Convert row names into first column

Question

I have a data frame like this:

df
              VALUE              ABS_CALL DETECTION P-VALUE    
    1007_s_at "957.729231881542" "P"      "0.00486279317241156"
    1053_at   "320.632701283368" "P"      "0.0313356324173416" 
    117_at    "429.842323161046" "P"      "0.0170004527476119" 
    121_at    "2395.7364289242"  "P"      "0.0114473584876183" 
    1255_g_at "116.493632746934" "A"      "0.39799368200131"   
    1294_at   "739.927122116896" "A"      "0.0668649772942343" 

I want to convert the row names into the first column. Currently I use something like this to make row names as the first column:

  d <- df
  names <- rownames(d)
  rownames(d) <- NULL
  data <- cbind(names,d)

Is there a single line to do this?

Answer 1

Or you can use dplyr's add_rownames which does the same thing as David's answer:

library(dplyr)
df <- tibble::rownames_to_column(df, "VALUE")

UPDATE (mid-2016): (incorporated to the above)

old function called add_rownames() has been deprecated and is being replaced by tibble::rownames_to_column() (same functions, but Hadley refactored dplyr a bit).