add rownames to data in fromList.R

[enriquemondragon]

A common request seems to be to work with the sets generated by the package. Adding rownames to data in the fromList.R script is a simple change that can facilitate this task, as users can know which elements are present in each set for downstream analysis.

Small example:

listInput <- list(one = c(1, 2, 3, 5, 7, 8, 11, 12, 13), 
                  two = c(1, 2, 4, 5, 10), 
                  three = c(1, 5, 6, 7, 8, 9, 10, 12, 13))

df <- fromList(listInput) 
# E.g., elements present in sets one and three, but not in two
rownames(df[df$one == 1 & df$two == 0 & df$three == 1,])
# [1] "7"  "8"  "12" "13"