duplicate rows in a data frame in R

Question

I am trying to duplicate rows in my data frame using the code below. However, I'm finding it to be slow.

duprow = df[1,]
for(i in 1:2000)
{
    print(i)
    df = rbind(df,duprow)
}

Is there a faster way?

Answer 1

You can use rep, e.g. for 5 duplicates or row 1:

df <- data.frame(x = 1, y = 1)
rbind(df, df[rep(1, 5), ])
#     x y
# 1   1 1
# 11  1 1
# 1.1 1 1
# 1.2 1 1
# 1.3 1 1
# 1.4 1 1