[R] help on selecting values of an object

[arun]

Hi,
You could use:
d1<- data.frame(a,b)
k1<-data.frame(a=k)
library(plyr)
join(k1,d1,by="a")[,2]
#[1] 4 4 6 6 7 7 6
A.K.




----- Original Message -----
From: Andras Farkas <motyocska at yahoo.com>
To: r-help at r-project.org
Cc: 
Sent: Thursday, July 4, 2013 2:09 PM
Subject: [R] help on selecting values of an object

Dear List,

please provide some input on the following:
we have

a <-c(0,1,2,3)
b <-c(4,5,6,7)
d <-cbind(a,b)
k <-c(0,0,2,2,3,3,2)

"k" in this case consists of some values of "d[,1]" in a random sequence. What I am trying to do is to create an object "f" that would have the values of "d[,2]" in it based on "k", and again, "k" here is a vector that consists of some values of "d[,1]". Basically I am trying to match the values in "k" with their corresponding pairs in "d[,2]". So the result should look like:

f <-c(4,4,6,6,7,7,6)

appreciate your input

Andras

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