# How to do some calculations on nonzero nonNAN elements of an array

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Zeynab Mousavikhamene on 2 Dec 2019
Commented: Tiago Dias on 3 Dec 2019
I have an array of about 400*20 size and some of its members are NAN or zero. There is a second array of the same size which I need to divide the first array by corrsponding member of the second array: FirstArrayName./SecondArrayName
how can I exclude non zero non NAN elements from this calculation?

Stephan on 2 Dec 2019
What should be the result on the NaN - positions of the resulting matrix?
KALYAN ACHARJYA on 2 Dec 2019
how can I exclude non zero non NAN elements from this calculation?
Are you want exclude zero or NaN or both?
There is no impact, if you divide directly without excluding the NaN and zero elements. NaN position reflects the NaN again and zero reflects the same zero, in addition you can suppress those elements in the result array also.
Zeynab Mousavikhamene on 2 Dec 2019
For some reason, I need to divide the members that are nonzero and are not NAN.

Tiago Dias on 2 Dec 2019
Hello, is this what u want to do?
A = [1 NaN 2 NaN;3 1 4 5]
result = A(1,:) ./ A(2,:)
result =
0.3333 NaN 0.5000 NaN