Using the void elements in matlab

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rahul sharma
rahul sharma 2017-1-5
回答： Sean de Wolski 2017-1-5
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.)
  2 个评论
Jos (10584)
Jos (10584) 2017-1-5
What should be the result of the computation in your example?
rahul sharma
rahul sharma 2017-1-5
It should be 2. Just compare the number of bits which are matching.

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回答（1 个）

Sean de Wolski
Sean de Wolski 2017-1-5
Use a NaN.
x = [1 nan nan 3];
sum(~isnan(x))

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