[R] Summing list with NA elements

[Evgenia]

I have a list ( in my real problem  a double list y[[1:24]][[1:15]] but I
think the solution would be the same)

m <- matrix(1:3, 3, 3)
x <- list(m, m+3, m+6)
 and as I want to have the sum of elements I use Reduce(`+`, x)
having as result

> Reduce(`+`, x)
     [,1] [,2] [,3]
[1,]   12   12   12
[2,]   15   15   15
[3,]   18   18   18

How can I take the sum of the list elements ignoring NA element
For example if I have
x[[1]][1]<-NA

Then I want to have 
     [,1] [,2] [,3]
[1,]  11   12   12
[2,]   15   15   15
[3,]   18   18   18

instead of

> Reduce(`+`, x)
     [,1] [,2] [,3]
[1,]   NA   12   12
[2,]   15   15   15
[3,]   18   18   18

Thanks in advance

Evgenia



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