> i want to read all column "A"
> all column A if there are any values
> [NUMARR, TXTARR, RAWARR, LIMITS] = xlsread (percorsoNomeFile,'A1:A20')
> here i read column until A20..but i don't want this
> i want to read infinite cell
Just specify the max admissible row nr in the range
('A1:A<verylargenumber>'). You can find on the web what that max nr
(<verylargenumber>) is for specific spreadsheet file types. IIRC for .xlsx
it's about 10^6 but better check that out yourself.