[R] How would i sum the number of NA's in multiple vectors

[Carl Witthoft]

mattbju2013 wrote
> Hi guys this is my first post, i need help summing the number of NA's in a
> few vectors
> 
> for example..
> 
> c1<-c(1,2,NA,3,4)
> c2<-c(NA,1,2,3,4)
> c3<-c(NA,1,2,3,4)
> 
> how would i get a result that only sums the number of NA's in the vector?
> the.result.i.want<-c(2,0,1,0,0)

See ?is.na .   
Now, if I can interpret your question correctly, you're actually looking for
the number of NA per *position* in the vectors, so let's make them into a
matrix first.

cmat<-rbind(c1,c2,c3)
then use apply over columns
apply(cmat,2,function(k)sum(is.na(k)))





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