Here is the MATLAB code to calculate rs:
```matlab
% Define the variables x and y
x = [1, 2, 3, 4, 5];
y = [2, 4, 6, 8, 10];
% Calculate the covariance between x and y
covariance = cov(x, y);
% Extract the covariance value
cov_value = covariance(1, 2);
%
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