What does your code look like so far? You can make a table like this:
T = table(var1,var2,var3,var4, 'VariableNames', {'col1name','col2name','col3name','col4name'});
where var1, var2, var3, and var4 are your four column vectors (each of which should have 21 rows).
For example,
>> T = table((1:10)',('a':'j')', 'VariableNames', {'numbers', 'letters'})
T =
10×2 table
numbers letters
_______ _______
1 a
2 b
3 c
4 d
5 e
6 f
7 g
8 h
9 i
10 j
