MATLAB: Common Non-Zero Elements Among 5 Arrays

Question

I have five 3-D arrays and I would like to find any elements that are common to 2 or more of the arrays and that are non-zero. I've tried doing something like:

mask = (dat1==dat2) | (dat1 == dat3) | (dat1 == dat4) | (dat1 == dat5) | (dat2 == dat3) | (dat2 == dat4) | (dat2 == dat5) | (dat3 == dat4) | (dat3 == dat5) | (dat4 == dat5);

but since zeros are common, I get an array of nearly all 1's. I'm trying to avoid just using a 'for' loop to step through all the non-zero elements and checking. There should only be about 50 or so common non-zero elements out of nearly 100,000 total elements.

Thank you for your time helping me.

EDIT: What I want to know is the location of the elements and I don't really care what the value is (as long as it isn't zero).

Answer 1

I am still a uncertain if this is what you want, but here goes:

idx0 = (dat1==dat2 | dat1==dat3 | dat1==dat4 | dat1==dat5) & logical(dat1);
idx1 = (dat1==dat2 | dat2==dat3 | dat2==dat4 | dat2==dat5) & logical(dat2);
idx2 = (dat1==dat3 | dat2==dat3 | dat3==dat4 | dat3==dat5) & logical(dat3);
idx3 = (dat1==dat4 | dat2==dat4 | dat3==dat4 | dat4==dat5) & logical(dat4);
idx4 = (dat1==dat5 | dat2==dat5 | dat3==dat5 | dat4==dat5) & logical(dat5);
IDX = idx0 | idx1 | idx2 | idx3 | idx4

Now IDX has a 1 where two or more arrays share a non-zero value...