I am trying to create a merge where the first value contains NA values. I
wish to retain these in order. however when I use all.x=T and sort=F they
are retained but na values are placed last:
> X<-data.frame(k1=c("A",NA,"C","B"))
> print (X)
k1
1 A
2 <NA>
3 C
4 B
> Y<-data.frame(k2=c(1,2,3),k3=c("A","B","C"))
> Z<-merge(X,Y, by.x=1,by.y=2,all.x=T,sort=F)
> print (Z)
k1 k2
1 A 1
2 C 3
3 B 2
4 <NA> NA
The result I need is
k1 k2
1 A 1
2 <NA> NA
3 C 3
4 B 2
how do I prevent NA c=values being sorted to last - I need to retain values
in position.
thanks
Nevil Amos
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