Hi,
For example, given two 2x2 matrices m1 and m2. I would like to add/subtract
element by element
> m1
[,1] [,2]
[1,] NA NA
[2,] 1 2
> m2
[,1] [,2]
[1,] 1 NA
[2,] NA 2
> m1 + m2
[,1] [,2]
[1,] NA NA
[2,] NA 4
How can I ignore the NA, and get this ? Hope the solution can be extended to
subtract and modulo also.
[,1] [,2]
[1,] 1 NA
[2,] 1 4
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