On Aug 28, 2012, at 9:54 PM, arun wrote:
HI,
If I understand your question correctly, this should give the result:
dat1<-read.table(text="
A B C
a b a
x y z
",sep="",header=TRUE,stringsAsFactors=FALSE)
within(dat1,{new_column<-ifelse(A==C|B==C,"y","n")})
# A B C new_column
#1 a b a y
#2 x y z n
A difficulty for a newbie is that this might give the impression that
the "new_column" actually exists somewhere. If at that point one type
"dat1" at the console, you would only get three columns. You need to
do this:
dat1 <- within(dat1,{new_column<-ifelse(A==C|B==C,"y","n")})
--
David.
----- Original Message -----
From: Sapana Lohani <lohani.sap...@ymail.com>
To: R help <r-help@r-project.org>
Cc:
Sent: Tuesday, August 28, 2012 8:06 PM
Subject: [R] Use or ??
Hi, My data frame looks like
A B C
a b a
x y z
I want to add a new column which says "y" if either A or B matches
with C and "n" if there is no match. How can I do that?
Thanks
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius, MD
Alameda, CA, USA
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
