R Beginner : Loop and adding row to dataframe

tmp <- merge(listA, listB, by = "NACE")
tmp[,-2]

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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