Using the void elements in matlab

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I am multiplying an array, say A= [1 0 1 0 0] with another array B=[1 _ _ 0 _]. Now I want to compare only certain bits of B with A not all the values. So, I was thinking of taking 'void values' at 2nd, 3rd and 5th places of B which will have no role to play at all. Is there any type of data type that can be used for such purposes. (Note: I have taken A and B to be quite small so that I can explain my problem. I have both the array of size in 4000's and I have to perform convolution so I have to shift one array all the time. So, I don't think it's good idea to compare the two array only for the places that I want. The better way I thought is to insert these 'null' values which plays no role in computation at all.)