>> barcode = [8 9 0 2 0 8 0 0 1 1 4 4 5];
>> n = polyval(barcode,10)
n =
8902080011445
Or, without polyval:
>> n = sum(barcode .* 10.^[(numel(barcode)-1):-1:0])
n =
8902080011445
Note that this assumes all elements of barcode are single-digit. If this is not the case, but you want something similar, this would work:
>> barcode = [8 9 0 2 0 8 0 0 1 1 4 86 5];
>> n = str2num(regexprep(num2str(barcode),' ',''))
n =
89020800114865
