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

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Srh Fwl
Srh Fwl 2020-7-21
评论： Srh Fwl 2020-7-21
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.

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采纳的回答

madhan ravi
madhan ravi 2020-7-21
matrix(matrix == 0) = nan
nanmean(matrix, 2)
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Srh Fwl
Srh Fwl 2020-7-21
Thank you, @madhan ravi. I found that I couldn't use "nanmean" because I don't have the statistics toolbox. However, I found an alternative and it works with the first part of your suggestion. Really appreciate it.
A = [3; 4; 5; 0]
B = [7; 8; 9; 10]
C = [A(:), B(:)]
C(C == 0) = nan
D = mean(C,2,'omitnan')

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