7/21/2019 Df lists

1/1

Dataframe is a list of vectors of usually different types, but of the same length.

> l = list(c(1,2,3), c("a","b","c"), c(TRUE,FALSE,TRUE))> l[[1]][1] 1 2 3

[[2]][1] "a" "b" "c"

[[3]][1] TRUE FALSE TRUE

> d = data.frame(num = c(1,2,3), label = c("a","b","c"), flag = c(TRUE, FALSE, TRUE))> d num label flag1 1 a TRUE2 2 b FALSE3 3 c TRUE

> as.list(d)

$num[1] 1 2 3

$label[1] a b cLevels: a b c

$flag[1] TRUE FALSE TRUE

> as.data.frame(l) c.1..2..3. c..a....b....c.. c.TRUE..FALSE..TRUE.1 1 a TRUE

2 2 b FALSE3 3 c TRUE

> typeof(l)[1] "list"

> typeof(d)[1] "list"