Adding elements to a list in for loop in R

for-loop, list, r

Solution

It seems like you're looking for a construct like the following:

N <- 3
x <- list()
for(i in 1:N) {
    Ps <- i  ## where i is whatever your Ps is
    x[[paste0("element", i)]] <- Ps
}
x
# $element1
# [1] 1
#
# $element2
# [1] 2
#
# $element3
# [1] 3

Although, if you know `N` beforehand, then it is better practice and more efficient to allocate `x` and then fill it rather than adding to the existing list.

N <- 3
x <- vector("list", N)
for(i in 1:N) {
    Ps <- i  ## where i is whatever your Ps is
    x[[i]] <- Ps
}
setNames(x, paste0("element", 1:N))
# $element1
# [1] 1
#
# $element2
# [1] 2
#
# $element3
# [1] 3

Problem

I'm trying to add elements to a list in a for loop. How can I set the field name? ``` L <- list() for(i in 1:N) { # Create object Ps... string <- paste("element", i, sep="") L$get(string) <- Ps } ``` I want every element of the list to have the field name dependent from i (for example, the second element should have "element2") How to do this? I think that my error is the usage of `get`

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