Why this code gives error on line 47?

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I downloaded the code attached from the following URL of Mathworks site:
When I run it, it gives the folloing error which I don't know why?
Unrecognized function or variable 'vec'.
Error in EPUMA>pumaUpdate (line 47)
f = -vec(U(L+1:end,:));
Error in EPUMA (line 26)
DOA_Cand = pumaUpdate(U, S, L, K, maxIter);
Error in demo (line 25)
doa_estimates = EPUMA(x, K);
Star Strider
Star Strider on 30 Dec 2022
I discovered that in my search, however I wasn’t certain it was the correct function. since I had no idea what the result was supposed to be.
In any event, a version of it should have been included in the ‘EPUMA’ function files.

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Accepted Answer

Image Analyst
Image Analyst on 30 Dec 2022
Try this:
f = -U(L + 1 : end, :); % Extract rows (L+1) downwards, and all columns. f will be a 2-D matrix.
% Turn this 2-D matrix f into a column vector.
% Stack columns underneath each other, like [col1; col2; col3; col4; last column]
f = f(:);
Image Analyst
Image Analyst on 30 Dec 2022
The vote capability is for other users to say that an answer is good. Sometimes original posters just accept the first one blindly. Sometimes just because it's the first one on the list and they think they can accept multiple answers (if there were multiple ones that were right). Or sometimes they accepted too quickly (like as soon as they got the very first answer) and another one comes along shortly afterwards. They can Unaccept and accept the better one, but few people bother to do that. So the votes are for the community to say which one they think is really the best answer. Or sometimes, not the absolute best answer but just a very good answer that they think the Answerer should get credit for in terms of Reputation Points. Mathworks can extend certain perks to high earning Answerers (privileges, swag mechandise, etc.) so that's why people like to earn points.

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