Rearrange rows in data frame

Question

I have a data frame in R which looks like this with two columns:

ID     phone_number
Mark     866458
Paul     986564
Jack     987543
Mary     523422
<         


        

Answer 1

We can transpose the dataframe and then create one vector of values

data.frame(new_col = c(t(df)))

#  new_col
#1    Mark
#2  866458
#3    Paul
#4  986564
#5    Jack
#6  987543
#7    Mary
#8  523422

---

Another base R option using mapply

data.frame(new_col = c(mapply(c, df$ID, df$phone_number)))