Keep in mind that your test suite isn't hidden in Cody. For that reason, Cody isn't the best place to ask questions that have a single correct answer (i.e. the answer doesn't change depending on novel inputs).
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Compute a dot product of two vectors x and y
Switch matrix to a column vector
Matlab Basics - Convert a row vector to a column vector
multiply by three
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