matlab - Fastest way of finding repeated values in different cell arrays of different size

Question

The problem is the following:

I have a cell array of the form indx{jj} where each jj is an array of 1xNjj, meaning they all have different size. In my case max(jj)==3, but lets consider a general case for the shake of it.

How would you find the value(s) repeated in all the jj i the fastest way?

I can guess how to do it with several for loops, but is there a "one (three?) liner"?

Simple example:

indx{1}=[ 1 3 5 7 9];
indx{2}=[ 2 3 4 1];
indx{3}=[ 1 2 5 3 3 5 4];


ans=[1 3];

Answer 1

One possibility is to use a for loop with intersect:

result = indx{1}; %// will be changed
for n = 2:numel(indx)
    result = intersect(result, indx{n});
end