Hi,
I have three matrices which could be, for example:
A = 0, NA
NA, 3
B = 1, NA
0, NA
C = 1, NA
1, 1
(The point is that they all may have NA's in some cells)
QUESTION: How do I perform a element-by-element sum of the elements of
these three matrices (A + B + C), ignoring NA's, to obtain:
D = 2, NA
1, 4
In reality I am handling much larger matrices (not just 2x2).
Thank you for any help!
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