Given the code:
A = randi([18 22], 20,1)
B = randi([15 25], 20,1)
C = cov(A,B)
This is the outcome that you'll get:
>> C
C =
1.6947 -0.2842
-0.2842 6.8842
The same data in excel produces the following:
So you get the same values. Read up the documentation for covariance. This is why you get a matrix of the results:
