Indexing and turning into column vector

1 Ansicht (letzte 30 Tage)
AES
AES am 23 Jul. 2023
Bearbeitet: James Tursa am 23 Jul. 2023
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

Akzeptierte Antwort

James Tursa
James Tursa am 23 Jul. 2023
Bearbeitet: James Tursa am 23 Jul. 2023
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).

Weitere Antworten (0)

Kategorien

Mehr zu Matrix Indexing finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by