[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 1A 2 NA 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 NA The result I need is k1 k2 1A 1 2 NA NA 3C 3 4B 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.
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 NA 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 NA The result I need is k1 k2 1A 1 2 NA 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.
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 NA #3 C 3 #4 B 2 A.K. - Original Message - From: nevil amos nevil.a...@gmail.com To: r-help R-help@r-project.org 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 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 [[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.
