            cont_ceros = cont_ceros + 1
         end
         cont_total = cont_total + 1
      end
   end
   if cont_ceros >= (cont_total * 0.6)
      Matriz_dispersa.new(@matriz)
   else
      Matriz_densa.new(@matriz)
   end
end