Tutorial-on-R/List.r at master · kimalaacer/Tutorial-on-R · GitHub

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list1<-list(1,2,3)

list1

list2<-list(c(1,2,3))

list2

list3<-list(c(1,2,3), 3:7)

list3

theDF<-data.frame(First=1:5, Second=5:1, Sport=c('Hockey', 'Lacrosse', 'Football', 'Curling', 'Tennis'), stringsAsFactors=FALSE)
theDF
list4 <- list(theDF, 1:10)
list4


list5 <- list(theDF, 1:10, list3)
list5
names(list5)
names(list5) <- c('data.frame', 'vector', 'list')

names(list5)
list5
list6 <- list(TheDataFrame=theDF, TheVector=1:10, TheList=list3)
list6
names(list6)
emptyList <- vector(mode = 'list',length = 4)
emptyList
emptyList[[1]] <- 5
emptyList
list5[[1]]
names(list5)
list5[['data.frame']]

list5[[1]]$Sport
  #returns as a vector after $sign: we are specifying the sport column from the data.frame

#similarly we can use brackets:

list5[[1]][,'Second']
#returns as a vector.
list5[[1]][,'Second', drop = FALSE]
#returns as a data frame

length(list5)

list5[[4]] <- 2

list5

list5[['NewElement']] <- 3:6
length(list5)
names(list5)