# add_row ---------------------------------
df <- data_frame(x = 1:3, y = 3:1)
add_row(df, x = 4, y = 0)
# You can supply vectors, to add multiple rows (this isn't
# recommended because it's a bit hard to read)
add_row(df, x = 4:5, y = 0:-1)
# Absent variables get missing values
add_row(df, x = 4)
# You can't create new variables
add_row(df, z = 10)
Run the code above in your browser using DataLab