Suppose my Environment contains the following objects (dummy names):
abcd # numeric
efgh # dataframe
ijkl # matrix
mnop # character
My goal : Put them in a list automatically, without typing:
mylist<-list(abcd,efgh,ijkl,mnop)
Is there a function that can do this? More precisely, it would be the opposite of the list2env function.
Here's a way to solve the problem.
First I'll create an Environment with the objects described in the question.
set.seed(1234)
e <- new.env()
e$abcd <- rnorm(10)
e$efgh <- data.frame(A = letters[1:5], X = runif(5))
e$ijkl <- matrix(1:24, ncol = 3)
e$mnop <- sample(LETTERS, 10)
Now, get the objects of environment e with the function ls and then create the list of those objects with mget .
obj <- ls(envir = e)
lista <- mget(obj, envir = e)
lista
In addition to the ls() function, you need the function get()
x <- rnorm(10)
y <- rnorm(20)
z <- rnorm(30)
Example of using get() :
objetos <- ls()
objetos[1]
# [1] "a"
get(objetos[1])
#[1] 1.5730920 -0.1325966 0.1462377 -0.8567735 1.2704741 -0.4335724
#[7] -1.0765247 0.6400620 0.2772769 0.3432856
For all environment objects in a list:
obj <- ls()
lista = as.list(sapply(obj, get))