Convert data frame into vector

Question

I have a one row/column dataframe that I would like to convert into a value.

df <- data.table(x=c(300))
>#     x
># 1: 300

I've managed to do it by doing this:

b <- as.list(df)[[1]]
># [1] 300

so that identical(b, 300) == T

Is there a simpler way to achieve this? I understand this is a very simple question but I couldn't find a solution. Help?

Answer 1

基本上，数据帧是列表，因此您可以调用unlist(df) 。

Answer 2

Instead of using unlist , you can also simply do:

x <- df$x

the result is a normal vector with the values from x :

> x
[1] 300