# File lib/modai_prct12/matrizDensa.rb, line 50
        def +(o)
        
                if o.instance_of? MatrizDispersa
                        other = to_densa(o)
                else
                        other = o
                end
                
                suma = Array.new(matriz.size - 1)

                0.upto(matriz.size - 1) do |i|
                      suma[i] = Array.new(matriz[i].size - 1)

#                       0.upto(matriz[i].size - 1) do |j|
                        
                        j = 0
                        (0...(matriz[i].size)).collect {

                                suma[i][j] = matriz[i][j] + other.matriz[i][j]
                                j += 1

                        }

#                       end

                end
                MatrizDensa.new(suma)

        end