Replace rows in a data frame based on criteria

Question

I have the following data frame

   id f1 f2
1  a  1  3
2  b  3  5
3  c  4  7

I would like to replace all rows which have f1>3 with a row (i

Answer 1

Something like this:

 x[x$f1 > 3,] <- data.frame('x', 0, 0)

should do the trick!

---

as per @DWin's comment, this won't work with a factor id column. Using this same technique can work like this though:

levels(x$id) <- c(levels(x$id), 'x')
x[x$f1 > 3,] <- data.frame('x', 0, 0)
droplevels(x$id)