HI,
In the reply I sent, I forgot to add,
anew<-list()#before,
for(i in 1:length(b1)){
anew[[i]]<-list()
anew[[i]]<-b1[[i]]-c[[i]]
}
A.K.
----- Original Message -----
From: jimi adams <jad...@american.edu>
To: r-help@r-project.org
Cc:
Sent: Thursday, August 9, 2012 4:42 PM
Subject: [R] indexing in data frames
I'm still not fully understanding exactly how R is handling data frames, but am
getting closer. Any help with this one will likely go a long way in getting me
there. Let's say I have a data frame, let's call it "a". Within that data frame
i have two variables, let's call them "b" and "c", where "b" is a single
numeric value per observation, while "c" is a LIST of numeric values. What I
want to be able to do is perform an operation on each element in "c" by the
single element in "b".
So, for example, if I wanted to subtract each element in "c" from the scalar in
"b". For example, if i had
> a$b
[1] 1988
[2] 1989
…
&
> a$c
[[1]]
[1] 1985 1982 1984
[[2]]
[1] 1988 1980
…
I'm looking for a result of:
a$new
[[1]]
[1] 3 6 4
[[2]]
[1] 1 9
…
I've tried a few different things, none of which have the desired result. Any
help appreciated.
thanks!
jimi adams
Assistant Professor
Department of Sociology
American University
e: jad...@american.edu
w: jimiadams.com
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
