making column vector from the rows of a data frame

Question

I have a data frame with 12 columns and Five Rows. I need to convert this into a column vector with each row being successively pasted one below other.

For example 1 2 3 A abc B def C ghi I need the final output as A1 abcdefghi

Answer 1

我们可以转置数据集，将其连接到vector并创建单个列data.frame

out <- data.frame(col1 = c(t(df1)))

Answer 2

If you want the rownames to be which column it comes from try,

data.frame(all = unlist(mtcars))
#                   all
# mpg1           21.000
# mpg2           21.000
# mpg3           22.800
# mpg4           21.400
# mpg5           18.700
# mpg6           18.100