Question

here is list1, only tow elements–“name” and “age” in it,there are two value in every element ,now i want to add new value in every element,

list1<-list(name=c("bob","john"),age=c(15,17))
list1
$name
[1] "bob"  "john"

$age
[1] 15 17
list1[[1]][3]<-"herry"
list1[[2]][3]<-17
list1
$name
[1] "bob"   "john"  "herry"

$age
[1] 15 17 17

is there more simple way to do ?

Answer 1

This solution works for lists of any length:

values <- list("herry", 17) # a list of the new values
list1 <- mapply(append, list1, values, SIMPLIFY = FALSE)


# $name
# [1] "bob"   "john"  "herry"

# $age
# [1] 15 17 17