Add elements of array A to array B and ensure there is no repeated element in B?

Hi all,

If I have arrays A and B, and I'd like to add elements of array A into array B, during this process, B is actively checked to ensure there is no repeated elements in B, how can I do it?

Many thanks!

[jonas]

Can you provide example of A and B with the desired output?

[Xiaohan Du]

For example:

A = [2 3 4]; % before adding
B = [5 4 3 1 3]; % add B to A, has to be an iterative check 
% because in my code elements of B is generated iteratively, 
% not all at once. 

A_output = [2 3 4 5 1]; % after adding, no repeated element

Answer 1

[KSSV]

A = rand(10,1) ;
B = rand(10,1) ;
%%check for B
[C,ia,ib] = unique(B) ;
if length(C)==length(B)
    fprintf('B has no repeated elements\n') ;
    R = A+C ;
else
    fprintf('B has repeated elements\n') ;
end

[Xiaohan Du]

I meant when adding elements of B into A, check if A has repeated elements. But anyway, this allows to find out if A has repeated elements.

So now there is the problem: if there is repeated element in A, how to remove it and continue to move and check?

Answer 2

[Guillaume]

B = unique([B, A]);   %assuming B and A are row vectors.

If you want to preserve the original ordering of elements:

B = unique([B, A], 'stable');