You haven't shown us the size of your table, which would be helpful given the error message you are getting. My suspicion is that, in MATLAB, your table does not have 3843 rows. Based on your indexing, and the fact you used readtable, I suspect if you use 1:3842, your code will work. If that is the case, then you can just use a colon instead to indicate all rows.
f{:,8:11};
f{:,4:7};
