Indexing and turning into column vector

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AES
AES 2023-7-23
编辑： James Tursa 2023-7-23
Is there a quick way to index into an array and then make it a column vector without reshaping? See below for example:
a = ones(5, 4, 3, 2)
%Works
aR = reshape(a(:, :, :, 2), 1, [])
%Any alternatives?
%a(:, :, :, 2)(:), etc
Thanks in advance

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James Tursa
James Tursa 2023-7-23
编辑：James Tursa 2023-7-23
Not really. It's going to be a two-step process no matter how you do it (without resorting to a mex routine, which isn't worth it IMO). The indexing you do above is a deep data copy, but the reshape is very quick and is not a deep copy, so I wouldn't worry about it. Just do what you are currently doing. Note that if you want a column vector output you should be doing reshape(a(:, :, :, 2), [], 1).

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