Assume $y$ is a $($row$)$ vector with $N$ elements $($from $y_{-}1$ to $y_{-}N).$ Express the following summation using a Matlab command, creating the variable a$.$ Do not use a loop in your solution.

$a={\displaystyle \underset{k=2}{\overset{N-1}{}}}\frac{3y_{k-1}-y_k^2+sin(y_{k+1})}{3}$

Script $o.$

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$\%$ Create a vector of random numbers $rng(5)$;$y=$rand$(1,1000)$;

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Assessment:

Correct value of a$?$