List of List in Data Frame
On Jan 31, 2011, at 8:45 PM, Gundala Viswanath wrote:
Dear sirs, I have a data that is generated like this:
dat1 <- data.frame(V1 = rep(1, 5), V2 = sample(c(40:45), 5)) dat2 <- data.frame(V1 = sample(c(0,1), 5, replace = TRUE), V2 = sample(c(40:45), 5, replace = TRUE))
What I want to do is to obtain a data frame that contain list of list.
hiv
$hiv.dat1 $hiv.dat1$V1[[1]] [1] 1 1 1 1 1 $hiv.dat1$V2[[1]] [1] 41 42 43 40 44 $hiv.dat2 $hiv.dat2$V1[[1]] [1] 0 1 1 0 0 $hiv.dat2$V2[[1]] [1] 42 43 40 44 43 But why this line of command failed to create that?
hiv <- list(hiv.dat1 = as.list(dat1), hiv.dat2 = as.list(dat2))
Especially it gives "$hiv.dat1$V1" instead of "$hiv.dat1$V1[[1]]".
But that _is_ a list of lists. Two lists, each with two sub-lists hiv$hiv.dat1$V1[[1]] is just the element "1". It is not a list.
How can we correct that? I need this particular data structure required for a specific package (ROCR).
To do what operation or procedure?
David Winsemius, MD West Hartford, CT