find a cell array of strings in another cell array of strings

I have two cell array of strings, say A and B. I would like to find all cells in B, in which cells of A are occurred! for example:

A={'aa';'a a';'b a'}

B={'s a';'a a';'ll';'a a';'b a';'h f'}

Here 'a a' happened twice in B, and also 'b a' happened once and 'aa' never happened. Then I would like to delete those cells, so I will have:

B={'s a';'ll';'h f'}

So, I have to consider the repetition of strings like 'a a'.

Does anyone know how to do this?

Many thanks

Answer 1

[Guillaume]

ismember is the function that tells you if elements of a set are found in another set.

A = {'aa'; 'a a'; 'b a'}
B = {'s a'; 'a a'; 'll'; 'a a'; 'b a'; 'h f'}
%find which cells of A are in B
isAinB = ismember(A, B);
fprintf('''%s'' of A was found in B\n', A{isAinB});
%find which cells of B are in A and delete them
isBinA = ismember(B, A);
B(isBinA) = []

Answer 2

[Jos (10584)]

So you want the keep the elements in B that are not in A. This is known is the difference in sets, implemented in matlab like this

A = {'aa' ; 'a a' ; 'b a'}
B = {'s a' ; 'a a' ; 'll' ; 'a a' ; 'b a' ; 'h f'}
OUT = setdiff(B,A)

[sh as]

Thank you very much for quick reply.

But the problem is that this function also does something like unique function. that it also remove any repetition of other strings in B that are important for me to keep them.

[Guillaume]

Then use ismember as per my answer.