MATLAB: How to find the indices of element occuring once in a vector

Question

Hello all

I want to know…How can I get the indices of a value that is occuring only once in a vector…please guide.

Example: A=[1 1 0 -1 0 0 1 0 1 1]

Task: To identify the indices of -1 (as it is occuring only once) in A.

Please Help!!!

Regards

Answer 1

There are ways to solve your problem based on HISTC or ACCUMARRAY. However, the simplest approach if you really have only two situations (unique 1 or unique -1) is probably the following:

 if sum( A == 1 ) == 1
    pos = find( A == 1 ) ;
 else
    pos = find( A == -1 ) ;
 end
 value = A(pos) ;