How to append an element to an array in MATLAB?

Question

I wish to append my elem to the end of an array A.

What should I do?

@Guddu huhhuh, this was once a funny slip of the tongue during a presentation. *facepalm* — Sibbs Gambling, Jan 19 '14 at 02:00
This is [so duplicated](https://www.google.com/search?client=safari&rls=en&q=matlab+append+stackoverflow&ie=UTF-8&oe=UTF-8) that I don't know where to begin. Do you have a more specific question because I'm sure that you must have searched first. — horchler, Jan 19 '14 at 02:18

herohuyongtao · Accepted Answer · 2014-01-19T03:12:13.383

22

Use the following

A = [A elem] % for row array

or

A = [A; elem] % for col array

Edit: Another simpler way is (as @BenVoigt suggested) to use end keyword

A(end+1) = elem;

which works for both row and column vectors.

edited Jan 19 '14 at 03:12

answered Jan 19 '14 at 01:54

herohuyongtao

Do I need to declare it first? like `A = {}` – Sibbs Gambling Jan 19 '14 at 02:02
@FarticlePilter No, you don't. – herohuyongtao Jan 19 '14 at 02:04
`a = [1 2 3]; a = [A 4];` – Guddu Jan 19 '14 at 02:05
a = [1 2 3]; a = [a 4]; – herohuyongtao Jan 19 '14 at 02:06
Hi, I was trying to add elements to the end of array inside a loop, but for some reason it won't work. cols = []; for iu = 1:length(id_unique) [~,col] = find(faces(:,:)== iu); cols(end+1) = col; end Do you see a problem in here? – June Wang Dec 15 '19 at 02:53

score 12 · Answer 2 · answered Jan 19 '14 at 02:55

12

Another way is

A(end+1) = elem;

which works for both row and column vectors.

answered Jan 19 '14 at 02:55

Ben Voigt

Of course, you have to compute "end" first. Good point though. – herohuyongtao Jan 19 '14 at 03:00
4

@herohuyongtao: No, `end` is the MATLAB keyword. – Ben Voigt Jan 19 '14 at 03:01

2 Answers2