Transform an atomic vector to list (inverse of purrr::simplify())-CodePudding

TLDR: I need a simple way to transform c(a = 1, a = 3, a = 6) into list(c(a = 1), c(a = 3), c(a = 6)).

Longer version: I am using the function purrr::accumulate(), where the output of each element is an atomic vector of length greater or equal to one. When the length is one, purrr::accumulate() simplifies the whole output to an atomic vector, instead of a list.

Is there a simple way to undo or avoid this? Unfortunately, as.list() does not give me what I want.

Simple example to illustrate:

purrr::accumulate(2:3, ` `, .init = c(a=1, b=2))

gives me

list(c(a = 1, b = 2), c(a = 3, b = 4), c(a = 6, b = 7))

as expected. However,

purrr::accumulate(2:3, ` `, .init = c(a=1))

gives me

c(a = 1, a = 3, a = 6)

when I instead want

list(c(a = 1), c(a = 3), c(a = 6))

CodePudding user response：

You could try

c(a = 1, a = 3, a = 6) %>% map(~setNames(.x, nm = "a")) 

$a
a 
1 

$a
a 
3 

$a
a 
6

or you can also remove the list names with set_names()

c(a = 1, a = 3, a = 6) %>% map(~setNames(.x, nm = "a")) %>% 
  set_names("")

[[1]]
a 
1 

[[2]]
a 
3 

[[3]]
a 
6