# [R] R Beginner : Loop and adding row to dataframe

arun smartpink111 at yahoo.com
Sun Jul 22 22:42:53 CEST 2012

```Hi,

Try this:

dat1<-read.table(text="
NACE aaa bbb ccc
1 a a c
1 a a c
1 a a c
2 a a c
2 a a c
3 a a c
4 a a c
4 a a c
4 a a c
",sep="",header=TRUE)
dat2<-read.table(text="
Name NACE
a 1
b 2
c 3
",sep="",header=TRUE)

dat3<-merge(dat1,dat2)
dat3<-dat3[,1:4]
dat3
NACE aaa bbb ccc
1    1   a   a   c
2    1   a   a   c
3    1   a   a   c
4    2   a   a   c
5    2   a   a   c
6    3   a   a   c
A.K.

----- Original Message -----
From: ph!l <firestorm1 at hotmail.com>
To: r-help at r-project.org
Cc:
Sent: Sunday, July 22, 2012 12:35 PM
Subject: [R] R Beginner : Loop and adding row to dataframe

Hi everybody,

I am currently quite inexperienced with R.
I try to create a function that simply take a value in a dataframe, look for
this value in another dataframe and copy all the row that have this value
This example is a simplified version of what I am doing but it's enough to
help me

listA
Name NACE
a 1
b 2
c 3

ListB
NACE aaa bbb ccc
1 a a c
1 a a c
1 a a c
2 a a c
2 a a c
3 a a c
4 a a c
4 a a c
4 a a c

The output i would like to have
NACE aaa bbb ccc
1 a a c
1 a a c
1 a a c
2 a a c
2 a a c
3 a a c

Code:

listpeer <- function (x) {
for (i in 1:length(listA\$NACE))
TriNACE[i] <- subset.data.frame(ListB, NACE == NACEsample\$NACE[i],)
TriNACE
}

But the result is
Warning message:
In `[<-.data.frame`(`*tmp*`, i, value = list(NACE = c(3L, 3L, 3L :
provided xx variables to replace x variables"
I guess there is something wrong "TriNACE[i]", instead i should use
something to add rows, but I really don't find anything ?
Somebody has any clue ?

Thank you for your time and help!

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