Re: [R] merge without NA last
library(plyr)
colnames(Y)[2]<- colnames(X)
join(X,Y,type="left",by="k1")
# k1 k2
#1 A 1
#2 NA
#3 C 3
#4 B 2
A.K.
- Original Message -
From: nevil amos
To: r-help
Cc:
Sent: Friday, May 31, 2013 4:07 AM
Subject: [R] merge without NA last
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
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
The result I need is
k1 k2
1 A 1
2 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
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] merge without NA last
Le vendredi 31 mai 2013 à 18:07 +1000, nevil amos a écrit :
> 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
> 1A
> 2
> 3C
> 4B
> > 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
> 1A 1
> 2C 3
> 3B 2
> 4 NA
>
>
> The result I need is
> k1 k2
> 1A 1
> 2 NA
> 3C 3
> 4B 2
>
> how do I prevent NA c=values being sorted to last - I need to retain values
> in position.
merge(..., sort=FALSE) does not guarantee the order will be preserved,
even when NAs are not present. If you want to preserve the order, you
can add a sequence number to the original data frame:
X <- data.frame(k1=c("A",NA,"C","B"), id=seq.int(4))
and sort manually on that column after the merge.
Regards
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
