Verify a matrix value on MATLAB

Question

I am using MATLAB. I have a question about how i can verify that the values of a matrix are being repeating, like this:

A=[ 2 3 2 3 2 3 2 3]

If

Answer 1

I would like to throw in another approach. As I see when you are asking for "repetion" so maybe you want to have the same "pattern" repeated. For this it's easy to abuse the string functions.

A=[1,2,3,4,1,2,3,4,1,2,3]
position_repetition = strfind(A,A(1:2))

I suppose you could use regexp for more complicated pattern. Like this would check for the longest pattern that is repeated:

tmp = regexp(char(A),'(?.+)\1+','names')
group = double(tmp.group)

this should be as I understand the question - it checks if it is a repetion of the first two entries:

A=[1,2,3,4,1,2,3,4,1,2,3,4]
tmp = regexp(char(A),'^(?..)\1+$','names')
AUX = ~isempty(tmp)