MATLAB: For elements in two arrays/columns of numbers, how can I find the average only if both elements are non-zero

arrayscell arraysfor loopmatrixmatrix arraymatrix manipulation

I have many external files. Each file contains two long columns of numbers, like this:
1        2
11       12
6        48
9        0.0
3        0.5
I can read each file in. Now I want to calculate the average of each row. In the column of results, for example, the elements would be: 
(1 + 2 / 2) 
(11 + 12 / 2)
(6 + 48 / 2) ...
The problem is, I don't want to take the average of rows where one element is zero. For example, I want the row that has
9        0.0
to be "9." Does anyone know how I can do, "calculate the average of each row, but leave the row alone if one element is zero?" I'm using 2016a. Thank you for any advice.

Best Answer

matrix(matrix == 0) = nan
nanmean(matrix, 2)
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