Remove rows from a single-column data frame

Question

When I try to remove the last row from a single column data frame, I get a vector back instead of a data frame:

> df = data.frame(a=1:10)
> df
    a
1          


        

Answer 1

Try adding the drop = FALSE option:

R> df[-(length(df[,1])), , drop = FALSE]
  a
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9