[R] Simple but elusive - expand back from counts

[jjap]

Dear R-users,

This should be simple but still eludes me:

Given the following
tmp<-as.data.frame(matrix(c(44, 10, "abc", 1, 44, 10, "def", 1, 44, 12,
"abc", 2), 3, 4, byrow=T))

I want to  expand the data to the following form:

  V1 V2  V3 V4
1 44 10 abc  1
2 44 10 def  1
3 44 12 abc  1
4 44 12 abc  1

The last row of the original df was duplicated the row by the number in the
4th column (which could be expendable being all ones)
I clumsily tried a few variants of a loop but I am not making any progress.
Any hints would be greatly appreciated.
for (i in 1:3){
  rbind(rep(tmp[i,], temp[i,4])
  }

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